Service manual

3.4.3 Vertical Oscillation / Deflection Circuit Failure
(Check “3.2.3.2 Vertical Sync Unstable” before checking of this item)
Check the voltage at Pins 1 and 6 on the MAIN PWB.
Check the +15V/-15V line.
NG
OK
Expected failure point
IC401 or peripheral circuits
Check the saw-tooth waveform at Pin 5 of IC401 on the MAIN PWB.
NG
Check the vertical control input.
OK
Check the saw-tooth waveform at Pin 7 of IC401 on the MAIN PWB.
OK
NG
Check the saw-tooth waveform at Pin 15 of CN600 on the MAIN PWB.
NG
Expected failure point
IC601, IC401 or peripheral circuits
(Approx. 3Vp-p)
Expected failure point
Power circuit (See Item 3.4.1)
Expected failure point
IC401, vertical deflection yoke or peripheral circuits
3-20