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NorthridgeTM E-Series
Powered Subwoofer

E250P

Service Manual

JBL Consumer Products 250 Crossways Park Dr. Woodbury, New York 11797 Rev2 2/2004

E250P

- CONTENTS BASIC SPECIFICATIONS ......................................1 SAFETY INFORMATION .......................................2 DETAILED SPECIFICATIONS ................................3 CONNECTIONS....................................................4 OPERATION ........................................................7 BASIC TROUBLESHOOTING.................................8 EXPLODED VIEW/PARTS LIST...............................9 TEST SET-UP AND PROCEDURE..........................10 AMPLIFIER BLOCK DIAGRAM...............................11 TECH TIP JBLTT2003-04 .....................................12 DETAILED TROUBLESHOOTING.................... ......13 P.C.B. DRAWINGS...............................................16 ELECTRICAL PARTS LIST ...................................20 IC/TRANSISTOR PINOUTS.....................................24 SCHEMATICS.....................................................25 PACKING...........................................................27

E250P SPECIFICATIONS
Amplifier Power (RMS): Peak Dynamic Power *: Driver: Inputs: Low-Pass Frequency: Frequency Response: Dimensions (H x W x D): Weight: 250 Watts 550 Watts 12" (305mm) PolyPlasTM Line Level (switchable to LFE) and Speaker Level with 5-way binding posts Variable from 50Hz to 150Hz 25Hz ­ Low-pass crossover setting 19-3/4" x 14-3/8" x 16-1/2" (502mm x 365mm x 419mm) 43 lb/19.5kg

JBL continually strives to update and improve existing products, as well as create new ones. The specifications and details in this and related JBL publications are therefore subject to change without notice.
* The Peak Dynamic Power is measured by recording the highest center-to-peak voltage measured across the output of a resistive load equal to minimum impedance of the transducer, using a 50Hz sine wave burst, 3 cycles on, 17 cycles off.

1

E250P

SAFETY INFORMATION
Warning
Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock. Therefore, any service procedures are to be performed by qualified service personal ONLY!

List of Safety Components Requiring Exact Replacements

Part Number/ Designator F1 093-105202-300 083-041802-009

Description Line Fuse Slo Blo 2.0A 5x20mm 250V UL approved SPT-2 or better with polarized plug, UL approved wired with the hot side to fused side. Use with factory replacement panel strain relief (70305) only. Power Transformer. Use only factory replacement. Bridge diode. Use only factory replacement. 3300uF 80V electrolytic filter caps. Be sure replacement part is at least the same working voltage and capacitance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration. Rear Amp Cover Use only factory replacement L1 - Use only factory replacement L2 - Use only factory replacement L3 - Use only factory replacement L4 - Use only factory replacement

Caution
Early revisions of the unit did not have a power switch. Hazardous voltages are resent within the unit whenever it is plugged in. Before amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is plugged in. Do not exceed rated voltage by more than 10%: operation below 90% of rated voltage will cause poor performance or may shut the unit off.

PT1 042-010053-003 BR1 052-400080-000

Leakage/Resistance Check
Before returning the unit to the customer, perform a leakage or resistance test as follows: Leakage Current. Note there is no power switch on early revisions of this unit. When the power plug is plugged in, the unit is live. Connect the unit to its rated power source. Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test. If leakage current exceeds 0.5mA, the unit is defective. Reverse the polarity of the AC supply and repeat. Resistance. Measure the resistance from either side of the line cord to chassis ground, If it is less than 500k ohms, the unit is defective. WARNING! DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected.
C6,8 034-330780-300

063-531808-000 Inductor 043-560200-000 Inductor 043-300101-000 Inductor 043-700101-000 Inductor 043-324300-000

Critical Components
All components identified with the IEC symbol in the parts list and schematic diagram designate components in which safety can be of special significance when replacing identified with. Use only the replacement parts designated in the parts list or parts with the same rating of resistance, wattage or voltage.

2

E250P
JBL E250P Powered Sub/ Plate Amp
LINE VOLTAGE US 120vac/60Hz EU 230vac/50-60Hz Yes/No Yes Yes Hi/Lo Line 108-132 207-264 Nom. 120 230 QA Test Limits n/a n/a 140 130 225 1 0.5 30 35 50 ±2dB ±2dB ±2dB 70 70 60 2 2 n/a n/a Unit Vrms Vrms Notes Normal Operation Normal operation, MOMS required

Parameter Specification Amp Section Type (Class AB, D, other) D Load Impedance (speaker) 5.6 150 Rated Output Power (120VAC 150 Rated Output Power (230VAC AVG RMS Dynamic Power THD @ Rated Power THD @ 1 Watt DC Offset Damping factor Input Sensitivity Input Frequency L&R LFE input Speaker/Hi Level Input Signal to Noise SNR-A-Weighted SNR-unweighted SNR rel. 1W-unweighted Residual Noise Floor Residual Noise Floor Input Impedance Line Input (L, R,LFE) Speaker/Hi Level Input Filters LP filter 4th order fixed Subsonic filter (HPF) 3rd Orde LFE Low pass 2nd order HP speaker out connector Note: 120V Models do not have speaker output Limiter THD at Max. Output Power Features Volume pot Taper (lin/log) Phase switch LP Filter defeat switch Input Configuration Line In (L,R) & LFE Spkr/Hi Level In Signal Sensing (ATO) Auto-Turn-On (yes/no) ATO Input test frequency ATO Level LFE Input ATO Level Speaker in ATO Turn-on time Auto Mute/ Turn-OFF Time Power on Delay time Transients/Pops ATO Transient 60-180 Hz Fixed 200>LP<1K Hz 200 Hz 100 Hz n/a -LOG 0-180 YES 250 0.3 0.1 10 >50 50 240 240 2.4 90 85 65 1

Unit n/a Ohms Watts Watts Watts % % mV-DC DF Hz mVrms mVrms Vrms dBA dBr dBr mVrms

Conditions

Notes

Nominal

Domestic version only 120 VAC-60 Hz EU Version only 230 VAC-50 Hz Average RMS power, 3/20 Cycles 50 Hz, Driven 6dB above its input sensitivity sensitivity 145 Watts Measured at the speaker cable. 150 Watts @ THD < 0.1 % @ 50 Hz

22k filter 22k filter @ Speaker Outputs Measured at amplifier board Nominal Freq. To 150 Watts To 150 Watts To 150 Watts relative to rated power relative to rated power relative to 1W Output Volume @max, using RMS reading DMM/VOM (or A/P) BW=20 Khz. Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics) (BW=20 Khz) Nominal Nominal

Single input driven Single input driven, LFE switch ON Single input driven A-Weighting filter 22k filter 22k filter Line level inputs must be terminated using 1KOHM Line level inputs must be terminated using 1KOHM

1.5 mVrms(max) 10K > 4.7K ohms ohms

± 10

2nd order variable + 2nd order fix-24 db/Octave LFE input driven only Speaker input driven - Speaker out loaded with 4 Ohms (Applies only to 230V Model) Speaker input driven - Speaker out loaded with 8 Ohms (Applies only to 230V Model) Maximum THD as a result of limiting. A Taper Disables LP filter, intended for LFE
Dual RCA jack

± 10 ± 10 n/a -deg

functional Maximum Output Power functional functional functional
functional

YES

YES

--

--

functional functional functional functional functional

Binding post connector L&R

YES 50 4 50 5 15 3 5

Hz mV mV ms minutes sec. mV-peak

" " " Amp connected and AC on, then functional input signal applied T before muting, after signal is 15 removed 4 n/a AC Power Applied @ Speaker Outputs

Maximum acceptable level. Maximum acceptable level. Auto turn of time (T) must be 5 > T < 15 Minutes

3

E250P
Parameter Turn-on Transient Turn-off Transient Efficiency Efficiency Stand-by Input Power Power Cons. @ rated power Protections Short Circuit Protection YES Specification 50 50 65 24 234 Unit mV-peak mV-peak % Watts Watts QA Test Limits Conditions 2v-pp @ Speaker Outputs 2v-pp @ Speaker Outputs 64 26 240 @ nom. line voltage @ nom. line voltage Notes AC Line cycled from OFF to ON AC Line cycled from ON to OFF Nominal Line voltage 120 VAC Maximum allowable input power under nominal Input voltage and frequency, HOT or COLD operation. 150 Watts @ 5.6 Ohms nominal line voltage

functional Direct short at output

Thermal Protection DC Offset Protection Line Fuse Rating USA-Domestic EU

YES YES 2 1.25 Amps Amps

Amplifier should resume operation after short circuit condition removal Temperature rise in accessible metal parts should not exceed 35K rise for domestic version @1/8 max unclipped Power at 1.06 or 30K rise for European versions (refer to requirements sheet). functional times the input voltage Design must insure no Offset at the speaker output under any operating condition including abnormal operation DC present at Speaker Out leads 2 1.25 Type-T or Slo Blo-250 V Type-T or Slo Blo-250 V, Low Breaking capacity Internal fuse with UL/SEMKO rated holder Internal fuse with UL/SEMKO rated holder

4. ALL SPECS SHOULD BE MEASURED AT NOMINAL LINE VOLTAGE.

SPEAKER CONNECTION
When we designed the E150P and E250P powered subwoofers, our goal was to offer the user the best possible performance combined with the most flexible and complete installation options. Please look over the following three examples to determine which description best matches your system and follow the corresponding hookup instructions. To use the binding-post speaker terminals with bare wire, unscrew the collar until the hole through the center post is visible under the collar. Insert the bare end of the wire through the hole in the post, then screw the collar back down until the connection is tight. The holes in the center of the collars are intended for banana-type connectors. Speakers and electronics terminals have corresponding positive (+) and negative (­) terminals. It is important to connect both speakers identically: positive (+) on the speaker to positive (+) on the amplifier and negative (­) on the speaker to negative (­) on the amplifier. Wiring "out of phase" results in thin sound, weak bass and a poor stereo image. NOTE: The speaker-level connection method described on
the next page is not a preferred connection

and should only be resorted to if your receiver/ processor does not have a line-level or subwoofer output. The customer is responsible for proper connections, and any damage to JBL or other equipment due to improper connections will not be covered by your JBL warranty. Consult with your JBL dealer or an audioinstallation expert if you have any questions about how to connect your subwoofer using the speaker-level inputs.

4

E250P
Analog Receiver/Processor ­ Speaker-Level Connections
Use this installation method only with an analog receiver/ processor that does not have digital processing or bass management, and also does not have a subwoofer output or a volume-controlled preamp (line-) level output: Connect the speaker wires for both your main left and right speakers, and for the subwoofer, to the same speaker terminals on your receiver or amplifier. The wires may be joined by twisting together the bare ends of the two leads that will be connected to each terminal on the receiver/ amplifier, as shown in the diagram. This procedure should be done only four times (involving a total of eight barewire ends), and only for those wire ends that are being connected to the terminals on your receiver/amplifier. It is important that you avoid joining any other wires. Do not twist together wire ends that are being inserted into terminals on any speaker or on the subwoofer. Do not twist together wire ends that will be used for any speakers other than the front left and right speakers or the subwoofer. Refer to the connection diagram for guidance. Twist together the (+) leads at one end of the speaker wires that you have designated for the left front speaker and for
To (+) terminal on left speaker To (+) terminal of left input on subwoofer

the left high-level inputs on the subwoofer. Insert the joined (twisted) wires into the left front (+) terminal on your receiver/amplifier. Connect the free end of the (+) lead for the left front speaker to the (+) terminal on the back of the speaker. Connect the free end of the (+) lead for the left input on the subwoofer to the left binding-post terminal. Repeat this process for the (­) connections for the left front
Left Front

speaker and left input on the subwoofer, and then for the (+) and (­) connections for the right front speaker and right high-level inputs on the subwoofer. Connect your receiver or amplifier's center and surround speaker terminals to the corresponding terminals on the back of your center and surround speakers.

+

­

Center

Right Front

+

­

+

­

Subwoofer
L
HIGH LEVEL IN

+
Left Front

­
Receiver
Center

R

Right Front

+

­
Twist Here

+

­
Twist Here

+

­

Left Surround

Right Surround

+

­

+

­

Left Surround

Right Surround

+

­

+

­

To front left (+) terminal on receiver/amplifier

5

E250P
Analog Receiver/Processor ­ Line-Level Connections
Use this installation method with an analog receiver/ processor that does not have digital processing or bass management, and that is equipped with a full-range subwoofer output or a volumecontrolled preamp (line-) level output: Use RCA-type interconnect cables to connect the linelevel subwoofer outputs on your receiver or amplifier to the line-level inputs on the subwoofer. IMPORTANT: Make sure that the LFE toggle switch on the subwoofer is in the "Normal" position. Do not use the "LFE" position with Dolby* Pro Logic*-only processors. Note: If your receiver or amplifier has only one subwoofer output jack, then you may connect the subwoofer output on your receiver/preamplifier to either the left or right line-level input on the subwoofer. It makes no difference which jack you choose. Connect each speaker to the corresponding speaker terminals on your receiver or amplifier. Make sure your receiver or processor is configured so that the subwoofer is "On."
RECEIVER Subwoofer Out

LEVEL
Min Max

LFE

NORMAL

PHASE

0º

180º

CROSSOVER FREQUENCY
50Hz 150Hz

L

R
LINE LEVEL IN

L

R

Note for advanced users: If your receiver/ processor has a built-in lowpass crossover filter for the subwoofer output, then the LFE switch should be set to the "LFE" position to bypass the subwoofer's internal crossover.

For LFE use L or R

L
HIGH LEVEL IN

+ ­

R

Digital Receiver/Processor ­ LFE Connection
Use this installation method for Dolby Digital, DTS® or other digital surround processors that have bass-management programming, or for analog receivers/processors that have a filtered subwoofer output: IMPORTANT: Make sure that the LFE toggle switch on the subwoofer is in the "LFE" position. Use the line-level input jacks for the LowFrequency Effects channel. Connect these jacks to the LFE output or subwoofer output on your receiver or amplifier. Note: If your receiver or amplifier has only one subwoofer output jack, you may connect the subwoofer output on your receiver/preamplifier to either the left or right line-level input on the subwoofer. It makes no difference which jack you choose. Connect each speaker to the corresponding speaker terminals on your receiver or amplifier. Make sure that you have configured your surround sound processor for RECEIVER/PREAMPLIFIER "Subwoofer On" or Subwoofer Output/LFE "LFE On." The front, center and surround speakers should be set to "Small" or "Large" depending on their size and frequency response. Consult your receiver's or processor's owner's manual.
CROSSOVER FREQUENCY
50Hz 150Hz

LEVEL
Min Max

LFE

NORMAL

PHASE

0º

180º

L
LINE LEVEL IN

R

For LFE use L or R

L
HIGH LEVEL IN

+ ­

R

6

E250P
OPERATION
Power
When the unit is plugged in and the power switch is on and no signal is received, the LED on the top of the unit will turn red. When a signal is present, the LED will turn green. Note: It will take several minutes for the LED to turn from green to red after the input signal to the subwoofer is removed. Due to JBL's unique high-output, high-efficiency amplifier design, power consumption is minimal when the subwoofer is not receiving a signal. Of course, the subwoofer can be turned off, whenever desired, if you do not wish to leave it in auto (standby) mode.

Level Control
The subwoofer Level Control adjusts the volume of the subwoofer relative to the rest of the system. Proper level adjustment depends on several variables such as room size, subwoofer placement, type of main speakers and position. Adjust the subwoofer level so that the volume of the bass information is pleasing to you.

Crossover Adjustments
The Crossover Frequency Control determines the highest frequency at which the subwoofer reproduces sounds. If your main speakers can comfortably reproduce some lowfrequency sounds, set this control to a lower frequency setting, between 50Hz and 100Hz. This will concentrate the subwoofer's efforts on the ultradeep bass sounds required by today's films and music. If you are using smaller bookshelf speakers that do not extend to the lower bass frequencies, set the low-pass crossover control to a higher setting, between 120Hz and 150Hz. This control is not used when the LFE switch is in the "LFE" position.

7

E250P
Phase Control

The Phase Control determines whether the subwoofer's piston-like action moves in and out in phase with the main speakers or opposite the main speakers. There is no correct or incorrect setting. Proper phase adjustment depends on several variables such as subwoofer placement and listener position. Adjust the phase switch to maximize

bass output at the listening position. Remember, every system, room and listener is different. There are no right or wrong settings; this switch offers the added flexibility to adjust your subwoofer for optimum performance for your specific listening conditions without having to move your speakers.

If at some time in the future you happen to rearrange your listening room and move your speakers, you should experiment with the phase switch in both positions, and leave it in the position that maximizes bass performance.

TROUBLESHOOTING
If you used the high-level (speaker) inputs and there is no sound from any of the speakers: · Check that the receiver/ amplifier is on and a source is playing. · Check that the powered subwoofer is plugged into an active electrical outlet and is switched on. · Check all wires and connections between the receiver/ amplifier and the speakers. Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured, or touching each other, except for the wires for the front left and right speakers, which may be joined with the wires for the subwoofer at the receiver/ amplifier end only, if you are using the speaker-level connections as described on page 4. · Review proper operation of your receiver/amplifier. If there is low (or no) bass output: · Make sure the connections to the left and right "Speaker Inputs" have the correct polarity (+ and ­). · Make sure that the subwoofer is plugged into an active electrical outlet and switched on. · Adjust the crossover point. · Flip the Phase Control switch to the opposite position. · If you are using a Dolby Digital/DTS receiver or processor, make sure that the subwoofer adjustments on the receiver/processor are set up correctly. · Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass. If you used the line-level inputs and there is no sound from the subwoofer: · Check that the receiver/ amplifier is on and a source is playing. · Check that the powered subwoofer is plugged into an active electrical outlet and is switched on. · Check all wires and connections between the receiver/amplifier and the subwoofer. Make sure all wires are connected. Make sure none of the wires are frayed, cut or punctured, or touching each other. · Review proper operation of your receiver/amplifier. · Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass. · Make sure that you have configured your receiver/ processor so that the subwoofer/LFE output is on.

8

Exploded View
14

E250P

15

6

7

10

Amplifier ­ Not for Sale

17

11

16

12

8

9 13

Ref# 6 7 8 9 10 11 12 13 14 15 16 17

Part Number 351348-001 338125-002 336486-001 763-31110-40 908302-012 903802-016 338128-002 336799-001 351307-001 333249-003 333249-001 351243-001 903401-012

Description PLATE,LED/LOGO-E250P ASY,LED-E250P/E250P ASY,FOOT,PLSTC- E250P SCREW, 8 X 2 1/2,TR,PH,PB,BLK ZINC,LCS (FOOT) SCREW, PB,HXS,#6x.75,ZINC (LOGO PLATE) SCREW, PB,HXS,#8x1",ZINC (WOOFER) ASY, WOOFER,12" DCR 4.8 ASY, PORT TUBE GRILLE, BLK, FRNT CUP,GRILLE,TITANIUM, (BEECH MODEL) (CHERRY MODEL) CUP,GRILLE (BLACK MODEL) RING,TRIM,12"-E250P SCREW, 6 X 3/4,PAN,PH,PB,BLK ZINC,LCS (AMPLIFIER)

Qty 1 1 4 4 4 8 1 1 1 4 4 1 10

E250P

TEST SET-UP AND PROCEDURE

General Function UUT = Unit Under Test
1) Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. LEVEL control should be full counterclockwise (MIN). Make sure the LFE/Normal switch is in the NORMAL position. 2) Turn on generator, adjust to 100mV, 50Hz. 3) Plug in UUT; Turn Main Power switch ON. LED's on the top panel may be either Red or Green. Turn LEVEL control full clockwise (MAX). Low Pass control should be set fully clockwise (150Hz). 4) LED should turn Green; immediately bass response should be heard and felt from port tube opening. 5) Turn off generator, turn LEVEL control fully counterclockwise (MIN), disconnect RCA cables. 6) Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator. 7) Turn on generator and adjust so that speaker level output is 1.0V, 50Hz. Turn LEVEL control full clockwise (MAX). 8) Green LED should light, immediate bass response should be heard and felt from the port tube opening.

Sweep Function
1) Follow steps 1-4 above, using a sweep generator as a signal source. 2) Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.

Driver Function
1) Remove driver from cabinet; detach + and - wire clips. 2) Check DC resistance of driver; it should be 4.8 ohms. 3) Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5.0V. 4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.

10

E250P

11

E250P

TECH TIPS
Troubleshooting tips and solutions to common service problems For models: E150P,E250P and PB10,PB12 (Revision 2) * TIP# JBLTT2003-04 Rev1

Subject: Replacing MOSFETS Q18, Q22
In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use ONLY the JBL part# FE106401110 or only the brands: International Rectifier, or Fairchild. Replace both Q18 and Q22 MOSFET's in the circuit, even if only one seems to be damaged. Do NOT mix & match these components from different manufacturers, or batches. They should be identical.

* Late version PB10 or PB12 subwoofers (Revision 2 in the service manual) can be identified by:
· · · · Amplifier serial number starts with "HA" Output transistors in the open, on a large black heatsink Large plastic cup enclosing the rear of the amp assembly Main PCB, bottom, solder-side contains all SMD devices

.

12

E250P

DETAILED TROUBLESHOOTING
A. Power Amp Section Resistance Check
Resistance from S+ (SPK O/P) to GND should be >1M (NO LOAD) Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k Resistance from V+ (C6 P+) to S+ (SPK O/P) should read >1M Resistance from V- (C8 P-) to S+ (SPK O/P) should read >1M

2. Power Up LED RED With a 5mV signal to Low level input, LED should change to GREEN -Voltage measurements (DVM) OP AMP P-U4(1) P-U4(7) 0Vrms 11.84VDC 7.13Vrms -12.93VDC

LED RED GREEN 3. D.C. Operation

-Voltage measurements (DVM) on CLASS D POWER AMP
Between And This Point Get this Reading V+ GND 71.7V Q4(E) V0V Q1(C) GND -71.7V
Q10(C)

U7(1) GND -71.7V

U7(2) GND -71.5V

U7(4) GND -71.2V

U7(6) GND 0V

U7(7) GND 0V

U7(8) GND 4.65V

GND 0V

4. Check Switching Frequency · · Oscilloscope - USE THE PROBE TIP TO U6(7) TO GND Reading 100kHz +/-10%,24Vp-p

B. Pre Amp Section Line Level Input Sensitivity -Set up Turn level, X'OVER FREQ POT Fully CW and LFE switch off Generator Set at 200mV@50Hz Signal to Line level input

13

E250P

DETAILED TROUBLESHOOTING (CONT'D)

- Voltage measurements OP AMP U3(1)
628mV

U2(1)
306.9mV

U2(14)
461mV

U2(8)
460mV

U3(7)
658mV

U3(14)
598mV

U3(8)
2.326V

U5(7)
2.02V

U5(1)
3.57V

SPEAKER O/P
23.33V

2. High Level Input Sensitivity -Set up Turn level, X'OVER FREQ POT Fully CW and LFE switch off Set Generator at 1.3V@50Hz Signal to High level input -Voltage measurements 15.3V at speaker output 3. Low-Pass -Set up Set Generator at 200 mV@100Hz Signal to Line level input Measure voltage at S+ speaker output

-Voltage measurement X'OVER FREQ. Setting CW CCW 4. LFE -Set up Set Generator at 200mV@200Hz Signal to Line level input Measure voltage at S+ speaker output Output 6V 18.32V Output 14.03V 4.8V

LFE switch Setting Normal LFE

See flow chart next page for diagnostics.

14

E250P

DETAILED TROUBLESHOOTING (CONT'D)
FLOW CHART

CAUTION : SPEAKER OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT TO GROUND. ALL TEST INSTRUMENTS CONNECTED TO THE OUTPUT MUST BE FLOATING. ATTACH THE SCOPE PROBE TIP TO S - and REFERENCE LEAD TO S+.

(A 10mV signal may need from the input to trigger the Switch turn on) START

Resistance check (no load) between V+ V-, V+ O/P,V- O/P and O/P to GND is > 10K

Check +/-15V-MOD +/-15V voltage at U 6(8),U6(4) Check FB1,FB2,C45, C50,C60,C63, R81,R82

no no
OK

Replace Q18,Q22

OK

yes yes
Power up with no signal input LED RED I/P:10mv/50HZ Check +15V/SW Q4(E) TO V15V

no no
OK

yes
Check Q4(E) TO V= 0V D.C.

Discharge C37, Check fuse transformer, L4, rectifier, C6 and C8

Check
OK MUTE(-12.9V),

yes Check U7(1) = -58.3V

And Q24,Q25,Q26

no no
OK

Check MUTE(+8V) and Q24,Q25,Q26

OK

yes Use scope to check O/P U7(6) and GND 143Vp-p square wave shown

Check U7,Q16,Q17, Q20,Q21,R87, D26,D35,C64

yes Use scope to check switching frequency U6(7) 100KHz +/-10% , ~24Vp-p

no
OK

no
OK

yes yes Check L2,L3,C71,C72, C73,C74

CLASS D AMP OK END

15

E250P

16

E250P

17

E250P

18

E250P

19

E250P
E250P Electrical Parts List
Part Number Resistors 020-220497-120 021-100401-120 021-120403-020 021-120405-020 021-220202-120 022-500003-020 024-000098-120 024-100298-120 024-100398-120 024-100498-120 024-100598-120 024-100698-120 024-110598-100 024-120698-120 024-121598-100 024-137698-100 024-150498-120 024-180598-120 024-187698-100 024-200598-120 024-220398-120 024-220498-121 024-220598-120 024-220798-120 024-237598-120 024-243698-100 024-270498-120 024-300398-120 024-300598-120 024-330498-120 024-330598-120 024-332498-100 024-360498-120 024-390498-120 024-390598-120 024-430498-100 024-453598-100 024-470298-120 024-470398-120 024-470498-120 024-470598-120 Carbon Film MOF Resistor MOF Resistor MOF Resistor MOF Resistor KNP Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor 2K2 1/4W J 1K 1W J 1K2 3WS J 8x20 1K2 5WS J 8x25 22R 2W(S) J MB TYPE 15x8 0R05 3WS J FK TYPE 0R 1/8W J 0805 10R 1/8W J 0805 100R 1/8W J 0805 1K 1/8W J 0805 10K 1/8W J 0805 100K 1/8W J 0805 11K 1/8W F 0805 120K 1/8W J 0805 12K1 1/8W F 0805 137K 1/8W F 0805 1K5 1/8W J 0805 18K 1/8W J 0805 187K 1/8W F 0805 20K 1/8W J 0805 220R 1/8W J 0805 2K2 1/8W J 0805 22K 1/8W J 0805 2M2 1/8W J 0805 23K7 1/8W F 0805 243K 1/8W F 0805 2K7 1/8W J 0805 300R 1/8W J 0805 30K 1/8W J 0805 3K3 1/8W J 0805 33K 1/8W J 0805 3K32 1/8W F 0805 3K6 1/8W J 0805 3K9 1/8W J 0805 39K 1/8W J 0805 4K3 1/8W F 0805 45K3 1/8W F 0805 47R 1/8W J 0805 470R 1/8W J 0805 4K7 1/8W J 0805 47K 1/8W J 0805 R11 R103 R9 R6 R10 R104 R125,126 R81,82 R62 R79,83,92,95,96,105,108,127,65 R2,17,19,37,54,58,63,71, R3,112,22-25 R98 R39 R38 R32 R67,68 R29 R45 R94 R90 R1,87,61 R118 R80,121 R48 R36 R73,64 R55 R56 R7,8,12-15,59 R4,5 R26,27, R28 R93 R77 R78 R30 R101,102 R76,99,100 R85,86 R44,47,49,107 1 1 1 1 1 1 2 2 1 9 8 6 1 1 1 1 2 1 1 1 1 3 1 2 1 1 2 1 1 7 2 2 1 1 1 1 1 2 3 2 4 Description Reference Designator Qty

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E250P
Part Number 024-470698-120 024-470798-120 024-487498-100 024-510398-120 024-560598-120 024-620398-100 024-680498-120 024-680598-120 024-820598-120 025-010300-000 026-200595-269 026-500495-252 Capacitors 031-100244-100 031-100343-100 031-100344-100 031-220344-100 031-330444-300 031-470244-102 031-560243-100 031-560343-102 032-100484-200 033-470444-270 033-680464-270 034-100525-300 034-100625-300 034-220525-301 034-220615-301 034-330525-300 034-330615-300 034-330780-300 034-470415-301 034-470615-301 038-100363-300 038-150393-300 038-330393-300 039-100384-100 Semiconductors 051-000600-100 051-003100-000 NPN Transistor NPN Transistor PN:MPSW06RLRA TO-92 (ON) PN:TIP 31C TO-220 (MOSPEC) Q2,Q16 Q4 2 1 Ceramic Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor SMD Capacitor Mylar Capacitor NPE Capacitor NPE Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor MPE Capacitor MPE Capacitor MPE Capacitor Safety Capacitor 0u01/50V K 0805 X7R 100pF/50V J 0805 NPO 0u1/50V K 0805 X7R 0u1/250V K 1206 X7R 220pF/50V J 0805 NPO 3300pF/50V K 0805 X7R 0u047/50V K 0805 X7R 56pF/50V J 0805 NPO 560pF/50V J 0805 NPO 1uF/250V K P:15 4u7/50V K10 (R)8x13 SBE 6u8/100V K10 (R)1020 GNE 10uF/25V M (R)0511 P:5 100uF/25V M (R)6.3x11 P:5 22uF/25V M (R)5x11 P:5 220uF/16V M (R)0611 P:5 33uF/25V M (R)0511 P:5 330uF/16V M (R)0812 P:5 3300uF/80V M (R)22x48 4u7/50V M (R)0511 P:5 470uF/16V M (R)0812 P:5 0u1/100V J 0u15/63V J 0u33/63V J C33,45,51,66,67,5,10 C36,58,16 C11,42-44,46-49,52,54,55,60,63,71,74,77 C3,7 C20,21,19,14,15 C40,34 C62,59 C57,61 C56 C70,C70B C73 C72 C35 C64 C4,9,41,39,50,53 C37 C1 C12,78 C6,8 C2 C65 C68,69,26,27,28,29,30 C25 C31 7 3 16 2 5 2 2 2 1 2 1 1 1 1 6 1 1 2 2 1 1 7 1 1 1 SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor SMD Resistor Thermister Freq Pot 20K Level Pot 5K Description 470K 1/8W J 0805 4M7 1/8W J 0805 4K87 1/8W F 0805 510R 1/8W J 0805 56K 1/8W J 0805 620R 1/8W F 0805 6K8 1/8W J 0805 68K 1/8W J 0805 82K 1/8W J 0805 TSE-103 K L:50mm PN:RD163121R03D-20KBx2(EJ) PN:RK163111R52B-5KA (EJ) VR2 VR1 Reference Designator R70 R60 R51,53 R57 R122 R16,18 R46,91,40,41,43,42 R33,34,31,50,52,66 R69 Qty 1 1 2 1 1 2 6 6 1 1 1 1

031-100384-100R SMD Capacitor

PN:HQX0.1K275VACx2 18x6x12mm CXAC1

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E250P
Part Number 051-005600-100 051-222200-100 051-290700-100 051-540101-000 051-555100-000 051-640001-000 052-400080-000 053-211100-000 054-000100-100 054-001002-100 054-001501-100 054-007200-100 054-007400-100 054-011400-100 054-033904-100 054-033906-100 054-045580-100 054-050601-100 054-414803-100 054-540100-100 054-555100-100 050-505200-001 Miscellaneous 065-050400-000 065-100200-000 082-022640-000 091-000182-000 044-100100-000 041-115001-000 042-010053-003 043-300101-000 043-324300-000 043-560200-000 043-700101-000 008-001008-062 008-002007-033 008-061215-000 008-062002-002 008-062002-012 008-063208-000 008-069304-000 061-020000-000 061-314002-000 Sleeve UL Sleeve Wire Set #26 UL1007 LED Holder SMD Ferrite Bead Bead Coil Transformer Inductor Inductor Inductor Toroidal Inductor Label Label Gasket C4305 Gasket Gasket (PB10/12) Gasket C4305 Gasket C4305 Knob ABS Strain Relief 3.5mm BLK F32 (125 ) 2.5 F32-2.5(blk) 125 L=400mm blk/wht 2P Housing +5TT PN:LED5-2A PN:321611 600R/100MHz 1206 YT-10911 YT-10615-4 30uH YT-10033 324uH YT-10778 56uH YT-10779 70uH YT-10682 97x74.8 t=0.254mm 200.3x71.1 t=0.254mm 12x15 t=5mm CR PN:L-32 200x20mm t=5mm PORON 200x20mm t=2mm CR4305 321x8 t=1mm CR 93x4 t=1mm CR 20x15m/m UL94V-0 BLK P/N SB4F-2 L5 PT1 L2 L4 L1 L3 1 1 1 1 1 1 PNP Transistor NPN Transistor PNP Transistor PNP Transistor NPN Transistor MOSFET N-Channel Bridge Regulator IC;DIP,Driver SMD Diode SMD Zener Diode SMD Zener Diode Description PN:MPSW56RLRA TO-92 (ON) PN:MPS2222ARLRA TO-92 PN:MPS2907A RLRA TO-92 PN:2N5401 TO-92 PN:2N5551 TO-92 PN:IRF640N TO-220 (IR) PN:RS804 400V,8A PN:IR2111 Half-Bridge Driver PN:ES1D 200V 1A PN:BZX84C10 10V SOT-23 PN:BZX84C15 15V SOT-23 Reference Designator Q3 Q21 Q19,23 Q1 Q17 Q18,22 BR1 U7 D5,26,29,33,38 D35 D6,7,9 U5,6 U2,3 Q7 Q11,14,13,5,8,9 Q6,10,12,15 U4 D24,36,37 D1-4,8,10-23,27,28, Q20,24,26 Q25 D1B Qty 1 1 2 1 1 2 1 1 5 1 3 2 2 1 6 4 1 3 21 3 1 1

SMD IC; (Dual OP-Amp) PN:TL072CDR SO-8 (TI) SMD IC;(Quad OP-Amp) PN:TL074CDR (TI) SMD Transistor SMD Transistor SMD Transistor SMD ZENER DIODE SMD DIODE SMD Zener Diode SMD Zener Diode LED PN:DTC114TKA SMT3 PN:MMBT3904LT1 SOT23 PN:MMBT3906LT1 SOT23 PN:BZX84C5V6 5.6V SOT-23 PN:LL4148 (Wishay) PN:MMBT5401 LT1 SOT-23 PN:MMBT5551 LT1 PN:LT-2402-21

SMD IC; (Dual OP=Amp) PN:NJM4558M-TE3 DMP-8

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E250P
Part Number 061-400014-000 061-700044-000 063-010012-000 063-321100-001 063-531808-000 066-120300-900 071-100608-100 071-100851-000 072-010007-000 072-040039-000 072-040064-000 072-040096-000 072-040169-000 072-060170-000 073-032315-601 073-050001-000 074-020018-000 074-030002-000 074-300018-000 082-022241-001 083-041802-009 093-105202-300 181-911600-161 181-911655-135 181-921600-000 181-921699-000 Rubber Foot Mycar Brckt for pwr transistor Plate Bucket Cable Tie Fiber Washer Washer RCA Jack Terminal Terminal Terminal T187MA Connector B.P. Black Anodized Fuse Clip Rocker SW Toggle SW Relay Wire set #22 UL1007 Power Cable Fuse Wire #16AWG UL1007 Wire #16AWG UL1007 blk wire #16 UL1015 wht wire #16 UL1015 Description ID:6.2 OD:11.5 t=2mm blk 13x18mm TO-220 P/N:TRK-1 322x105.7x15mm BLK (94V0)ABS 322x105.7x146.5mm blk (94VO) CV-120S OD=8mm ID=3.2 t=1 (red) ID=5.1 OD=12 t=1m/m SCJ-1020 2P(G) wht, red PC205 (t=0.8m/m) T205MA PC250(t=0.8),T250MA (t=0.8mm) PC187(0.8) 2 PIN JS-1001-2 P:2.5mm W / Accessory Parts 70x58x20mm P/N:CFFH1206 PN:RF1003-BB4-0 PN:L101-T2B4QE PN:943-1C-48D L=410mm blk/wht SPT-2 blk T187 FUSE:2A,250V,5*20mm blk L=610mm green L=610mm T187 L:140mm T187 L:160mm F1 1 SW5,SW6 K1 2 1 AC1,AC3,T1,T2,AC2,SW2,SW4 Reference Designator Qty

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E250P

Semiconductor Pinout Diagrams
2N5401 Q1
3 Collector 2 Base
1. G 2. D 3. S

OPAMP, QUAD TL074CDR U2, 3

MOSFET IRF640 Q18, 22

1

1 Emitter

2

3

MPSW06RLRA, MPSW56RLRAMPQ, MPS2222ARLRA, 2N2907A, 2N5551, Q2, 16, 3, 21, 19, 23, 17
3 Collector 2 Base

1

2

3

OPAMP, DUAL TL072CDR SO-8, NJM4558M-TE3 U5, 6, 4

TIP31C Q4

1

1 Emitter

2 3

BEVEL

MMBT3904LTI SOT23, MMBT3906LTI SOT23, DTC114EK SMT3, MMBT5401 LTI, MMBT5551 LTI Q11, 14, 13, 5, 8, 9, 6, 10, 12, 15, 7, 20, 24, 26, 25

B

C

E

IR2111 HALF-BRIDGE DRIVER U7

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E250P
SCHEMATICS

NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND

NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND

25

NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND

E250P

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Packaging

E250P

1

5

3

14 2

4
Ref# 1 2 3 4 5 14 Part Number 351249-002 351249-001 351249-003 350884-003 351252-001 351252-002 338381-001 352024-001 Description MANUAL, OWNER-E250P/E250P CARTON,MASTER-E250P (BEECH MODEL) CARTON,MASTER-E250P (BLACK MODEL) CARTON,MASTER-E250P (CHERRY MODEL) PAD,END,TOP-E250P PAD,END,BOT-E250P WARRANTY CARD,1/5YR,JBL ASY, GRILLE, BLK, FRNT Qty 1 1 1 1 1 1 1 1

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