Sony KLV-32R4 C Series Service Manual page 116

3-10. Tact Key
3-10-1. Switch Unit Buttons
Switch Unit NOT FUNCTIONING
Check Wire Harness
And Connector
Connection?
OK
** Check 3.3V
in Pin2, CN1
(Switch Unit) (Switch Unit)
OK
*Check
Pin 1 Voltage Level
in CN1 (switch unit)
OK
Change B-board
NG NG
Change Wire Harness
And connect properly
**Check 3.3V in in
NG (Pin 8, CN9702 on
BE board) or (Pin
27, CN9700 in BA 27 CN9700 in BA
board)
OK
NG
Change Switch Unit
NG
*VOLTAGE LEVEL FOR EACH PRESSED BUTTON
KEY Voltage (average)
-
0.000
+
1.114
CH/Input
1.693
No Input No Input
2.420 2 420
**see the following slide for probing point at BA board and BE
board to check 3.3V, and probing point at switch unit
Voltage range
0.00 – 0.2
1.00 – 1.22
1.53 – 1.86
2.3 2 3 – 2 54 2.54
116
SYS SET