Trouble in I C42
Trouble in 042, 043
or H.Drive circuit
Trouble in H.out
044
0V or
low
0V or
low
No
Pin#6 signal level
Check Connector
Pin # 7 voltage level
Normal
Check CRT Display
Check DC Fuse 2 (A)
Normal
Check base voltage level of 042
(H. predrive)
: Normal
Check collector voltage level of
043 (H.drive)
1 Normal
Check base or emitter of signal
level of 044 (H.out)
Normal
Trouble in high voltage circuit
Check +B line voltage of +40V. +G2
-26-
Zero or
low
0V or
low
Normal
Trouble in logic
Check DC voltage with
no load
0V or low
J Trouble in External Power Supply
Open
Replace Fuse
Open
Disconnect the lead irom
Base of H.out transistor
Fuse OK
Trouble in H.out
transistor
044 high voltage
shorted
Fu1e Open
DC power
supply ,h orted
+B line