Safety Related Adjustments; A Board; G Board - Sony Trinitron KV-32S40 Service Manual

R530, R531 CONFIRMATION METHOD (HOLD-DOWN CONFIRMATION) AND READJUSTMENTS
Always perform the following adjustments when replacing the following
components marked with a ] mark on the schematic diagram:

A BOARD:

IC351, IC501, D519, D520, D521, C531,
C532, R387, R529, R530, R531, R532,
R533, R550, T503

G BOARD:

IC643, R661
Step 1 Preparation before Confirmation
Turn the POWER switch ON.
Input a white signal and set the PICTURE and BRIGHT
controls to maximum.
Confirm that the voltage at the check terminal of TP85 is
more than 18.0 V DC when the set is operating normally.
At AC input: 120.0
or 220.0 2.0 VAC (
for 34SL40C/34VL65C/37VL65C only
Step 2
Input a white signal and verify that I ABL is within the
specified range: 2160 + 100 A.
At AC input: 120.0
or (
220.0 2.0 VAC
ammeter
3.0 mA DC
range
ABL
Step 3
Record the voltage between TP85 and ground.
Step 4
Using an external DC power supply, apply voltage
between TP85 and ground.
Increase the voltage gradually and confirm that the
holdown works (raster disappears) at lower than the
voltage recorded in Step 3.
Lower than 22.05 V DC
At AC input: 120.0
or (
220.0 2.0 VAC

SAFETY RELATED ADJUSTMENTS

2.0 VAC
2.0 VAC
for 34SL40C/34VL65C/37VL65C only
T504
FBT
-
+
A
I ABL
2.0 VAC
for 34SL40C/34VL65C/37VL65C only
KV-32S40/32S45/34SL40/34SL40C/34SL40T/34SL45/35S40/35S45/37SL45/
SECTION 4
R531 R530
R531
DC Power Supply
A BOARD - CONDUCTOR SIDE
)
Step 5
Confirm that a voltage of more than 18.0 V DC appears
between TP85 and ground.
At AC input: 120.0
or
220.0 2.0 VAC
)
B+ VOLTAGE CONFIRMATION AND ADJUSTMENT
Always perform the following adjustments when replacing the
following components marked with ] on the schematic diagram:
G BOARD: IC643, R661
1) Using Variac, apply AC input voltage: 130 + 2.0 VAC
(or 220.0
2) Input a monoscope signal.
3) Set the PICTURE control and the BRIGHT control to
initial reset value.
4) Confirm the voltage of G BOARD CN641 between
pin 1 to ground is less than 135.5 + 1.0 V DC.
5) If step 4 is not satisfied, replace the R661and repeat the
above steps.
)
— 15 —
32V40/32V65/34VL65/34VL65C/35V65/37VL65/37VL65C
dejital
digital multimeter
multimeter
+
-
T503
T503
TP85
TP85
FBT FBT
R530
11
ammeter
ammeter
3mA dc range
3mA DC range
+
-
A
dc power supply
+
1T40 -
2.0 VAC
(
for 34SL40C/34VL65C/37VL65C only
for
2.0 VAC
34SL40C/34VL65C/37VL65C only
)
)