![background image](http://html.mh-extra.com/html/nec/diamond-scan-51/diamond-scan-51_service-manual_249520037.webp)
3. VIDEO NOISE, UNSYNCHRONOUS
CHECK HORIZONTAL
FREQUENCY C114 TO GND
CHECK
Q101 G-S FREQUENCY
SYNCRONIZE
WITH H-SYNC
CHECK HORIZONTAL
FREQUENCY C132 TO GND
CHECK C132, R139,
D115, R138, R140
NORMAL OPERATION
CHECK
Q101 G-S FREQUENCY
SYNCRONIZE
WITH H-SYNC
CHECK C114, R116
D109, R115, R117
YES
YES
NO
NO
NO
NO
34
Summary of Contents for Diamond Scan 51
Page 9: ...6 MultiSync MV521 Diamand Scan 51 ...
Page 71: ...11 Monolithic triple 13 5nS CRT driver 68 ...
Page 72: ...69 ...
Page 73: ...70 ...
Page 74: ...71 ...
Page 103: ...95 SCHEMATIC DIAGRAMS 1 Video Board ...
Page 104: ...96 2 Main Board ...