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Page Title:
Table 3-3. Direct Support Troubleshooting-continued |
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 TM 11-6760-238-34
Table 3-3. Direct Support Troubleshooting-Continued
SYMPTOM
PROBABLE TROUBLE
CORRECTIVE ACTION
b. Defective 1 ampere AC fuse F2 or fuseholder
Replace fuse or fuseholder (para 3-8p)
c. Defective POWER switch S1
Replace POWER switch (para 3-8h).
3.
NO + 28 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 2), DC POWER LAMPS ON
a. Defective MASTER switch S3
Refer to higher category of maintenance
b. Broken lead to VOLTMETER binding post J14 or J15
Check for broken lead; repair or replace
4.
NO + 19 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 3), DC POWER LAMPS ON
a. Defective MASTER switch S3
Refer to higher category of maintenance
b. Broken lead to VOLTMETER binding post J14 or J15
Check for broken lead, repair or replace
c. Defective shutter assembly test board and components assembly A8
Replace shutter assembly test board and component assembly A8 (para 3-8b)
5.
NO + 13 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 4), DC POWER LAMPS ON
a. Defective MASTER switch S3
Refer to higher category of maintenance
b. Broken lead to voltmeter binding post J14 or J15
Check for broken lead, repair or replace
c. Defective shutter assembly test board and components assembly A8
Replace shutter assembly test board and components assembly A8 (para 3-8b).
6.
NO + 6.8 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 5), DC POWER LAMPS ON
a. Defective MASTER switch S3
Refer to higher category of maintenance
b. Broken lead to VOLTMETER binding post J14 or J15
Check for broken lead, repair or replace
c. Defective shutter assembly test board and components assembly A8
Replace shutter assembly test board and components assembly A8 (para 3-8b).
7.
NO + 4.2 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 6), DC POWER LAMPS ON
a. Defective MASTER switch S3
Refer to higher category of maintenance.
b. Broken lead to VOLTMETER binding post J14 or J15
Check for broken lead, repair or replace
c. Defective shutter assembly test board and components assembly A8
Replace shutter assembly test board and components assembly A8(para 3-8b)
8.
NO + 6 2 VDC MEASURED AT VOLTMETER BINDING POSTS J14 AND J15 (step 7), AC POWER LAMPS ON.
a. Defective MASTER switch S3
Refer to higher category of maintenance
b. Broken lead to VOLTMETER binding post J14 or J15
c. Defective shutter assembly test board and components assembly A8
Replace shutter assembly test board and components assembly A8 (para 3-8b)
9.
WITH EXCEPTION OF AC POWER, DC POWER AND FWD, CENTER AND AFT LAMPS (DS3, DS4, DS5), PANEL LAMPS DO NOT LIGHT (step
8)
a. Defective MASTER switch S3
Refer to higher category of maintenance
b. Broken lead to MASTER switch
Check for broken lead, repair or replace
10. SENSOR CAL LAMP DS2 DOES NOT LIGHT (step 10 and 14), AC POWER AND DC POWER LAMPS ON
a. Defective SENSOR CAL lamp DS2
Replace lamp or lampholder socket (para 3-8n)
b. Defective FOCAL PLANE SHUTTER switch S8
Refer to higher category of maintenance
c. Defective FWD control RI
Replace FWD control R1 (para 3-8r)
d. Defective SENSOR switch S9
Replace SENSOR switch (para 3-8h)
e. Defective shutter assembly test board and components assembly A8
Replace shutter assembly test board and components assembly A8 (para 3-8b).
f. Defective bridge assembly A10
Replace bridge assembly A10
3-5
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