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ORDER NO. MD0803003CE
CD Stereo System
SA-AK270EB SA-AK270EG
Colour (K)... Black Type
Notes: This model's CD mechanism changer unit is CRS1. Please refer to the original Service Manual (Order No. MD0509368C0) for this mechanism.
Specifications
s AMPLIFIER SECTION RMS output power stereo mode THD 10%, both channels driven 1 kHz Total RMS stereo mode power s FM/AM TUNER, TERMINALS SECTION Preset station FM 25 stations AM 15 stations Frequency Modulation (FM) Frequency range 87.50 to 108.00 MHz (50 kHz steps) Antenna terminal(s) Amplitude Modulation (AM) Frequency range Music Port (front) jack Sensitivity Terminal Headphone jack Terminal Output impedance s CASSETTE DECK SECTION Type Track system Heads © 2008 Matsushita Electric Industrial Co. Ltd.. All rights reserved. Unauthorized copying and distribution is a violation of law. 1 way 4 track, 2 channel Stereo, 3.5 mm jack 32 (Max) 100 mV, 4.0 k Stereo, 3.5 mm jack 522 to 1629 kHz (9 kHz step) 75 (unbalanced) s DISC SECTION Disc played [8 cm or 12 cm] (1) CD-Audio (CD-DA) (2) CD-R/RW (CD-DA, MP3* formatted disc) (3) MP3* * MPEG-1 Layer 3, MPEG-2 Layer 3 Pick up Wavelength Beam Source Audio output (Disc) Number of channels 2 (FL, FR) 780 nm Semiconductor laser 125 W per channel (3 ) 250 W Record/playback Erasure Motor Recording system Erase system Tape speed Overall frequency response (+3, -6 dB) at DECK OUT NORMAL S/N ratio Wow and flutter Fast forward and rewind time Approx. 120 seconds with C-60 cassette tape 35 Hz to 14 kHz 50 dB (A weighted) 0.18 % (WRMS) Solid permalloy head Double gap ferrite head DC servo motor AC bias 100 kHz AC erase 100 kHz 4.8 cm/s
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s USB SECTION USB Port USB Standard Media file format support MP3 (*.mp3) USB device file system FAT 12 FAT 16 FAT 32 USB port power s GENERAL Power supply AC 230 to 240 V, 50Hz Power consumption Dimensions (W x H x D) Mass 65 W 250 x 331 x 342 mm 4.7 kg 500 mA (Max) USB 2.0 full speed
Operating temperature range Operating humidity range Power consumption mode s SYSTEM SC-AK270 (EB) in standby
0 to 40°C 35% to 80% RH (no condensation) 0.4 W
Music center: SA-AK270 (EB) Speaker: SB-AK270 (PL)
SC-AK270 (EG)
Music center: SA-AK270 (EG) Speaker: SB-AK270 (PL)
For information on speaker system, please refer to the original Service Manual (Order No. MD0802018CE) for SB-AK270PL-K. Notes: 1. Specifications are subject to change without notice. Mass and dimensions are approximate. 2. Total harmonic distortion is measured by the digital spectrum analyzer.
CONTENTS
Page
1 Safety Precautions 2 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices 3 Handling Precautions For Traverse Unit 4 Precaution of Laser Diode 5 About Lead Free Solder (PbF) 6 Operation Procedures 7 New Features 8 Self diagnosis and special mode setting 9 Assembling and Disassembling 10 Service Fixture and Tools 11 Service Positions 6 7 9 10 11 14 16 25 54 54 3
Page
12 Procedure for Checking Operation of Individual Parts of Deck Mechanism Unit 13 Measurement And Adjustments 14 Voltage Measurement and Waveform Chart 15 Wiring Connection Diagram 16 Block Diagram 17 Notes Of Schematic Diagram 18 Schematic Diagram 19 Printed Circuit Board 20 Illustration of ICs, Transistors and Diodes 21 Terminal Function of Integrated Circuits 22 Exploded Views 23 Replacement Parts List 61 62 64 69 71 79 81 95 103 104 107 111
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1 Safety Precautions
1.1. General Guidelines
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, ensure that all the protective devices such as insulation barriers and insulation papers shields are properly installed. 3. After servicing, check for leakage current checks to prevent from being exposed to shock hazards.
1.1.1.
Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1M and 5.2M. When the exposed metal does not have a return path to the chassis, the reading must be .
1.1.2.
Leakage Current Hot Check (See Figure 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 1.5k, 10 watts resistor, in parallel with a 0.15µF capacitor, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1. 3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor. 4. Check each exposed metallic part, and measure the voltage at each point. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. Should the measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.
Fig. 1
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1.2.
Caution for AC Mains Lead
1.3.
Before repair and adjustment
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Disconnect AC power, discharge AC Capacitors C5700, C5701, C5703, C5704, C5705, C5706 and C5707 through a 10, 5W
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resistor to ground. DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices. After repairs are completed, restore power gradually using a variac, to avoid overcurrent. Current consumption at AC 230V - 240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 500mA.
1.4.
Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed: · No sound is heard when the power is turned on. · Sound stops during a performance. The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are "shorted", or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used. If this occurs, follow the procedure outlines below: 1. Turn off the power. 2. Determine the cause of the problem and correct it. 3. Turn on the power once again after one minute. Note : When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
1.5.
Safety Part Information
Safety Parts List: There are special components used in this equipment which are important for safety. in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should These parts are marked by be replaced with manufacturer's specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer. Table 1
Reference No. 18 18 36 68 69 360 PCB1 A2 A2 DZ5701 L5001 L5002 L5701 L5703 T2900 T5701 T5751 PC5701 PC5702 PC5720 PC5799 F1 FP2901 TH5701 TH5860 P5701 C5700 C5701 C5703 C5704 C5705 C5706 C5707 Part No. RGRX0070C-A RGRX0070C-B RKMX0144-K REXX0684 REXX0685 RAE0165A-V REPX0622J K2CQ2CA00006 K2CT3CA00004 ERZV10V511CS G0B9R5K00003 G0B9R5K00004 ELF15N035AN ELF22V020A G4D1A0000117 ETS42BN1A6AD ETS19AB256AG B3PBA0000402 B3PBA0000402 B3PBA0000402 B3PBA0000402 K5D502BNA005 K5G4013A0001 D4CAC8R00002 D4CC11040013 K2AA2B000017 F1BAF1020020 F0CAF334A087 F0C2H1040001 F1BAF1020020 F1BAF1020020 F1BAF1020020 F1BAF1020020 Part name & Description REAR PANEL REAR PANEL TOP CABINET PRIMARY WIRE 1 (BLACK) PRIMARY WIRE 2 (RED) TRAVERSE ASSEMBLY SMPS P.C.B. AC CORD AC CORD ZENER LINE FILTER LINE FILTER LINE FILTER LINE FILTER TRANSFORMER MAIN SW TRANSFORMER BACKUP TRANSFORMER PHOTO COUPLER PHOTO COUPLER PHOTO COUPLER PHOTO COUPLER FUSE FUSE PROTECTOR THERMISTOR THERMISTOR AC INLET 1000pF 0.33uF 0.1uF 500V 1000pF 1000pF 1000pF 1000pF [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] [M] Remarks EG EB
(RTL) EG EB
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2 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD). 1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as aluminium foil, to prevent electrostatic charge build up or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder remover device. Some solder removal devices not classified as "anti-static (ESD protected)" can generate electrical charge to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize body motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).
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3 Handling Precautions For Traverse Unit
The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by the static electricity of clothes or our human body. So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup). · Way of handling the traverse deck (optical pickup) 1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock. 2. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into the flexible board (FFC board). 3. Do not to apply excessive stress to the flexible board (FFC board). When removing or connecting the short pin, finish the job in as short time as possible. 4. Do not turn the variable resistor for laser power adjustment. (It is pre-adjusted during production time)
Grounding for electrostatic breakdown prevention 1. Human body grounding Use the anti-static wrist strap to discharge the static electricity from your body. 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is place, and ground the sheet. Caution : The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup). Caution when replacing the Traverse Deck The traverse deck has a short point shorted with solder to protect the laser diode against electrostatics breakdown. Be sure to remove the solder from the short point before making connections.
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4 Precaution of Laser Diode
Caution : This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens. Wavelength : 780 nm Maximum output radiation power from pick up : 100 µW/VDE Laser radiation from pick up unit is safety level, but be sure the followings: 1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous. 2. Do not adjust the variable resistor on the pick up unit. It was already adjusted. 3. Do not look at the focus lens using optical instruments. 4. Recommend not to look at pick up lens for a long time. ACHTUNG : Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheit abgestrahlt. Wellenlänge : 780nm Maximale Strahlungsleistung der Lasereinheit :100 µW/VDE Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden: 1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist. 2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen. 3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken. 4. Nicht über längere Zeit in die Fokussierlinse blicken. ADVARSEL: I dette a apparat anvendes laser. CAUTION!
THIS PRODUCT UTILIZES A LASER. USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
s Use of caution label
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5 About Lead Free Solder (PbF)
5.1.
5.1.1.
Service caution based on legal restrictions
General description about Lead Free Solder (PbF)
The lead free solder has been used in the mounting process of all electrical components on the printed circuit boards used for this equipment in considering the globally environmental conservation. The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin (Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86°F) more than that of the normal solder. Definition of PCB Lead Free Solder being used
The letter of "PbF" is printed either foil side or components side on the PCB using the lead free solder. (See right figure)
Service caution for repair work using Lead Free Solder (PbF) · The lead free solder has to be used when repairing the equipment for which the lead free solder is used. (Definition: The letter of "PbF" is printed on the PCB using the lead free solder.) · To put lead free solder, it should be well molten and mixed with the original lead free solder. · Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC. · Since the melting point of the lead free solder is higher than that of the normal lead solder, it takes the longer time to melt the lead free solder. · Use the soldering iron (more than 70W) equipped with the temperature control after setting the temperature at 350±30 degrees C (662±86°F). Recommended Lead Free Solder (Service Parts Route.) · The following 3 types of lead free solder are available through the service parts route. RFKZ03D01K-----------(0.3mm 100g Reel) RFKZ06D01K-----------(0.6mm 100g Reel) RFKZ10D01K-----------(1.0mm 100g Reel) Note * Ingredient: Tin (Sn), 96.5%, Silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%
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6 Operation Procedures
6.1. Main Unit Key Buttons Operations
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6.2.
Remote Control Key Buttons Operations
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7 New Features
7.1. Using the Music Port
This feature enables you to enjoy music from a portable audio equipment.
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7.2.
Connecting and Playing a USB Mass Storage Class Device
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8 Self diagnosis and special mode setting
This unit is equipped with functions for checking and inspecting namely: Self-Diagnostic and Test Mode.
8.1.
Service Mode Summary Table
The service modes can be activated by pressing various button combination on the main unit and remote control unit. Below is the summary for the various modes for checking:
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8.2.
Service Mode Table 1
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8.3.
Service Mode Table 2
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8.4.
Reliability Test Mode (CRS1 Mechanism)
Below is the process flow chart of ageing for the Mechanism unit. (CRS1)
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8.5.
Error code Table Display
Self-Diagnosis Function (refer Section "8.2 Service Mode Table 1") provides information on any problems occuring for the unit and its respective components by displaying the error codes. These error code such as U**, H** and F** are stored in memory and held unless it is cleared. 20
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The error code is automatically display after entering into self-diagnostic mode.
8.5.1.
Error Code Table (For Deck Mechanism)
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8.5.2.
Error Code Table (For CD Changer)
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8.5.3.
Error Code Table (For Power Supply)
8.5.4.
CRS1 Error Code display
CRS1 Error Code display 1. The errors that occured in CRS1 Mechanism can be recalled and displayed, in the order of the occurence under self-diagnostic for procedures to enter this mode. · Only the first 5 errors will be memorized (in backup memory). The subsequence error shall be ignored and not memorize. For system with EEPROM as memory backup,memory space in EEPROM is neccesary. 2. To display all error code memorized In CRS1 Self-Diagnostic mode, press [DISC EXCHANGE] to display subsequence error code. It shall repeat after reaching error no. 5. e.g.: [1 _ _ _ _ I H M S] [DISC EXCHANGE] [2 _ _ _ _ I T O P] [DISC EXCHANGE] [3 _ _ _ _ H O M E] [DISC EXCHANGE] [4 _ _ _ _ L O A D] [DISX EXCHANGE] [5 _ _ _ _ _ U D D] [DISC EXCHANGE] 23
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3. To clear the error code memory In CRS1 Self-Diagnostic mode, long press [DISC EXCHANGE] key (2s or more) 4. To exit CRS1 Self Diagnostic mode, turn off the set.
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9 Assembling and Disassembling
9.1. Caution
Special Note: This model uses a new Mechanism unit (CRS1). In this following section does not contain the necessary disassembly & assembly information for the Mechanism unit (CRS1) except the disassembly & assembly of traverse unit. Kindly refer to the original service manual for the Mechanism unit. (Order No. MD0509368C0). "Attention Servicer" Some chassis components may have sharp edges. Be careful when disassembling and servicing. 1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components. 2. For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required. 3. Select items from the following index when checks or replacement are required. 4. Refer to the Parts No. on the page of "Replacement Parts List" (Section 23), if necessary.
Caution: After replacing of Mechanism Unit (CRS1), ageing test is necessary. Please confirm operation for Mechanism Unit (CRS1). Below is the list of disassembly sections · Disassembly of Top Cabinet · Disassembly of Mechanism Unit (CRS1) · Disassembly of Rear Panel · Disassembly of Front Panel Unit · Disassembly of Panel P.C.B., Tact Switch P.C.B. & Remote Sensor P.C.B. · Disassembly of USB P.C.B. · Disassembly of Music Port P.C.B. · Disassembly of CD Lid · Disassembly of Deck Mechanism Unit · Disassembly of Deck P.C.B. · Disassembly of Deck Mechanism · Disassembly of Deck Mechanism P.C.B. · Disassembly of Cassette Lid · Rectification for Tape Jam Problem · Disassembly of Traverse Unit · Disassembly of D-Amp P.C.B. · Replacement of Digital Power Amp IC · Disassembly of Main P.C.B. · Replacement for Switch (Q2751) · Disassembly of SMPS P.C.B. · Replacement for Switch Regulator IC (IC5701) · Replacement for Switch Regulator Diode (D5702) · Replacement for Regulator Diode (D5801) · Replacement for Regulator Diode (D5802) · Replacement for Regulator Diode (D5803) · Disassembly of AC Inlet P.C.B. Below shown is part no. of different screws types used:
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9.2.
Disassembly flow chart
The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the servicing. To assemble the unit, reverse the steps shown in the chart as below.
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9.3.
Main Components and P.C.B. Location
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9.4.
Disassembly of Top Cabinet
release the catches.
Step 1 Remove 3 screws on both sides of the top cabinet.
Step 2 Remove 5 screws at the rear panel. Step 5 Lift up the top cabinet and remove it in the direction of arrow.
Step 3 Lift the sides of top cabinet outwards as arrow shown.
9.5.
Disassembly of Mechanism Unit (CRS1)
· Follow the (Step 1) - (Step 5) of Item 9.4 Step 1 Remove 1 screw at rear cover.
Step 4 Push the top cabinet backwards as arrow shown to 29
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Step 2 Detach the FFC cables at connectors (CN2801 & CN2805) at Main P.C.B..
Special Note: During reassembling procedure, ensure both the claws and catches are fully catched. Assembly is secured upon hearing a click sound. Step 5 Release the tabs at the bottom of the front panel.
Caution: Do not exert strong force when releasing the tabs. Step 6 Shift the front panel unit slightly forward in the direction of arrows. Step 3 Release the claws outwards on both sides. Step 4 Release catches at both sides.
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Step 7 Lift up the Mechanism Unit (CRS1).
Note: For disassembly & assembly of traverse unit, please refer to original Service Manual for the Disassembly and Assembly of the Mechanism Unit (CRS1).
9.6.
Disassembly of Rear Panel
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) of Item 9.5 · Disassembly of Rear Cover Step 1 Remove 2 screws at rear cover.
· Disassembly of Mecha Chassis Step 8 Remove 2 screws. Step 9 Remove the Mecha Chassis as arrow shown.
· Disassembly of Rear Panel Step 2 Remove 7 screws at rear panel.
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P.C.B.. Step 5 Detach 22P FFC cable at connector (CN2011) at Main P.C.B..
Step 3 Release 2 catches from the side panel. Step 4 Remove the rear panel as arrow shown.
Step 6 Remove the front panel unit.
9.7.
Disassembly of Front Panel Unit
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 Step 1 Detach 27P FFC cable at connector (CN2806) at Main P.C.B.. Step 2 Detach 21P FFC cable at connector (CN3200) at Main P.C.B.. Step 3 Detach 2P wired cable at connector (CN2001) at Main P.C.B.. Step 4 Detach 10P FFC cable at connector (CN2807) at Main 32
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9.8.
Disassembly of Panel P.C.B., Tact Switch P.C.B. & Remote Sensor P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 Step 1 Remove Volume knob as arrow shown.
Step 2 Remove 8 screws at Panel P.C.B..
Step 5 Release 6 catches at Tact Switch P.C.B..
Step 3 Remove 2 screws at Tact Switch P.C.B..
Step 4 Release 2 catches at Panel P.C.B..
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Step 6 Release 2 catches at Sensor P.C.B..
Caution Notes: 1. During assembling of the P.C.B.s, ensure that the diode shown on Tact Switch P.C.B. are in upright position.
2. During reassembling procedures, ensure that D-Bass knob is seated properly.
Step 7 Lift up the Panel P.C.B., Tact Switch P.C.B. & Remote Sensor P.C.B. altogether as arrow shown.
9.9.
Disassembly of USB P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 6) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 · Follow the (Step 1) - (Step 7) of Item 9.8 Step 1 Remove 2 screws at USB unit.
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Step 2 Use a screwdriver to release the catches at both side of the USB unit.
9.10. Disassembly of Music Port P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 Step 1 Remove 2 screws at Music Port P.C.B..
Step 3 Remove USB bottom case as arrow shown.
Step 2 Release 2 catches. Step 3 Lift up the Music Port P.C.B..
Step 4 Unsolder the solder point to remove USB P.C.B..
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Note: Please ensure that the spring is assembly at right position.
9.12. Disassembly of Deck Mechanism Unit
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 Step 1 Remove 4 screws at Deck Mechanism.
9.11. Disassembly of CD Lid
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 6) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 Step 1 Remove the spring as arrow shown in order of sequences (1) to (3).
Step 2 Push the lever upward as arrow shown to open the cassette lid ass“y.
Step 2 Remove CD Lid as arrow shown.
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Step 2 Desolder 2P wires at the motor terminal. Step 3 Detach 9P cable at connector (CP1902) on Deck P.C.B..
Step 3 Remove the deck mechanism unit as arrow shown.
Step 4 Detach connector CP1301 from the Head connector.
9.13. Disassembly of Deck P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 · Follow the (Step 1) - (Step 3) of Item 9.12 Step 1 Remove 3 screws.
9.14. Disassembly of Deck Mechanism
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 37
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· Follow the (Step 1) - (Step 6) of Item 9.7 · Follow the (Step 1) - (Step 3) of Item 9.12 · Follow the (Step 1) - (Step 4) of Item 9.14
9.14.1. Replacement of Pinch Roller and Head Block
Step 1 Release catch to remove the pinch roller (F) Assy.
Step 2 Release the catches to remove the head connector.
9.14.2. Replacement of Motor, Capstan Belt A, Capstan Belt B, and Winding Belt
Step 3 Remove 2 screws at the Deck Mehcanism unit. Step 4 Remove head block.
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9.16. Disassembly of Cassette Lid 9.15. Disassembly of Deck Mechanism P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 6) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 · Follow the (Step 1) - (Step 3) of Item 9.12 · Follow the (Step 1) - (Step 4) of Item 9.13 Step 1 Desolder plunger terminals. · Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 5) of Item 9.5 · Follow the (Step 1) - (Step 6) of Item 9.7 · Follow the (Step 1) - (Step 3) of Item 9.12 Step 1 Remove the spring.
Step 2 Remove 1 screw at Deck Mechanism P.C.B.. Step 2 Push the cassette lid in the direction of arrows.
9.17. Rectification for Tape Jam Problem
· Follow the (Step 1) - (Step 5) of Item 9.4 Step 1 If a cassette tape cannot be removed from the deck (the tape is caught by the capstan or pinch roller during playback or recording), rotate the flywheel F in the direction of the arrow to remove it.
Step 3 Release 3 catches to remove the Deck Mechanism P.C.B..
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Important notes: Ensure all the trays are in the "STOCK" position before proceeding to the disassemble of traverse unit. For procedures to set the trays in "STOCK" position, please refer to (5.3 Setting the Tray In "STOCK" position for CRS1 Service Manual order no. MD0509368C0)
Step 2 Push the lever upward and open the cassette lid.
Step 1: Press and hold the plunger lever and rotate the gear as arrows shown until it stop.
Note: Follow Disassembly of Cassette Lid. Remove the cassette tape.
9.18. Disassembly of Traverse Unit
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 9) of Item 9.5
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Step 2: Push the traverse slide plate as arrow shown to release the traverse unit. Caution: Do not exert strong force on the traverse slide plate.
Step 1: Turn over the unit and install the traverse unit.
Step 3: Remove the traverse unit as arrow shown. · Assembly of Traverse Unit Step 2: Push the traverse slide plate as arrow shown to lock the traverse unit.
9.19. Disassembly of D-Amp P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 3) - (Step 7) of Item 9.5 Step 1 Detach 17P FFC cable at connector (CN5050) at DAmp P.C.B.. 42
SA-AK270EB / SA-AK270EG
Step 2 Detach 8P wire connector (CN5500) at D-Amp P.C.B..
Step 4 Remove 4 screws at the rear panel.
Step 5 Lift up the D-Amp P.C.B. together with the chassis support as arrow shown.
Step 3 Remove 2 screws at D-Amp P.C.B. chassis support .
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9.20. Replacement of Digital Amp IC (IC5000)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 7) of Item 9.19 Step 1 Flip over D-Amp P.C.B.. Step 2 Desolder pins of the Digital Power Amp IC (IC5000) on the reverse side of D-Amp P.C.B..
Step 3 Remove 1 screw. Step 6 Remove 3 screws from D-Amp P.C.B..
Step 7 Lift up D-Amp P.C.B. as arrow shown.
Step 4 Remove TR Spring in the direction of arrow shown. Step 5 Remove Digital Power Amp IC (IC5000) from the heat sink unit A. Caution: Handle the heat sink power unit A with caution due to its high temperature after prolonged use. Touching it, may lead to injuries. Note: During reassembling procedures, ensure the P.C.B. is seated properly at the chassis support.
9.20.1. Assembly of Digital Power Amp IC (IC5000)
Step 1 Fix the Digital Power Amp IC onto the heat sink unit A. Step 2 Screw back TR Spring onto the heat sink unit A. 44
SA-AK270EB / SA-AK270EG
Make sure it is well tighten to prevent overheat. Note: Use a blower to remove the minute particles that might caused left on the TR Spring.
Step 6 Detach 11P wires cable at connector (CN5802) at SMPS P.C.B..
9.21. Disassembly of Main P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 Step 1 Detach 27P FFC cable at connector (CN2806) at Main P.C.B.. Step 2 Detach 21P FFC cable at connector (CN3200) at Main P.C.B.. Step 3 Detach 22P FFC cable at connector (CN2011) at Main P.C.B.. Step 4 Detach 10P FFC cable at connector (CN2807) at Main P.C.B.. Step 5 Detach 2P wired cable at connector (CN2001) at Main P.C.B.. Step 7 Remove 2 screws.
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Step 8 Remove 1 screw at rear panel.
Step 2 Remove 1 screw form the Main P.C.B..
Step 3 Remove the Voltage Regulator IC (IC2731) from the heat sink. Caution: Handle the heat sink with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
9.22.1. Assembly of Voltage Regulator IC (IC2731)
Step 1 Apply grease to heat sink. Step 9 Lift up Main P.C.B. as arrow shown. Step 2 Fix and screw the Voltage Regulator IC (IC2731) to the heat sink.
Note: Ensure the Voltage Regulator IC (IC2731) is tightly screwed to the heat sink.
Cautipn Note: While lifting up Main P.C.B., please handle Jack (JK2801) and Tuner Pack with care.
9.23. Replacement of Switch (Q2751)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 8) of Item 9.21 Step 1 Desolder pins of the Switch (Q2751) on the reverse side of Main P.C.B..
9.22. Replacement of Voltage Regulator IC (IC2731)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 8) of Item 9.21 Step 1 Desolder pins of the Voltage Regulator IC (IC2731) on the reverse side of Main P.C.B..
Step 2 Remove 1 screw form the Main P.C.B..
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Step 2 Remove 4 screws at SMPS P.C.B..
Step 3 Remove the Switch (Q2751) from the heat sink. Caution: Handle the heat sink with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
9.23.1. Assembly of Switch (Q2751)
Step 1 Apply grease to heat sink. Step 2 Fix and screw the Switch (Q2751) to the heat sink.
Step 3 Lift up the SMPS P.C.B. as arrow shown.
Note: Ensure the Switch (Q2751) is tightly screwed to the heat sink.
9.24. Disassembly of SMPS P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 Step 1 Detach 8P wires at connector (CN5802) at SMPS P.C.B..
Step 4 Flip the SMPS P.C.B. and desolder 2 wires pins (red and black).
Note: During reassembling procedures, ensure the P.C.B. is seated properly at the locator.
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9.25. Replacement of Switch Regulator IC (IC5701)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 4) of Item 9.24 Step 1 Desolder pins of the switch regulator IC (IC5701) on the reverse side of SMPS P.C.B..
Note : Refer to the diagrams of SMPS P.C.B. (Item 19.6.) for location of the part.
9.25.1. Assembly of Switch Regulator IC (IC5701)
Step 1 Apply grease to the heat sink A. Step 2 Fix and screw the switch regulator IC (IC5701) to the heat sink A. Special Note: Ensure the switch regulator IC (IC5701) is tightly screwed to the heat sink A.
Step 2 Remove 1 screw from the switch regulator IC (IC5701). Step 3 Remove the switch regulator IC (IC5701) from the heat sink A. Caution: Handle the heat sink A with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
Step 3 Solder pins of the switch regulator IC (IC5701) on the reverse side of SMPS P.C.B..
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Step 6 Remove the switch regulator diode (D5702) from the heat sink A. Caution: Handle the heat sink A with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
Special Note: Ensure pins of the switch regulator IC (IC5701) are properly seated and soldered on SMPS P.C.B..
9.26. Replacement of Switch Regulator Diode (D5702)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 4) of Item 9.24 Step 1 Desolder pins of the switch regulator diode (D5702) on the reverse side of SMPS P.C.B.. Step 2 Desolder pins of the heat sink A.
Note : Refer to the diagrams of SMPS P.C.B.. (Item 19.6.) for location of the part.
9.26.1. Assembly of Switch Regulator Diode (D5702)
Step 1 Apply grease to the heat sink A. Step 2 Fix and screw the switch regulator diode (D5702) to the heat sink A. Special Note: Ensure the switch regulator diode (D5702) is tightly screwed to the heat sink A. Step 3 Fix the heat sink A on SMPS P.C.B. in the direction of arrows. Step 4 Fix and screw the switch regulator IC (IC5701) to the heat sink A.
Special Note: Ensure the heat sink A is properly seated on SMPS P.C.B.. Step 3 Remove 1 screw from the switch regulator IC (IC5701). Step 4 Remove the heat sink A in the direction of arrows. Step 5 Remove 1 screw from the switch regulator diode. (D5702). Step 5 Solder pins of the switch regulator diode (D5702) on the reverse side of SMPS P.C.B.. Step 6 Solder pins of the heat sink A on the reverse side of SMPS P.C.B..
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Note: Refer to the diagrams of SMPS P.C.B. (Item 19.6.) for location of the part.
9.27.1. Assembly of Regulator Diode (D5801)
Special Note: Ensure pins of the switch regulator diode (D5702) are properly seated and soldered on SMPS P.C.B.. Step 1 Apply grease to the heat sink unit C. Step 2 Fix and screw the regulator diode (D5801) to the heat sink unit C. Special Note: Ensure the regulator diode (D5801) is tightly screwed to the heat sink unit C.
9.27. Replacement of Regulator Diode (D5801)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 4) of Item 9.24 Step 1 Desolder pins of the regulator diode (D5801) on the reverse side of SMPS P.C.B..
Step 3 Solder pins of the regulator diode (D5801) on the reverse side of SMPS P.C.B..
Step 2 Remove 1 screw from the regulator diode (D5801). Step 3 Remove the regulator diode (D5801) from the heat sink unit C. Caution: Handle the heat sink unit C with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
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Special Note: Ensure pins of the regulator diode (D5801) are properly seated and soldered on SMPS P.C.B..
screwed to the heat sink unit C.
9.28. Replacement of Regulator Diode (D5802)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 4) of Item 9.24 Step 1 Desolder pins of the regulator diode (D5802) on the reverse side of SMPS P.C.B..
Step 3 Solder pins of the regulator diode (D5802) on the reverse side of SMPS P.C.B..
Step 2 Remove 1 screw from the regulator diode (D5802). Step 3 Remove the regulator diode (D5802) from the heat sink unit C. Caution: Handle the heat sink unit C with caution due to its high temperature after prolonged use. Touching it may lead to injuries. Special Note: Ensure pins of the regulator diode (D5802) are properly seated and soldered on SMPS P.C.B..
9.29. Replacement of Regulator Diode (D5803)
· Follow the (Step 1) - (Step 5) of Item 9.4 · Follow the (Step 1) - (Step 7) of Item 9.5 · Follow the (Step 1) - (Step 5) of Item 9.19 · Follow the (Step 1) - (Step 4) of Item 9.24 Step 1 Desolder pins of the regulator diode (D5803) on the reverse side of SMPS P.C.B..
Note: Refer to the diagrams of SMPS P.C.B. (Item 19.6.) for location of the part.
9.28.1. Assembly of Regulator Diode (D5802)
Step 1 Apply grease to the heat sink unit C. Step 2 Fix and screw the regulator diode (D5802) to the heat sink unit C. Special Note: Ensure the regulator diode (D5802) is tightly 51
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Step 2 Remove 1 screw from the regulator diode (D5803). Step 3 Remove the regulator diode (D5803) from the heat sink unit C. Caution: Handle the heat sink unit C with caution due to its high temperature after prolonged use. Touching it may lead to injuries.
Special Note: Ensure pins of the regulator diode (D5803) are properly seated and soldered on SMPS P.C.B..
9.30. Disassembly of AC Inlet P.C.B.
· Follow the (Step 1) - (Step 5) of Item 9.4 Step 1 Remove 2 screws at AC Inlet P.C.B.. Note: Refer to the diagrams of SMPS P.C.B.. (Item 19.6.) for location of the part.
9.29.1. Assembly of Regulator Diode (D5803)
Step 1 Apply grease to the heat sink unit C. Step 2 Fix and screw the regulator diode (D5803) to the heat sink unit C. Special Note: Ensure the regulator diode (D5803) is tightly screwed to the heat sink unit C.
Step 2 Cut 2 tie wraps.
Step 3 Solder pins of the regulator diode (D5803) on the reverse side of SMPS P.C.B.. Step 3 Remove 1 screw at the rear panel.
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between AC Inlet P.C.B. to the chassis. Note: During reassembling procedures, ensure the P.C.B. is seated properly at the locators.
Step 4 Detach the rear panel slightly backward as arrow shown.
Step 5 Lift up the AC Inlet P.C.B..
Step 6 Flip over the AC Inlet P.C.B. and desolder 2 wires pins (red and black).
Caution: Remember to use tie wraps to tie red/ black wires 53
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10 Service Fixture and Tools
Service Extension FFC (A) Main P.C.B. (CN2341) - D-Amp P.C.B. (CN5050) (B) Main P.C.B. (CN2701) - SMPS P.C.B. (CN5802) (C) SMPS P.C.B. (H5801) - D-Amp P.C.B. (CN5500) Tools REEX0930 (17P FFC Wires) REXX0680 (11P Wires) REXX0683 (8 Pin Flat Wires)
11 Service Positions
Note: For description of the disassembly procedures, see the Section 9.
11.1. Checking and Repairing of Main P.C.B.
Step 1 Remove the top cabinet .
Note: Main P.C.B. can be checked at its original position.
11.2. Checking and Repairing Panel, Deck P.C.B., Tact Switch P.C.B., and Music Port P.C.B.
Step 1 Remove the top cabinet. Step 2 Remove Mechanism unit (CRS1). Step 3 Detach 27P FFC cables at connector (CN2806) at Main P.C.B.. Step 4 Detach 21P FFC cables at connector (CN3200) at Main P.C.B.. Step 5 Detach 22P FFC cables at connector (CN2011) at Main P.C.B.. Step 6 Detach 10P FFC cables at connector (CN2807) at Main P.C.B.. Step 7 Detach 2P wired cable at connector (CN2001) at Main P.C.B.. Step 8 Remove the front panel unit.
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Step 9 Remove 4 screws at the Deck Mechanism unit.
Step 12 Connect 27P FFC cable at connector (CN2806) at Main P.C.B.. Step 13 Connect 21P FFC cable at connector (CN3200) at Main P.C.B.. Step 14 Connect 10P FFC cable at connector (CN2807) at Main P.C.B.. Step 15 Connect 22P FFC cable at connector (CN2011) at Main P.C.B.. Step 16 Connect 2P wired cable at connector (CN2001) at Main P.C.B..
Step 10 Connect 22P FFC cable at connector (CN2801) at Main P.C.B.. Step 11 Connect 14P FFC cable at connector (CN2805) at Main P.C.B..
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Step 17 Check and repair Panel P.C.B., Deck P.C.B., Tact Switch P.C.B., and Music port P.C.B..
11.3. Checking and Repairing of DAmp P.C.B.
· Follow (Step 1) - (Step 2) of item 11.2 Step 1 Detach 17P FFC cable at connector (CN5050) at DAmp P.C.B.. Step 2 Detach 8P wires cable at connector (CN5500) at D-Amp P.C.B..
Step 4 Remove 4 screws at the rear panel.
Step 3 Remove 2 screws at chassic supports.
Step 5 Lift up the D-Amp P.C.B. together with the chassic support as arrow shown.
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Step 10 Attach original cable with extension cable (REXX0683) (8P cable from H5801 to CN5500). Step 11 Connect extension cable (REEX0930) (17P cable from CN2341 to CN5050). Step 6 Remove 3 screws from D-Amp P.C.B..
Step 7 Lift up D-Amp P.C.B. as arrow shown.
Step 13 Check and repair D-Amp P.C.B. according to the diagram shown.
11.4. Checking and Repairing of AC Inlet P.C.B. & SMPS P.C.B.
· Follow (Step 1) - (Step 7) of item 11.2 Step 8 Connect 22P cable at the connector (CN2801) on Main P.C.B.. Step 9 Connect 14P cable at the connector (CN2805) on Main P.C.B.. 57 · Follow (Step 1) - (Step 5) of item 11.3 Step 1 Detach wire connector at connector CN5802 at SMPS P.C.B..
SA-AK270EB / SA-AK270EG
Step 5 Remove 1 screw at the rear panel.
Step 2 Remove 4 screws.
Step 6 Move the rear panel slightly backward as arrow shown, lift up the AC Inlet P.C.B. together with the SMPS P.C.B.. Step 3 Remove 2 screws at AC Inlet P.C.B..
Step 4 Cut 2 tie wraps onto wires.
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Step 7 Position SMPS P.C.B. & AC Inlet P.C.B. according to the diagram shown. Step 8 Connect 22P cable at the connector (CN2801) on Main P.C.B.. Step 9 Connect 14P cable at the connector (CN2805) on Main P.C.B..
Step 10 Attach original cable with extension cable (REXX0683) (8P cable from H5801 to CN5500). Step 11 Attach original cable with extension cable (REXX0680) (11P cable from CN2701 to CN5802). Step 12 Connect extension cable (REEX0930) (17P cable from CN2341 to CN5050).
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Step 13 Service AC Inlet P.C.B. & SMPS P.C.B. respectively.
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12 Procedure for Checking Operation of Individual Parts of Deck Mechanism Unit
12.1. Operation Check with Cassette Tape
1. Pull up the EJECT lever using a rubber band. (Fig. 6) 2. Supply DC5V to MOTOR. ( MOTOR rotates.) (Fig. 5) 3. Insert a cassette tape to the unit. 4. Supply DC9V to the plunger, and turn the power ON and OFF. ( Power +PL, -PL) (Fig. 5) a. FWD PLAY: Supply the plunger power in a flash. (ON: approx. 5msec) b. FWD FF: Supply the plunger power in a flash at PLAY mode. (ON: approx. 5msec) c. STOP: Supply the plunger power in a flash at FWD FF mode. (ON: approx. 5msec) d. REV PLAY: Supply the plunger power in a normal timing at STOP mode. (ON: approx. 200msec) e. REV REW: Supply the plunger power in a flash at REV PLAY mode. (ON: approx. 50msec) f. STOP: Supply the plunger power in a flash at FF mode. (ON: approx. 50msec) Repeat the operation ( FWD PLAY) (Note) Other operation may start if a timing of supplying the plunger power is missed.
12.1.1. Connection Status between Mechanism and Power Supply (Motor, Plunger)
12.1.2. Operative Parts of Deck Mechanism Unit (EJECT lever fitted with rubber band, Plunger/Rib operation)
Fig. 6
12.2. Operation Check without Cassette Tape
1. Pull up the EJECT lever using a rubber band. (Fig. 6) 2. Supply DC5V to MOTOR. ( MOTOR rotates.) 3. Lift up the mechanism unit's plunger/rib with the tip of a negative screwdriver, and operate the unit in the same timing as supplying the power. (Fig. 7)
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13 Measurement And Adjustments
13.1. Cassette Deck Section
13.1.1. Requirements
· Test tape (QZZCFM) (QZZCWAT) · Normal blank cassette tape (QZZCRA) · Digital frequency counter · Oscilloscope · Electrical voltmeter · Headphone jack output jig (Fig 8)
13.1.2. Setting of Unit
· VOLUME: MAX
13.1.3. Preparations
1. Apply under [9. Assembling and Disassembling]. 2. Remove 4 screws from the mechanism unit to disassemble. under [9.13 Disassembly of Deck Mechanism Unit]. 3. Connect the headphone jack output jig (Fig 8) to headphone jack.
Fig. 8
Fig. 9
13.1.4. Tape Speed Adjustment
· Normal speed adjustment (only during forward playback) 62
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(Product reference value: 3,000±90Hz) 1. Connect a frequency indicator. (Fig 10) 2. Playback the middle portion of the test tape (QZZCWAT). 3. Adjust the motor screw so that the following output level is produced. (Fig 11) Adjustment Range: 3,000 ± 90Hz (a constant speed)
Fig. 10
Fig. 11
13.1.5. Bias Voltage Check
1. Connect an electrical voltmeter. (Fig 12) (Fig 9 for location of Test point) 2. Set the function to "TAPE" position. 3. Insert a normal blank cassette tape (QZZCRA). )] button, press [TAPE( 4. While pressing and holding down [REC( pressing the buttons till the recording pause mode is activated.) 5. Check that the output level is within the standard range. Standard Range: 20 ± 3mV )] button to pause the recording mode. (Repeat
Fig. 12
13.1.6. Bias Frequency Check
1. Connect a digital frequency counter (Fig 13). 2. Set the function to "TAPE" position. 3. Insert a normal blank cassette tape (QZZCRA) and press "REC" mode on main unit. 4. Check that the output frequency is within the standard range.
Standard Value: 100 ±8 kHz
Fig. 13
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14 Voltage Measurement and Waveform Chart
Note: Circuit voltage and waveform described herein shall be regarded as reference information when probing defect point, because it may differ from an actual measuring value due to difference of Measuring instrument and its measuring condition and product itself.
14.1. Voltage Measurement
14.1.1. CD Servo P.C.B. & Tact Switch P.C.B.
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14.1.2. Main P.C.B.
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14.1.3. SMPS P.C.B., D-Amp P.C.B. & Panel P.C.B.
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14.1.4. Deck P.C.B., Deck Mechanism P.C.B. & USB P.C.B.
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14.2. Waveform Chart
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15 Wiring Connection Diagram
PbF
F REMOTE SENSOR P.C.B.
SOLDER SIDE 1........8
PbF
J6501B* CAUTION RISK OF ELECTRIC SHOCK AC VOLTAGE LINE. PLEASE DO NOT TOUCH THIS P.C.B.
J6001B*
3..1
PbF
CN7002
21 ................. 22 .................
D TACT SWITCH P.C.B.
PbF
SOLDER SIDE
A CD SERVO P.C.B.
SOLDER SIDE
BLK
CN6001
26 . . . . . . . . 2 27 . . . . . . . . . . 1
K SMPS P.C.B.
SOLDER SIDE
RED
PbF
C PANEL P.C.B.
3..1
SOLDER SIDE
1
2 2 1
.. . .. .. .. .. .. .. .. .. .. .
OPTICAL PICKUP
J6001
J6501A*
1........8
M
TRAVERSE MOTOR M7301*
1615
T5701 (MAIN TRANSFORMER)
PbF
CN7001
SPINDLE MOTOR M7302*
M
J D-AMP P.C.B.
SOLDER SIDE
CN5500
8 .... 1
JK5001 FRONT SPEAKERS CN5050
16 . . . . 2 17 . . . . . .1
T5751 (BACKUP TRANSFORMER) FOR DEBUGGING
1 2 .... ....
PbF
21 22
USB CONNECTOR
PbF
P901
P903
B MAIN P.C.B.
SOLDER SIDE
4. .2 5. . . .1
TO CRS1 (CN1) CN2811
1...7 2...8
I USB P.C.B.
SOLDER SIDE (SIDE B)
CN5802
11. . . . . . . . . . . 1
H5801*
8...........1
PbF
CP1301 TO R/P HEAD
CN3200 CN2801
22 . . . . 2 21 . . . . . 1
14 . . . . . 2 13 . . . . . 1
CN2805
G DECK P.C.B.
SOLDER SIDE
1 . . . . . 21 2 . . . . . 22
27 .......... 1
26 ........ 2
2 1
CN3601
MOTOR 10 . . . . . 1
CN2806
E MUSIC PORT P.C.B.
TO TUNER PACK
SOLDER SIDE
PbF
AC IN
L AC INLET P.C.B.
SOLDER SIDE
WR1903
CN1305
20 21
..............
.............
230V ~ 240V 50Hz
RED
PbF
2
BLK
1
CN2341
16 . . . . 2 17 . . . . . .1
CP1902
9...........1
CN2011
2 1 .......... ........
JK6810 MUSIC PORT CN6807
2 1 .... ...
CN2701*
1 . . . . . . . . . 11
20
21
10
9
HEADPHONE JK6800 ZJ6801
2 1
CN2807
PbF
9 10
...... ......
CS971 PL+ PL-
1......9
1
2
SOLENOID Note: "*" For indication only.
H DECK MECHANISM P.C.B.
SOLDER SIDE
CN2001
2 1
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16 Block Diagram
16.1. CD Servo Diagram
OPTICAL PICKUP
SEMICONDUCTOR LASER
Q7601 LASER POWER DRIVE B STAT CN7002 CN2801 4 19 CN7002 CN2801 17 6 CN7002 CN2801 15 8 CN7002 CN2801 16 7
MLD MCLK
TO MAIN (2/2)
B
MDATA
PHOTO DETECTOR
A 81 B B TO MAIN (2/2) B F A, B, C, D, E, F B E
ARFF
X7201 80
X2 (SMCK) (PMCK)
70
STAT
69 67 68
MCLK MDATA MLD
51 53 52 54
ARFIN IREF DSLF PLLF
55
PLLFO
3.3V 3.3V CN2801 CN7002 20 3
79 REGON 82 NTEST 61 NSRVMONON 72 NRST
X1
3.3V 3.3V
47 AVDD2 31 AVSS2 35~40 A,B,C,D,E,F 42 41 50 49 48
LD PD
TIMING GENERATOR [GEN]
MICRO COMPUTER INTERFACE [MCIF] SPINDLE CPU [DSV]
DSL/PLL/VCO [DSLPLL] EFM DEMODUALTION SYNC INTERPOLATION CIRC ECC CDROM ECC [DEMECC] CIRC RAM
TXTCK TXTD DQSY
3.3V
SUBCODE INTERFACE [DEMECC]
(SBCK) (SUBC) (TXNCLDCK) FLAG BLKCK 65 71 20 18
ARFFB ARFOUT ARFDC
B
IC7002 BA5948FPE2
VREF VREF
4 CH DRIVE
VREF 26
45 RFOUT 46 RFIN 43 CENV CTRCRS 32 OSCIN 34 VREF 44 RFENV
CMOS RF AMPLIFIER
SERVO CPU [DSV] BUS CONTROL UNIT [BCU]
CN7002 CN2801 5 18 3.3V
TO MAIN (2/2)
1Mbit DRAM
PRAMVDD33 PRAMVSS33
D0~D15 A0~A11 BA0,BA1
83~92,94~99 1~7,11~15 16,17 8,9 10,100
VREF
FOP 22 PC 21 SPOUT 23 TRVP 24 TRP 25 FOP 29 SRVMON0 30 SRVMON1
A/D CONVERTER
MP3/WMA DECORDER FS CONVERTER [FSC] SERIAL OUTPUT INTERFACE [DAO]
NWE,NCAS NRAS,SDRCK EXT0 EXT1 EXT2 (LRCK) (BCLK) (SRDATA)
F-
16 D3[CH3] 15 D3+ LEVEL SHIFT
FOCUS COIL
IN3
28
F+
62 63 64
CN7002 CN2801 17 6 CN7002 CN2801 16 7 CN7002 CN2801 15 8 TO MAIN (2/2)
T-
18 D4[CH4] 17 D4+ LEVEL SHIFT
OUTPUT PORT
TRACKING COIL
IN4
27
TRP
DIGITAL FILTER 1bitDAC PWM LOGIC [DF, MASH] REGULATOR ANALOG LOWPASS FILTER
T+
(DVDD2) 76
SPINDLE MOTOR
M7302
M TRVM SPSP+
TRV+
14 D2+ 13 D2-
[CH2]
LEVEL SHIFT
IN2 1
TRVP
DIGITAL OUT
AVSS1
IOVDD2
TRAVERSE MOTOR
M7301
12 D1+ 11 D1-
[CH1]
LEVEL SHIFT MUTE [CH1] MUTE [CH2]
IN1 3
SPOUT
PC1 4 PC2 2
PC
SERVO PROCESSOR/ DIGITAL SIGNAL PROCESSOR/ DIGITAL FILTER D/A CONVERTER
IC7001 MN6627954MA
66
57 58 59 56
60 78 26
76
28 93 27
IOVDD1
DRVDD
DVDD2
DVDD1
AVDD1
DVSS3
DVSS2
DVSS1
OUTR
OUTL
TX
77 S7201 REST SWITCH CN7002 CN2801 2 21 CN7002 CN2801 21 2 CN7002 CN2801 19 4
3.3V 3.3V
3.3V 3.3V 3.3V LCH OUT RCH OUT
TO MAIN (2/2) TO MAIN (1/2)
SA-AK270EB/EG CD SERVO BLOCK DIAGRAM
71
SA-AK270EB / SA-AK270EG
16.2. Main Diagram
IC2803 C1AB00002885
ASP IC
IN-L2 IN-R2 IN-L3 IN-R3
TO TUNER
CN3601 6 CN3601 8 CN7002 CN2801 21 2 CN7002 CN2801 19 4
37 3 38 2
TUNER
L-OUT 22 R-OUT 17
FROM CD SERVO
2 3 6 5 Q2312 SWITCH Q2311 SWITCH
OP AMP
IC2804 C0AABB000125 1 7 Q2360 SWITCH Q2359 SWITCH
CN2341 CN5050 1 17 CN2341 CN5050 3 15
FROM D-AMP
CD
TO PANEL
CN6807 CN2807 5 6 CN6807 CN2807 3 8
40 52
IN-L4 IN-R4
MUSIC PORT
Q2335 SWITCH Q2336 SWITCH
REC-L 34 REC-R 7 RRE-IN-L 33
CN1305 CN2011 8 CN1305 CN2011 9
TO DECK
36 IN-L1 4 IN-R1
PRE-IN-R 6 TAPE
SDA
20
19 QR2317 MUTE CONTROL
CN2807 CN6807 1 10 CN2807 CN6807 3 8
MUTEA
SCL
FROM PANEL
CN2011 CN1305 12 CN2011 CN1305 13
FROM DECK
IC2809 C1BB00001137
RDS IC
TO TUNER PACK
ASP_DA ASP_CLK
RDQA RDCL XIN 2 16 RDS_DA RDS_CLK
CN3601 10
4 MPXin XOUT 14
13 X2901
Q2735 +8V SWITCH IC2731 C0CAAKG00046 1
T2900
VOLTAGE REGULATOR
IN GND OUT 3
2
CN2806 CN6001 4 24
FROM PANEL
FROM SMPS
CN5802 CN2701* 8,9
Q2900 SWITCH
TRANSFORMER
CN2806 CN6001 3 25 CN2806 CN6001 4 24
SA-AK270EB/EG MAIN (1/2) BLOCK DIAGRAM
72
CD3.3V MUTEA ASP_DA ASP_CLK LM_1
RDS_DA RDS_CLK
IC2701 C0DAAYY00042
DC-DC CONVERTER
3 OUT 2 Q2711
4 RDS_DA 5 RDS_CLK 24
GND
SWITCH MUTE_A 35 37
ASP_DAT HP_SW
Q2772 36 38
ASP_CLK LVL_METER PA_SW
Q2771
SWITCH 1 85
DECK_EJECT
SWITCH 44
DCDET SMPS-BP
FROM PANEL
CN2807 CN6807 7 4 CN2807 CN6807 5 6 CN2807 CN6807 9 2
45
FROM SMPS 27
CN5050 CN2341 5 13
MUTE_F
CN5802 CN2701* 4 CN5802 CN2701* 11
Q2751
SWITCH
-9V Q2761
Q2763
+9V
SWITCH
SWITCH
7
FROM D-AMP 39
CN5050 CN2341 14 4 CN5050 CN2341 17 1
F_HOP MUTE_DA
48
CN1305 CN2011 21 CN1305 CN2011 14
PHOTO
VREF
Q2812 PCONT SWITCH
52 50
DECK REC
Q2011
SWITCH
CN1305 CN2011 1
DECK_PLUNGER
34
BUSY
FROM DECK
CN1305 CN2011 2 CN1305 CN2011 4 CN1305 CN2011 6
32
49
Q2012 SWITCH
DECK MOTOR
IPOD_RXD DECK_AD2 IPOD_TXD
31 12
FROM DEBUG USING
97 95 26 22 23
EFP_RESET DECK_ AD1 EFP_CNVSS
9 59
VERR PLL_SD TUNER_IN PLL_CLK MMOD0 TERR
CN2811 4 CN2811 7 CN2811 8 CN2811 1 CN2811 2 CN2811 6
60 61
TO TUNER PACK
73
TO CRS1D FROM PANEL FROM SMPS
74
21
CN3601 1 CN3601 2 CN3601 3 CN3601 4
TUNER OUT/ST
USB_IRQ/WR START USB_SCL
29 15
XIn Xout
IC2801 RFKWAK270PL
X2815 13
FROM USB
MICROPROCESSOR
65 66 80 67 68 69 70 72 73
CCW CW HOME_SW ST SW OPEN SW CLOSE SW
30 10
USB_SDA XciN Xcout
X2910 11 33
USB_RST(CLK) PLAY SW UD SENSOR BOTTOM SW
CN2805 1 CN2805 2 CN2805 5 CN2805 6 CN2805 7 CN2805 8 CN2805 11 CN2805 13 CN2805 14 CN2805 12
CN3200 P901 4 CN3200 P901 22 CN3200 P901 14 CN3200 P901 5 CN3200 P901 3 CN3200 P901 8 CN3200 P901 10 CN3200 P901 11 CN3200 P901 13 CN3200 P901 6 CN3200 P901 15 CN3200 P901 16 CN3200 P901 17 CN3200 P901 18 CN3200 P901 19
Q2936 CD SUPPLY CTRL SWITCH 12V
78
MCLK MDATA_OUT MLD BLKCK
FROM CD SERVO
77 76 19
Q2937 RESET (MICRO-P SWITCH)
Q2970
71
75
SWITCH
CN6001 CN2806 1 27
PLUNGER
VREF+
STATUS CD_RST VOL_LED /REST_SW
81 79
53 54 90 55 56 57 58 92 93 94 18 63 20
CN2801 6 CN2801 7 CN2801 8 CN2801 15 CN2801 16 CN2801 17 CN2801 18 CN2801 19 CN2801 20 CN2801 21
CN7002 17 CN7002 16 CN7002 15 CN7002 8 CN7002 7 CN7002 6 CN7002 5 CN7002 4 CN7002 3 CN7002 2
47
FL CLK VOL_JOG FL_DOUT FL_CS BASS JOB1 BASS JOB2 KEY3 KEY2 KEY1 RMT D BASS_LED SYNC
DCDET1 PCONT
46 VCC 3 Q2745 41
EE_CS/EFP/EPM EE_CLK EE_DAT
SWITCH
EE_CS
4 43
IC2741 C0DBZGC00067
2 GND IN 1 5 OUT CTRL 3
REGULATOR IC
42
EE_CLK
5
EE_DAT
-13V
Q2743 DECK SUPPLY CTRL SWITCH VREF+
IC2951 EEPROM IC (NOT SUPPLIED)
CN6001 CN2806 6 22 CN6001 CN2806 21 7 CN6001 CN2806 6 22 CN6001 CN2806 8 20 CN6001 CN2806 9 19 CN6001 CN2806 9 19 CN6001 CN2806 8 20 CN6001 CN2806 12 16 CN6001 CN2806 17 11 CN6001 CN2806 18 10 CN6001 CN2806 15 13 CN6001 CN2806 7 21 CN5802 CN2701* 1
CN2701* CN5802 10
CN2701* CN5802 5
CN2341 CN5050 2 16
CN2701* CN5802 2
SA-AK270EB/EG MAIN (2/2) BLOCK DIAGRAM
SA-AK270EB / SA-AK270EG
FROM SMPS
FROM D-AMP
SA-AK270EB / SA-AK270EG
16.3. Panel, Remote Sensor, Music Port, Headphone & Tact Switch Diagram
SG1 -SG16
FL6601 5-16 31-42 G1 -G12
FL1 1
25-40 14-29 S1 -S12
FL2 44
A2BB00000171
FL DISPLAY
CN6001 CN2806 3 25 CN6001 CN2806 4 24
TO MAIN (1/2)
DIN
7 8 9
CN6001 CN2806 8 20 CN6001 CN2806 7 21 CN6001 CN2806 9 19
TO MAIN (2/2)
IC6601 C0HBB0000057
FL DRIVER
CLK STB
CN2806 CN6001 8 20
TO MAIN (2/2)
VR6630 BASS CONTROL
CN2806 CN6001 9 19
CN6001 CN2806 18 10
TO MIC
TO MAIN (2/2)
CN6701 H6601 2
S6108 D.BASS
S6106 TAPE REC
S6101 DISPLAY
S6100 POWER
TACT SWITCH CIRCUIT
CN2806 CN6001 6 22 J6501A* J6501B* 8
DVEF+
VR6500 MAIN VOLUME JOG S6300 FWD
S6207 CD_5
S6206 CD_4
S6205 CD_3
S6204 CD_2
S6202 S6201 S6200 S6203 CD_1 SGL_CHG MULTI_CHG OPEN/CLOSE D6458
H6502* H6501* 6
TO TACT SWITCH
S6301 MANUAL EQ
S6302 REW
S6303 TAPE
S6304 TUNER
S6306 CD
S6307 S6308 USB MUSIC PORT
CN6001 CN2806 1 27
TO MAIN(2/2)
CN2806 CN6001 16 12 CN2806 CN6001 22 6 CN2806 CN6001 17 11
J6501A* J6501B* 3 J6501A* J6501B* 1 J6501A* J6501B* 6
TACT SWITCH P.C.B
REMOTE SENSOR CIRCUIT
Q6511 SWITCH S6208 STOP/-DEMO D6511 D6512
J6501B* H6501A* 5
Z6601 REMOTE SENSOR
J6001B J6001 1
S6820 EJECT
REMOTE SENSOR P.C.B
CN6001 13 CN6807 7 CN6001 11 CN6807 2
CN2806 15 CN2807 4 CN2806 17 CN2807 9
TO MAIN (2/2)
JK6810 MUSIC PORT
CN6807 CN2807 6 5 CN6807 CN2807 5 6 CN6807 CN2807 3 8
TO MAIN (1/2)
JK6800 HEADPHONE
CN6807 CN2807 1 10 CN6807 CN2807 8 3
SA-AK270EB/EG PANEL / REMOTE SENSOR / MUSIC PORT / HEADPHONE / TACT SWITCH BLOCK DIAGRAM
74
SA-AK270EB / SA-AK270EG
16.4. D-Amp Diagram
IC5000
CN2341 CN5050 3 15
JK5001 L5000 L5001
C1BA00000487 AUDIO DIGITAL POWER AMP
2 IN1+ OUT1 10 OUT2 14 VDDA1 4 VDDA2 20 VSSA1 6 VSSA2 18
SPEAKER
FR RIGHT SPEAKER
FR+ FL+
TO MAIN (1/2)
3 IN1-
CN2341 CN5050 1 17 CN2341 CN5050 1 17
21 Q5604 SWITCH Q5601 Q5603 SWITCH
SW+5V
IN2+
22 IN21 OSC 23 MODE
TO MAIN (2/2)
CN2341 CN5050 5 13
SWITCH
L5002
FL
LEFT SPEAKER
IC5500
C0JBAB000902
TO MAIN (2/2)
INVERTER GATE (CLOCK GENERATOR)
CN2341 CN5050 4 14
1 X5500 X5501 11 3 1A 5A 2A IC5501 4Y 8 GND 7
C0JBAF000716
D-TYPE FLIP-FLOP
01 1 4,6-11 GND CP1 3 Q5101,Q5102 TO MAIN (2/2)
CN5500 H5801 7,8 CN5500 H5801 4,3
FROM SMPS
CN2341 CN5050 2 16
DC DETECT
SA-AK270EB/EG D-AMP BLOCK DIAGRAM
75
SA-AK270EB / SA-AK270EG
16.5. SMPS & AC Inlet Diagram
T5701
D5802
CN5500
H5802
7,8
SWITCH
CN5802 CN2701* 8,9
TO MAIN (1/2)
CN5500 1
H5801
Q5860
CN5802 CN2701* 5
TO MAIN (2/2)
TO D-AMP
TRANSFORMER TEMP DETECT D5801 SWITCH QR5801 DC DETECT QR5810 INVERTER Q5722 CURRENT LIMITING IC5801 C0DABFC00002 SWITCH MAIN TRANSFORMER
CN5500
H5801
3,4
CN2701* CN5802
10
PC5701
CN2701* CN5802
2
FEEDBACK QR5802 DC DETECT Q5862 Q5861 TRANSFORMER TEMP DETECT
TO MAIN (2/2)
SHUNT REGULATOR
3 A
IC5701 C5HACYY00003
SWITCHING REGULATOR
1
CN2701* CN5802
4
TRANSFORMER TEMP DETECT
C 1
D
Q5803
Q5720 PC5720
6 FB VCC 4
Q5802 FEEDBACK CONTROL
CN2701* CN5802
11
CURRENT LIMITING SWITCH
SWITCH
FEEDBACK
AC INLET CIRCUIT
D5701 F1 L5703 L5701 DZ5701 P5701
T5751
Q5721 AC INLET P.C.B SWITCH
IC5899 C0DAEMZ00001
SHUNT REGULATOR
R C 1
PC5799
3
FEEDBACK IC5799 MIP4110MSSCF
SWITCHING REGULATOR
2 FB S D 7,8 5
SUB TRANSFORMER
VCC
4
Q5898 TO MAIN (2/2)
PC5702 SYNC
CN2701* CN5802
1
INVERTER
SWITCH
SA-AK270EB/EG SMPS / AC INLET CIRCUIT BLOCK DIAGRAM
76
SA-AK270EB / SA-AK270EG
16.6. Deck, Deck Mechanism & USB Diagram
IC1001
LCH
AN7326K
(DECK 1) .B. HEAD
DECK R/P IC
22 19
IC900 IC951
MNZSFB5KJM1
C0DBZYE00002
CN1305 CN2803 8
6,7,8 OUT
VOLTAGE REGULATOR
VDD 2,3
USB CONTROLLER IC
D5V
X900 11 OSC1 12 OSC0 MMOD0 15 NRST 14 CD_NRST 8 CD_MLD 64 STIN 61 STREQ 54 TERR 51 4 USBD6 USBD+ STCLK 59 CD_DATA 58 CD_STAT 57
CTRL
(DECK 2) HEAD
1
15
16
CN1305 CN2803 12
TO MAIN (1/2)
VBUS DD+
1 2 3
4
FLAG
RCH
4
CN1305 CN2803 9
USB CONNECTOR
P903
5
8
7 6 9
CN1305 CN2803 13
CD_CLK 56 I2C_DATA/ERROR 48 I2C_REQ/WR_START 47 VERR 50 I2C_CLK/WR_END 46
P901 CN3200 22 P901 CN3200 19 P901 CN3200 18 P901 CN3200 17 P901 CN3200 16 P901 CN3200 15 P901 CN3200 14 P901 CN3200 13 P901 CN3200 11 P901 CN3200 10 P901 CN3200 8 P901 CN3200 6 P901 CN3200 5 P901 CN3200 4 P901 CN3200 3
TO MAIN (2/2)
L1301
(DECK 2) ERASE HEAD
Q1309,Q1310 BIAS SWITCH
Q1304 REC:H SWITCH
Q1303 SWITCH
CN1305 CN2803 14
Q1317 BEAT PROOF LEVELSWITCH
Q1312 SWITCH
4 2 IC1000 C1AA00000612 3 5
M
Q1316 SWITCH
MOTOR 12V Q1314 SWITCH
CN1305 CN2803 2
ANALOG SWITCH
TO MAIN (2/2)
DECK MECHANISM CIRCUIT
VREF IC971 CNB13030R2AU D971
CS971 CP1902 5 CS971 CP1902 3
Q1315 SWITCH MOTOR 12V MODE HALF RECINH_F
CN1305 CN2803 21 CN1305 CN2803 1
PHOTO INTERUPTOR
VREF S971 S972 S975
VREF-
CS971 CP1902 1 CS971 CP1902 2 CS971 CP1902 6
CN1305 CN2803 4 CN1305 CN2803 6
DECK MECHANISM P.C.B
SIGNAL LINES : MAIN SIGNAL LINE : TAPE PLAYBACK SIGNAL LINE : TAPE RECORD SIGNAL LINE ( ) Indicates the Pin No. of Right Channel. : CD SIGNAL LINE : FM/AM SIGNAL LINE : AUX/MIC/MUSIC PORT SIGNAL LINE : CD-DA SIGNAL LINE : USB SIGNAL LINE
NOTE : Signal Lines are applicable to the Left Channel only.
SA-AK270EB/EG DECK/DECK MECHANISM/USB CIRCUIT BLOCK DIAGRAM
77
SA-AK270EB / SA-AK270EG
78
SA-AK270EB / SA-AK270EG
17 Notes Of Schematic Diagram
(All schematic diagrams may be modified at any time with the development of new technology) Notes: S971: S972: S975: S6100: S6101: S6106: S6108: S6200: S6201: S6202: S6203: S6204: S6205: S6206: S6207: S6208: S6300: S6301: S6302: S6303: S6304: S6306: S6307: S6308: S6820: S7201: VR6500: VR6630: Mode switch. Half switch. RECINH_F switch. ) switch. Power ( Display switch. ) switch. Tape Rec ( D.Bass switch. ) switch. Open/Close ( ) switch. Multi Change ( ) switch. Single Change ( ) switch. CD1 ( ) switch. CD2 ( ) switch. CD3 ( ) switch. CD4 ( ) switch. CD5 ( Stop/Demo switch. ) switch. FWD ( Manual EQ switch. ) switch. REW ( ) switch. Tape ( Tuner switch. ) switch. CD ( ) switch. USB ( Music Port switch. ) switch. Eject ( Rest switch. VR Volume Jog VR Volume Encoder · * FOR INDICATION ONLY. · Voltage and Signal lines: : +B Signal line : -B Signal line : CD DA signal line : CD signal line : Tape Record signal line : Tape Playback signal line : FM/AM signal line : Main signal line : Music Port signal line : USB signal line
· Importance safety notice : mark have special Components identified by characteristics important for safety. Furthermore, special parts which have purposes of fireretardant (resistors), high-quality sound (capacitors), lownoise (resistors), etc. are used. When replacing any of components, be sure to use only manufacturer“s specified parts shown in the parts list. · In case of AC rated voltage Capacitor, the part no. and values will be indicated in the Schematic Diagram. AC rated voltage capacitor: C5700, C5701, C5703, C5704, C5705, C5706, C5707 · Resistor Unit of resistance is OHM [] (K=1,000,000). · Capacitor Unit of resistance is µF, unless otherwise noted. F=Farad, pF=Pico-Farad · Coil Unit of inductance is H, unless otherwise noted.
79
SA-AK270EB / SA-AK270EG
80
SA-AK270EB / SA-AK270EG
18 Schematic Diagram
18.1. (A) CD Servo Circuit
1 2 3 4 5 6 7 8 9 10 11 12 13 14
A
SCHEMATIC DIAGRAM - 1 OPTICAL PICKUP CIRCUIT (FOR REFERENCE ONLY)
W7022 R7601 4.7 LASER DIODE 6 8 1 2 3 11 12 C C 4 5 6 7 8 1 GND NBOUT 8 9 10 2 VCC C 4 9 3 BIN NAOUT 6 GND 7 11 12 13 14 4 AIN VREF 5 C 15 16 C7601 6.3V33 C7670 0.1 C7626 0.1 0 W7020 0 W7019 0 W7018 0
A
CD SERVO CIRCUIT
: + B SIGNAL LINE
: CD DA SIGNAL LINE
: CD SIGNAL LINE
62 14
CN7001
VCC F E LD LD GND GND A GND (GUARD) B 1 2 3 4 5 6 7 8 9
Q7601
W7025 0
B1ADCF000001
LASER POWER DRIVE W7017 0 R7650 5.6 W7023 0 C7613 0.1 C7218 0.082 C7241 1000P 0 0 W7021 W7026 C7217 0 0.1 R7211 82k C7230 0.1 R7212 820 C7614 6.3V100 R7217 1k C7225 1000P C7226 1000P R7221 100 R7218 1k
D7650 MAZ80560ML
62 16
62 19
50V1
B
B
62 18 C7227
C7228 50V1
62 51
(RF) W7014
62 17
VREF 10 LPD 11 GND (GUARD) 12 T13
C7231 6.3V220 W7005 0
C
10 5
T+ 14 F- 15 F+ 16
C
C7244 0.015
62 24
62 13
0 0 LB7263 0 LB7264
2 3
C
VREF
C7203 6.3V220
C7161 0.1 50
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 DQSYTXT ARFIN PLLF0 OUTR OUTL DVSS3 BLKCK MCLK NRST DSLF PLLF FLAG EXT0 EXT1 EXT2 IREF MLD SMCK NSRVMONON AVSS1 AVDD1 MDATA PMCK TX STAT 76
C7263 0.1
W7010 0 C7234 0.1
LB7262
62 28
W7012 0
C7223 50V4.7
C7216 680P
CN7002
22 AGND LCH OUT AGND RCH OUT DGND ST_IN ST_CLK ST_REQ 3.3V DGND LD SW TX 7.5V PGND MCLK MDATA MLD BLKCK STAT RST RESET_SW LOADING 21 20
1
W7009 0
W7016
C7204 0.1
48 ARFDC C7102 0.47 47 AVDD2 46 RFIN [50] ARFFB [49] ARFOUT
DVSS2 78 REGON 79 X2 80 X1 81 NTEST 82 D2 83 D1 84 D0 85
0
0
W7011
0
W7015
49
77
C7235 16V10
W7008 0 C7253 470P W7006 0 W7007 0 W7029 0
19 18 17 16 15 14 13 12 11
D
W7013 C7142 3300P 0
DVDD2 [76] IODD1 [77]
D
62 50
C7107 0.022
45 RFOUT 44 RFENV 43 CENV 42 LD 41 PD 40 A 39 C
62 12
W7028 0 C7243 0.1
TO MAIN CIRCUIT (CN2801) IN SCHEMATIC DIAGRAM - 4
IC7001 MN6627954MA
SERVO PROCESSOR/ DIGITAL SIGNAL PROCESSOR/ DIGITAL FILTER D/A CONVERTER
D3 86 D4 87 D5 88 D6 89 D7 90 D15 91 D14 92 DRVDD 93 C7264 0.1 D13 94 D12 95 R7253 10 C7233 0.1 C7232 6.3V220
10 9 8 7 6 5 4
W7024 0
38 B 37 D 36 F
E
35 E
62 90
GND1 R7327 1k TRV GAIN R7349 18k
34 VREF R7111 10k 33 CTRCRS 32 OSCIN 31 AVSS2
62 8 62 9 62 31 62 4
62 7
E
R7254 1K
62 3
S7201 REST SW
3 2
PRAMVDD33
PRAMVDD15
NRAS
FOP
NWE
TRP
BA1
BA0
A10
PC
A0
A1
A2
A3
A4
A5
A6
A7
A8
FO GAIN
R7328 C7339 0.018
10k
R7214 470
R7339 1k
C7164
PGND1 PGND2
PVCC2
VREF
IN4
D4+
D3+
GND
VCC
D3-
D4-
IN3
NC
NC
NC
NC
F
C7335 0.1
10
15
16
17
18
19
20
21
22
23
24
25
26
27
28
R7330 5.6K
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
A