18
5. Horizontal Output Circuit
Is
B+ line boltage
normal?
Is
Q506 base
waveform
normal?
Trouble in power
supply circuit
Refer to trouble
in power supply
unit
Trouble in FBT
Trouble in Horizontal
output circuit
(No Raster)
Yes
No
Q505 and its
ambient cirucit
Trouble in Q505, T501
If the holddown circuit stops the
horizontal oscillator during the check,
turn off the power then turn on again
about 10 seconds later
Yes
Yes
Yes
Check the circuit of
P. S. U
No
Trouble in IC501
Yes
Trouble in H.sync line
11V p-p
12V p-p
14.5Vp-p
Yes
IS
Q505 Gate
waveform
normal?
Is
the input H.sync
correct?
Is
IC501 7pin
H.DRV waveform
normal?
Is
IC501 pin 9
voltage about
12V?
No
No
No
No
MODE
B+ Voltage
VGA
72Vdc
Super VGA
86Vdc
54KHz
124Vdc
Summary of Contents for 432X
Page 31: ...PCB LAYOUT 29 Main PCB Component Side...
Page 32: ...30 Main PCB Solder Side...
Page 33: ...31 Video PCB Component Side Video PCB Solder Side...
Page 34: ...32 SCHEMATIC DIAGRAM...
Page 35: ...33...
Page 36: ...34...
Page 37: ...35...
Page 38: ...EXPLODED VIEW DIAGRAM 36...
