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Macro-Tech 2400 Amplifier Service Manual
POWER AMPLIFIER
SERVICE MANUAL
MACRO-TECH -2400
®
©1996 by CROWN INTERNATIONAL, INC.
Mailing Address: P.O. Box 1000 Elkhart, IN U.S.A. 46515-1000 Shipping Address: 57620 C.R. 105 Elkhart, IN U.S.A. 46517
Macro-Tech®, ODEP® and Crown® are registered trademarks of Crown International, Inc. K-SVCMA24 3-96
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Macro-Tech 2400 Amplifier Service Manual The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the scope of this manual, please contact the Crown Technical Support Group. Mail: P.O. Box 1000 Elkhart IN 46515-1000 Shipping: 57620 C.R. 105 Elkhart IN 46517 Phone: (800) 342-6939/(219) 294-8200 FAX: (219) 294-8301
CAUTION
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DISCONNECT POWER CORD BEFORE REMOVING REAR INPUT MODULE TO ACCESS GAIN SWITCH.
AVIS
À PRÉVENIR LE CHOC ÉLECTRIQUE N'ENLEVEZ PAS LES COUVERTURES. RIEN DES PARTIES UTILES À L'INTÉRIEUR. DÉBRANCHER LA BORNE AVANT D'OUVRIR LA MODULE EN ARRIÈRE.
WARNING
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE!
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Macro-Tech 2400 Amplifier Service Manual
Table of Contents
Introduction ............................................................. 4 Parts Information ..................................................... 5 Specifications .......................................................... 6 Voltage Conversion ................................................. 7 Circuit Theory .......................................................... 8 Electrical Checkout Procedures ............................ 13 Parts List (Non-Module) ........................................ 17 Module and Schematic Information ...................... 20 Fuse Module Parts List .......................................... 21 Q42742-9 Display Module Parts List ..................... 22 Q42875-7 Display Module Parts List ..................... 23 Q43442-5 Display Module Parts List ..................... 24 Q42670-2 Output Module Parts List ..................... 25 Q42887-2 Output Module Parts List ..................... 26 Q42985-4 Output Module Parts List ..................... 27 Q43194-2 Output Module Parts List ..................... 28 Q43358-3 Output Module Parts List ..................... 29 Q42667-8 Main Module Parts List ......................... 30 Q42737-9 Main Module Parts List ......................... 33 Q42753-6 Main Module Parts List ......................... 36 Q42777-5 Main Module Parts List ......................... 39 Q42982-1 Main Module Parts List ......................... 42 Q43037-3 Main Module Parts List ......................... 45 Q43132-2 Main Module Parts List ......................... 48 Q43272-6 Main Module Parts List ......................... 51 Q43257-7 Main Module Parts List ......................... 54
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Macro-Tech 2400 Amplifier Service Manual
Introduction
This manual contains service information on Crown power amplifiers. It is designed to be used in conjunction with the applicable Owner's Manual. However, some important information is duplicated in this Service Manual in case the Owner's Manual is not readily available. NOTE: THE INFORMATION IN THIS MANUAL IS INTENDED FOR USE BY AN EXPERIENCED TECHNICIAN ONLY! circuit board may be built up with different parts to create different modules. Note that Crown does not sell blank (unpopulated) circuit boards. Each of the compact audio power amplifiers are designed for professional or commercial use. Providing high power amplification from 20Hz to 20KHz with minimum distortion, they feature balanced inputs with bridged and parallel monophonic capability. Specific features vary depending on model family.
Scope
This Service Manual in intended to apply to all versions of the MA-2400 amplifier including the Amcron MA2401. The Parts Listings include parts specific for the US version and the European version (MA-2400E13). For parts specific only to other versions contact the Crown Technical Support Group for help in finding part numbers. This Service Manual includes several sections. These sections include Parts Information, Specifications, Voltage Conversion, Circuit Theory, Electrical Test Procedures, Non-Module Parts Lists, and Module Parts Lists. Schematics are attached. Note that component parts with circuit board comprise a complete module. Module part numbers are always associated with a specific circuit board, although an unpopulated
Warranty
Each Owner's Manual contains basic policies as related to the customer. In addition it should be stated that this service documentation is meant to be used only by properly trained service personnel. Because most Crown products carry a 3 Year Full Warranty (including round trip shipping within the United States), all warranty service should be referred to the Crown Factory or Authorized Warranty Service Center. See the applicable Owner's Manual for warranty details. To find the location of the nearest Authorized Service Center or obtain instructions for receiving Crown Factory Service please contact the Crown Technical Support Group (within North America) or your Crown/ Amcron Importer (outside North America).
Crown
Technical Support Group Factory Service Parts Department Mailing Address: PO Box 1000 Elkhart, IN USA 46515-1000 Shipping Address: 57620 C.R. 105 Elkhart, IN USA 46517 Phone: (219) 294-8200 Toll Free: (800) 342-6939 FAX: (219) 294-8301
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Macro-Tech 2400 Amplifier Service Manual
Parts Information
General Information
Later sections include both mechanical and electrical parts lists for this product. The parts listed are current as of the date printed. Crown reserves the right to modify and improve its products for the benefit of its customers. shipment on a C.O.D. or pre-payment (check or credit card) basis.
Terms
Normal terms are pre-paid. Net-30 Days applies to only those firms having pre-established accounts with Crown. If pre-paying, the order must be packed and weighed before a total bill can be established, after which an amount due will be issued and shipment made upon receipt of pre-payment. New parts returned for credit are subject to a 10% re-stocking fee, and authorization from the Crown Parts Department must be obtained before returning parts for credit. Crown is not a general parts warehouse. Parts sold by the Crown Parts Department are solely for servicing Crown/Amcron products. Part prices and availability are subject to change without notice.
Part Numbering Systems
As of the printing of this manual, Crown is using two numbering systems. The elder system always uses eight characters. The first character is a letter. Common letters used are C, D, H, M, P, and Q. The second through sixth characters are numbers. The numbers build sequentially (for each prefix letter) as new parts are added to our parts inventory system. (In some cases there will be a space then a four character number after the prefix letter; the space is considered a character.) The seventh character is usually a hyphen, though it may be a letter to indicate a revision or special note. The last character is called a check-digit, and is useful to Crown for internal tracking. Crown is in the process of converting to a new part number system. Length may vary from eight to twelve characters. There is still a letter prefix, then five numbers. These five numbers identify a type of part. The seventh character is a hyphen. Remaining characters identify the details of the type of part identified by the first part of the number.
Crown
Parts Department Mailing Address: PO Box 1000 Elkhart, IN USA 46515-1000 Shipping Address: 57620 C.R. 105 Elkhart, IN USA 46517 Phone: (219) 294-8210 or: (219) 294-8211 Toll Free: (800) 342-6939 FAX: (219) 294-8301
Standard and Special Parts
Many smaller electrical and electronic parts used by Crown are stocked by and available from electronic supply houses. However, some electronic parts that appear to be standard are actually special. A part ordered from Crown will assure an acceptable replacement. Structural items such as modules and panels are available from Crown only.
Ordering Parts
When ordering parts, be sure to give the product model, and include a description and part number (CPN/DPN) from the parts listing. Price quotes are available on request.
Shipment
Shipment will be normally made by UPS or best other method unless you specify otherwise. Shipments are made to and from Elkhart, Indiana USA, only. Established accounts with Crown will receive shipment freight prepaid and will be billed. All others will receive 5
Macro-Tech 2400 Amplifier Service Manual
Specifications
Unless noted otherwise, all specifications are based on driving an 8 ohm load per channel, both channels driven, the sensitivity switch in the 26dB position, the AC supply is 120VAC at 60Hz. Crown specifications are guaranteed through the warranty period (normally 3 years). Because our testing methods are more stringent than our published specifications, every Crown amplifier will exceed its published specifications. POWER Power 8 Ohm Stereo--520W/Ch 4 Ohm Stereo--800W/Ch 2 Ohm Stereo--1050W/Ch 8 Ohm Bridge Mono--1585W 4 Ohm Bridge Mono--2070W 2 Ohm Parallel Mono--1605W 1 Ohm Parallel Mono--2080W Load Impedances: Rated for 16, 8, 4, 2, and 1 (parallel mono only) Ohm operation; safe with all types of loads, even totally reactive loads. AC Mains: 120VAC at 60 Hz with Nema standard 5-20P 20 Amp grounded connector for North American units; 100VAC, 120VAC, 220VAC, and 240VAC at 50 or 60 Hz when equipped with universal transformers, applicable fan assembly, and other applicable hardware with country specific power cord. PERFORMANCE Frequency Response: ±0.1dB from 20 Hz to 20 kHz at 1 Watt. Phase Response: ±10° from 10 Hz to 20 kHz at 1 Watt. Signal to Noise Ratio: A-weighted, better than 105 dB below full rated output. Better than 100 dB below full rated output from 20 Hz to 20 kHz. Total Harmonic Distortion (THD): <0.05% from 20 Hz to 1 kHz, increasing linearly to 0.1% at 20 kHz at 500W. I.M. Distortion: <0.05% from less than 164 milliwatts to 520 W at 26 dB gain. Slew Rate: >13V per microsecond. (Slew rates are limited to useful levels for ultrasonic/RF protection.) Damping Factor: >1000 from 10 Hz to 400 Hz. DC Offset: <10 millivolts. Input Impedance: Nominally 20K ohms balanced; 10K ohms unbalanced. Output Impedance: <10 milliohms in series with <2 microhenries. Protection Systems: Output Device Emulation Protection (ODEP) limits drive in the event of dangerous dynamic thermal conditions without interrupting power. Current limiting for shorted load protection. DC/LF and common mode output current Fault circuitry to mute audio. Delay of 4 seconds from turn on mutes amplifier to prevent dangerous turn-on transients. A high voltage fuse in each main transformer primary and a low voltage power supply fuse in fan primary. Slew rate limiting to prevent RF burn out. MECHANICAL Input Connectors: Balanced 1/4 inch phone jacks. Balanced female XLR connector for each channel on the standard P.I.P.-FX module. Output Connectors: Color-coded 5-way binding posts on 3/4 inch centers; spaced 3/4 inch apart. Front Panel Controls: A front panel push button switch used to power the amplifier on and off. A detented front panel rotary potentiometer for each channel used to control the output level. Back Panel Controls: A three-position switch which selects Stereo, Bridge-Mono, or Parallel-Mono mode. A ground lift switch used to isolate the phone jack input grounds from the chassis (AC) ground. Internal Controls: A three-position switch located inside the P.I.P compartment selects 0.775V, 1.4V, or 26 dB voltage gain input sensitivity. Indicators: Amber Enable indicator shows on/off status of low-voltage power supply. An Amber ODEP indicator for each channel shows the reserve energy status. If no reserve energy is available the indicator will dim in proportion to ODEP limiting. A green SIGNAL/IOC two function indicator for each channel flashes to show that there is amplifier output. The indicator flashes with brighter intensity if the amplifier causes any distortion of 0.05% or more. Construction: Black splatter-coat steel chassis with specially designed flow-through ventilation system. Mounting: Standard EIA 310 front-panel rack mount with supports for supplemental rear corner mounting. Dimensions: 19 inches wide, 3.5 inches high, 16 inches deep behind front mounting surface. Weight: 51 lbs, 12 oz (23.5 kg). Shipping; 65 lbs (29.5 kg).
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Macro-Tech 2400 Amplifier Service Manual
Voltage Conversion
The 120 Volt 60 Hz version, sold in the United States, is not voltage selectable. It does not have voltage selection boards. This version is to be used only with 120 Volts, 60Hz. All other versions of the Macro Tech 2400 use voltage selection boards. The following chart indicates which jumpers are used for different voltages. Note that the fuses and transmotor may need to be changed to accommodate different voltages. Versions with the voltage selection boards may be used at 50 or 60 Hz.
VOLTAGE SELECTION BOARD
100V ORG--B B--E BLU--F C--F 120V ORG--A A--D BLU--F C--F 200V ORG--B C--E BLU--F 220V/230V ORG--B C--D BLU--F 240V ORG--A C--D BLU--F
Jumpers
Circuit Breakers CB100/CB200 Fuse F1 Transmotor TF1
C10169-8 15 Amp A10285-10 1 Amp H42999-5 H42929-2
C10171-4 8 Amp A10285-7 .5 Amp H42928-4
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Macro-Tech 2400 Amplifier Service Manual
Theory
Overview
It should be noted that over time Crown makes improvements and changes to their products for various reasons. This manual is up to date as of the time of writing. For additional information regarding these amplifiers, refer to the applicable Technical Notes provided by Crown for this product. This section of the manual explains the general operation of a typical Crown power amplifier. Topics covered include Front End, Grounded Bridge, and ODEP. Due to variations in design from vintage to vintage (and similarities with other Crown products) the theory of operation remains simplified. indicator for each channel which indicates signal output and distortion. In general, the packaging of this model is designed for maximum watt/price/weight/ size value with user friendly features. For additional details refer to the specification section, or to the applicable Owner's Manual.
Front End Operation
The front end is comprised of three stages: Balanced Gain Stage (BGS), Variable Gain Stage (VGS), and the Error Amp. Figure 1 shows a simplified diagram of a typical front end with voltage amplification stages. Balanced Gain Stage (BGS) Input to the amplifier is balanced. The shield may be isolated from chassis ground by an RC network to interrupt ground loops via the Ground Lift Switch. The non-inverting (hot) side of the balanced input is fed to the non-inverting input of the first op-amp stage. The inverting (negative) side of the balanced input is fed to the inverting input of the first op-amp stage. A potentiometer is provided for common mode rejection adjustment. Electrically, the BGS is at unity gain. (From an audio perspective, however, this stage actually provides +6dB gain if a fully balanced signal is placed on its input.) The BGS is a non-inverting stage. It's output is delivered to the Variable Gain Stage. Variable Gain Stage (VGS) From the output of the BGS, the signal goes to the VGS where gain is determined by the position of the Sensitivity Switch, and level is determined by the level control. VGS is an inverting stage with the input being fed to its op-amp stage. Because gain after this stage is fixed at 26dB (factor of 20), greater amplifier sensitivity is achieved by controlling the ratio of feedback to input resistance. The Sensitivity Switch sets the input impedance to this stage and varies the gain such that the overall amplifier gain is 26 dB, or is adjusted appropriately for 0.775V or 1.4V input to attain rated output. Error Amp The inverted output from the VGS is fed to the noninverting input of the Error Amp op-amp stage through an AC coupling capacitor and input resistor. Amplifier output is fed back via the negative feedback (NFb) loop resistor. The ratio of feedback resistor to input resistor fixes gain from the Error Amp input to the output of the amplifier at 26 dB. Diodes prevent
Features
Macro Tech amplifiers utilize numerous Crown innovations including grounded bridge and ODEP technologies. Cooling techniques make use of the what is essentially air conditioner technology. Air flows bottom to top, and front to side. Air flows a short distance across a wide heatsink. This type of air flow provides significantly better cooling than the "wind tunnel" technology used by many other manufacturers. Output transistors are of the metal can type rather than plastic case. This allows for a significantly higher thermal margin for the given voltage and current ratings. All devices used are tested and graded to ensure maximum reliability. Another electronic technique used is negative feedback. Almost all power amplifiers utilize negative feedback to control gain and provide stability, but Crown uses multiple nested feedback loops for maximum stability and greatly improved damping. Most Crown amplifiers have damping in excess of 1000 in the bass frequency range. This feedback, along with our compensation and ultra-low distortion output topology, make Crown amplifiers superior. Features specific to the Macro Tech Series' include two seperate power transformers (one for each channel), a full time full speed fan which also serves as the low voltage transformer, slew rate limiting, and audio muting for delay or protective action. This amplifier can operate in either a Bridged or Parallel Mono mode as well as dual (stereo). A sensitivity switch allows selection of input voltage required for rated output. Level controls are mounted on the front panel and are of the rotary type. Front panel indicators let the user know the status of the low voltage power supply (enable), an ODEP indicator for each channel which shows the reserve energy status, and a SPI/IOC 8
Macro-Tech 2400 Amplifier Service Manual
Theory
overdriving the Error Amp. Because the Error Amp amplifies the difference between input and output signals, any difference in the two waveforms will produce a near open loop gain condition which in turn results in high peak output voltage. The output of the Error Amp, called the Error Signal (ES) drives the Voltage Translators. limiting transistors and control/protection transistors. The ODEP transistors steal drive as dictated by the ODEP circuitry (discussed later). The control/protection transistors act as switches to totally shunt audio to ground during the turn-on delay, or during a DC/LF or Fault protective action. Last Voltage Amplifiers (LVAs) The Voltage Translator stage channels the signal to the Last Voltage Amplifiers (LVA's) in a balanced configuration. The +LVA and -LVA, with their push-pull effect through the Bias Servo, drive the fully complementary output stage. The LVAs are configured as common emitter amplifiers. This configuration provides sufficient voltage gain and inverts the audio. The polarity inversion is necessary to avoid an overall polarity inversion from input jack to output jack, and it allows the NFb loop to control Error Amp gain by feeding back to its non-inverting input (with its polarity opposite to the output of the VGS). With the added voltage swing provided by the LVAs, the signal then gains current amplification through the Darlington emitter-follower output stage.
Voltage Amplification
The Voltage Translator stage separates the output of the Error Amp into balanced positive and negative drive voltages for the Last Voltage Amplifiers (LVAs), translating the signal from ground referenced ±15V to ±Vcc reference. LVAs provide the main voltage amplification and drive the High Side output stages. Gain from Voltage Translator input to amplifier output is a factor of 25.2. Voltage Translators A voltage divider network splits the Error Signal (ES) into positive and negative drive signals for the balanced voltage translator stage. These offset reference voltages drive the input to the Voltage Translator transistors. A nested NFb loop from the output of the amplifier mixes with the inverted signal riding on the offset references. This negative feedback fixes gain at the offset reference points (and the output of the Error Amp) at a factor of -25.2 with respect to the amplifier output. The Voltage Translators are arranged in a common base configuration for non-inverting voltage gain with equal gain. They shift the audio from the ±15V reference to VCC reference. Their outputs drive their respective LVA. Also tied into the Voltage Translator inputs are ODEP
Grounded Bridge Topology
Figure 2 is a simplified example of the grounded bridge output topology. It consists of four quadrants of three deep Darlington (composite) emitter-follower stages per channel: one NPN and one PNP on the High Side of the bridge (driving the load), and one NPN and one PNP on the Low Side of the bridge (controlling the ground reference for the rails). The output stages are biased to operate class AB+B for ultra low distortion in the signal zero-crossing region and high efficiency.
+15V
BGS
VGS
Voltage Divider
Error Amp
Voltage Translators
Q100 Q121 Q101 Q102 Q103 Q122
+VCC
Q105
Audio Inputs
+ -
+ -
+ -
NPN Outputs (+HS) PNP Outputs (-HS)
Q110
-15V
ODEP
-+
Mute NFb Loop
-VCC
LVA's
Figure 1. Typical Amplifier Front End and Voltage Amplification Stages. 9
Macro-Tech 2400 Amplifier Service Manual
Theory
High Side (HS) The High Side (HS) of the bridge operates much like a conventional bipolar push-pull output configuration. As the input drive voltage becomes more positive, the HS NPN conducts and delivers positive voltage to the load. Eventually the NPN devices reach full conduction and +Vcc is across the load. At this time the HS PNP is biased off. When the drive signal is negative going, the HS PNP conducts to deliver -Vcc to the load and the HS NPN stage is off. The output of the +LVA drives the base of predriver device. Together, the predriver and driver form the first two parts of the three-deep Darlington and are biased class AB. They provide output drive through the bias resistor, bypassing the output devices, at levels below about 100mW. An RLC network between the predriver and driver provide phase shift compensation and limit driver base current to safe levels. Output devices are biased class B, just below cutoff. At about 100mW output they switch on to conduct high current to the load. Together with predriver and driver, the output device provide an overall class AB+B output. The negative half of the HS is almost identical to the positive half, except that the devices are PNP. One difference is that the PNP bias resistor is slightly greater in value so that PNP output devices run closer to the cutoff level under static (no signal) conditions. This is because PNP devices require greater drive current. HS bias is regulated by Q18, the Bias Servo. Q18 is a Vbe multiplier which maintains approximately 3.3V Vce under static conditions. The positive and negative halves of the HS output are in parallel with this 3.3V. With a full base-emitter on voltage drop across predrivers and drivers, the balance of voltage results in approximately .35V drop across the bias resistors in the positive half, and about .5V across the bias resistor in the negative half. Q18 conduction (and thus bias) is adjustable. A diode string prevents excessive charge build up within the high conduction output devices when off. Flyback diodes shunt back-EMF pulses from reactive loads to the power supply to protect output devices from dangerous reverse voltage levels. An output terminating circuit blocks RF on output lines from entering the amplifier through its output connectors. Low Side (LS) The Low Side (LS) operates quite differently. The power supply bridge rectifier is not ground referenced, nor is the secondary of the main transformer. In other words, the high voltage power supply floats with respect to ground, but ±Vcc remain constant with respect to each other. This allows the power supply to
+
+Vcc (Positive Rail)
Input signal
Load (speaker)
Inverting Op-amp LOW SIDE
HIGH SIDE
-Vcc (Negative Rail)
-
Figure 2. Crown Patented Grounded Bridge Topology 10
Macro-Tech 2400 Amplifier Service Manual
Theory
deliver +Vcc and -Vcc from the same bridge rectifier and filter as a total difference in potential, regardless of their voltages with respect to ground. The LS uses inverted feedback from the HS output to control the ground reference for the rails (±Vcc). Both LS quadrants are arranged in a three-deep Darlington and are biased AB+B in the same manner as the HS. When the amplifier output swings positive, the audio is fed to an op-amp stage where it is inverted. This inverted signal is delivered directly to the bases of the positive (NPN) and negative (PNP) LS predrivers. The negative drive forces the LS PNP devices on (NPN off). As the PNP devices conduct, Vce of the PNP Darlington drops. With LS device emitters tied to ground, -Vcc is pulled toward ground reference. Since the power supply is not ground referenced (and the total voltage from +Vcc to -Vcc is constant) +Vcc is forced higher above ground potential. This continues until, at the positive amplifier output peak, -Vcc = 0V and +Vcc equals the total power supply potential with a positive polarity. If, for example, the power supply produced a total of 70V from rail to rail (±35VDC measured from ground with no signal), the amplifier output would reach a positive peak of +70V. Conversely, during a negative swing of the HS output where HS PNP devices conduct, the op-amp would output a positive voltage forcing LS NPN devices to conduct. This would result in +Vcc swinging toward ground potential and -Vcc further from ground potential. At the negative amplifier output peak, +Vcc = 0V and -Vcc equals the total power supply potential with a negative polarity. Using the same example as above, a 70V supply would allow a negative output peak of 70V. In summary, a power supply which produces a total of 70VDC rail to rail (or ±35VDC statically) is capable of producing 140V peak-to-peak at the amplifier output when the grounded bridge topology is used. The voltage used in this example are relatively close to the voltages of the PB-1/460CSL. The total effect is to deliver a peak to peak voltage to the speaker load which is twice the voltage produced by the power supply. Benefits include full utilization of the power supply (it conducts current during both halves of the output signal; conventional designs require two power supplies per channel, one positive and one negative), and never exposing any output device to more than half of the peak to peak output voltage (which does occur in conventional designs). Low side bias is established by a diode string which also shunts built up charges on the output devices. Bias is adjustable via potentiometer. Flyback diodes perform the same function as the HS flybacks. The output of the LS is tied directly to chassis ground via ground strap.
Output Device Emulation Protection (ODEP)
To further protect the output stages, a specially developed ODEP circuit is used. It produces a complex analog output signal. This signal is proportional to the always changing safe-operating-area margin of the output transistors. The ODEP signal controls the Voltage Translator stage by removing drive that may exceed the safe-operating-area of the output stage. ODEP senses output current by measuring the voltage dropped across LS emitter resistors. LS NPN current (negative amplifier output) and +Vcc are sensed, then multiplied to obtain a signal proportional to output power. Positive and negative ODEP voltages are adjustable via two potentiometers. Across ±ODEP are a PTC and a thermal sense (current source). The PTC is essentially a cutoff switch that causes hard ODEP limiting if heatsink temperature exceeds a safe maximum, regardless of signal level. The thermal sense causes the differential between +ODEP and ODEP to decrease as heatsink temperature increases. An increase in positive output signal output into a load will result in ODEP voltage dropping; an increase in negative output voltage and current will cause +ODEP voltage to drop. A complex RC network between the ±ODEP circuitry is used to simulate the thermal barriers between the interior of the output device die (immeasurable by normal means) and the time delay from heat generation at the die until heat dissipates to the thermal sensor. The combined effects of thermal history and instantaneous dynamic power level result in an accurate simulation of the actual thermal condition of the output transistors.
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Macro-Tech 2400 Amplifier Service Manual
Theory
+VOLTAGE TRANSLATOR BGS VGS ERROR AMP OUTPUT DEVICE EMULATION PROTECTION
+LVA -1
POSITIVE HIGH SIDE OUTPUT NPN STAGE
BALANCED INPUTS
-1
HIGH SIDE BIAS SERVO
-VOLTAGE TRANSLATOR
-LVA -1
NEGATIVE HIGH SIDE OUTPUT PNP STAGE
MAIN NEGATIVE FEEDBACK (NFb) LOOP
POSITIVE LOW SIDE OUTPUT NPN STAGE -1 LOW SIDE BIAS DIODE STRING NEGATIVE LOW SIDE OUTPUT PNP STAGE
INVERTING BRIDGE BALANCE
Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown)
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Macro-Tech 2400 Amplifier Service Manual
Electrical Checkout Procedures
General Information
The following test procedures are to be used to verify operation of this amplifier. DO NOT connect a load or inject a signal unless directed to do so by the procedure. These tests, though meant for verification and alignment of the amplifier, may also be very helpful in troubleshooting. For best results, tests should be performed in order. All tests assume that AC power is from a regulated 120 VAC source. Test equipment includes an oscilloscope, a DMM, a signal generator, loads, and I.M.D. and T.H.D. noise test equipment. The following list of ODEP bias voltages VS. temperature is based on the use of Main Modules built on any circuit board up to and including the D 7993-5 board. °F °C VODEP V+ODEP 66 18.9 10.31 11.41 68 20.0 10.26 11.36 70 21.1 10.20 11.30 72 22.2 10.14 11.24 74 23.3 10.09 11.19 76 24.4 10.03 11.13 77 25.0 10.00 11.10 78 25.6 9.97 11.07 80 26.7 9.91 11.01 82 27.8 9.86 10.96 84 28.9 9.80 10.90 86 30.0 9.74 10.84 88 31.1 9.69 10.79 90 32.2 9.63 10.73 92 33.3 9.57 10.67 94 34.4 9.51 10.61 The following list of ODEP bias voltages VS. temperature is based on the use of Main Modules built on any circuit board after the D 7993-5 board. °F °C VODEP V+ODEP 66 18.9 10.31 10.31 68 20.0 10.26 10.26 70 21.1 10.20 10.20 72 22.2 10.14 10.14 74 23.3 10.09 10.09 76 24.4 10.03 10.03 77 25.0 10.00 10.00 78 25.6 9.97 9.97 80 26.7 9.91 9.91 82 27.8 9.86 9.86 84 28.9 9.80 9.80 86 30.0 9.74 9.74 88 31.1 9.69 9.69 90 32.2 9.63 9.63 92 33.3 9.57 9.57 94 34.4 9.51 9.51 ODEP Procedure: Measure pin 6 of U100 and, if necessary, adjust R121 to obtain VODEP as specified above. Measure pin 6 of U200 and, if necessary, adjust R221 to obtain VODEP as specified above. +ODEP Procedure: Measure pin 6 of U103 and, if necessary, adjust R132 to obtain V+ODEP as specified above. Measure pin 6 of U203 and, if necessary, adjust R232 to obtain V+ODEP as specified above.
Standard Initial Conditions
Level controls fully clockwise. Stereo/Mono switch in Stereo. Sensitivity switch in 26 dB fixed gain position. It is assumed, in each step, that conditions of the amplifier are per these initial conditions unless otherwise specified.
Test 1: DC Offset
Spec: 0 VDC, ±10 mV. Initial Conditions: Controls per standard, inputs shorted. Procedure: Measure DC voltage at the output connectors (rear panel). There is no adjustment for output offset. If spec is not met, there is an electrical malfunction. Slightly out of spec measurement is usually due to U104/U204 out of tolorance.
Test 2: Output Bias Adjustment
Spec: 300 to 320 mVDC. Initial Conditions: Controls per standard, heatsink temperature less than 40°C. Procedure: Measure DC voltages on the output module across R02, adjust R26 if necessary. Measure DC voltages on the output module across R21, adjust R23 if necessary. Repeat for second channel.
Test 3: ODEP Voltage Adjustment
Spec: Bias Per Chart, ±0.1V DC. Initial Conditions: Controls per standard, heatsink at room temperature 20 to 30°C (68 to 86°F). Note: This adjustment should normally be performed within 2 minutes of turn on from ambient (cold) conditions. If possible measure heatsink temperature, if not measure ambient room temperature. Use this information when referencing the following charts.
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Macro-Tech 2400 Amplifier Service Manual
Electrical Checkout Procedures
Test 4: AC Power Draw
Spec: 100 Watts maximum quiescent. Initial Conditions: Controls per standard. Procedure: With no input signal and no load, measure AC line wattage draw. If current draw is excessive, check for high AC line voltage or high bias voltage.
Test 8: Level Controls
Spec: Level controlled by level controls. Initial Conditions: Controls per standard. Procedure: No Load. Inject a 1 kHz sine wave. With level controls fully clockwise you should see full gain. As controls are rotated counterclockwise, observe similar gain reduction in each channel. When complete, return level controls to fully clockwise position.
Test 5: Common Mode Rejection
Spec at 100 Hz: 70 dB. Spec at 20 kHz: 50 dB. Initial Conditions: Controls per standard. Procedure: No load. Inject a 0 dBu (.775VRMS) 100 Hz sine wave into each channel, one channel at a time, with inverting and non-inverting inputs shorted together. At the output measure less than 44 dBu (4.9mVRMS). Inject a 0 dBu 20 kHz sine wave into each channel, one channel at a time, with inverting and non-inverting inputs shorted together. At the output measure less than 24 dBu (49mVRMS). For Main Modules with board numbers lower than D 7993-5 adjust N100 and N200 to calibrate CMR. For Main Modules with board number D 7993-5 or greater adjust R921 and R1021.
Test 9: Current Limit
Spec: Current Limit at 36 Amps, ±5 Amps Initial Conditions: Controls per standard. Procedure: Load each channel to 1 Ohm. Inject a 1 kHz differentiated (or 10% duty cycle) square wave. See figure 4. Increase output level until current limit occurs. Current limit should occur at 36 ±5 Amps (36 Vpk). Observe clean (no oscillations) current clipping.
In
.047 uF
Out
1K Ohm
Test 6: Voltage Gain
Spec 26dB Gain: Gain of 20.0 ±3%. Spec 0.775V Sensitivity: ±10%. Spec 1.4V Sensitivity: ±10%. Initial Conditions: Controls per standard. Procedure: No load connected. Inject a 0.775 VAC 1 kHz sine wave with the Sensitivity Switch in the 26 dB position. Measure 15.5 VAC ±0.5 VAC at the amplifier output. Inject a 0.775 VAC 1 kHz sine wave with the Sensitivity Switch in the 0.775V position. Measure 64 VAC ±6 VAC at the amplifier output. Inject a 1.4 VAC 1 kHz sine wave with the Sensitivity Switch in the 1.4V position. Measure 64 VAC ±6 VAC at the amplifier output. Return the Sensitivity Switch to the 26 dB position. Figure 4. Differentiator Circuit
Test 10: Slew Rate & 10 kHz Square Wave
Spec: 17 - 25 V/µS. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 10 kHz square wave to obtain 65 volts zero-to-peak at each output. Observe the slope of the square wave. It should typically measure 13 to 15 V/µS. Also, the square wave must not include overshoot, ringing, or any type of oscillation.
Test 11: Crosstalk
Spec: -60dB at 20 kHz. Initial Conditions: Controls per standard. Terminate input of channel not driven with 600 ohms. Procedure: 8 ohm load on each channel. Inject a 20 kHz sine wave into the Channel 1 input and increase output level to 63 VAC. Measure less than 63 mVAC at the output of Channel 2. Inject a 20 kHz sine wave into the Channel 2 input and increase output level to 63 VAC. Measure less than 63 mVAC at the output of Channel 1.
Test 7: Phase Response
Spec: ±10° from 10 Hz to 20 kHz at 1 Watt. Initial Conditions: Controls per standard, 8 ohm load on each channel. Procedure: Inject a 1 kHz sine wave and adjust for 1 Watt output (2.8 VAC). Check input and output signals against each other, input and output signals must be within 10° of each other.
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Macro-Tech 2400 Amplifier Service Manual
Electrical Checkout Procedures
Test 12: Output Power
Spec at 8 Ohm Stereo: >= 520W at 0.1% THD. Spec at 4 Ohm Stereo: >= 800W at 0.1% THD. Spec at 2 Ohm Stereo: >= 1050W at 0.1% THD. International 8 Ohm Stereo: >=510W at 0.1% THD. International 4 Ohm Stereo: >=745W at 0.1% THD. International 2 Ohm Stereo: >=895W at 0.1% THD. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 1 kHz sine wave and measure at least 64.50 VAC at the output of each channel. Load each channel to 4 ohms. Inject a 1 kHz sine wave and measure at least 56.57 VAC. Load each channel to 2 ohms. Inject a 1 kHz sine wave and measure at least 45.82 VAC. All power measurements must be at less than 0.1% THD.
Test 13: Reactive Loads
Spec: No oscillations. Safe with all types of loads. Initial Conditions: Controls per standard. Procedure Capacitive: Load each channel to 8 ohms in parallel with 2 µF. Inject a 20 kHz sine wave with 55 VAC output for 10 seconds. Procedure Inductive: Load each channel to 8 ohms in parallel with 159 µHenries. Inject a 1 kHz sine wave with 35.8 VAC output for 10 seconds. Procedure Torture: Load each channel with the primary (red and black leads) of a DC-300A transformer (D 5781-6). Inject a 15 Hz sine wave at sufficient output level to cause 3 to 5 flyback pulses, for 10 seconds. Procedure Short: Inject a 60 Hz sine wave with a minimum of 5 VAC at the amplilfier output. After establishing signal, short the output for 10 seconds.
Figure 5. ODEP Limiting Wave Form
Test 15: LF Protection
Spec: Amplifier mutes for low frequency. Initial Conditions: Controls per standard. Procedure: No load. Inject a 0.5 Hz 6 volt peak-to-peak square wave, or a 2 Hz 6VAC sine wave into each channel and verify that each channel cycles into mute.
Test 14: ODEP Limiting
Spec: No oscillation on ODEP Limiting wave form; either channel controls limiting in Parallel Mono Mode. Initial Conditions: Controls per standard; rag or other obstruction blocking fan so that it does not turn. Procedure: Load the amplifier to 2 ohms on each channel. Inject a 60 Hz sine wave and adjust for 28 Vrms at the output. After a few minutes observe a wave form similar to Figure 5. Remove the input signal from both channels and allow the amplifier to cool for a few minutes. Switch the amplifier to Parallel Mono and remove the load from Channel 1. Inject the signal into Channel 1 and observe that ODEP limiting occurs at the output of both channels. Remove the load from Channel 2, and install the load on Channel 1. Again, observe that both channels limit. Return all amplifier controls to standard initial conditions. Remove the fan obstruction.
Test 16: Signal to Noise Ratio
Spec: 100 dB below rated 8 ohm power 20 Hz to 20 kHz. 105 dB A-Weighted. Initial Conditions: Controls per standard. Short inputs. Procedure: Load each channel to 8 ohms. Measure less than 645 µV at the output of each channel (20 Hz20 kHz bandpass filter).
Test 17: Turn On Transients
Spec: No dangerous transients. Initial Conditions: Controls per standard. Procedure: From an off condition, turn on the amplifier and monitor the output noise at the time of turn on. Note: Turn on noise may increase significantly if the amplifier is cycled off and on.
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Macro-Tech 2400 Amplifier Service Manual
Electrical Checkout Procedures
Test 18: Turn Off Transients
Spec: No dangerous transients. Initial Conditions: Controls per standard. Procedure: From an on condition, turn off the amplifier and monitor the output noise at the time of turn off. Note: Turn off noise may increase significantly if the amplifier is cycled off and on.
Test 19: Intermodulation Distortion
Spec at 0 dB Output: 0.01%. Spec at 35 dB Output: 0.05%. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a SMPTE standard IM signal (60 Hz and 7 kHz sine wave mixed at 4:1 ratio). Set the 60 Hz portion of the sine wave to 50.8 Volt RMS. Set the 7 kHz portion to 25%. With an IM analyzer measure less than 0.01% IMD. Repeat test at 35 dB (reference 50.8 Volt RMS, 60 Hz portion) and measure less than 0.05% IMD.
Test 20: Clipping
Spec: No protective action during test. Initial Conditions: Controls per standard. Procedure: Load each channel to 8 ohms. Inject a 1 kHz sine wave at each input and drive output 6 dB into clip for 10 seconds. The amplifier should not activate any protective circuits (ODEP, Fault, or LF Protection).
Post Testing
After completion of testing, if all tests are satisfactory, the amplifier controls should be returned to the positions required by customer. If conditions are unknown or unspecified, factory settings are as follows: Level Controls: 9 to 11 O'Clock. Sensitivity Switch: 0.775V U.S., 1.4V International. Stereo/Mono Switch: Stereo. Ground Lift: Lift. Power: Off.
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Macro-Tech 2400 Amplifier Service Manual
Parts List (Non-Module)
Supplimental Items
CPN D 4137-2 C 3342-0 A10087-71012 K80449D2 ITEM Nylon Thumbscrew Washer Feet, Black Self-Stick 10-32 .75 Machine (Rack Screw) MA Series Owners Manual QTY 4 4 4 1
Power Supply
CPN D 6974-6 A10089-11032 A10094-8 A10099-7 A10100-16 A10102-8 A10094-8 A10098-5 C 8752-5 C 9870-4 D 6764-1 D 8438-0 D 8639-3 A10285-10 A10285-7 C10169-8 C10171-4 D 8993-4 D 9017-1 H42875-7 H42928-4 ITEM Insulator, Fuse Board Screw, 10-32 x 2 (for transformers) Washer, #10 Int Star, Zinc (transformers) Shoulder Washer, #10 Nylon (transformers) Washer, 7/16OD x .203ID (transformers) Nut, 10-32 Hex Zinc (transformers) Lockwasher, #10 Internal Tooth Washer, 1/4" Belleville Spring 35A 400V Bridge Rectifier Screw, 10-32 x .38 Washer, Shoulder Bracket, Capacitor 6300uF 150V Electrolytic Capacitor Fuse, 1A (100V-120V) Fuse, .5A (200V-240V) Breaker, 15A (100V-120V) Breaker, 8A (200V-240V) Transformer, Power (120V, 60Hz) Transformer, Power (Universal Volt) Transmotor (120V 60Hz) Transmotor (200V-240V) QTY 1 8 8 8 8 8 4 4 2 4 4 2 2 1 1 2 2 2 2 1 1
Output Assembly (One Per Channel)
CPN A10315-1 C 8187-4 C 8188-2 C 9387-9 C 9491-9 D 7796-2 D 7797-0 D 8197-2 D 8774-8 F12019-0 B 5842-8 C 8813-5 B 5464-1 C 5826-0 ITEM QTY (PER CHANNEL) Screw, 6-32 x .56 Hex Washer Head, Torx 12 NPN Power Transistor 6 PNP Power Transistor 6 Plasti-Rivit, .156 2 Prong Black 2 Screw, 6-32 x .312 Pan Head 27 Sil Pad (between heatsink and chassis) 1 -For units with P10315-3 output boards use D 6280-8 -For units with boards older than P10315-3 use D 6104-0 Pad (between module and chassis) 1 -For units with P10315-3 output boards use C 7597-4 -For units with boards older than P10315-3 use D 7026-4 Paper Shroud, 1.75 x 14.45 1 PTC, 95DegC Cast Alum 1 Heatsink Under Bias Diodes 1 Tubing, #23 TFE (For Q18) Order in Inches MPS8097/MPSA18 (Q18) 1 Tubing, #24 Teflon, Thin Wall (For S100/S200) Order in Inches LM234Z-6 Thermal Sense (S100/S200) 1
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Macro-Tech 2400 Amplifier Service Manual
Parts List (Non-Module)
Output Assembly (cont.)
CPN M21322J8 C 8573-5 C 8574-3 D 7665-9 D 7666-7 ITEM Heat Sink with Fins 2SA1186 PNP Driver Transistor 2SC2837 NPN Driver Transistor T03P Mounting Clip T03P Bracket QTY (ONE PER CHANNEL) 2 2 2 2 2
Back Panel Assembly
CPN D 7975-2 A10793-0503G M44018-6 A10086-10410 A10086-11008 A10094-2 A10095-4 A10100-7 A10102-8 C 4508-5 C 6821-0 C 7500-9 C 7705-4 C 8812-7 C10060-9 C10184-7 F11160-3 C10187-0 F12672-6 P10286-6 ITEM Power Cord, 12/3 SO/W-A 20A U.S. Models) Power Cord (European Models) PIP-FX Screw, 4-40 x .62 Screw, 10-32 x .5 Lockwasher, #4 Internal Star Lockwasher, #10 Internal Star Aluminium Spacer, .250OD x .140ID x .312L Nut, 10-32 Hex IC Socket, 16 Pin Edge Card Connector, 22 Contact #10 Flanged Spade Flat Cable Clamp 5.5" Cable Tie Header, 5 Pin R Angle Locking Dual Binding Post Strain Relief, Pwr Cord (U.S. Models) Strain Relief, Pwr Cord (European Models) Back Panel Board, PIP Interconnect QTY 1 1 1 2 1 2 1 2 1 1 1 1 1 2 1 2 1 1 1 1
Chassis Front Assembly
CPN A10086-10824 C10258-9 D 6013-3 D 8048J6 D 8049J4 F12647-8 D 8052J8 A10101-12 A10101-5 A10103-10816 A10173-1 B 5796-6 D 7696-4 D 8752-4 ITEM Screw, 8-32 x 1.50 RDHD PH (for handles) Screw, 6-32 x .75 FLTHD Pushbutton, .75 Beaded Handle Panel Cap Panel Cap Spacer End Cap Spacer, #8 x 5/16OD x 1/4L Nylon Washer, .5 x .136 x .02 Screw, #8 x 1.00 Flat HD Clip, Filter Grille Velcro Tape, 1/2 x 1/4 Filter, FR Foam .53 x 16.7 Grille Extrusion QTY 4 2 1 2 2 2 2 2 2 2 2 8 2 1
Note: Old style grills with the one piece filter behind the grill are no longer available. If an old amplifer needs a new grill, the only option is to convert it to the new style by ordering part number M46504-3, which includes the bottom cover. New grills will not fit onto old bottom covers.
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Macro-Tech 2400 Amplifier Service Manual
Parts List (Non-Module)
Chassis Front Assembly (Cont.)
CPN A10086-10604 C 6005-0 D 4108-3 D 6265-9 D 7937-2 D 8694J7 F11322-9 ITEM Screw, 6-32 x .25 Set Screw, 6-32 x .18 cup point (for knobs) Collar, .35 Round (for pushbutton switch) Knob Collar, LED Plastic Silver Front Panel Overlay, MA-2400 FP QTY 3 2 1 2 5 1 1
Main Chassis Assembly
CPN A10094-3 A10110-70605 C 6965-5 D 8501-5 A10091-10406 A10092-10607 A10094-4 A10094-6 F12609-8 A10109-10822 A10110-70812 A10192-1 C 1811-6 C 1813-2 C 3163-0 C 6709-7 C 6912-7 C 6913-5 C 6914-3 C 6918-4 C 7265-9 C 7351-7 C 9091-7 C 7134-7 D 7167-6 C 9491-9 C 9592-4 C 9953-8 D 7217-9 D 7784-8 D 8251-7 D 8854-8 H43424-3 C 7062-0 C 9938-9 D 8439-8 ITEM Washer, Black #6 Int Star Screw, 6-32 x .312 Taptite Screw, 6-32 x .156 Top Cover Screw, 4-40 x .37 Flat Head Screw, 6-32 x .437 Socket Head Washer, #6 Int Star, Zinc Washer, #8 Int Star Bottom Cover Screw, 8-18 x 1.375 Screw, 8-32 x .750 Taptite Snap bushing, .500 4" Cable Tie 7.5" Cable Tie & Clamp Solder Lug, #6 Hole Ferrite Bead Tension Retaining Board Supports 1" Spacer Toggle Nut, Plastic .75" Spacer Toggle Nut, Plastic 1" Cable Tie Mount, Adhesive Back Screw, #2 x 3/8 Sheet Metal Connector, 10-12 GA Splice Power Switch, 10A Push Button, SPST Micro Switch --Power Switch for Older Amplifiers Plunger --Used with above Micro Switch Screw, 6-32 x .312 Capacitor, .01uF 250V Film Screw, 6-20 x .312 Insulator, .031 x 1.68 x 1.78 Fiberboard Voltage Gain Label Fuse Replacement Label Jumper, Output Ground to Chassis .75 x 3.5 Slit Tube Screw, 6-32 x 5/16 Flathead (Fan Bracket) Fan Blade Fan Bracket QTY 19 16 4 1 2 3 3 4 1 2 2 4 4 2 1 4 2 2 2 1 2 1 1 1 1 10 1 6 2 1 1 1 2 2 1 1
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Macro-Tech 2400 Amplifier Service Manual
Module and Schematic Information
Module History
Since the introduction of the MA-2400 amplifier there have been several updates and revisions. Some of these changes called for new modules. The following is a list of modules used up to this date, March 1996.
Fuse Module:
Q42742-9 Fuse module on P10202-3 Board. M44161-4 Fuse module on P10387-2 board.
Output Modules: (left and right are identical)
Q42670-2 Original output module on P10233-8. Q42887-2 Output module on P10315-3 board. No longer available. Use Q43065-4 as service replacement. Q42985-4 Output module on P10337-7 board. No longer available. Use Q43358-3 as service replacement. Q43194-2 Output module on P10396-3 board. Q43358-3 Output module on P10433-4 board.
Display Module:
Q42742-9 Display module on D 6260C4 board. Q42875-7 Display module on D 6260C4 board. Q43442-5 Display module on D 8897-7 board.
Schematic Information
The schematics provided are representative only. There may be slight variations between amplifier to amplifier. These schematics are intended to be used for troubleshooting purposes only. For amplifiers with main boards D 6978-7, D 7150-2, or D 7251-8 refer to schematic numbers J0342-6, J0262-6, and display schematic J0242-8. For amplifiers with main boards D 7605-5, or D 79117 refer to schematic number J0449-9. For amplifiers with main boards D 7993-5, or D 82830 refer to schematic number J0531-4. For amplifiers with a main board D 8369-7, refer to schematic number J0625-4.
Main Modules:
Q42667-8 Main module on D 6978-7 board. No longer available. Use Q42777-5 as service replacement. Q42737-9 Main module on D 6978-7 board. No longer available. Use Q42777-5 as service replacement. Q42753-6 Main module on D 7150-2 board. No longer available. Use Q42777-5 as service replacement. Q42777-5 Main module on D 7251-8 board. Used as a replacement for all older modules. Q42982-1 Main module on D 7911-7 board. No longer available use Q43257-7 as service replacement. Q43037-3 Main module on D 7993-5 board. No longer available use Q43257-7 as service replacement. Q43132-2 Main module on D 8283-0 board. Q43272-6 Main module on D 8283-0 board. Q43257-7 Main module on D 8369-7 board.
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Macro-Tech 2400 Amplifier Service Manual
Fuse Module Parts Lists
Q42742-9 Fuse Module
C1, C2 D1, D2 0 Ohm R1, R2 K1, K2 F1 Cable Board C 5234-7 C 3181-2 C 5868-2 A10266-1001 C 7823-5 C 7890-4 C 5060-6 H42918-5 P10202-3 .047µF 125V 1N4148 Diode .25W Jumper 10 Ohm .25W 24V, 30A Relay Relay Cap Fuse Mount Clips Cable 3-Cond. W/Conn. Board P10387-2 H42918-5 3-Cond. W/Conn
M44161-4 Fuse Module
C1, C2 D1, D2 R1, R2 K1, K2 F1 Tabs C 5234-7 C 3181-2 A10266-1001 C 7891-2 C 5060-6 C 7817-7 .047µF 125V 1N4148 Diode 10 Ohm .25W 30A Relay Fuse Mount Clips Faston, PC Mount
Note: F1 Fuse is not included on Module Assemblies. Please See Power Supply Parts List for fuse Part Number.
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Macro-Tech 2400 Amplifier Service Manual
Q42742-9 Display Module (D 6260C4 board) Parts List
Capacitors
C501 C502 C503 C504 C505 C507 C508 C701 C702 C601 C602 C603 C604 C605 C607 C608 C 6802-0 C 6806-1 C 6806-1 C 7353-3 C 5050-7 C 6809-5 C 6807-9 C 6802-0 C 6802-0 .47µF Ax 50V .01µF Ax 100V .01µF Ax 100V .22µF Ax 50V 4.7µF Ax 100V Lytic 220pF Ax 100V .001µF Ax 100V .47µF Ax 50V .47µF Ax 50V R524 R525 R701 R702 R703 R704 R705 R706 R707 R624 R625 A10266-2221 A10266-5631 A10266-1522 A10266-5111 A10266-2231 A10266-1031 A10266-1031 A10266-2231 A10266-5111 2.2K 56K 1.5K .5W 510 22K 10K 10K 22K 510
Diodes
D501 D502 D503 D504 D701 D702 D601 D602 D603 D604 C 3181-2 C 3181-2 C 3181-2 D 7378-9 C 3533-4 C 3533-4 1N4148 1N4148 1N4148 1N966B Lo Noise 1N966B 16V Zener 1N966B 16V Zener
ICs
U501 U502 U503 U601 C 4345-2 C 5070-7 C 4345-2 LM339 TL072 LM339
Misc.
Board J3 J10 Spacer D 6260C4 C 4508-5 C 7526-4 C 4759-7 16 Pin Header 3 Pin Header LED Nylon Spacer
LEDs
E501 E502 E701 E601 E602 C 7863-1 C 4342-9 C 4342-9 Grn SPI/IOC Amber ODEP Amber Enable
Transistors
Q501 Q502 Q503 Q504 Q505 Q506 Q601 Q602 Q603 Q604 Q605 Q606 C 3625-8 D 2961-7 D 2961-7 C 3625-8 D 2961-7 C 3954-2 PNP 2N4125 NPN 2N3859A Sel NPN 2N3859A Sel PNP 2N4125 NPN 2N3859A Sel PNP MPSA56
Resistors
R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R511 R512 R513 R514 R515 R516 R517 R518 22 R601 R602 R603 R604 R605 R606 R607 R608 R609 R610 R611 R612 R613 R614 R615 R616 R617 R618 A10266-1051 A10266-3331 A10266-2741 A10266-1031 A10266-1022 A10266-2222 A10266-1032 A10266-1351 A10266-7551 A10266-4751 A10266-4741 A10266-4731 A10266-1522 A10266-1001 A10266-3351 A10266-4741 A10266-1551 A10266-1031 1M 33K 270K 10K 1K .5W 2.2K .5W 20K .5W 1.3M 7.5M 4.7M 470K 47K 1.5K .5W 10 3.3M 470K 1.5M 10K
Macro-Tech 2400 Amplifier Service Manual
Q42875-7 Display Module (D 6260C4 board) Parts List
Capacitors
C501 C502 C503 C507 C701 C702 C601 C602 C603 C607 C 6802-0 C 6806-1 C 6806-1 C 6809-5 C 6802-0 C 6802-0 .47µF Ax .01µF Ax .01µF Ax 220pF .47µF Ax .47µF Ax
ICs
U501 U502 U601 C 4345-2 C 5070-7 LM339 TL072
Misc.
Board J3 J10 Spacer D 6260C4 C 4508-5 C 7526-4 A10101-2 16 Pin Header 3 Pin Header LED Spacer
Diodes
D501 D502 D503 D701 D702 D601 D602 D603 C 3181-2 C 3181-2 C 3181-2 C 3533-4 C 3533-4 1N4148 1N4148 1N4148 1N966B 16V Zener 1N966B 16V Zener
LEDs
E501 E502 E701 E601 E602 C 7863-1 C 8740-0 C 4342-9 Grn SPI/IOC Amber ODEP Amber Enable
Transistors
Q501 Q502 Q503 Q504 Q506 Q601 Q602 Q603 Q604 Q606 C 3625-8 D 2961-7 D 2961-7 C 3625-8 C 3954-2 PNP 2N4125 NPN 2N3859A Sel NPN 2N3859A Sel PNP 2N4125 PNP MPSA56
Resistors
R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R511 R512 R513 R514 R516 R524 R701 R702 R703 R704 R705 R706 R707 R601 R602 R603 R604 R605 R606 R607 R608 R609 R610 R611 R612 R613 R614 R624 A10266-1051 A10266-3331 A10266-2741 A10266-1031 A10266-1022 A10266-2222 A10266-1032 A10266-1351 A10266-7551 A10266-4751 A10266-4741 A10266-2221 A10266-1522 A10266-1001 A10266-1021 A10266-2221 A10266-1522 A10266-5111 A10266-2231 A10266-1031 A10266-1031 A10266-2231 A10266-5111 1M 33K 270K 10K 1K .5W 2.2K .5W 20K .5W 1.3M 7.5M 4.7M 470K 2.2K 1.5K .5W 10 1K 2.2K 1.5K .5W 510 22K 10K 10K 22K 510 23
Macro-Tech 2400 Amplifier Service Manual
Q43442-5 Display Module (D 8897-7 board) Parts List
Capacitors
C501 C502 C503 C507 C701 C702 C703 C704 C601 C602 C603 C607 C 6802-0 C 6806-1 C 6806-1 C 6809-5 C 6804-6 C 6804-6 C 6804-6 C 6804-6 .47µF Ax .01µF Ax .01µF Ax 220pF .1µF Ax .1µF Ax .1µF Ax .1µF Ax
ICs
U501 U502 U701 U702 U601 C 4345-2 C 5070-7 C 8518-0 C 8519-8 LM339 TL072 MC78L15ACP +15V MC79L15ACP -15V
Misc.
Board J3 J10 Spacer D 8897-7 C 8784-8 C 7526-4 A10101-2 16 Pin Header 3 Pin Header LED Spacer
Diodes
D501 D502 D503 D701 D601 D602 D603 C 3181-2 C 3181-2 C 3181-2 C 8235-1 1N4148 1N4148 1N4148 1N6263
LEDs
E501 E502 E701 E601 E602 C 7863-1 C 4342-9 C 4342-9 Grn SPI/IOC Amber ODEP Amber Enable
Transistors
Q501 Q502 Q503 Q504 Q505 Q601 Q602 Q603 Q604 Q605 C 3625-8 D 2961-7 D 2961-7 C 3625-8 C 3954-2 PNP 2N4125 NPN 2N3859A Sel NPN 2N3859A Sel PNP 2N4125 PNP MPSA56
Resistors
R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R511 R512 R513 R514 R515 R701 R703 R704 R705 R706 R601 R602 R603 R604 R605 R606 R607 R608 R609 R610 R611 R612 R613 R614 R615 A10266-1051 A10266-3331 A10266-2741 A10266-1031 A10266-1022 A10266-2222 A10266-2032 A10266-1351 A10266-7551 A10266-4751 A10266-4741 A10266-2221 A10266-1522 A10266-1001 A10266-2221 A10266-1522 A10266-2031 A10266-1031 A10266-1031 A10266-2031 1M 33K 270K 10K 1K .5W 2.2K .5W 20K .5W 1.3M 7.5M 4.7M 470K 2.2K 1.5K .5W 10 2.2K 1.5K .5W 20K 10K 10K 20K
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Macro-Tech 2400 Amplifier Service Manual
Q42670-2 Output Module (P10233-8 board) Parts List
Capacitors
C01 C02 C03 C04 C05 C06 C07 C08 C09 C 3978-1 C 2938-6 C 2938-6 C 6806-1 C 6806-1 C 6806-1 C 6807-9 C 6810-3 C 6809-5 .047µF .1µF .1µF .01µF .01µF .01µF .001µF 180pF 220pF
Resistors
R00 R01 R02 R03 R04 R05 R06 R07 R08 R09 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30* A10266-4711 A10266-1011 C 7778-1 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 C 7779-9 A10266-1011 C 7317-8 A10266-2R73 A10266-4711 A10266-2R73 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 C 7778-1 C 7779-9 C 6844-2 A10266-1331 A10266-2221 C 6844-2 A10266-3911 A10266-1331 A10266-5101 A10265-10201* 470 100 5.6 .5W Flame Proof .2 5W .2 5W .2 5W .2 5W .2 5W .2 5W 22 .5W Flame Proof 100 2.7 5W 2.7 1W 470 2.7 1W .2 5W .2 5W .2 5W .2 5W .2 5W .2 5W 5.6 .5W Flame Proof 22 .5W Flame Proof 250 Pot LS 13K 2.2K 250 Pot HS 390 13K 51 102*
Diodes
D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2941-0 C 2941-0 C 2941-0 C 2941-0 C 2851-1 C 2851-1 C 2851-1 C 2851-1 1N4004 1N4004 1N4004 1N4004 1N5402 1N5402 1N5402 1N5402 1N4004 1N4004 1N4004 1N4004
Inductors
L00 L01 L02 C 6592-6 C 3510-2 C 3510-2 Output Coil 470µH 470µH
Transistors
Q17 Q19 C 7271-7 C 7318-6 NPN MPSU10 PNP MPSU60
Misc.
Board Jumpers J500 J600 P10233-8 C 5868-2 C 7057-0 0 Ohm (Qty 5) 10 Pin Header
Note: Output Transistors, Driver Transistors, Q18, and S100/200 are not included with the module assembly. Refer to the Output Assembly Parts List on pages 17 and 18 for these part numbers.
*Note: R30 is 102 Ohms in most units, though in some cases a different value may be used to match the installed S100/S200 LM334 (C5826-0) device grade. This is the standard value and is used with the most common LM334 grade, green. If the LM334 is marked with a blue dot, R30 should be a 107 Ohm resistor (A10265-10701); if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001).
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Macro-Tech 2400 Amplifier Service Manual
Q42887-2 Output Module (P10315-3 board) Parts List
Capacitors
C01 C02 C03 C04 C05 C06 C07 C08 C09 C43 C 8511-5 C 8426-6 C 8426-6 C 6806-1 C 6806-1 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 7697-3 .047µF .1µF .1µF .01µF .01µF .01µF .001µF 180pF 220pF .01µF
Resistors
R00 R01 R02 R03 R04 R05 R06 R07 R08 R09 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30* A10266-4711 A10266-1011 C 7778-1 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 C 7779-9 A10266-1011 C 7317-8 A10266-2R73 A10266-4711 A10266-2R73 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 D 6486-2 C 7778-1 C 7779-9 C 6844-2 A10266-1331 A10266-2221 C 6844-2 A10266-3911 A10266-1331 A10266-5101 A10265-10201* 470 100 5.6 .5W Flame Proof .2 5W .2 5W .2 5W .2 5W .2 5W .2 5W 22 .5W Flame Proof 100 2.7 5W 2.7 1W 470 2.7 1W .2 5W .2 5W .2 5W .2 5W .2 5W .2 5W 5.6 .5W Flame Proof 22 .5W Flame Proof 250 Pot LS 13K 2.2K 250 Pot HS 390 13K 51 102*
Diodes
D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2941-0 C 2941-0 C 2941-0 C 2941-0 C 2851-1 C 2851-1 C 2851-1 C 2851-1 1N4004 1N4004 1N4004 1N4004 1N5402 1N5402 1N5402 1N5402 1N4004 1N4004 1N4004 1N4004
Inductors
L00 L01 L02 C 6592-6 C 3510-2 C 3510-2 Output Coil 470µH 470µH
Transistors
Q17 Q19 C 8508-1 C 8509-9 NPN 2SC3298B PNP 2SA1306B
Misc.
Board Jumpers Clips J500 J600 P10315-3 C 5868-2 D 6414-3 C 7057-0 0 Ohm (Qty 6) Q17/Q19 10 Pin Header
Note: Output Transistors, Driver Transistors, Q18, and S100/200 are not included with the module assembly. Refer to the Output Assembly Parts List on pages 17 and 18 for these part numbers.
*Note: R30 is 102 Ohms in most units, though in some cases a different value may be used to match the installed S100/S200 LM334 (C5826-0) device grade. This is the standard value and is used with the most common LM334 grade, green. If the LM334 is marked with a blue dot, R30 should be a 107 Ohm resistor (A10265-10701); if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001).
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Macro-Tech 2400 Amplifier Service Manual
Q42985-4 Output Module (P10337-7 board) Parts List
Capacitors
C01 C02 C03 C04 C05 C06 C07 C08 C09 C43 C 8511-5 C 8426-6 C 8426-6 C 6806-1 C 6806-1 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 7697-3 .047µF 250V Ax .1µF .1µF .01µF 100V Ax .01µF 100V Ax .01µF 100V Ax .001µF 100V Ax 180pF 220pF .01µF Disc
Resistors
R00 R01 R02 R03 R04 R05 R06 R07 R08 R09 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30* A10266-7501 75 A10266-1011 100 C 7778-1 5.6 .5W Flame Proof C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 7779-9 22 .5W Flame Proof A10266-1011 100 C 7317-8 2.7 5W A10266-2R73 2.7 1W A10266-7501 75 A10266-2R73 2.7 1W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 7778-1 5.6 .5W Flame Proof C 7779-9 22 .5W Flame Proof C 6844-2 250 Pot LS Bias A10266-1331 13K A10266-2221 2.2K C 6844-2 250 Pot HS Bias A10266-3911 390 A10266-1331 13K A10266-5101 51 A10265-10201* 102* 1%
Diodes
D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2941-0 C 2941-0 C 2941-0 C 2941-0 C 2851-1 C 2851-1 C 2851-1 C 2851-1 1N4004 1N4004 1N4004 1N4004 1N5402 1N5402 1N5402 1N5402 1N4004 1N4004 1N4004 1N4004
Inductors
L00 L01 L02 C 6592-6 C 3510-2 C 3510-2 1.3µH Output Coil 470µH 470µH
Transistors
Q17 Q19 C 8508-1 C 8509-9 NPN 2SC3298B PNP 2SA1306B
Misc.
Board Z1-Z9 Clips J500 J600 P10337-7 C 5868-2 D 6414-3 C 7057-0 0 Ohm Jumper Q17/Q19 Hold Down 10 Pin Header
Note: Output Transistors, Driver Transistors, Q18, and S100/200 are not included with the module assembly. Refer to the Output Assembly Parts List on pages 17 and 18 for these part numbers.
*Note: R30 is 102 Ohms in most units, though in some cases a different value may be used to match the installed S100/S200 LM334 (C5826-0) device grade. This is the standard value and is used with the most common LM334 grade, green. If the LM334 is marked with a blue dot, R30 should be a 107 Ohm resistor (A10265-10701); if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001).
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Macro-Tech 2400 Amplifier Service Manual
Q43194-2 Output Module (P10396-3 board) Parts List
Capacitors
C01 C02 C03 C04 C05 C06 C07 C08 C09 C43 C 8511-5 C 8426-6 C 8426-6 C 6806-1 C 6806-1 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 7697-3 .047µF 250V Ax .1µF .1µF .01µF 100V Ax .01µF 100V Ax .01µF 100V Ax .001µF 100V Ax 180pF 220pF .01µF Disc
Resistors
R00 R01 R02 R03 R04 R05 R06 R07 R08 R09 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30* A10266-7501 75 A10266-1011 100 C 7778-1 5.6 .5W Flame Proof C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 7779-9 22 .5W Flame Proof A10266-1011 100 C 7317-8 2.7 5W A10266-2R73 2.7 1W A10266-7501 75 A10266-2R73 2.7 1W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 6486-2 .2 5W C 7778-1 5.6 .5W Flame Proof C 7779-9 22 .5W Flame Proof C 6844-2 250 Pot LS Bias A10266-1331 13K A10266-2221 2.2K C 6844-2 250 Pot HS Bias A10266-3911 390 A10266-1331 13K A10266-5101 51 A10265-10201* 102* 1%
Diodes
D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2941-0 C 2941-0 C 2941-0 C 2941-0 C 2851-1 C 2851-1 C 2851-1 C 2851-1 1N4004 1N4004 1N4004 1N4004 1N5402 1N5402 1N5402 1N5402 1N4004 1N4004 1N4004 1N4004
Inductors
L00 L01 L02 C 6592-6 C 3510-2 C 3510-2 1.3µH Output Coil 470µH 470µH
Transistors
Q17 Q19 C 8508-1 C 8509-9 NPN 2SC3298B PNP 2SA1306B
Misc.
Board Z1-Z7, Z9 Z8 Clips J500 J600 P10396-3 C 5868-2 A10124-24 D 6414-3 C 7057-0 0 Ohm Jumper Solid Wire Q17/Q19 Hold Down 10 Pin Header
Note: Output Transistors, Driver Transistors, Q18, and S100/200 are not included with the module assembly. Refer to the Output Assembly Parts List on pages 17 and 18 for these part numbers.
*Note: R30 is 102 Ohms in most units, though in some cases a different value may be used to match the installed S100/S200 LM334 (C5826-0) device grade. This is the standard value and is used with the most common LM334 grade, green. If the LM334 is marked with a blue dot, R30 should be a 107 Ohm resistor (A10265-10701); if it is marked with a yellow dot then R30 should be a 100 Ohm resistor (A10265-10001).
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Macro-Tech 2400 Amplifier Service Manual
Q43358-3 Output Module (P10433-4 board) Parts List
Capacitors
C01 C02 C03 C04 C05 C06 C07 C08 C09 C43 A10434-437JD C 8426-6 C 8426-6 C 6806-1 C 6806-1 C 6806-1 C 6807-9 C 6810-3 C 6809-5 C 7697-3 .047µF 250V .1µF .1µF .01µF 100V Ax .01µF 100V Ax .01µF 100V Ax .001µF 100V Ax 180pF 220pF .01µF Disc
Resistors
R00 R01 R02 R03 R04 R05 R06 R07 R08 R09 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R41 R42 R43 R44 R45 R46 A10266-7501 A10266-1011 C 7778-1 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7779-9 A10266-1011 C 7317-8 A10266-2R74 A10266-7501 A10266-2R74 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 6486-2 C 7778-1 C 7779-9 C 6844-2 A10266-1331 A10266-2221 C 6844-2 A10266-3911 A10266-1331 A10266-5101 A10265-10201 A10266-5R61 A10266-5R61 A10266-5R61 A10266-5R61 A10266-5R61 A10266-5R61 75 100 5.6 .5W Flame Proof .2 5W .2 5W .2 5W .2 5W .2 5W .2 5W 22 .5W Flame Proof 100 2.7 5W 2.7 2W 75 2.7 2W .2 5W .2 5W .2 5W .2 5W .2 5W .2 5W 5.6 .5W Flame Proof 22 .5W Flame Proof 250 Pot LS Bias 13K 2.2K 250 Pot HS Bias 390 13K 51 102 1% 5.6 5.6 5.6 5.6 5.6 5.6
Diodes
D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 D11 D12 C 2851-1 C 2851-1 C 2851-1 C 2851-1 C 2941-0 C 2941-0 C 2941-0 C 2941-0 C 2851-1 C 2851-1 C 2851-1 C 2851-1 1N4004 1N4004 1N4004 1N4004 1N5402 1N5402 1N5402 1N5402 1N4004 1N4004 1N4004 1N4004
Inductors
L00 L01 L02 C 6592-6 C 3510-2 C 3510-2 1.3µH Output Coil 470µH 470µH
Transistors
Q17 Q19 C 8508-1 C 8509-9 NPN 2SC3298B PNP 2SA1306B
Note: Output Transistors, Driver Transistors, Q18, and S100/200 are not included with the module assembly. Refer to the Output Assembly Parts List on pages 17 and 18 for these part numbers.
Misc.
Board P10433-4 Z1-Z7, Z9-Z12 C 5868-2 Z8 A10124-24 Clips D 6414-3 P500 P600 C 7057-0 0 Ohm Jumper Solid Wire Q17/Q19 Hold Down 10 Pin Header
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Macro-Tech 2400 Amplifier Service Manual
Q42667-8 Main Module (D 6978-7 board) Parts List
Capacitors
C1 C2 C3 C4 C5 C6 C7 C100 C101 C103 C104 C105 C106 C108 C112 C113 C114 C115 C116 C117 C118 C122 C124 C125 C127 C128 C130 C133 C134 C135 C136 C137 C138 C139 C140 C141 C144 C145 C146 C147 C148 C 149 C152 C153 C 4303-1 C 3913-8 C 4303-1 C 6802-0 C 6806-1 C 6806-1 C 6094-9 C 5053-1 C 2821-4 C 6805-3 C 6804-6 C 6950-7 C 6950-7 C 6812-9 C 6803-8 C 6802-0 C 3729-8 C 3729-8 C 6802-0 C 6803-8 C 6812-9 C 6811