JVC HR-XVC25US Service Manual page 38

TROUBLESHOOTING GUIDE
AT PLAY, THE PICTURE
JITTERS VERTICAL MINUTELY
Is FG wave of CP3001
NO Change
at pin 11 5V ?
CYLINDER MOTOR.
5V
YES
NO
Change IC3001.
Is pin 12 of CP3001 2.6V ?
YES
Change CYLINDER MOTOR.
AUTO TRACKING
DOES NOT OPERATE
Does the CTL pulse
signal (about 2.5Vp-p)
In auto tracking, is the
NO
NO
Check CONTROL HEAD.
appear at pin 7 of IC3001.
voltage at pin 24 of IC3001
2.5Vp-p
more than DC 0.2V?
YES
YES
Change IC3001.
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