Disassembly Procedure; Troubleshooting - JBL SOURCE Service Manual

Ò
Dolby Pro-Logic Surround Processor/CD Player/Tuner
1) Lay unit face down. Remove the 5 Phillips screws
holding the upper & lower case together; separate cases.
PROBLEM
DISPLAY BRIGHTNESS
UNEVEN
HUM IN CD MODE
CD PLAY INTERMITTENT -
ONE CHANNEL DEAD
CD PLAY INTERMITTENT
CD PLAY INTERMITTENT -
DISPLAY BLINKING

DISASSEMBLY PROCEDURE

TROUBLESHOOTING

SOLUTION
Cut out R364 & R367 on CONTROL
PCB
(1) Add 470uf 16v Cap. (PRE3952-471)
in parallel with ZD401 on MAIN PCB;
observe polarity (see drawing)
(2) Replace C472 (47uf 16v) with 470uf
16v cap. (PRE3952-471)
Add insulated jumper wire near IC802 on
CD DECODER PCB pin #67 and pad
exiting from corner of IC - ground. (see
illustration)
On MAIN PCB, cut out C721
On CONTROL PCB,
(1) Cut out jumper J015 and R368
(2) Replace existing part Q313 with
2SD882P NPN Transistor
(RHN0882-001)
(3) Solder 2 pcs. Diode IN41418
(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)
(5) R363 insert and solder a 2.2K ohm
resistor (QAF0650-222)
2) Remove as many molex connectors as necessary to
separate case halves; do not mix up connectors during
reassembly. Label if necessary.
1
DELETE
J015 & R368
SOURCE
DETAILS
µ
470 f
16V
ZD401
4
R364 INSERT
2.4K
J004
R362 R362
R363 INSERT
R367 R367
2.2K
R368 ZD906
3
Q313 Q313
1
Q313
2
INSERT
2SD882
Ω
1 / W
4
Ω
1 / W
6
8