Technical information

1918
5. Horizontal Output Circuit
Is the
B+line voltage
over 50V?
Is the H-out
waveform of IC501
normal?
Trouble in IC501
Trouble in Horizontal
output circuit
(No Raster
Yes
No
Is the Collector
wave form of
Q504 normal?
Yes
Yes
Yes
Trouble in Q505
No
No
No
Trouble in Q505 and
its ambient circuit.
3V
0V
50V
Is the Drain
waveform of
Q507 normal?
Trouble in 50V
Trouble in Q503, Q506
0V
0V
140V
4. Abnormal OSD Font
Is menu
key selected?
Is OSD Font
exist?
* If menu key selected.
Is the H/V
Blanking
signal normal?
Abnormal OSD Font
Check the
blanking
pulse circuit
Troubie in
IC801 or its
ambient circuit
One color is
missing
No
Yes
Yes
Yes
No
MODE B+ Voltage
31KHz 60Vdc
37KHz 70Vdc
43KHz 80Vdc
54KHz 105Vdc
60KHz 120Vdc
68KHz 145Vdc