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Flow Chart of Troubleshooting
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7-
15
7-8. Receiver Part
U510 pin2 = L during
call established?
Ceck U510
END
No
Yes
Yes
Receiver does not work
Is Receiver working?
Replace the Receiver
No
Yes
No
Resolder or replace
U510
Yes
U510 pin 8, 12 = 1.5?