Read Sharp VC-MH834 (serv.man3) Service Manual online
53
VC-M314HM
VC-MH834HM
VC-MH834HM
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING(2) (For Hi-Fi and MONO model)
No linear sound recording (E-E mode is possible)
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?
Replace IC201.
Is the supply voltage of 12V fed to
pin (2) of
T651?
Check M 12V line.
Is there signal (Bias) at pin (5) of
T651?
Check the Bias oscillation circuit (T651,
Q651,Q652) and
A-ERASE CTL
line.
Is "L" level applied at pin(99) of
IC201?
Check peripheral circuits of
T651.
Check the MH-AA
harness and
A/C
head.
Is there signal (Bias +
Audio sig)
at pin (6) of
T651?
YES
YES
NO
FLOW CHART NO.26 LINEAR SOUND MODE TROUBLESHOOTING(3) (For Hi-Fi and MONO model)
Is there signal at pin (100) of IC201?.
Are there MH-AA
harness and the PB
AMP
peripheral parts normal?
No linear sound playback (E-E mode is possible)
NO
Is the azimuth height of
A/C head properly
adjusted?
Check the
AUDIO MUTE (H) line between
pin (99) of IC201 and pin (21) of IC701.
NO
Is there "L" level at pin (99) of IC201.
Is there signal at pin (1
1) of IC201.
YES
YES
Replace IC201.
Clean A/C
head.
Replace A/C
head.
Replace IC201.
Re-adjust azimuth.
NO
YES
YES
YES
YES
P
A
L
EP
ONL
Y
Are there signal at pin(1) of
IC 681?
YES
NO
Hi-Fi model ONL
Y
Is there audio signal inputted at
pin(54) of IC6301?
Check line between pin(1
1) of IC201
and pin(54) of IC6301.
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