No Raster - NEC MultiSync 75F-3 Service Manual

5. NO RASTER

NO RASTER
YES
CHECK
YES
CHECK
U302 PIN 14, 15
H/V SYNC
YES
CHECK
U302 PIN 18, 19, 8
SYNC
YES
CHECK
T301 PIN 3 VOLTAGE
56V, 68V(AT H-FREQ.
31.5KHz)
YES
CHECK Q307
COLLECTOR ABOUT
1050Vp-p
YES
CHECK G1
VOLTAGE ABOUT
-45~65V
YES
PROBLEM IN
G2 VOLTAGE
B+
NO
NO
NO
NO
NO
NO
34
POWER SUPPLY
CHECK
PROBLEM IN
MCU U701
PROBLEM IN
U701, U302
PROBLEM IN
U302, Q319, D335, L304
OR DEFLECTION YOKE
PROBLEM IN
Q307, Q308,T302,
D307, D308
PROBLEM IN
Q305, Q306, ZD303
D318, T301, C344