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7-8. Receiver Part
Receiver does not work
U402 pin 3, 15 = 1.5V?
U402 pin 8, 12 = 1.5?
EAR400 pin 5, 2 = short?
HEA1 pin 24, 26 = 1.5V?
SPK +,- PAD = 1.5V?
Check the soldering of the
speaker wire
Is Receiver working?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
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No
Resolder or replace U402
No
Resolder or replace U402
No
Resolder EAR400
No
Resolder HEA1
No
Change LCD module
No
Modify the speaker wire soldering
No
Replace the Receiver
7-17
Flow Chart of Troubleshooting
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