Panasonic SA-PT75, Руководство по обслуживанию

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7.1.2. Troubleshooting Guide
Symptom Checking items Possible Fault(s) Remarks
Unit cannot power up (No
standby LED) 1) Check AC cord
connection
2) Fuse, F1
3) AC inlet, P5701
1) Faulty AC cord (No Power)
2) Fuse, F1 blow (open circuit)
3) AC inlet, P5701 solder crack, dry-
joint etc
4) L5701 and/or L5702 open circuit
5) TH5702 faulty
SMPS P.C.B
Refer to Figure 1
SMPS P.C.B
Refer to Figure 1
Refer to Figure 2
Power on for a while then
trigger “F61” 1) Check Speaker
connections
2) Check pin 21 & pin 22
of IC200 (micro-p)
3) Check +VDD &
feedback circuit
1) Speakers short-circuit (check
individual channels)
2) Over-temperature
3)
Shunt regulator, IC5801 faulty
4) Feedback circuit: PC5720, D5725
faulty
5) Main Transformer faulty, T5701
(Primary circuit)
6) Switching regulator, IC5701 faulty
7) Diode, D5701 faulty
Power on for a while and
then trigger
“F76” 1) Check VDD & SYS6V
at pin 1,2,5 at H2016 of
SMPS P.C.B.
2) Check voltage: –Vp,
FL1 & FL2 at pin 15,
12 & 13 of H2016 (FL
no display)
3) Check Pin 2 of
Switching regulator,
IC106 (For DVD + 5V &
+3.3V)
4) Check E of Q107 (For
M+9V)
1) Cable/Wire not connected properly
between Main/D-Amp P.C.B &
SMPS P.C.B or broken.
2) Main Transformer, T5701
short/open or broken.
3) Switching regulator, D5802 faulty.
4) Switching Transformer, T2900 faulty
5) L2915/L2916 Open circuit
6) L2910 Open circuit
7) FP2901 open circuit.
8) Switching regulator IC, IC106 faulty
(No DVD +5V/ +3.3V & SW5V)
9) IP100 faulty (open circuit) – No
+12V supply to Q107 (regulator
circuit)
a) SMP P.C.B
Refer to
Figure 1
Refer to
Figure 2
b) Main / D-
Amp P.C.B
No audio output to speaker 1) Check O/P of Digital
Amplifier IC (Pin 28, 31,
36 & 39, 36)
2) Check I/P to Digital
Amplifier IC (Pin 6, 8,
16, 18)
3) Check supply to Digital
Amplifier IC (IC403,
IC404, IC405) , VDD
(Pin 21)
4) Check DAP IC I/P (Pin
28, 30, 31)
5) Check DAP IC, IC401
(Pin 40 to 52)
6) Check speaker
connection
1) Digital Amplifier (IC403, IC404 or
IC405) IC faulty (There is voltage
supply & I/P but no O/P)
2) DAP IC, IC401 faulty (There is
supply to DAP IC & I/P but no O/P)
3) No oscillating signal, X401 faulty
Main / D-Amp
P.C.B