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SA-VK81DEE
Checking Points
Transformer Circuit
1. No power supply
voltage to the Power
Circuit from AC In.
Power Circuit
1. No supply voltage to
Power Supply
from
Circuit. (+VccL/+VccH/-
VccL/-VccH)
1. No supply voltage to
Main & Power Supply
Circuit
Transformer
(+VccL/+VccH/-VccL/-
VccH)
1. No supply voltage to
Panel Circuit.
Power Amp Circuit
1. No output
output signal.
Power Supply Circuit
1.
9V/SW5V/8V/LED9V/M
010V Supply Voltage to
Main Circuit.
2. No output SL/SR/C
signal (Check for input
signal
troubleshooting
IC5801.)
12.1.2. Troubleshooting Guide Part 2
Checking Points
Deck Circuit
1.
(PB)/Rec signal.
2. Bias frequency.
3. No supply voltage
(+B/M0+B)
Panel Circuit
1. FL No Display
2. Error codes
Main Circuit
1. Audio Signal (I/P &
O/P) problem.
2.
problem.
12.1.3. Checking of VIDEO COMPONENT OUTPUT
VIDEO
Y
SIGNAL
Input
Pin 5 (IC2809)
VIDEO
Y
SIGNAL
Output
Pin 24/25 (IC2809) Pin 32 (IC2809)
All manuals and user guides at all-guides.com
Possible Faults
Possible Reasons
· Transformer
voltage.
· Power
RL502.
· D950 open circuit.
· Fuse F3/F4 blown.
Circuit
· Rectifier Circuit problem.
Transformer
· Rectifier Circuit problem.
· F5801/FP5802
from
circuit.
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.
FL/FR
· No
supply
IC5803.
VccL/-VccH/+Vd/-Vd).
No
+9V/-
· IC5802 problem. (Check
pin
2,8,9,10,11
voltages)
· IC5801 problem. (Check
pin 1,2,5 for output signal)
before
for
Possible Faults
Possible Reasons
· IC1001 problem. (Check
No
PLAYBACK
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.
· L1002
Q1004/Q1005
Check
frequency and oscillation.
· See
section
Circuit.
· -Vp too low to power FL
display.
· FL
Display
problem. (IC6803)
· See section on error codes
(Micro-processor IC6800)
· Check for IC2815.
Video
Signal
· Refer to below section.
C
Pin 3 (IC2809)
Pin 14 (IC2809)
C
Pin 17 (IC2809)
no
output
· Replace of Transformer T501 if found faulty.
· Replace of Power Relay if found faulty.
Line
filter
relay
· Replace fuse F3/F4 if found faulty.
· Replace D5832/D5831/D5846/D5847 if any is found to
be faulty or damage.
· Replace D5844 if found faulty.
open
· Replace FP5801/FP5802 of the same type as indicated
in the part-list if found faulty.
· Replace Q5815/D5835 if found faulty.
· Replace Q5816/D5839 if found faulty.
voltage
to
· Replace IC5803 if found faulty.
(+VccL/+VccH/-
· Replace IC5802 if found faulty.
for
· Replace IC5801 if found faulty.
· Replace IC1001 if necessary.
· Replace Q1013/Q1012 if necessary.
· Replace Q1020/Q1021 if necessary.
/IC1004/
· Replace these components if necessary when level is
problem.
below specification.
level
of
bias
on
Panel
· See section on Power Circuit.
· Replace IC6803 is faulty.
Driver
IC
· Replace IC2815 if faulty.
CR/PR/R
CB/PB/B
Pin 12 (IC2809)
CR
CB/PB/B
Pin 19 (IC2809)
18
Countermeasure
Countermeasure
PY/Y/G
Pin 8 (IC2809)
PY
Pin 21/22 (IC2809)
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