Read Sharp VC-MH85 (serv.man4) Service Manual online
52
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
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 CONNECT
OR
(B)
(C)
pin13
pin2
E1(L1) audio output (L-ch)
(A)
(B)
E2(L2) audio input(L/R-ch)
Pin54 of IC651(Audio output R-ch)
pin33
pin1
1
pin1 E1(L1) audio output(R-ch)
pin42
21PIN CONNECT
OR
(C)
(A)
(B)
E2(L2) audio intput(R-ch)
pin34
pin10
pin18 E2(L2) video output(L-ch)
pin43
21PIN CONNECT
OR
(C)
(A)
(B)
E1(L1) video input
Pin47 of IC701(Y/C video output)
pin23
pin7
pin16
pin26
21PIN CONNECT
OR
(C)
(A)
(B)
E1(L1) audio input(L-ch)
pin36
pin2
pin15
pin30
(C)
(A)
(B)
pin37
(
C)
pin1
(A) E2(L2) video input
pin28
(B) E1(L1) video input
pin23
(C)
T
uner 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)
pin1
1
(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)
T
uner video output
MPX output(L-ch)
Pin57 of IC651(Audio output(L-ch))
21PIN CONNECT
OR
E2(L2) audio output (L-ch)
pin31
E2(L2) audio output (R-ch)
21PIN CONNECT
OR
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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