Servo Circuit - Sanyo VHR-VK210A Service Manual

2. Servo Circuit

A.
Unstable Video in PB
Mode.
Does the on screen noise
level change periodically?
YES
Do CTL pulses appear at
IC501 pin 37?
YES
Does the CFG divide
waveform appear at IC501
pin 40?
YES
Do the CTL pulses move
when TRK is operated?
YES
Does the Video Envelope
waveform appear at IC501
Pin 12?
YES
Replace IC501.
NO
Is the height of the CTL
Head adjusted correctly?
NO
Replace IC501.
NO
Check AVCP IC.
NO
3-6
Adjust the CTL Head.