Chart 7-1. Troubleshooting Chart - Continued

TM 5-6350-262-14/5

NAVELEX 0967-LP-466-9052

TO 31S9-4-38-1 Chg 2

Chart 7-1. Troubleshooting Chart--Continued

Step

Procedure

Symptom

Probable Trouble

Corrective Action

12c

a. Meter indicates 0 V dc.

a. Defective operating mode switch

a. Replace switch.

S3.

12d

a. Meter still indicates less than 1 V

a. Defective operating mode switch

a. Replace switch.

dc after expiration of entrance time

S3.

delay.

13a

a. Meter indicates less than infinite

a. Defective transmitter resync switch

a. Replace switch.

resistance.

S2.

13b

a. Meter indicates more than 1 ohm.

a. Defective transmitter resync switch

a. Replace switch

S2.

(8)

All attaching and mounting hardware for

b. The information in this section supplements that in

rightness.

section III (troubleshooting) and provides instructions for

correcting malfunctions detected during visual inspection and

b. Cleaning. Use a mild solution of warm water and

performance testing, and for adjusting the entrance and exit

liquid soap to clean exterior surfaces. After cleaning rinse

time delay functions.

parts with cold water to remove any soap solution and dry

thoroughly. Use a soft camel's-hair brush or vacuum cleaner

c. Repair of the control unit will normally consist of on-

with suitable attachment to remove accumulated dust from

site replacement of defective components and modular

components within the control unit enclosure.

assemblies in order to get the J-SIIDS back into service as

quickly as possible. Paragraphs 7-9 through 7-21 provide

c. Repair Precautions.

Use standard maintenance

removal and replacement procedures for those items requiring

practices and observe the following precautions:

instructions in addition to the disassembly sequence shown in

(1) Use exact replacement parts. A part with the

the equipment exploded view (fig. C-1). Figures 7-1 and 7-2

same electrical value or function but different physical size

show the component interconnecting wiring.

may cause trouble.

NOTE

(2) Soldering irons of less than 50 watts should

Whenever a repair procedure requires

be used to solder this equipment. Overheating of some parts

turning off the control unit power,

may cause damage.

Audible Alarm BZ204( )/FSS-9(V) must

7-9. AC Power Lamp Bulb Replacement

first be disabled to prevent sounding an

a. Unscrew and remove white lens.

alarm.

b. Push in and turn bulb 1/8 turn counterclockwise.

7-8. General Maintenance Instructions

Remove bulb.

a. In-Process Inspection. During repair, inspect control

c. Install new bulb.

unit after removal of parts for defects not visible when the unit

d. Install white lens.

is assembled. Continue the inspection during assembly to

7-10. Status Processor PWB Assembly Replacement

insure that parts are properly assembled and that the unit will

meet performance standards. During the repair process,

a. Removal. Status processor printed wiring board

inspect the control unit for the following:

assemblies Al through All (25, 26, 27, 28, 29, and 31, fig. C-

1) are easily removed by lifting up the inboard end of the

(1) Components for cleanliness.

ejector mechanism with the index finger and using it as a lever

(2) Painted surfaces for deterioration or

to lift the board out of the receptacle. Considerable force may

scratches.

be required to disengage the tight connection between board

(3) Screws for damage or corroded threads.

and receptacle. Printed wiring board assembly A12 (30)

(4) Nuts and screw holes to insure they are not

simply plugs onto the All assembly (31).

stripped.

b. Installation. Each printed wiring board assembly (Al

(5) Components for breaks, chips, or cracks.

through All) is identified by the number appearing in the

(6) Moving parts for wear.

corner opposite the ejector mechanism.

Corresponding

numbers appear across the bottom of the status processor

(7) Electrical wiring for fraying or other damage.

chassis to provide proper location of printed

Change 2 7-6