Check +B voltage
No
raster
Check heater voltage and video
amf. voltage
Check pin 20 voltage in
CPU
Check every voltage
in CPU
Check 300V between
C1650
Check N801 Parts connected
Check R505
Check CRT cathode
voltage
Check V403 T444
Replace CRT
Check V402
Check pin40 in N201
output
Check R
、
G
、
B signal of N201
Check N501 and external circuit
abnormal
normal
no
yes
abnormal
normal
oV
5V
26a