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7-1. Dynamic Focus
F
VH
ORION
: 300V 150V
F
VH
4.5V
2V
0V
F
VV
Focus is poor
DF
waveform
Is the
waveform of the
DF pin in FBT
F
correct?
VV
No
Is the
cathode voltage
of the D705
about 700V?
Yes
Is the
base voltage of
the Q703 about
12V?
Yes
Is the
waveform of
the pin 8 in IC501
DF
correct?
waveform
Yes
0.8V
Trouble in Q701, Q702
* Check after adjusting the static focus
finely by VR in FBT
Yes
No
No
No
23
1. Check the CRT socket
or connector wire
2. Trouble in FBT or CRT
1. Check the waveform of
the pin 4 of FBT.
2. Check D705
1. Check the 12V DC line.
2. Check Q703, Q704
Trouble in IC501 or C523
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