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Safety Related Adjustments; Hv Regulation Circuit Check And Adjustment; Hv Hold Down Circuit Operation Check And Adjustment; B Max Voltage Confirmation - Sony KDP-57XBR2 Service Manual

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[ D BOARD]
5-1. HV REGULATION CIRCUIT CHECK AND
ADJUSTMENT
ollowing components marked with ] on the
When replacing the f
schematic diagram always check HV regulation, and if neces-
sary re-adjust.
[
: VR8001
]
: C8079, C8083, C8090, C8129, D8013, D8015,
D8038, D8043, IC8006, Q8021, R8055, R8099,
R8102, R8128, R8129, R8131, R8139, R8140,
R8142, R8153, R8163, R8223, R8230,
T8004 (LOT), T8005 (FBT), HV block, D board
OPERATION CHECK
1. Receive the all white signal.
2. Set PIC MAX/BRT CENT.
3. Confirm that the voltage between CN8015 1 pin and GND
is less than 7.80VDC.
HV REGULATION ADJUSTMENT
1. Connect a HV static voltmeter to the unconnected plug of
the high-voltage block.
2. Power on the set.
3. Repeat steps 1 and 2 as above.
4. Confirm that the static voltmeter reading is 31.0 ± 0.4V.
5. If not, adjust with VR8001 to the specified value.
6. After adjustment, put the VR cover on VR8001 as shown
below and apply sufficient amount of epoxy resin around
VR8001.
Fig. 5-1
Fig. 5-2
SECTION 5

SAFETY RELATED ADJUSTMENTS

Remove the cap off
from the unused
terminal and connect a
HV static voltmeter
there.
epoxy resin
VR8001
5-2. HV HOLD DOWN CIRCUIT OPERATION
CHECK AND ADJUSTMENT
When replacing the following components marked with ] on
the schematic diagram always check hold-down voltage and if
necessary re-adjust.
[
: VR8002
]
: C8054, C8086, C8088, C8100, C8104, C8118,
C8123, C8124, D8019, D8020, D8022, D8028,
D8036, FB8001, IC8008, Q8035, Q8038, R8035,
R8043, R8159, R8166, R8171, R8196, R8201,
T8004 (LOT), T8005 (FBT), HV block, D board
OPERATION CHECK
1. Receive the dot signal.
2. Set PIC MIN/BRT MIN.
3. Confirm that the voltage between cathode of D8038 (JW171)
and GND is more than 23.0V DC.
4. Using an external DC Power supply, apply the voltage shown
below between cathode of D8038 (JW171) on "D" and GND,
then confirm that the HV-Prot circuit works.(Raster disappears.)
Apply DC voltage: Less than 29.05V DC.
HV HOLD-DOWN ADJUSTMENT
1. Connect a HV static voltmeter to the unconnected plug of
the high-voltage block.
2. Power on the set.
3. Connet an externel 10k VR at CN8015 and adjust this VR
so that the high voltoge is 34.50kV.
4. Adjust VR8002 to the point that the HV-Prot circuit works
(Raster disappears) at 34.50 ± 0.50kV reading on the static
voltmeter.
5. After adjustment, put the VR cover on VR8002 and apply
sufficient amount of epoxy resin around VR8002 as the same
manner for VR8001.
[ G BOARD]

5-3. +B MAX VOLTAGE CONFIRMATION

The following adjustments should always be performed
when replacing IC6101.
1. Supply 130VAC to variable autotransformer.
2. Receive dot signal pattern and set the PICTURE and
BRIGHTNESS settings to their minimum.
3. Confirm the voltage of TP6102 [TP. +B 135V] is less than 137.0Vdc.
4. If step 3 not satisfied , replace IC6101 and repeat above steps.

5-4. +B OVP CONFIRMATION

1. Add to low voltage power supply between to TP6101 [TP. OVP]
and ground.
2. Supply 120VAC to variable autotransformer.
3. Power on the Set and receive dot signal pattern.
4. Set the PICTURE and BRIGHTNESS settings.
5. Check the OVP is activated. Operate : 2.60 ± 0.10V
– 51 –
KDP-57XBR2/65XBR2
RM-Y185

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