Dynamic Focus - Daewoo 710C Service Manual

7-1. Dynamic Focus

F
VH
NEC : 300V 120V
SAMSUNG : 300V 120V
F
VH
5V
2V
0V
F
VV
Focus is poor
DF
waveform
Is the
waveform of the
DF pin in FBT
F
correct?
VV
Is the
cathode voltage
of the D614
about 510V?
Is the
waveform of
the pin 15 in IC501
DF
correct?
waveform
0.8V
1. Trouble in Q605, Q606,
Q607 and their ambient circuits.
2. Trouble in Q616, IC602
and their ambient circuits.
* Check after adjusting the static focus
finely by VR in FBT
Yes
No
No
Yes
No
Yes
23
1. Check the CRT socket
or connector wire
2. Trouble in FBT or CRT
1. Check the waveform of
the pin 1 of FBT.
2. Check D614
Trouble in IC501 or C513