CHAPTER 6 REPAIR OF SIGNAL MODULE

TM 5-6350-264-14&P-11

NAVELEX EE 181-AA-OMI-120/E121 C-7359-60-1

T.O. 31S9-2FSS9-1-11

CHAPTER 6

REPAIR OF SIGNAL MODULE

6-1. REPAIR OF SIGNAL MODULE. Repair of the Signal Module is restricted to removal and replacement of the

audible signal device and the logic subassembly printed circuit board.

To remove the audible signal device, unlock and open the Monitor Cabinet door. Unlatch and swing out the

mounting rack. Tag wires, unscrew terminal screws, and disconnect wires from audible signal device.

Unscrew knurled nut and slide audible signal device from Signal Module.

To install new audible signal device, position audible signal device in Signal Module. Screw knurled nut on

signal device. Connect wires to terminals and install terminal screws. Close and latch mounting rack. Close

and lock Monitor Cabinet door.

To remove the logic subassembly printed wiring board, unlock and open the Monitor Cabinet door. Unlatch

and swing out the mounting rack. Tag and remove wires from terminal board TB1 located on back of signal

module. Remove the screws holding it in the rack and pull the module out of the rack. Place signal module

on the bench. Remove four screws and lock washers from the signal module cover and remove the signal

module cover. Tag wires and use a soldering iron of 50 watts maximum to disconnect wires from logic

subassembly PC board. Remove mounting screws and lock washers. Remove logic subassembly PC board

from Signal Module.

To install new logic subassembly PC board, position board in Signal Module and install mounting screws and

lock washers. Use a soldering iron of 50 watts maximum to solder wires to printed wiring board. Position

Signal Module cover and install screws and lock washers. Position Signal Module in mounting rack and install

mounting screws. Connect wires to terminal board TB1. Close and latch mounting rack. Close and lock

Monitor Cabinet door.

6-2. CHECKOUT PROCEDURE.

After repair, test Signal Module for proper operation.

Interrupt ac power by removing fuse F2 from Monitor Control power supply. Module lamps should be flashing

and audible signal should sound. Momentarily depress ACKNOWLEDGE switch. The lamps should be

extinguished and the audible signal should be silenced. Restore ac power by reinstalling fuse F2 in Monitor

Control Power Supply. Signal Module lamps should be flashing and audible signal should sound.

Momentarily depress ACKNOWLEDGE switch. The lamps should be on-steady and the audible signal device

should be silenced.

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