Hitachi 61HDX98B Manual page 96

T R O U B L E S H O O TING (NO R A S T E R N O P O W E R
DP-85 CHASSIS TROUBLESHOOTING
1.) No Raster and No Power
(Deflection PWB)
Does raster appear
with G and K of QP05
shorted?
Yes
(Deflection PWB)
Check
QP05
E
(Power PWB)
Does raster appear
with G and K of
Q913 shorted?
(Power PWB)
Check Q913
(Deflection PWB)
F
(Deflection PWB)
Find which LED is
going Dark or OFF.
(Other LED's are going OFF a little
latter)
One LED Going OFF a little before the
others.
D
(Deflection PWB)
All LED's Going OF
at the same time.
(Deflection PWB)
No
Is base voltage
(Deflection PWB)
Are voltages of both
(primary side) normal?
(Power PWB)
All LED's Going OF
at the same time.
No
(Power PWB)
Q913, I905, D954, D961,
I904, Q915, D955
Yes
(Deflection PWB)
DP22 (+130V)
Check
EP98, DP11,
Q777, QH01, TH01,
DH11,etc.
(Deflection PWB)
DP16 (-13V)
Check
EP95, QP01,
Vertical Out I601, QK01,
UKDG,etc.
DP-8 X S eries Chassis.
No
Q751 normal?
(0.45Vdc)
Yes
ends of T751
28V
Yes
(Deflection PWB)
Q777, QH01,T751, T752
Check
(Deflection PWB)
DP15 (+13V)
Check
EP94, IP03,
Vertical Out I601, Q655,
Q656, etc.
(Deflection PWB)
DP21 (-28V)
Check
EP97, DP13,
IK04, IK05, etc.
(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
No (Deflection PWB)
Check
T751, R754, R755,
EP96, LP13
Check
(Deflection PWB)
DP15 (+28V)
Check
EP96, DP12,
IK04, IK05, etc.
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