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DP-8 5 CHASSIS TROUBLESHOOTING
1.) No Raster and No Power
(De flee tion P WB)
(Sub
Deflection
PWB)
Check
1702
~~
pitI (18)
Hout.
Q751
normal?
+ pin (16)
Def HVcc
pin (3) -SDA2
(Data)
pin (4) -SC12
(Clock)
(Deflection
P WB)
Q701,
QP08,
DP4l
(Deflection
P WE)
(Deflection
PWB)
!Po wer P WBI
All LED's
Going
OF
at the same
time.
Yes
(Deflection
PWB)
Check
b Q777,
QHOl ,T751,
T752
(Power
PWB)
Check
Q913,
1905, 0954,
D961,
1904, Q915,
D955
with G and K o
I
Check
Q913
(De fleciion
P W5)
I
I
(Deflection
PWB)
(Deflection
PWB)
DP22
(+13OV)
DP15
(+13V)
Check
Check
EP98,
DPI 1,
EP94,
IP03,
Q777,
QHOl,
Vertical
Out 1601,
THOl,
DHll
,etc.
Q655,
Q656,
etc.
T
(Deflection
PWB)
Find which
LED is
going
Dark or OFF.
I
DP15
(+28V)
+ Check
EP96,
DPt2,
1 (Other
LED's
are going
OFF
71
a little latter)
+
(Deflection
P WB)
DP16
(-13V)
Check
EP95,
QPOl,
Vertical
Out 1601,
QKOl,
UKDG,etc.
One LED Going
OFF a little
before
the others.
(Deflection
P WB)
IK04,
IK05, etc.
v
llK04,
lK05,
etc.
/
PAGE 02-04
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