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4.8.1. Receiver Trouble
Does sine wave appear
SPK_EN signal is low?
Connection between
FPCB and CN701 is OK?
cable and board is OK?
START
at R219, R222?
Yes
Yes
Yes
Soldering between
Yes
Cables of receiver
are OK?
Yes
No Trouble
Set audio part at test equipment as PRBS
or continuous wave, not echo. Set the
audio volume max.
No
ABB is out of order.
Change the board.
No
Resolder the U203.
Otherwise change it.
No
Reconnect FPCB
No
Resolder the cable
No
Change the receiver
-59-
to CN701
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