NEC MultiSync V520, Service Manual

Page: 39 / 104

5. NO RASTER
CHECK
U301 PIN 3, U402 PIN 4
H/V SYNC
NO RASTER
POWER SUPPLY
CHECK
CHECK
B+
CHECK
U301 PIN 7, U402 PIN 23,24
H/V SYNC
CHECK
T301 PIN 3 VOLTAGE
68V(AT H-FREQ.
31.5KHz)
TROUBLE IN
MCU U701
TROUBLE IN
U301, U402
TROUBLE IN
U102,Q102,D114,D111,L102
OR DEFLECTION YOKE
TROUBLE IN
Q307, Q308,T302, D307,
D308
CHECK Q307
COLLECTOR ABOUT
1050Vp-p
CHECK G1
VOLTAGE ABOUT
-45~65V
TROUBLE IN
Q304, Q305, Q306, ZD303
D318, T301, C344
TROUBLE IN
G2 VOLTAGE
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
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