Panasonic SC-TM72DV, Service Manual, Page: 22 / 132

13.1.2 Troubleshooting Guide Part 2
Checking
Points
Possible Faults Possible Reasons Countermeasure
1. No PLAYBACK
(PB)/Rec signal.
•
IC1001 problem. (Check pin 23/24 for PB
input, pin 5/20 for PB output).
•
Q1013/Q1012 shorted to ground with no
muting OFF.
•
Q1020/Q1021 shorted to ground with no
muting OFF.
•
Replace IC1001 if necessary.
•
Replace Q1013/Q1012 if necessary.
•
Replace Q1020/Q1021 if necessary.
2. Bias frequency.
•
L1002 /IC1004/ Q1004/Q1005 problem.
Check level of bias frequency and
oscillation.
•
Replace these components if
necessary when level is below
specification.
Deck Circuit
3. No supply voltage
(+B/M0+B)
•
See section on Panel Circuit.
1. FL No Display
•
-Vp too low to power FL display.
•
FL Display Driver IC problem. (IC6803)
•
See section on Power Circuit.
•
Replace IC6803 is faulty.
Panel
Circuit
2. Error codes
•
See section on error codes (Micro-processor
IC6800)
1. Audio Signal (I/P &
O/P) problem.
•
Check for IC2815.
•
Replace IC2815 if faulty.
Main Circuit
2. Video Signal
problem.
•
Refer to below section.