Read JBL ESC 350 Source (serv.man2) Service Manual online
8
Dolby Pro-Logic
Ò
Surround Processor/CD Player/Tuner
SOURCE
DISASSEMBLY PROCEDURE
1) Lay unit face down. Remove the 5 Phillips screws
holding the upper & lower case together; separate cases.
holding the upper & lower case together; separate cases.
2) Remove as many molex connectors as necessary to
separate case halves; do not mix up connectors during
reassembly. Label if necessary.
separate case halves; do not mix up connectors during
reassembly. Label if necessary.
TROUBLESHOOTING
PROBLEM
SOLUTION
DETAILS
DISPLAY BRIGHTNESS
UNEVEN
UNEVEN
Cut out R364 & R367 on CONTROL
PCB
PCB
HUM IN CD MODE
(1) Add 470uf 16v Cap. (PRE3952-471)
in parallel with ZD401 on MAIN PCB;
observe polarity (see drawing)
in parallel with ZD401 on MAIN PCB;
observe polarity (see drawing)
(2) Replace C472 (47uf 16v) with 470uf
16v cap. (PRE3952-471)
16v cap. (PRE3952-471)
CD PLAY INTERMITTENT -
ONE CHANNEL DEAD
ONE CHANNEL DEAD
Add insulated jumper wire near IC802 on
CD DECODER PCB pin #67 and pad
exiting from corner of IC - ground. (see
illustration)
CD DECODER PCB pin #67 and pad
exiting from corner of IC - ground. (see
illustration)
CD PLAY INTERMITTENT
On MAIN PCB, cut out C721
CD PLAY INTERMITTENT -
DISPLAY BLINKING
DISPLAY BLINKING
On CONTROL PCB,
(1) Cut out jumper J015 and R368
(1) Cut out jumper J015 and R368
(2) Replace existing part Q313 with
2SD882P NPN Transistor
(RHN0882-001)
2SD882P NPN Transistor
(RHN0882-001)
(3) Solder 2 pcs. Diode IN41418
(RAD4148-001) in parallel with ZD301
(see illustration). Observe all polarities.
(RAD4148-001) in parallel with ZD301
(see illustration). Observe all polarities.
(4) R364 insert and solder a 2.4 ohm
resistor (or two 4.7 ohm [QAF0450-479]
in parallel)
resistor (or two 4.7 ohm [QAF0450-479]
in parallel)
(5) R363 insert and solder a 2.2K ohm
resistor (QAF0650-222)
resistor (QAF0650-222)
470 f
16V
16V
µ
ZD401
R362
J015
Q313
R363
R364
R367
R362
J015
Q313
R363
ZD301
ZD301
R364
R367
R368
1
RB901
RB902
J004
ZD906
R363 INSERT
2.2K / W
Ω
1
6
R364 INSERT
2.4K / W
Ω
1
4
DELETE
J015 & R368
Q313
INSERT
2SD882
1
2
3
4
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