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Page Title:
Table 5-2. Control interface Unit Troubleshooting |
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 TM 11-6625-2937-13
Table 5-1. Control-Interface Unit Functional Test
Control setting
Step
Test
Equipment
no.
equipment
under test
Test procedure
Performance standard
13
Digital tester
None
Adjust oscilloscope controls so that wave- Signals on channel A and B are
RECYCLE TEST:
forms displayed clearly show displacement similar to B, figure 5-2. Displace-
between signals monitored.
ment is less than 100 ns.
14
Oscilloscope
POWER: OFF
Remove oscilloscope leads from
None.
POWER: OFF
MODULE TEST connector.
Digital tester
POWER: Down (dl)
UUT POWER:
Down (off)
Table 5-2. Control interface Unit Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
POWER CIRCUIT BREAKER CBI DOES NOT HOLD WlTH POWER SWITCH S1 ON.
Step 1. Remove ac power and check that power supply AIPSI inputs I and 2 (NEUT) are not shorted to each other or to ground ( FO-2).
Replace defective power supply AIPSI (para 5-13a).
Step 2. Check that power supply AIPS2 inputs I and 2 (NEIT) are not shorted to each other or to ground (f4 P2).
Replace defective power supply AIPS2 (pare 5-19a).
Step 3. Chock that power supply AIPS3 inputs I and 2 (NEUI) are not shoed to each other or to ground- (fig FO-2).
Replace defective power supply AIPS3 p 5-20a).
Step 4. Check that POWER switch S1inputs (5,8 and 11) and outputs (6,9 and 12) are not shorted to each other
or to ground (f 2).
Replace defective POWER switch SI (para 5-13b).
Step 5. Check that circuit breaker CB outputs A2, B2 and C2 are not shorted to each other or to i (fig. FO-2).
Replace defective circuit breaker CBI.
2.
POWER ON INDICATOR LAMP DSI DOES NOT UGHT.
Step 1. Check indicator lamp by replacement (para 3-14a).
Replace defective indicator lamp.
Step 2. Check for 115 V ac between pin A and pin B (NEUT) of DSI (4 FO-2).
(a) if voltage is correct, replace lamp socket.
(b) If voltage is missing, check filter assembly A1FL1, circuit wiring and power cable assembly W1. Replace
defective part or
wiring (para 5-16A, fig. FO-2, and table 5-5) or repair A1FL1 (para 5-17)
3.
ELAPSED TME METER M1 DOES NOT COUNT.
Step 1: Check for 115 V ac between A and B (NEI) of Ml ft F}2).
(a) If voltage is correct, continue to step 2
(b) If voltage is missing, check filter assembly A1FL1, circuit wiring and power cable assembly W1.
Replace defective parts or wiring (para 5-16a, fig. FO-2 end table 5-5) or repair A1FLI (pa 5-17).
Step 2. Check meter by replacement..
Replace defective meter.
4.
SHORT INDICATOR DS3 LIGHTS WITH DIGITAL TESTER UUT POWER ON.
Step 1. Check cable W2 for defective wiring (table 5-6). Replace defective cable.
Step 2. Check power fault detection circuits on circuit card assembly A1 as follows:
(a) Set control-interface unit POWER ON/OFF switch to OFF.
(b) Install circuit card assembly A1 on extender card and plug extender card into control-interface unit.
(c) Set control-interface unit POWER ON/OFF switch to ON.
(d) Place MODE SELECT switch in MODULE TEST ENC position.
(e) Using extender card test points, measure the following input voltage to circuit card assembly A1..
Test point
Voltage
A1P1-84
+5.0+0.1 V
A1P1-27
-5.0+0.1 V
A1P1-85
+ 12.0+0.1 V
(f) Place MODE SELECT switch in MODULE TEST DEC position.
(g) Using extender card test points, measure the following input voltages to circuit card assembly A1.
Test point
Voltage
A1P1-26
-15+0.1V
A1P1-86
+15.0+0.1V
(h) If voltages all check good, replace circuit card assembly A1 (para 5-15).
(i) If one or more voltage is incorrect, check control-interface unit wiring (fig. FO-2). Remove extender card and reinstall circuit card
assembly A1 )para 5-15b.)
5-4
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