Read Sharp VC-MH834 (serv.man3) Service Manual online
55
VC-M314HM
VC-MH834HM
VC-MH834HM
FLOW CHART NO.28 DECODER TROUBLESHOOTING (For 2 SCART Hi-Fi and MONO model)
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)
Pin56 of IC6301(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.
<Linear
Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT
SIGNAL
FLOW
SIG.
FLOW
INPUT
OUTPUT
OUTPUT
SIGNAL
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)
Pin1
1 of IC201 (Audio output)
I
Front audio input
pin13
pin2 pin 42
E1(L1) audio output(L/R
(A)
E2(L2) audio input(L/R-ch)
pin33
pin1
1
-ch)21PIN CONNECT
OR
(C)
(A)
E1(L1) video input
Pin47 of IC701(Y/C video output)
pin18
pin23
pin7
pin26
E2(L2) video output
21PIN CONNECT
OR
(B)
(C)
(A)
E1(L1) audio input(L/R-ch)
Pin1
1 of IC201(Audio output)
pin16
pin36
pin2
pin30
E2(L2) audio output(L/R
-ch)21PIN CONNECT
OR
(B)
(C)
(A)
E1(L1) video input
pin28
pin23
pin18
pin5
Pin31 of IC201
Y/C video input
(Aux. input)
(B)
(C)
(D)
E2(L2) audio input (L/R-ch)
E1(L1) audio input(L/R-ch)
Front audio input
pin13
pin33
pin36
(A)
(B)
(C)
pin16
pin1
1
pin39
Pin 9 of IC201
Audio input
(D)
T
uner video output
Front video input
Pin58 of IC6301(Audio output L-ch)
T
uner video output
MPX output(L-ch)
Pin58 of IC6301(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 IC6301
(Aux. input
Pin52 of IC6301
(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
(A)
(B)
T
uner video output
T
uner audio output
E2(L2) video input
T
uner audio output
(switch)
(switch)
E1(L1) audio input(R-ch)
Pin56 of IC6301(Audio output R-ch)
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