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4. TROUBLE SHOOTING
4.8.1 Receiver Trouble
Checking Flow
Does sine wave appear
SPK_EN signal is low?
Connection between
FPCB and CN501 is OK?
Soldering between
cable and board is OK?
Cables of receiver
START
at R206, R210?
Yes
Yes
Yes
Yes
are OK?
Yes
No Trouble
- 56 -
Set audio part at test equipment as PRBS
or continuous wave, not echo. Set the audi
o volume max.
No
ABB is out of order.
Change the board.
No
Resolder the U202.
Otherwise change it.
No
Reconnect FPCB
to CN501
No
Resolder the cable
No
Change the receiver
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