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FLOW CHART NO.24 DECODER TROUBLESHOOTING (For 2 SCART Hi-Fi and MONO model)
Not output from 21pin connector in video and audio signal.
Is voltage 5V applied to the video section power
terminal at pins(24), (29) of IC2501?
YES
Is voltage 12V applied to the audio section power
terminal at pins(14) of IC2501?
YES
Is there SDA and SCL signal applied to pins(21)
and (22) of IC2501?
YES
Check signal line from video and audio function
logic table as shown below.
<Linear Audio Double scart>
MODE
SIG.
INPUT SIGNAL
SELECT
FLOW
(A)
Pin47 of IC701(Y/C video output)
>
(B)
E2(L2) video input
>
(C)
Front video input
>
(A)
Pin11 of IC201 (Audio output)
>
(B)
E2(L2) audio input(L/R-ch)
>
(C)
Front audio input
>
Tuner video output
(A)
>
(B)
E1(L1) video input
>
(C)
Pin47 of IC701(Y/C video output)
>
(A)
Tuner audio output
>
(B)
E1(L1) audio input(L/R-ch)
>
(C)
Pin11 of IC201(Audio output)
>
(A)
E2(L2) video input
>
(B)
E1(L1) video input
>
(C)
Tuner video output
>
(D)
Front video input
>
(A)
E2(L2) audio input (L/R-ch)
>
(B)
E1(L1) audio input (L/R-ch)
>
(C)
Tuner audio output
>
(D)
Front audio input
>
NO
Check STBY 5V line.
NO
Check STBY 12V line.
NO
Check line between pins(21), (22) of IC2501 and
pins(17), (18) of IC701.
SIG.
DECODER CIRCUIT
OUTPUT SIGNAL
INPUT (switch) OUTPUT
FLOW
pin7
pin25
>
E1(L1) video output
pin28
21PIN CONNECTOR
pin13
pin2
pin42
>
E1(L1) audio output(L/R-ch)
pin33
21PIN CONNECTOR
pin11
E2(L2) video output
pin18
pin26
>
21PIN CONNECTOR
pin23
pin7
pin16
pin30
>
E2(L2) audio output(L/R-ch)
pin36
21PIN CONNECTOR
pin2
pin28
pin5
>
Pin31 of IC201
pin23
Y/C video input
pin18
(Aux. input)
pin13
pin33
pin39
>
Pin9 of IC201
pin36
Audio input
pin16
pin11
<Hi-Fi Audio Double scart>
MODE
SIG.
INPUT SIGNAL
SELECT
FLOW
(A)
Pin47 of IC701(Y/C video output)
>
(B)
E2(L2) video input
>
(C)
Front video input
>
(A)
Pin58 of IC6301 (Audio output L-ch)
>
E2(L2) audio input(L/R-ch)
(B)
>
(C)
Front audio L-ch input
>
(A)
Pin56 of IC6301(Audio output R-ch)
>
(B)
E2(L2) audio input(R-ch)
>
(C)
Front audio R-ch input
>
(A)
Tuner video output
>
(B)
E1(L1) video input
>
(C)
Pin47 of IC701(Y/C video output)
>
(A)
MPX output(L-ch)
>
(B)
E1(L1) audio input(L-ch)
>
(C)
Pin58 of IC6301(Audio output L-ch)
>
(A)
MPX output(R-ch)
>
(B)
E1(L1) audio input(R-ch)
>
(C)
Pin56 of IC6301(Audio output R-ch)
>
(A)
E2(L2) video input
>
E1(L1) video input
(B)
>
(C)
Tuner video output
>
(D)
Front video input
>
(A)
E2(L2) audio input (L-ch)
>
(B)
E1(L1) audio input (L-ch)
>
(C)
MPX output(L-ch)
>
(D)
Front audio L-ch input
>
(A)
E2(L2) audio input (R-ch)
>
(B)
E1(L1) audio input (R-ch)
>
(C)
MPX output (R-ch)
>
(D)
Front audio R-ch input
>
SIG.
DECODER CIRCUIT
OUTPUT SIGNAL
INPUT (switch) OUTPUT
FLOW
pin7
pin25
>
E1(L1) video output
pin28
21PIN CONNECTOR
pin13
pin2
pin42
>
E1(L1) audio output(L-ch)
21PIN CONNECTOR
pin33
pin11
>
E1(L1) audio output(R-ch)
pin1
pin43
pin34
21PIN CONNECTOR
pin10
pin18
pin26
>
E2(L2) video output(L-ch)
pin23
21PIN CONNECTOR
pin7
pin16
pin30
>
E2(L2) audio output(L-ch)
pin36
21PIN CONNECTOR
pin2
pin15
pin31
>
E2(L2) audio output(R-ch)
pin37
21PIN CONNECTOR
pin1
pin28
pin5
>
Pin31 of IC201
Y/C video input
pin23
(Aux. input)
pin18
pin13
pin33
pin39
>
Pin61 of IC6301
pin36
(Aux. input)
pin16
pin11
pin34
pin40
>
Pin52 of IC6301
pin37
(Audio input (R-ch)
pin15
pin10
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