Switch Unit Buttons – Troubleshooting Flow - Sony KLV-24R402A Service Manual

Troubleshooting
3-11. Switch Unit Buttons – Troubleshooting flow
Switch Unit NOT FUNCTIONING
Check Wire Harness
And Connector
Pin 1 Voltage Level
Change BB Board
NG
Connectivity?
OK
Check 3.3V
NG
Check 3.3V in Pin 1,
in Pin2, CN1 in Pin2, CN1
(Switch Unit)
OK
*Check
NG
Change Switch Unit
in CN1
OK
NG
*VOLTAGE LEVEL FOR EACH PRESSED BUTTON
Change Wire Harness
And connect properly
CN5000 on
BB Board
OK
R402/ R407/ R422/ R435/ R452/ R457/ R472/ R488
KEY Voltage Voltage range
(average) (average)
-
0.00000 – 0.82353
0.000
+
1.114 0.83451 – 1.37255
CH/Input
1.383529 – 2.03137
1.693
No Input
2.420 2.04235 – 2.80000
ITC2 CHASSIS
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