Safety Related Adjustment; Safety Related Adjustments - Sony TRINITRON PVM-8041Q Service Manual

PVM-8041Q/8044Q
SECTION 4
SAFETY RELATED ADJUSTMENT
4-1. SAFETY RELATED ADJUSTMENTS
| B+ MAX CONFIRMATION ( B RV651)~|
The following adjustments should always be performed when replacing
thefollowingcomponents (marked with
3
on the schematic diagram).
3 on G board : (Power supply block)
IC601, IC651, PH602, C655, R653, R655, R656. R657, RV651.
1. For US model, supply 130V !jj'5 v AC with variable auto¬
transformer.
2. Receive a dot signal.
3. • CONTRAST.Minimum
• BRIGHTNESS.Minimum
4. Connect a digital multimeter to RY1601 pin-® of D board.
5. Turn RV651 on the G board fully clockwise. Confirm that the
voltage of RY1601 pin-® is less than 41.9V DC.
6. If step 5 is not satisfied, readjust theRV651. After adjusting, fasten
RV651 in place with epoxy.
B+ MAX IN DC POWER INPUT MODE, CONFIRMATION
( B RV1603)
The following adjustments should always be performed when replacing
thefollowingcomponents(markedwith 3 on the schematic diagram).
3
on D board :
Q1601,Q1602,Q1603,D1601,D1602, D1603,D1604,D1605,C1601,
C1602,R1601,R1602,R1603,R1604,R1605,R1606,R1607,R1608,
R1629, R1628, R1630, R V1601, R V1603.
HOLD-DOWNCIRCUITCONFIRMATION( B RV833)AND
READJUSTMENTS
The following adjustments should always be performed when replacing
thefollowingcomponents (marked with
3
on the schematic diagram).
3
on D board:
1C502, Q833, Q834, Q835, Q836, D835, D836, C519, C814, C843,
C844, C845, C846, C847, C848, RV833, R523, R850, R851, R852,
R853, R854, R855, R856, R857, R858, R859, R861, R862, R863,
NL801.
3
on P board:NL801 ,T802 (FBT)
1. Receive an entire white signal.
2. • CONTRAST.Maximum
• BRIGHTNESS.Maximum
3. Connect a digital multimeter to the TP85 (CN503 pin-®).
4. Confirm the voltage is 14.1 ± 3.0V DC.
5. Receive a dot signal.
6. Connect an ammeter between D board CN503 pin-® and P board
CN801 pin-®.
7. Adjust BRIGHTNESS and CONTRAST so that the current is
IABL= 160±30|iA.
8. Apply an external DC voltage gradually to TP85. When the
voltage becomes 18.5V ± 0.1V DC, confirm the HOLD-DOWN
circuit operates immediately and raster disappears.
9. When external DC voltage at TP85 becomes 17.5V ± 0.1 V DC,
confirm the HOLD-DOWN circuit doesn't operate.
10. Receive an entire white signal.
11. Adjustwith BRIGHTNESS and CONTRAST controls so that the
current is Iabl = 520 ± 30 |iA.
12. Apply DC voltage of 17.8V ± 0.1V to TP85. Confirm the HOLD¬
DOWN circuit operates immediately and raster disappears.
13. With the same set-up as steps 10 and 11, supply 16.8 V ± 0.1V DC
to TP85. Confirm that the HOLD-DOWN circuit doesn ' t operate.
14. When above specifications are not satisfied, readjust RV833.
After adjusting, fasten RV833 in place with epoxy.
1. Supply DC 12V * 1 2 3 4 5 6 V from DC 12V IN connector.
2. Receive a dot signal.
3. • CONTRAST.....Minimum
• BRIGHTNESS.Minimum
4. Connect a digital multimeter to C1605 positive + side of D board.
5. Turn RV1601 on the D board fully clockwise. Confirm that the
voltage of C1605 + pin is less than 41.9V DC.
6. If step 5 is not satisfied, readjust the RV1603. After adjusting,
fasten RV1603 in place with epoxy.
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