REPLACE STRAIN-SENSITIVE CABLE FENCE SENSOR PROCESSOR PWA.

TM 5-6350-275-24&P

3-125. REPLACE STRAIN-SENSITIVE CABLE FENCE SENSOR PROCESSOR PWA.

This task consists of:

a. Remove

b. Install

INITIAL SETUP:

Tools:

General Safety Instructions:

Screwdriver, Cross tip (Item 5, App B)

Remove all jewelry while working on

Screwdriver, Flat tip (Item 7, App B)

equipment.

Open End Wrench Set (Item 13, App B)

Wear ESD wrist strap while handling ESD

Materials/Parts:

sensitive assemblies.

Strain-Sensitive Cable Fence Sensor

Processor PWA

WARNING

Shut off power source before attempting to disconnect, service, or connect wires or cables.

Failure to do so may result in serious injury or death.

a. Removal

(1) Open enclosure door (11) by loosening six screw down fasteners (12).

(2) Remove input power stepdown transformer (7) from power source and TB2 (13) pins 9 and 10. Remove 12 volt

battery (8) if connected.

(3) Remove two tamper switch wires (1) from PWA (2) connector pins A and B.

(4) Tag and remove wiring from TB1 (10) and TB2 (13) on PWA.

(5) Remove coaxial cables (5 and 6) from cable inputs 1 and 2.

(6) Remove six phillips head screws (4) and lock washers (3) from PWA (2).

(7) Remove PWA (2) and place in ESD protective bag.

b. Installation

(1) Align PWA (2) with standoffs and secure with six phillips head screws (4) and lockwashers (3).

(2) Connect coaxial cables (5 and 6) to cable inputs 1 and 2.

(3) Connect tagged wires to TB1 and TB2 on PWA.

(4) Connect two tamper switch wires (1) to PWA (2) connector pins A and B.

(5) Connect 20 vac stepdown transformer (7) and 12 volt battery (8) if used.

(6) Close enclosure door (11) and secure with six screw down fasteners (12).

(7) Set sensitive adjustment. Ref. (SAIG, Appendix E, Section 12).

3-229