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09/03

2-689

DC 3535/2240/1632, WC M24

121-310, 121-333

Status Indicator RAPs

Initial issue

121-310 Foreign Interface/Foreign Device Communication

Fail

Communication cannot be established between the Foreign Interface and the Foreign Device

(3rd-party device such as vend station or mechanical Auditron).

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.

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.

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 1 121-310 RAP Circuit Diagram

121-333 Foreign Interface/ESS Communication Fail

Communication cannot be established between the Foreign Interface and the ESS PWB.

Initial Actions

If an external Auditron-type device is connected to the Foreign Interface, ensure that thema-

chine’s internal Auditron is disabled.