Table 4-2. Unit Troubleshooting-continued -706880259

TM 5-4210-233-14&P-1

4-2. Unit Troubleshooting-Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ELECTRICAL SYSTEM - AERIAL CONTROL PANEL - Continued

2 TURNTABLE SWIVEL ASSEMBLY SLIP RING CONTACT INTERRUPTED

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 0 of 16.)

Step 1. Disconnect +12V supply wire for malfunctioning item at terminal strip located under turntable and

attach one lead of continuity tester to wire leading to slip ring.

Step 2. Attach other lead of continuity tester to corresponding terminal on terminal strip at aerial console.

Step 3. Rotate turntable while checking for continuity.

If continuity is interrupted while rotating turntable, replace swivel assembly.

Notify Direct Support

If continuity is not interrupted while rotating turntable, see the appropriate troubleshooting

procedure for the malfunctioning circuit. (Fault does not exist in swivel assembly).

3 AERIAL PANEL LIGHT WILL NOT ILLUMINATE WITH AERIAL MASTER ON

(Refer to Electrical Wiring Diagrams, Appendix H, Sheets 3 and 11 of 16.)

Step 1. Check bulb.

Replace bulb (see para 4-9.4).

Step 2. Check switch.

Replace switch (see para 4-179).

Step 3. Confirm that turntable step lights illuminate.

If step lights illuminate go on to Step 4 .

If step lights do not illuminate, refer to "swivel assembly slip ring contact interrupted"

troubleshooting procedure.

Step 4. Check wiring from terminal block to light for continuity.

Replace wire (see para 4-9.4).

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