– 23 –
KP-44PX3
RM-945
Part Replaced (
)
D Board
C8129, D8038, D8013, Q8024, R8002,
R8055, R8102, R8218, R8219, R8223
R8230, R5140, R9901, T5102, T5104,
T8005 (FBT)
CN8015
R9901
D BOARD
– CONDUCTOR SIDE –
CN8015
CN8006
+
–
1
CN8006
Power
Supply
2
When replacing the following components marked with below
always check hold-down voltage and if necessary re-adjust.
5-1. HV Hold-Down Adjustment
1.
Connect HV static voltmeter to HV Block.
2.
Mount a resistor (R9901 : 43 k , 1/4 W, METAL
FILM) at CN8015.
3.
Remove CN8006 and connect External Power Supply
to CN8006 1 pin (+135 V) and 2 pin (GND).
4.
Turn on the set.
Part Replaced ( )
R9901
5.
Receive the Dot signal and set PICTURE/
BRIGHTNESS to minimum.
6.
Slowly up the supply voltage from 0 V to 135 V
until hold-down circuit works (picture disappears).
7.
Read the HV static voltmeter peak HV voltage.
Spec : 33.7 ~ 35.3 kV
8.
If Hold-down voltage is less than 33.7 kV then
replace R9901 43 k with that of 39 k , and
check if the voltage is within the spec.
9.
If hold-down voltage is greater than 35.3 kV then
replace R9901 of 43 k with that of 47 k , and
check if the voltage is within the spec.
Fig. 5-1
Fig. 5-2
Fig. 5-3
Fig. 5-4
Remove the cap off
from the unused
terminal and connect a
HV static voltmeter
there.
SECTION 5 SAFETY RELATED ADJUSTMENT
