Safety Related Adjustments - Sony TRINITRON KV-36FS10 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: IC355, IC501, D302, D519, D520, D521, C531,
C532, Q301, R356, R359, R361, R387, R529,
R530, R531, R532, R533, R550, T503
G BOARD (KV-32FS10, 32FV15, 32XBR250, 36FS10,
36FV15, 36XBR250): IC643, R661
GA BOARD (KV-34FV10, 34FV15, 34FV15C, 34FV15K,
34FV15T, 34FX250C, 38FV15K, 38FX250, 38FX250C,
38FX250T): IC6003, R6088
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, when the set is operating normally, the
voltage at check terminal TP85 is more than 23.0 V DC.
At AC input: 120.0
Step 2
Input a white signal and verify that I ABL is within the
2062.5 + 100 A,
specified range:
+B = 135.5 + 1 VDC .
At AC input: 120.0 2.0 VAC
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.
KV-32FS10/32FV15/32XBR250/34FV10/34FV15/34FV15C/34FX250C/34FV15K
34FV15T/36FS10/36FV15/36XBR250/38FX250/38FX250C/38FX250T/38FV15K

SAFETY RELATED ADJUSTMENTS

2.0 VAC
T503
FBT
ammeter
3.0 mA DC
range
ABL
-
+
A
I ABL
SECTION 4
R531 R530
R531
DC Power Supply
32" Lower than 26.95 + (-0.1) V DC.
At AC input: 120.0
36" Lower than 22.05 + (-0.1) V DC.
At AC input: 120.0
A BOARD - CONDUCTOR SIDE
Step 5
Confirm that a voltage appears between TP85 and
ground, of more than 23.0 V DC.
At AC input: 120.0 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 (KV-32FS10, 32FV15, 32XBR250, 36FS10,
36FV15, 36XBR250): IC643, R661
GA BOARD (KV-34FV10, 34FV15, 34FV15C, 34FV15K,
34FV15T, 34FX250C, 38FV15K, 38FX250, 38FX250C,
38FX250T): IC6003, R6088
1) Using Variac, apply AC input voltage: 130.0
2) Input a monoscope signal.
3) Set the PICTURE control and the BRIGHT control to
initial reset value.
4a) (G Board Models) Confirm the voltage of G Board
CN641 between pin 1 to ground on "G" PWB is less
than 136.5 + 1.0 V DC.
4b) (GA Board Models) Confirm the voltage of GA
Board CN6007, between pin 1 to ground on "GA"
PWB is less than 136.5 + 1.0 V DC.
5a) (G Board Models) If step 4a is not satisfied, replace
R661 and repeat the above steps.
5b) (GA Board Models) If step 4b is not satisfied, replace
R6088 and repeat the above steps.
— 21 —
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
2.0 VAC
2.0 VAC