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Safety Related Adjustments; B+ Voltage Check; B+ Voltage Check In Ac Operation - Sony TRINITRON PVM-8042Q Service Manual

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The "4-1. B+ + + + + Voltage Check" and "4-2.
Note:
Protection Circuit (Hold-down circuit) Check"
should always be performed when replacing
the following components marked with
on the schematic diagram.
D board
components ..... RV833, RV1603
components ..... C519, C843, C844, C845, C846, C847,
C848, C1601, C1602, D835, D836,
D1601, D1603, IC502, Q833, Q834,
Q835, Q836, Q1601, Q1602, Q1603,
R523, R850, R851, R852, R853, R854,
R855, R856, R857, R858, R859, R860,
R861, R862, R863, R1601, R1602,
R1603, R1604, R1605, R1606, R1607,
R1608, R1628, R1629, R1630, RV833,
RV1601, RV1603
G board
components ..... RV651
components ..... C654, IC601, IC651, PH601, R653,
R655, R656, R657, RV651
P board
components ..... C814, NL801, T802 (FBT)
L1602
4-2-1
DC
+
POWER
_
SUPPLY
+0.1
9.4
Vdc
_0
MIC
S
Chassis
SECTION 4

SAFETY RELATED ADJUSTMENTS

RY1601
6
RV1601
C1605
4-1-2
+
DVM
_
4-1. B+ + + + + VOLTAGE CHECK
4-1-1. B+ + + + + Voltage Check in AC Operation
and
Note:
Be sure to use the NF power supply. If not, use
an ordinary variable step-up transformer of its
distortion factor is 3 % or less.
Input signal:
Controls:
+5
1. Input 130
Vac from the NF power supply (or
_0
variable step-up transformer of its distortion factor is 3 %
or less).
2. Connect the digital voltmeter to pin 6 of RY1601 and
ground on the D board.
3. Make sure that the voltage is within the following
specification.
Specification:
RY1601 Pin-6 (D board) = 41.9 Vdc or less
4. If the above voltage is out of specification, adjust
voltage with RV651 on the G board. After adjusting, be
sure to apply paint to RV651.
TP85
4-1-1
+
0.1 uF
DVM
_
100 V
TO P BOARD
CN801-8
Dot pattern signal
BRIGHT 8 Minimum
CONTR 8 Minimum
RV833
8
CN503
4-2-2
4-2-2
+
DC
+
A
POWER
_
SUPPLY
4-1

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