NEC AS120-1 Service Manual page 12

NO CHARACTER
CHECK
IC302 PIN 5, 6, 7 ?
YES
CHECK
IC302 PIN 19, 20, 21
PIN 10 (5V) ?
YES
CHECK
IC303 PIN 1, 3, 5
PIN10 (12V),
PIN 6 (80V) ?
YES
CHECK
R, G, B CATHODE
VOLTAGE?
YES
TROUBLE IN
CDT SOCKET
2. NO CHARACTER
NO
NO
NO
NO
- 13 -
TROUBLE IN
P301, SIGNAL CABLE,
PC SIGNAL
TROUBLE IN
IC302, P302
TROUBLE IN
IC303
TROUBLE IN
IC304