Servo Circuit - LG EC290W 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 97?
YES
Does the CFG divide
waveform appear at IC501
pin 87?
YES
Do the CTL pulses move
when TRK is operated?
YES
Does the Video Envelope
waveform appear at IC501
Pin 9?
YES
Replace IC501.
NO
Is the height of the CTL
Head adjusted correctly?
NO
Replace IC501.
NO
Check Y/C Block.
3-7
NO
Adjust the CTL Head.