09/03
2-693
DC 3535/2240/1632, WC M24
121-350
Status Indicator RAPs
Initial issue
121-350 Foreign Interface Logic Fail
Due to an error during the software processing, the subsequent processes cannot be per-
formed.
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 1 121-350 RAP Circuit Diagram
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