Read Sharp VC-MH75 (serv.man9) Service Manual online
51
VC-MH75HM
FLOW CHART NO.27 DECODER TROUBLESHOOTING
SELECT
OUTPUT
INPUT SIGNAL
OUTPUT SIGNAL
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SIG.
FLOW INPUT
FLOW
(A)
Pin47 of IC701(Y/C video output
E2(L2) video input
Front video input
pin7
pin28
pin25
E1(L1) video output
21PIN CONNECTOR
(B)
(C)
(C)
pin13
pin2
E1(L1) audio output (L-ch)
(A)
(B)
(B)
E2(L2) audio input(L/R-ch)
Pin54 of IC651(Audio output R-ch)
pin33
pin11
pin1 E1(L1) audio output(R-ch)
pin42
21PIN CONNECTOR
(C)
(A)
(B)
(A)
(B)
E2(L2) audio intput(R-ch)
pin34
pin10
pin18 E2(L2) video output(L-ch)
pin43
21PIN CONNECTOR
(C)
(A)
(B)
(A)
(B)
E1(L1) video input
Pin47 of IC701(Y/C video output)
pin23
pin7
pin16
pin26
21PIN CONNECTOR
(C)
(A)
(B)
(A)
(B)
E1(L1) audio input(L-ch)
pin36
pin2
pin15
pin30
(C)
(A)
(A)
(B)
pin37
(
C)
pin1
(A) E2(L2) video input
pin28
(B) E1(L1) video input
pin23
(C) Tuner video output
pin18
(D)
pin13
(A) E2(L2) audio input(L-ch)
pin33
(B) E1(L1) audio input(L-ch)
pin36
(C) MPX output(L-ch)
pin16
(D)
pin11
(A) E2(L2) audio input (R-ch)
pin34
(B) E1(L1) audio input (R-ch)
pin37
(C)
pin15
(D)
pin10
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 12V line.
Check line between pins(21), (22)
of IC2501 and pins(17), (18) of
IC701.
Is there SDA and SCL signal
applied to pins(21) and (22) of
IC2501?
Is voltage 5V applied to the video
section power terminal at pins(24),
(29) of IC2501?
Is voltage 12V applied to the
audio section power terminal at
pins(14) 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.
Pin57 of IC651(Audio output L-ch)
Tuner video output
MPX output(L-ch)
Pin57 of IC651(Audio output(L-ch))
21PIN CONNECTOR
E2(L2) audio output (L-ch)
pin31
E2(L2) audio output (R-ch)
21PIN CONNECTOR
Pin31 of IC201
Y/C video input
(Aux. input)
Pin61 of IC651
(Aux. input
Pin52 of IC651
(Audio input (R-ch)
pin5
pin39
pin40
Front audio L-ch input
Front audio R-ch input
Front audio L-ch input
Front audio R-ch input
MPX output (R-ch)
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MPX output(R-ch)
Front video input
(switch)
E1(L1) audio input(R-ch)
Pin54 of IC651(Audio output R-ch)
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