VC-MH722HM (serv.man9). Part 7 - Trouble shooting guide and EEPROM set up (37-53) - Sharp VCR Service Manual (repair manual). Page 14

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VC-M522HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.29 DECODER TROUBLESHOOTING (VC-MH722HM/MH732HM)
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin47 of IC701(Y/C video output)
E2(L2) video input
→
pin19
pin18
pin20
→
E1(L1) video output
21PIN CONNECTOR
(B)
→
(A)
Pin20 of IC6401(Audio output L-ch)
E2(L2) audio input(L-ch)
→
pin36
pin1
pin35
→
E1(L1) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(A)
Pin19 of IC6401(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
Pin47 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)
Pin20 of IC6401(Audio output L-ch)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(R-ch)
E1(L ) audio input(R-ch)
Pin19 of IC6401(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
→
Pin15 of IC6651
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
→
Pin10of IC6651
Audio input(R-ch)
(B)
→
(C)
→
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 11V line.
Check line between pins(25), (26) 
of  IC2501 and pins(27), (28) of 
IC701. 
Is voltage 5V applied to the video 
section power terminal at pins(15), 
(17) of IC2501?
Is voltage 11V 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.
Is there SDA and SCL signal 
applied to pins(25) and (26) of 
IC2501?
FLOW CHART NO.30 DECODER TROUBLESHOOTING (VC-M522HM)
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin47 of IC701(Y/C video output)
E2(L2) video input
→
pin19
pin18
pin20
→
E1(L1) video output
21PIN CONNECTOR
(B)
→
(A)
Pin11 of IC201(Audio output)
E2(L2) audio input(L/R-ch)
→
pin36
pin1
pin35
→
E1(L1) audio output(L/R
-ch)21PIN CONNECTOR
(B)
→
(A)
Tuner video output
E1(L1) video input
Pin47 of IC701(Y/C video output)
→
pin16
pin14
pin19
pin23
→
E2(L2) video output
21PIN CONNECTOR
(B)
→
(C)
→
(A)
Tuner audio output(L-ch)
E1(L1) audio input(L/R-ch)
Pin11 of IC201(Audio output)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output(L/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/R-ch)
E1(L1) audio input(L/R-ch)
Tuner audio output
→
pin1
pin5
pin9
pin31
→
Pin9 of IC201
Audio input
(B)
→
(C)
→
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 11V line.
Check line between pins(25), (26) 
of  IC2501 and pins(27), (28) of 
IC701. 
Is voltage 5V applied to the video 
section power terminal at pins(15), 
(17) of IC2501?
Is voltage 11V 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.
Is there SDA and SCL signal 
applied to pins(25) and (26) of 
IC2501?
Display
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