– 31 –
KP-41PX1/41PX1K/41PX1R
K
RM-892
RM-892
RM-862
SECTION 5
SAFETY RELATED ADJUSTMENT
When replacing the following components marked with
]
on
the schematic diagram, 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. Remove CN810 and connect External Power Supply to
CN810
2
pin (+135 V) and
1
pin (GND).
Part Replaced (
]
)
E Board
C515,
C516,
C554,
D504,
D507,
L506,
Q502,
R1,
R514,
R516,
R517,
T502,
T504 (FBT)
G Board
IC6005
Part Replaced (
[
)
R1
3. Turn on the set.
4. Receive the Dot signal and set PICTURE/BRIGHTNESS
to minimum.
5. Slowly up the supply voltage from 0 V to 135 V until hold-
down circuit works (picture disappear).
6. Read the HV static voltmeter of peak HV voltage.
Spec : 33.7 to 36.0 KV
7. If Hold-down voltage is less than 33.7 KV then solder
R1 = 820 K and check if the voltage is within the spec.
8. If hold-down voltage is over than 36.0 KV then take-off
R514 and solder R1 = 9.1 K and check if the voltage is
within the spec.
+
–
2
CN810
Power
Supply
1
E BOARD
– CONDUCTOR SIDE –
CN810
CN505
CN505
R1
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.
