NEC MultiSync 2A Service Manual page 27

7.
LACK OF STABLE SYNCHRONIZATION
•
HORIZONTAL
CHECK H.SYNC.
OK
NG
•
VERTICAL
CHECK V.SYNC
NG
OK
IC401 FAILURE
CHECK THE VOLTAGE FORM
O F CONNECTOR 04-3
SEE H- F/V CONVERTER CIRCU
CHECK H.SYNC CIRCUIT
ON THE CRT PW8 PWE-2438
CHECK THE VOLTAGE FOR M
O F CONNECTOR 04-4
CHECK V.SYNC CIRCUIT
ON THE CRT PW8 PWE-2438
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IT ITE M 6