Safety Related Adjustments; Diagrams - Sony KV-32XBR200 Service Manual

更多难得资料请到江南家电维修论坛免费下载！
KV-32XBR200/KV-36XBR200
http://bbs.520101.com
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 23.0 V DC when the set is operating normally.
At AC input: 120.0 ± 2.0 VAC
Step 2
Input a white signal and verify that I ABL is within the
specified range:
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.
Lower than 27.24 V DC
At AC input: 120.0 ± 2.0 VAC

SAFETY RELATED ADJUSTMENTS

2175 + 100 A.
µ
T503
FBT
T504
FBT
ammeter
3.0 mA DC
range
ABL
-
+
A
I ABL
SECTION 4
R531 R530 R530
R531
DC Power Supply
A BOARD - CONDUCTOR SIDE
Step 5
Confirm that a voltage of more than 23.0 V DC appears
between TP85 and ground.
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: IC643, R661
1) Using Variac, apply AC input voltage: 130 + 2.0 VAC
2) Input a monoscope signal.
3) Set the PICTURE control and the BRIGHTNESS control
to initial reset value.
4) Confirm the voltage of G BOARD CN641 between
pin 1 to ground is less than 136.5 + 1.0 V DC.
5) If step 4 is not satisfied, replace the R661and repeat the
above steps.
— 19 —
dejital
digital multimeter
multimeter
+
-
T503
T503
TP85
TP85
FBT FBT
11
ammeter
ammeter
3mA dc range
3mA DC range
+
-
A
dc power supply
+
-
1T40