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7-1. Dynamic Focus
F
VH
HITACHI : 450V 180V
SAMSUNG : 370V 180V
F
VH
2.0V
1V
0V
Focus is poor
F
VV
Is the
waveform of the
DF pin in HVG (pin 1)
correct?
F
VV
No
Is the
collector voltage
of the Q605
about 650V?
No
Is the
base voltage
waveform of the
Q605 correct?
Yes
Is the
waveform of
the pin 13 in IC501
0.8V
correct?
Yes
Trouble in D604, D605.
Yes
Yes
No
No
24
1. Check the CRT socket
or connector wire.
2. Trouble in HVG or CRT.
1. Check the waveform of
the pin 1 of HVG.
2. Check D620, D619.
1. Check the 12V DC line.
2. Check Q607, Q602,
Q603, Q605 and Q604.
3. Check the waveform of
pin 13 in IC501.
4. Check the DZ610, DZ611.
Trouble in IC501.
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