Panasonic SC-TM72DV - Troubleshooting Guide Part 1

13.1.1 Troubleshooting Guide Part 1
Checking Points Possible Faults Possible Reasons Countermeasure
1. Failure to power-up the main unit.
2. Power On switch
• Wrong selection of
AC power to main
un
it.
• Voltage selector is
faulty.
• AC inlet JK500 is
faulty.
•
AC Line filter L500 is
faulty.
• Power On switch
br
oken.
• Replace of fuse if found faulty.
• Replace of voltage selector if found
faulty.
• Replace of AC Inlet if found faulty
or
damaged.
• Replace AC Line filter is found
faulty or damaged.
• Replace Power On button switch if
necessary.
• If conditions as mentioned above is
in good condition. Check for wire
connection.
(W1/
W2/W3/W4/W6/W7). If
connection is good, please proceed
to check for Transformer Circuit.
AC Inlet
Circuit/Voltage
Selector Circuit
3.
Intermittent Power supply to main
unit.
• Check for connection. • If condition 1 to 4 as mentioned
above is in good condition. Check
for wire connection.
(W1/
W2/W3/W4/W6/W7). If
connection is good, please proceed
to
checkfor Transformer Circuit
Transformer
Circuit
1. No power supply voltage to the Power
Circuit from AC In.
•
Transformer no output
vo
ltage.
• Power Line filter
relay RL502.
• Replace of Transformer T501 if
fo
und faulty.
• Replace of Power Relay if found
faulty.
• D950 open circuit.
1. No supply voltage to Power Supply
Circuit from Transformer Circuit.
(+VccL/+VccH/-VccL/-VccH)
• Fuse F3/F4 blown.
• Rectifier Circuit
pr
oblem.
• Replace fuse F3/F4 if found faulty.
• Replace
D5832/D5831/D5846/D5847 if any
is found to be faulty or damage.
1. No supply voltage to Main & Power
Su
pply Circuit from Transformer
Circuit. (+VccL/+VccH/-VccL/-VccH)
• Rectifier Circuit
pr
oblem.
• F5801/FP5802 open
circuit.
• Replace D5844 if found faulty.
• Replace FP5801/FP5802 of the
same type as indicated in the part-
list
if found faulty.
Power Circuit
1.
No supply voltage to Panel Circuit.
• Q5815/D5835 faulty.
(-
VP voltage not
sufficient to power FL
di
splay at - 30V)
• Q5816/D5839 faulty.
(S
ys 6V not sufficient
to
power micro-
proce
ssor IC at 6V.
• Replace Q5815/D5835 if found
faulty.
• Replace Q5816/D5839 if found
faulty.