Sharp VC-MH742HM (serv.man15) Service Manual ▷ View online
35
VC-M332HM
VC-MH742HM
VC-MH742HM
Replace loading motor block.
3. WINDING FAILURE AT VSR
4. UNUSUAL SOUND IN EACH MODE
Is Playback
function normal ?
Master cam
shifting to VSR
position ?
Go to 2. REC/
PLAY FAILURE
routine.
Replace idler
gear ass’y.
Replace limiter
pulley ass’y.
Replace reel
sensor.
Go to 2. REC/
PLAY FAILURE
routine.
Are idler wheel
ass’y and supply
reel disk in mesh ?
Is supply reel disk
winding torque
normal ?
Is pulse outputted
from reel sensor?
Check main PWB.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
NO
NO
YES
Press REW key.
4-i) Unusual sound in cassette
insertion and ejection mode
Is unusal sound heard during
cassette coutrol running ?
Unusual sound heard with pinch
roller lever going up or down ?
Is unusual sound heard during
loading/unloading ?
Check pinch roller drive cam, pinch roller
drive lever and reverse guide for their actions.
Replace damaged one with new one.
Replace cassette control ass’y.
36
VC-M332HM
VC-MH742HM
VC-MH742HM
YES
YES
NO
NO
NO
NO
YES
YES
Replace capstan motor.
4-ii) Unusual sound in FF/REW mode
Is reel disk height as specified ?
Thrust gap found at reel disk ?
part on main PWB ?
Turn capstan motor by hand.
Unusual sound heard ?
damage. Replace damaged gear
with new one.
• Reel disk
• Limiter pulley ass’y
• Idler wheel ass’y
Check reel disk and main chassis.
And replace defective parts.
Adjust reel disk height.
Rearrange the parts on main PWB.
36
VC-M332HM
VC-MH742HM
VC-MH742HM
YES
YES
NO
NO
NO
NO
YES
YES
Replace capstan motor.
4-ii) Unusual sound in FF/REW mode
Is reel disk height as specified ?
Thrust gap found at reel disk ?
part on main PWB ?
Turn capstan motor by hand.
Unusual sound heard ?
damage. Replace damaged gear
with new one.
• Reel disk
• Limiter pulley ass’y
• Idler wheel ass’y
Check reel disk and main chassis.
And replace defective parts.
Adjust reel disk height.
Rearrange the parts on main PWB.
36
VC-M332HM
VC-MH742HM
VC-MH742HM
YES
YES
NO
NO
NO
NO
YES
YES
Replace capstan motor.
4-ii) Unusual sound in FF/REW mode
Is reel disk height as specified ?
Thrust gap found at reel disk ?
part on main PWB ?
Turn capstan motor by hand.
Unusual sound heard ?
damage. Replace damaged gear
with new one.
• Reel disk
• Limiter pulley ass’y
• Idler wheel ass’y
Check reel disk and main chassis.
And replace defective parts.
Adjust reel disk height.
Rearrange the parts on main PWB.
Display
