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CHECKING THE POWER P.C.B.
Disconnect all Power P.C.B. connector cables, then remove Power P.C.B. from the unit.
Refer to Power P.C.B. Service Position, Figure 1.
Check the following parts on the Power P.C.B. with the tester.
D802, D807, D808, D811, D814,
D1001, D1002, D1003, D1004, D1006, D1007, D1008, D1009, D1010, D1011, D1012, D1016, D1017,
F801, F1001, IC1001 (Between Pin9 and Pin5), IC1002, IC1003,
PR1001, Q803, Q804, Q805, Q1001,
R806, R1006, R1009, R1011, R1022, R1026,
OK
Solder a jumper wire between TP810 and TP805 on the Power P.C.B.
Plug in the AC Cord.
Is there a snap sound of the Relay
turning ON?
(Relay: RL801, RL802 on the Power P.C.B.)
OK
Check the waveform between TP1001 and TP1002
(or between Pin 9 of IC1001 and HOT GND) on the Power P.C.B.
TP1001-TP1002
50 V
OK
Check the voltage at the following points. (Use Pin 12 of CN1003 as GND.)
- CN1003 (Pin 5):
approx. +9.5 V [STBY_7V]
- CN1003 (Pin 7):
approx. +30 V [REG_30V]
- CN1003 (Pin 10):
approx. +9 V
- CN1003 (Pin 1):
approx. +18 V [AUDIO_18V]
OK
A
Replace any defective parts.
Check the following parts on the
NO
Power P.C.B. with the tester.
D802, D807, D809, D852,
Q801, Q806,
R807, R808, R826, R827,
RL801, RL802, T801
Replace any defective parts.
5 µs
[REG_9V]
PT-50LCZ70 / PT-56LCZ70 / PT-61LCZ70 / PT-50LCZ7 / PT-56LCZ7 / PT-61LCZ7
NG
Check the other parts on the
Power P.C.B. and replace any
defective parts.
NG
NG
Check the other parts on the power
P.C.B. and replace any defective parts.
Plug in the AC Cord.
21
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