Lack Of Stable Vertical Synchronization - Tatung OMNISCAN SERIES Service Manual

6.25 LACK OF STABLE VERTICAL SYNCHRONIZATION
VERTICAL
CHECK INPUT FREOUENCY
--------------------------->
45Hz TO 100Hz
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CHECK SIGNAL SYNC. TYPE
-------------------------->
G+SYNC., H+V, HjV
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CHECK SYNC. Sw.
------------------------------>
G+SYNC.
S001 H+V
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HjV
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CONNECTOR
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(Sw. OFF)
(SW. ON)
(SW. ON)
P003 (PWa-1697).
CHECK SYNC. CIRCUIT
---------------------------------->
R301, C301
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CONNECTOR P401 (PWB-1701)
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P504
(~VV~-1697:2)
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CHECK VERT. SEPARATOR
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: INTEGRATED CKT. ,
r----------------------------------------------->
0553, 0552,
0562c
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0556, 0559,
0562d
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G+SYNC.
~---------------------------------------------.
>
0052, 0053, 0556, 0551
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(PWB-1697 -2)
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H+V
L------------------------------------------->
0562a,
0555, 0505
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0554,
0562b . .
: (PWB-1697)
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HjV
r---------------------------------------------->
0562a,
0555, 0505
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0554,
0562b
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(PWB-1697)
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CHECK VERT. OSC
-------------------------------->
0301
(PWB-1701)
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END
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