LG EC970W - Servo Circuit

3-7
2. Servo Circuit
Unstable Video in PB
Mode.
Does the on screen noise
level change periodically?
Do CTL pulses appear at
IC501 pin 97?
Does the CFG divide
waveform appear at IC501
pin 87?
Do the CTL pulses move
when TRK is operated?
Replace IC501.
Does the Video Envelope
waveform appear at IC501
Pin 9?
NO
YES
YES
YES
YES
YES
A.
Is the height of the CTL
Head adjusted correctly?
NO
Replace IC501.
NO
Check Y/C Block.
NO
Adjust the CTL Head.