No vert1cal Sweep
M-900 x >< X Series
M-1200 >< X x Series
IC31 are cosists V.osc V.amp and V output therefore,
may be IC internal problem
Check Pin 2, 4, 5, 8.signal level of IC31
and Pin 12, DC voltage of +12V line
Normal
Check deflection coil
deflection coil connector
Check contact P1, P2 of deflection yoke
Normal
Check deflection coil open, H.Lin, Width
(Replace parts)
Abnormal
Trouble in IC31 (Replace 31)
No
Check peripreral c!rcuit of IC:11
Bad.
Replace or Change
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