P A G E 0 9- 0 4
TROUBLE SHOOTING (NO R A S T ER NO POWER DP-8X Series Chassis.
DP-85 CHASSIS TROUBLESHOOTING
1.) No Raster and No Power
(Deflection PWB)
Does raster appear
with G and K of QP05
shorted?
(Deflection PWB)
Check
QP05
Yes
D
No
(Sub Deflection PWB)
Check I702
pin (18) Hout.
pin (16) Def HVcc
pin (3) -SDA2 (Data)
pin (4) -SCL2 (Clock)
(Deflection PWB)
Q701, QP08, DP41
(Deflection PWB)
Is base voltage
Q751 normal?
(0.45Vdc)
(Deflection PWB)
Check
Q777, QH01,T751, T752
Yes
(Deflection PWB)
No
(Deflection PWB)
Are voltages of both
ends of T751
(primary side) normal?
(Deflection PWB)
Check
T751, R754, R755,
EP96, LP13
No
(Power PWB)
Does raster appear
with G and K of
Q913 shorted?
(Power PWB)
Check Q913
Yes
E
No
(Power PWB)
(Power PWB)
Check
Q913, I905, D954, D961,
I904, Q915, D955
F
(Deflection PWB)
(Deflection PWB)
Find which LED is
going Dark or OFF.
(Other LED's are going OFF a little
latter)
(Deflection PWB)
DP22 (+130V)
Check
EP98, DP11,
Q777, QH01, TH01,
DH11,etc.
(Deflection PWB)
DP15 (+13V)
Check
EP94, IP03,
Vertical Out I601, Q655,
Q656, etc.
(Deflection PWB)
DP16 (-13V)
Check
EP95, QP01,
Vertical Out I601, QK01,
UKDG,etc.
(Deflection PWB)
DP21 (-28V)
Check
EP97, DP13,
IK04, IK05, etc.
(Deflection PWB)
DP15 (+28V)
Check
EP96, DP12,
IK04, IK05, etc.
Yes
28V
All LED's Going OF
at the same time.
All LED's Going OF
at the same time.
One LED Going OFF a little before the
others.
