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Safety Related Adjustment; Hv Hold Down Adjustment - Sony KP-EF41ME3 Service Manual

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When replacing the following components marked with
on the schematic diagram, always check hold-down volt-
age and if necessary re-adjust.
Part Replaced ( )
Part Replaced ( )
E Board C515, C516, C554, D504, D507,
L506, Q502, R1,
R517, T502, T504 (FBT)
G Board IC6008
4-1. HV HOLD-DOWN ADJUSTMENT
1. Remove CN810. Connect HV meter to HV Block.
2. Connect External Power Supply to CN810 2 pin
(+135V) and 1 pin (GND).
Power
Supply
Fig. 4-1
Fig. 4-2
SECTION 4

SAFETY RELATED ADJUSTMENT

R1
R514, R516,
+
2
CN810
1
Remove the cap off
from the unused
terminal and connect a
static voltmeter there.
KP-EF41ME3/MN3/SN3, EF48MN3/SN3
E BOARD
3. Turn on the set.
4. Slowly up the supply voltage from 0V to 135V.
5. Receive dot picture and set PICTURE/BRIGHT-
NESS to minimum.
6. Slowly up the voltage until hold-down circuit works
(picture disappear).
7. Read the HV meter of peak HV voltage.
Spec: 34.5±0.75KV
8. If Hold-down voltage is less than 33.75KV then sol-
der R1=820K.
9. If hold-down voltage is over than 35.25KV then
take-off R514 and solder R1=9.1K.
– 29 –
– CONDUCTOR SIDE –
CN810
CN505
Fig. 4-3
CN505
R1
Fig. 4-4
RM-871

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