Checking Points
Possible Faults
Possible Reasons
Countermeasure
Transformer Circuit
1.
No
power
supply
voltage to the Power
Circuit from AC In.
·
Transformer
no
output
voltage.
·
Power
Line
filter
relay
RL502.
·
D950 open circuit.
·
Replace of Transformer T501 if found faulty.
·
Replace of Power Relay if found faulty.
Power Circuit
1. No supply voltage to
Power
Supply
Circuit
from
Transformer
Circuit. (+VccL/+VccH/-
VccL/-VccH)
·
Fuse F3/F4 blown.
·
Rectifier Circuit problem.
·
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 Supply
Circuit
from
Transformer
Circuit.
(+VccL/+VccH/-VccL/-
VccH)
·
Rectifier Circuit problem.
·
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.
1. No supply voltage to
Panel Circuit.
·
Q5815/D5835 faulty. (-VP
voltage not sufficient to
power FL display at - 30V)
·
Q5816/D5839 faulty. (Sys
6V not sufficient to power
micro-processor IC at 6V.
·
Replace Q5815/D5835 if found faulty.
·
Replace Q5816/D5839 if found faulty.
Power Amp Circuit
1.
No
output
FL/FR
output signal.
·
No
supply
voltage
to
IC5803.
(+VccL/+VccH/-
VccL/-VccH/+Vd/-Vd).
·
Replace IC5803 if found faulty.
Power Supply Circuit
1.
No
+9V/-
9V/SW5V/8V/LED9V/M
010V Supply Voltage to
Main Circuit.
·
IC5802 problem. (Check
pin
2,8,9,10,11
for
voltages)
·
Replace IC5802 if found faulty.
2. No output SL/SR/C
signal (Check for input
signal
before
troubleshooting
for
IC5801.)
·
IC5801 problem. (Check
pin 1,2,5 for output signal)
·
Replace IC5801 if found faulty.
12.1.2. Troubleshooting Guide Part 2
Checking Points
Possible Faults
Possible Reasons
Countermeasure
Deck Circuit
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.
3. No supply voltage
(+B/M0+B)
·
See
section
on
Panel
Circuit.
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.
2. Error codes
·
See section on error codes
(Micro-processor IC6800)
Main Circuit
1. Audio Signal (I/P &
O/P) problem.
·
Check for IC2815.
·
Replace IC2815 if faulty.
2.
Video
Signal
problem.
·
Refer to below section.
12.1.3. Checking of VIDEO COMPONENT OUTPUT
VIDEO
SIGNAL
Y
C
CR/PR/R
CB/PB/B
PY/Y/G
Input
Pin 5 (IC2809)
Pin 3 (IC2809)
Pin 14 (IC2809)
Pin 12 (IC2809)
Pin 8 (IC2809)
VIDEO
SIGNAL
Y
C
CR
CB/PB/B
PY
Output
Pin 24/25 (IC2809) Pin 32 (IC2809)
Pin 17 (IC2809)
Pin 19 (IC2809)
Pin 21/22 (IC2809)
18
SA-VK81DEE
Summary of Contents for SA-VK81DEE
Page 8: ...8 Accessories Remote control AC cord FM antenna AM antenna Video cable 8 SA VK81DEE ...
Page 9: ...9 Operation Procedures 9 SA VK81DEE ...
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Page 11: ...10 Disc information 11 SA VK81DEE ...
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Page 16: ...12 Procedure for repairing the set 16 SA VK81DEE ...
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Page 68: ...18 3 1 Cassette Deck Section 18 3 2 Adjustment Point 18 3 Alignment Points 68 SA VK81DEE ...
Page 128: ...25 1 Deck Mechanism RAA3412 S 25 1 1 Deck Mechanism Parts Location 128 SA VK81DEE ...
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Page 131: ...25 2 DVD Loading Mechanism 25 2 1 DVD Loading Mechanism Parts Location 131 SA VK81DEE ...
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Page 135: ...25 3 Cabinet 25 3 1 Cabinet Parts Location 135 SA VK81DEE ...
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