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50
VC-ME80GM
VC-ME80HM
VC-ME80HM
FLOW CHART NO.26 DECODER TROUBLESHOOTING
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin(47) of IC701(Y/C video output)
E2(L2) video input
→
pin19
pin18
pin20
→
E1(L1) video output
21PIN CONNECTOR
(B)
→
(A)
Pin(59) of IC6301(Audio output L-ch)
E2(L2) audio input(L-ch)
→
pin36
pin1
pin35
→
E1(L1) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(A)
Pin(55) of IC6301(Audio output R-ch)
E2(L2) audio input(R-ch)
→
pin33
pin3
pin32
→
E1(L1) audio output(R-ch)
21PIN CONNECTOR
(B)
→
(A)
Tuner video output
E1(L1) video input
Pin(47) of IC701(Y/C video output)
→
pin16
pin14
pin19
pin23
→
E2(L2) video output
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(L-ch)
E1(L1) audio input(L-ch)
Pin(59) of IC6301(Audio output L-ch)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(R-ch)
E1(L1) audio input(R-ch)
Pin(55) of IC6301(Audio output R-ch)
→
pin11
pin7
pin33
pin28
→
E2(L2) audio output(R-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
E2(L2) video input
E1(L1) video input
Tuner video output
→
pin18
pin14
pin16
pin21
→
Pin31 of IC201
Y/C video input
(Tuner/Aux. input)
(B)
→
(C)
→
(A)
E2(L2) audio input(L-ch)
E1(L1) audio input(L-ch)
MPX. output(L-ch)
→
pin1
pin5
pin9
pin31
→
Pin61 of IC6301
Audio input(L-ch)
(B)
→
(C)
→
(A)
E2(L2) audio input(R-ch)
E1(L1) audio input(R-ch)
MPX. output(R-ch)
→
pin3
pin7
pin11
pin30
→
Pin52 of IC6301
Audio input(R-ch)
(B)
→
(C)
→
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 10.5V line.
Check line between pins(25), (26)
of IC2501 and pins(17), (18) of
IC701.
Is voltage 5V applied to the video
section power terminal at pins(15),
(17) of IC2501?
Is voltage 10.5V applied to the
audio section power terminal at
pins(8), (10) of IC2501?
Check signal line from video and
audio function logic table as shown
below.
Not output from 21pin connector in video and audio signal.
are there SDA and SCL signal
applied to pins(25) and (26) of
IC2501?
FLOW CHART NO.27 GAMMA TROUBLESHOOTING
NO
NO
NO
YES
YES
YES
Check the line between the pin(1) of
IC4401 and the pin(7) of IC4401.
Is the luminance signal output to the
GAMMA input Q4401 emitter?
Check the line between the pin(6) of
IC4503 and Q4401.
Is the luminance signal output to the
pin(1) of impedance conversion
circuit IC4401?
Is the luminance signal output to
the pin(5) of slice, low luminance
part amplification IC4403?
NO
Check the line between the pin(1) of
IC4401 and the pin(5) of IC4403.
YES
Is the luminance signal output to the
pin(7) of impedance conversion,
slice circuit IC4402?
NO
Check the line between the pin(5) of
IC4403 and the pin(7) of IC4402.
YES
Is the video signal input into the
pin(1) of video level adjusting circuit
IC4403?
NO
Check the peripheral circuit of
Q4408, Q4410, R4414, R4415,
R4416, R4431, and R4433.
YES
Is the video signal input into the
pin(3) of luminance signal selection
circuit IC4409?
NO
Check the video level adjustment
(IC4403) circuit and video
amplification (IC4402) circuit.
YES
Check or replace the periphery of
IC4409.
Is the pin(2) of IC4409 in "H" level
state?
Is the video signal output to the
pin(7) of luminance signal selection
circuit IC4409?
YES
Check the GAMMA(H) line.
Check the line between the pin(2) of
IC4409 and the pin(35) of IC701.
Even when each signal can be
confirmed, adjust again according to
the specified adjustment procedure.
1. GAMMA slice level adjustment
2. GAMMA level adjustment
3. GAMMA sync level adjustment
4. GAMMA video output level
adjustment
YES
NO
NO
Does the pedestal clamp circuit
(IC4501, IC4404, IC4405) operate
normally?
The GAMMA correction circuit does not operate.
Is the luminance signal output to the
pin(7) of slice, impedance
conversion circuit IC4401?
Check the line between the pin(1) of
IC4401 and the Q4401 emitter.
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