Sony KP-51DS1U, Руководство по обслуживанию

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– 33 –
KP-51DS1U
RM-892
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. Remove CN810. Connect HV meter to HV Block.
2. 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 IC6008
Part Replaced (
[
)
R1
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.
+
–
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
static voltmeter there.