Hitachi DV-RV8500E/UK Service Manual page 27

Details of Servicing and Troubleshooting > Troubleshooting
(3) Servo circuit
Faulty image during playback
(noise on screen changes)
No
IC501-72: CTL pulses?
Yes
No
IC501-67: CFG waveform?
Yes
No
Does tracking operation
move CTL pulses?
Yes
No
IC501-82:
Envelope waveform?
Yes
Replace IC501.
Cylinder motor does not rotate.
No
Is 12 V supplied
to PMC01-8?
Yes
No
PMC01-12: 2.8 V?
Yes
Check connector between
PMC01 and cylinder motor.
No
Is the height of
A/C head appropriate?
Yes
Check CTL pulse line.
Check CFG line.
Replace IC501.
See "No Y signal
during playback" in
(4) VIDEO circuit.
See "No 12VA" in
(1) SMPS circuit.
No
IC501-34:
DRUM PWM pulses?
Yes
Check for short-circuit
between IC501-34 and
PMC01-12.
Readjust the height
of A/C head.
No
PMC01-11: DFG pulses?
Yes
No
IC501-65: DFG pulses?
Yes
No
IC501-34:
DRUM PWM pulses?
Yes
Check for short-circuit
between IC501-34 and
PMC01-12.
3 - 7
Replace capstan motor.
Check for short-circuit
between IC501-65 and
PMC01-11.
Replace IC501.