Table 5-2. Control-interface Unit Troubleshooting - Continued

TM 11-6625-2937-13

Table 5-2. Control-Interface Unit Troubleshooting--Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

13.

TEST NUMBER INDICATOR DOES NOT INDICATE PROPERLY (SOME SEGMENTS DARK, ETC.).

Check circuit card assembly A1 (para 5-29e).

Replace circuit card assembly Al (para 5-15).

14.

POWER ON INDICATOR LAMPS DSI LIGHTS, MODE/POWER INDICATOR LAMPS DO NOT LIGHT, AND

TEST NUMBER INDICATOR IS COMPLETELY DARK.

Step 1. Check + 5 V output of power supply AIPSI as follows:

(a) Plug STE extender card into connector AR position.

(b) Check for +5.0O0.I V between pin 43 (+) and pin 44 (-) on extender card.

(d) If voltage is out of adjustment, adjust AIPSI (para 5-10).

(e) If voltage is missing check power supply terminals 3 (+) and 4 (-) for +5.0:0.l V. Replace defective power

supply (para 5-I8a).

Step 2. Check MODE/POWER indicator lamps and TEST NUMBER indicator for defective wiring (fig. FO-2,

and table 5-4). Replace defective wiring.

15.

TEST ADAPTER FAILURE.

Step 1 If you suspect one or more of the test adapters is not functioning properly, perform continuity tests using

the schematics in figure FO-4.

Step 2. Non-repairable items. Replace with good adapter.

5-6