09/03
2-692
DC 3535/2240/1632, WC M24
121-337, 121-338
Initial issue
Status Indicator RAPs
121-337 Foreign Device Self Diag Fail
The self diagnostics result of the connected Foreign Device was an error at WAKE UP
ANSWER.
Procedure
Switch the power off, then on. The problem continues.
YN
Check for loose connections or dirty contacts between the ESS PWB and the Foreign
Interface, and between the FI and the attached device.
Replace the Foreign Device.
121-338 Foreign Interface Answer Time Out
The answer from the Foreign Interface excluding WAKE UP ANSWER cannot be received.
Procedure
CAUTION
Do not attempt to troubleshoot this circuit by jumpering the Transmit Data or Receive Data
lines (P343 pins 4 ~ 6 on the ESS PWB). This will destroy the serial port on the ESS PWB.
NOTE: Refer to Figure 1 (Circuit Diagram).
Switch the power off, then on. The problem continues.
YN
Check for loose connections or dirty contacts between the ESS PWB and the Foreign
Interface, and between the FI and the attached device.
Switch off the power. Disconnect the device from the FI. Connect a jumper from pin 1 to pin 3
on J940 on the Foreign Interface. Switch on the power. The fault code is still present.
YN
Repair or replace the Foreign Device.
Reinstall the ESS software.
If the problem continues, replace the Foreign Interface (PL 10.3)
If the problem continues, replace the ESS PWB (PL 13.1).
Figure 1 121-338 RAP Circuit Diagram
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