Sharp VC-MH705HM/LM

38
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
MECHANISM TROUBLESHOOTING
1. FF/REW FAILURE (NO TAPE WINDING)
Press FF key.
NO
NO
NO
NO NO NO
NO
NO
YES

YES

YES

YES

YES

YES

YES

YES

Is master cam at
FF position ?
Does loading
motor operate ?
Modes changing
smoothly through
mode switch ?
Loading motor
control system
in trouble.
Are Vco 24V and
Vcc 5V applied ?
Replace the
capstan motor.
Replace the idler
ass’y.
Replace the reel
sensor.
Is voltage applied
to loading motor ?
Loading motor is
damaged. Replace
it.
Voltage supply
system in trouble.
Mode SW in 
trouble or master 
cam malpositioned.
Voltage supply
system in trouble.
Does capstan
motor turn in FF (or
REW) direction ?
Are idler wheel
ass’y and reel disk
in mesh ?
Is the pulse
outputted from reel
sensor ?

The cassette tape
is presumably
damaged.
2. REC/PLAY FAILURE (MODE RELEASE)
NO
NO
NO
NO NO NO
NO
YES

YES

YES

YES

YES

YES

YES

YES

Is the master cam
at PB position ?
Does loading
motor operate ?
Modes changing
smoothly through
mode switch ?
Loading motor
control system
in trouble.
Are Vco 24V and
Vcc 5V applied ?
Replace the
capstan motor.
Replace the idler
ass’y.
Replace the reel
sensor.
Is voltage applied
to loading motor ?
Loading motor is
damaged. Replace
it.
Voltage supply
system in trouble.
Voltage supply
system in trouble.
Does capstan
motor turn ?
Are idler wheel
ass'y and reel disk
in mesh ?
Is the pulse 
outputted from reel
sensor ?
Check main PWB.


www.freeservicemanuals.info
6/17/2019
Digitized in Heiloo the Netherlands
Not for sale!