Sony PVM-1341 - Page 18

PVM-1341/13420/1343MD
SECTION 4
SAFETY RELATED ADJUSTMENTS
I B+ MAX CONFIRMATION (HR690) I
The following adjustments should always be performed
when replacing the following components (marked with
[;jj on the schematic diagram).
Ciiii1 on F board : IC601, 1~602, IC651, D654, D655,
C658, C659, R634, R652, R653,
R654, R655, R656, R657, R665,
R671, R6130, RV601
1. Supply 130 ::g-
0
v AC to with variable auto-trans-
former.
2. Receive a dot signal.
3. • CONTRAST ·•·········· Minimum
• BRIGHTNESS ., ......• Minimum
4. Connect a digital multimeter to TP91.
5. Confirm the voltage of TP91 is less than 118.2
V DC when. rotate RV601 oh F board fully
clockwise.
6. If step 5 is not satisfied, readjustment should be
performed by altering the resistance value of R690
(B).
7. Receive a dot signal.
8. Disconnect A-22 connector (ABL JIG) on A board
and connect an ammeter.
9. Adjust BRIGHTNESS and CONTRAST so that the
current to 70 ±30 µA.
1 O. Adjust RV601 on F board so that voltage of TP91
is 115.5 ±0.3 V DC.
11. Supply 90 ±5.0 V AC to with variable auto-
transformer.
12. Receive entire white sjgnal.
13. • CONTRAST ············ Maximum
• BRIGHTNESS ·•······· Maximum
14. Confirm the voltage of TP91 is more than 113.0
V DC.
-17-
CONFIRMATION WHEN REPLACING H.V.R
(High Voltage Resistor)
The following adjustment should be confirm the output
voltage when replacing HVR.
1. Receive an entire white signal.
2. • CONTRAST ············ Maximum
• BRIGHTNESS ········· Maximum
3. Connect a digital multimeter to the A-20 connector
side lead of R804:•
4. Confirm the voltage is 14.1 ± 1.0 V DC.
H R500, CONFIRMATION METHOD (HOLD-DOWN
CONFIRMATION) AND READJUSTMENTS
The following adjustrl}ents. should always be performed
when replacing the following ,components (marked with
~ on the schematic diagra
0
m).
~ on A board : IC501, 0503, 0504, 0505, 0506,
D509, D510, C505, C520, C524,
C525, C526, C527, C528, C529,
C530, C531, R500, R506. R516,
R517, R518, R519, R520, R521.
R522, R523, R524, R525, R526,
R528, R804, NL501, HVR
1. Receive an entire white signal.
2. • CONTRAST ············ Maximum
• BRIGHTNESS ········· Maximum
3. Connect a digital multimeter to the A-20 connector
side lead of R804.
4. Confirm the voltage is 14.1 ± 1.0 V DC.
5. Receive a dot signal.
6. Disconnect A-22 connector (ABL JIG) on A board
and connect an ammeter.
7. Adjust BRIGHTNESS and CONTRAST so that the
current to 70 ± 30 µ A.
8. Apply an external DC voltage gradually to the A-
20 connector side lead of R804, and when the
voltage becomes 16.4 ±0.1 V DC, confirm the
HOLD- DOWN circuit operates immediately and
raster disappears.
9. With the same procedure of item 8, when the
voltage becomes 15.8 ±0.1 V DC, confirm the
HOLD-DOWN circuit doesn't operate.
1 0. Receive an entire white signal.
11. Adjust with BRIGHTNESS and CONTRAST volumes
so that the current to 600 ±40 µ A.
12. Apply DC voltage to the A-20 c9nnector side lead
of R804, and when the voltage becomes 15.8 ± 0.1
V DC, confirm . the HOLD-DOWN circuit operates
immediately and raster disappears.
13. With the same procedure of item 8, when the
voltage becomes 15.2 ±0.1 V DC, confirm the
HOLD-DOWN circuit doesn't operate.
14. When step 4 to 13 is not satisfied, readjustment
should be performed by altering the resistance
value of R500 CH).