Read Sharp DV-L80 (serv.man3) Service Manual online
DV-L80S/W
18
8.
TR
OUBLESHOO
TING
Check AC adapter or CAR adapter or battery-pack.
No
Voltage on DC JACK (Approx. 10.5V) or CAR
JACK (Approx. 9V) or battery terminal (8.4 - 6V)?
Yes
The power cannot be turned on.(1)
•When using the AC adapter ------check circuit
around F9801, Q904, Q905, connector, lead wire.
•When using battery------check circuit around
F901, Q906, Q913, connector, lead wire.
No
Voltage specified above (Approx.6 - 11V) on
TP9002, TP9003 in the MAIN?
Yes
Voltage of approx. 6 - 11V supplied on 5 pin of
IC5503?
No
Voltage of approx. 5V supplied on 72 pin of
IC5502 (TV microcomputer)?
Yes
Yes
29 pin of IC5502 still “L”?
No
Oscillation signal of 32kHz checked on 23, 24 pins
of IC5502?
Yes
Check the IC5502 and X5502.
Check the Q5514 and Q5511.
No
No
No
Yes
Circuit protector CP9001 is actuated (disconnection)
replace. Check CLD inverter circuit and INV-V line.
Refer to “
The key operation is disabled.
” or
“No operation is possible from the infrared remote
control.”.
No
Approx. 5V outputted to 45 pin of IC5502?
No
Yes
Check PCON-H line between IC5502 - IC9001.
Approx. 4.5 V supplied to 20 - 22 pins of IC9001?
Yes
Appropriate voltage outputted on each B line
(TP9005 - 9012)?
No
No
Yes
Triangle oscillation of approx. 0.6V p-p checked on
17 pin of IC9001?
Circuit protector CP9002, CP9003 cut?
Yes
Check short circuit of each SWITCHING TR and
each B line.
* All the B lines cannot be outputted for short
circuit of even 1postion (1 line).
Replace IC5503.
Replace IC9001.
FLOW CHART NO.1
Attach junction line properly or replace junction line.
No
Wire between operation PWB and MAIN PWB
connected properly?
Yes
Yes
The key operation is disabled.
No
Power button does not function.
No
When power button is pressed, 5 pin of IC5502 is
"L"?
Yes
Is the control voltage normally into the pins(78)
and (80) of IC5502? (78pin
→
KEY)
Replace operation pwb.
Yes
Replace operation pwb.
Replace IC5502.
No
Replace IC5502.
FLOW CHART NO.2
Check TVMI_5V line.
Replace the remote control receiver.
FLOW CHART NO.3
Operation is possible from the body, but no
operation is possible from the infrared remote
control.
Replace the remote control receiver or replace the
remote control transmitter is necessary.
Is 5V voltage supplied to the pin 2 terminal of
remote control receiver?
Is the "L" pulse sent out pin 3 terminal of receiver
when the infrared remote control is activated?
(Actuated with power button)
DVD cannot be operated but TV can be operated.
(DVD is actuated with play, stop button.)
To 2
1“L” pulse signal is generated from 79 pin of
IC5502?
(Actuated with power button)
No
No
No
Yes
No
To 1
Replace IC5502.
No
Yes
Check line of 2 pin of IC3001.
2“L” pulse signal is generated from 32 pin of
IC502?
(DVD is actuated with play, stop button.)
Replace IC502.
No
Yes
Check D506 line.
Yes
Yes
Yes
No operation is possible from the infrared remote control.
3.0V
3.7V
2.3V
1.6V
0.9V
Volume large Volume small
TV/External/DVD button
change over
SKIP(+)/RIGHT
→
SKIP(-)/LEFT
UP
↑
/STILL DOWN
↓
/STOP
Play setting Determination/Play
RETURN
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