Read Sharp VC-M332HM (serv.man15) Service Manual online
47
VC-M332HM
VC-MH742HM
VC-MH742HM
FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2) (For VC-MH742HM)
No Hi-Fi sound recording(E-E mode is possible)
Check peripheral circuit of IC6301 as
shown in table.
Replace IC6301.
Check PC 5V lines.
YES
YES
NO
NO
NO
YES
YES
NO
NO
Is there REC FM signal outputted at the
IC6301 pins (21) to (24)(CH-1)/pins(21)
to (22)(CH-2).
Is the supply voltage of 5V fed to pin(25) of
IC6301?
Check AH-MZ harness.
Is there "L" level at pin(29) of IC6301?
Check or replace the cylinder.
Check the Hi-Fi CTL line between pin(29)
or IC6301 and pin(20) of IC701.
YES
Check the record current setting resistor
R6318 at pin(37) of IC6301.
L-ch pins(16),(17),(18),(19)
R-ch pins(35),(34),(33),(32)
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3) (For VC-742HM)
NO Hi-Fi sound playback(E-E mode is possible).
Check peripheral circuit of IC6301 as
shown in table.
Replace IC6301.
YES
NO
YES
Check PC 5V lines.
YES
YES
NO
NO
Is there playback envelope signal out-
putted at pins (29),(30) of IC6301?
Is the supply voltage of 5V fed to pin(25) of
IC6301?
Is there A-H.SW.P. signal at pin(27) of
IC6301?
Check the A-H.SW.P. line between pin(27)
of IC6301 and pin(26) of IC701.
L-ch pins(16),(17),(18),(19)
R-ch pins(35),(34),(33),(32)
FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING(1) (For VC-MH742HM)
No linear sound recording(E-E mode is possible)
Is there "L" level at pin(99) of
IC201?
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin(21) of IC701.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is there signal at pin(4) of IC201?
Is the supply voltage of 12V fed to
pin(2) of T651 and T652?
Check M 12V line.
Is there signal(Bias) at pin(5) of T651?
Check the Bias oscillation circuit(T651,T652,
Q651,Q652,Q654,Q655) and NORMAL BIAS
CTL, FULL ERASE BIAS CTL line.
Is there signal(Bias + Audio sig.) at
pin(6) of T651?
Check peripheral circuits of T651.
Check the MH-AA harness and A/C
head.
Replace IC201.
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