Safety Related Adjustment; Hv Hold Down Adjustment - Sony KP-41DS1U Service Manual

When replacing the following components marked with ] on
the schematic diagram, always check hold-down voltage and if
necessary re-adjust.
Part Replaced ([)
Part Replaced (])
E Board C515, C516,
L506, Q502,
R517, T502,
G Board IC6008
5-1. HV HOLD-DOWN ADJUSTMENT
1. Remove CN810. Connect HV meter to HV Block.
2. Connect External Power Supply to CN810 2 pin (+135 V)
and 1 pin (GND).
Power
Supply
Fig. 5-1
Fig. 5-2
SECTION 5

SAFETY RELATED ADJUSTMENT

R1
C554, D504, D507,
R1, R514, R516,
T504 (FBT)
+
2
CN810
–
1
Remove the cap off
from the unused
terminal and connect a
static voltmeter there.
E BOARD
CN505
CN505
3. Turn on the set.
4. Slowly up the supply voltage from 135 V to 155 V.
5. Receive dot picture and set PICTURE/BRIGHTNESS to
minimum.
6. Slowly up the voltage until hold-down circuit works (pic-
ture disappear).
7. Read the HV meter of peak HV voltage.
Spec : 34.5 ±0.75 KV
8. If Hold-down voltage is less than 33.75 KV then solder
R1 = 820 K.
9. If hold-down voltage is over than 35.25 KV then take-off
R514 and solder R1 = 9.1 K.
– 49 –
KP-41DS1U/PZ1B/PZ1D/PZ1E
– CONDUCTOR SIDE –
CN810
Fig. 5-3
R1
Fig. 5-4
RM-892