Direct Support Troubleshooting Procedures

TM 11-6760-238-34

Table 3-2. Operational Check-Continued

Step

Position of shutter test set switches

Required indication

MASTER switch: INTERNAL TESTS + 28VDC,

OPER lamp lights

POWER switch ON

OPER lamp goes out

MASTER switch INTERNAL TESTS + 19VDC,

RECY lamp lights

POWER switch ON.

RECY lamp goes out

MASTER switch INTERNAL TEST + 28VDC,

DATA lamp lights

POWER switch ON

DATA lamp goes out

MASTER switch INTERNAL TEST + 28VDC;

ELECT FLASH lamp lights

POWER switch: ON

ELECT FLASH lamp goes out

90 and AUTO lamps light

MASTER switch- CONTROL PANEL, POWER

switch ON

90 and AUTO lamps go out

MASTER switch RELAY TEST, RELAY ASSY

D lamp lights

switch position 2, POWER switch ON

Set all test panel switches to OFF or extreme

D lamp goes out.

counter- clockwise position

b. Troubleshooting Table. Steps referenced in the

malfunction column refer to the operational check

3-6. Direct Support Troubleshooting Procedures

(para 3-5).

Direct support troubleshooting procedures

(table 3-3) supplements the equipment performance

NOTE

checklist In TM 11-6760-238-12. If the symptoms are

not known, perform the preoperational test (TM 11-6760-

238-12) and observe any malfunction. Table 3-3 lists the

Perform the operation given in TM 11-6760-238-12

malfunctions, test or inspection, and corrective action.

before using this chart unless the trouble has already

Refer to figure* FO-4 for location of parts.

been localized

Table 3-3. Direct Support Troubleshooting

SYMPTOM

PROBABLE TROUBLE

CORRECTIVE ACTION

1. DC POWER LAMPS DS1, DS2 DO NOT LIGHT (step 1)

a. Defective DC POWER lamps DS1 and/or DS2, or indicator lamp assembly A3

Replace lamps or modicator lamp assembly (para 3-8t)

b. Defective 10 ampere DC fuse Fl, or fuseholder

Replace fuse or fuseholder (para 3-8p)

c. Defective POWER switch S1

Replace POWER switch (para 3-8h)

2. AC POWER LAMPS DS3, DS4 DO NOT LIGHT (step 1)

a. Defective AC POWER lamps DS3 and/or DS4 or indicator lamp assembly A3

Replace lamps or indicator lamp assembly A3 (para 3-8t).

3-4