TM 11-5841-287-30
Table 3-2. Encoder and Data Link Control Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5 Set UKM-4 POWER switch to OFF Disconnect 2P4 from 2FL1-J1 Connect ohmmeter(X1 scale) between 2P4 pm 8 and chassis ground
(a) Ohmmeter reads less than 100 ohms Go to step 4
(b) Ohmmeter reads open or high resistance Remove 2FL1 (para 3-16) Use figure 3-6 to isolate faulty component Repair or replace as
necessary
2.
ENCODER OPERATES WITH DATA LINK CONTROL POWER SWITCH OFF
Step 1 Set UKM-4 POWER switch to OFF Remove circuit board 2A16(para 3-11) Set UKM-4 POWER switch to ON
(a) Encoder no longer operates with data link control POWER switch at OFF Test circuit card 2A16 (para 3-36)
(b) Encoder stall operates with data Ink control POWER switch set to OFF Set UKM-4 POWER switch to OFF Disconnect connector 2P4 from
2FL1 -J1 (para 3-16) Go to step 2
Step 2 With ohmmeter set on X 100 scale, measure resistance between 2E1A ( gnd) and 2K1 -X2
(a) Resistance more than 500 ohms Replace relay 2K1(fig 3-2)
(b) Resistance less than 500 ohms Use the point-to point wiring diagram below and with ohmmeter isolate faulty component or wiring Repair
or replace faulty component or wiring as necessary
3-4
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