Safety Related Adjustments; B (135V) Voltage Adjustments; High Voltage Regulator Check/Adjustment; High Voltage Hold-Down Check/Adjustment - Sony BVM-D32E1WA Maintenance Manual

+B (135V) Voltage Adjustments

Perform the following checks and adjustments when the
following parts ( on the schematic diagram) have been
replaced.
G board ............. IC202
1. Connect a digital voltmeter to TP1 of the G board.
(GND is TP6 of the G board)
. . . . . Use a digital voltmeter with more than 4 digits.
2. Confirm that the TP1 voltage value is as shown below.
135.2 V ± 0.8 VDC

High Voltage Regulator Check/Adjustment

( RV501)
Perform the following checks/adjustments when the
following parts ( on the schematic diagram) have been
replaced.
PA board ........... R501, R502, R505, R506, R508,
R509, R510, R512, R513, R801,
R802, R804, RV501, IC501, IC805
1. Turn OFF the power.
2. Connect the static voltmeter to the anode cap of the
CRT.
. Static voltmeter :
Calibrated to an input imped-
ance of above 2 x 10 9
(For example, Singer ESH-27X or ESH-23X)
3. Turn ON the power.
4. Input the HD (1125) monoscope signal.
5. Press the BRIGHTNESS VR and CONTRAST VR
buttons to set the PRESET state.
[ The LED (green) on the button goes off. ]
6. Check that the high voltage value is within the follow-
ing range.
27.0 ± 0.15 kV
7. If 6 is not satisfied, replace RV501 of the PA board
and adjust RV501 to satisfy the specifications.
8. Remove the static voltmeter.
9. If RV501 has been replaced at step 7, fix it with epoxy
resin (made by DP-190 3M) after adjusting the RV.
BVM-D32E1WA/D32E1WE/D32E1WU
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Section 4

Safety Related Adjustments

Ω.

High Voltage Hold-Down Check/Adjustment

( RV503)
Perform the following checks/adjustments when the
following parts ( on the schematic diagram) have been
replaced.
PA board ........... R524, R525, R526, R527, R530,
RV503, D502, D505, D902
PC board ........... R812, D801
1. Turn OFF the power.
2. Connect the static voltmeter to the anode cap of the
CRT.
. Static voltmeter :
Calibrated to an input imped-
ance of above 2 x 10 9
(For example, Singer ESH-27X or ESH-23X)
3. Connect a 200 kΩ variable resistor between TP501
and TP504 (GND) of the PA board.
(Set the resistance of the 200 kΩ resistor to the
maximum value.)
4. Turn ON the power.
5. Input the HD (1125) cross-hatch signal.
6. Press the BRIGHTNESS VR and CONTRAST VR
buttons to set the PRESET state.
[ The LED (green) on the button goes off. ]
7. Cut-off the R,G,B. [ Turn ON the SHIFT button
(orange LED lights up) and turn ON the R, G, and B
buttons (LED lights up)].
8. Decrease the resistance of the 200 kΩ variable resistor
connected to TP501, and check that the high voltage
value drops suddenly at the following values.
30.0 ± 0.5 kV
9. If 8 is not satisfied, replace RV503 of the PA board
and adjust RV503 to satisfy the specifications.
10. Remove the 200 kΩ variable resistor.
11. Check that the high voltage values satisfy the follow-
ing values.
27.00 ± 0.15 kV
12. Remove the static voltmeter.
13. If RV503 has been replaced at step 9, fix it with epoxy
resin (made by DP-190 3M) after adjusting the RV.
Ω.
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