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4. TROUBLE SHOOTING
START
Does sine wave
appear
at R215, R216 ?
Yes
SPK_SEL signal is
low?
Yes
Check the contact
State of receiver. Is it
OK?
No Trouble
Set audio part at test equipment
as PRBS or continuous w ave, not echo.
Set the audio volume max.
No
No
No
ABB is out of order.
Change the board.
Check the soldering state of
U203 and R217. Is it OK?
Yes
DBB is out of
order.
Change the board.
Replace t he
receiver
- 62 -
No
Resolder the U203
and R217.
Otherwise change it.
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