CHAPTER 7 DIRECT SUPPORT (INTERMEDIATE) MAINTENANCE INSTRUCTIONS

TM 5-6350-262-14/11

NAVELEX 0967-LP-466-9112

TO 31S9-4-39-1

CHAPTER 7

DIRECT SUPPORT (INTERMEDIATE) MAINTENANCE INSTRUCTIONS

Section I. GENERAL

WARNING

The monitor cabinets contain rechargeable batteries which may generate ignitible

amounts of hydrogen gas if certain failures occur. This is a potential safety hazard. Do

not smoke when opening the monitor cabinet door. Allow the unit to ventilate with the

door open for two minutes before turning the POWER switch to OFF or performing any

other maintenance action. If excessive heat or fumes of any nature are being emitted

from the monitor cabinet, immediately open the enclosure door and ventilate for two

minutes before turning the POWER off. Do not smoke in the vicinity of the unit during

initial opening or during the two-minute ventilation period.

7-1.

Scope

following isolation of a J-SIIDS malfunction to the

monitor cabinet(s).

However, the performance

standards contained in section V may be used at

This chapter provides specific instructions for all

periodic intervals to check the ability of the monitor

maintenance functions authorized direct support

cabinet to perform its intended mission.

maintenance personnel by the maintenance allocation

chart (appendix B). Included is a description of controls

7-3.

Direct Support controls

used by direct support and general support maintenance

personnel, a list of test equipment required for total

maintenance, troubleshooting and repair instructions,

One two-position switch located on the power supply

and performance standards.

module inside the monitor cabinet enclosure is used by

direct support maintenance personnel in addition to the

7-2.

Purpose

operator controls (para 3-1).

The function of the

POWER switch (S ) is described in paragraph 6-3.

These maintenance instructions are primarily for use

Chart 7-1. Troubleshooting-Monitor Cabinet

Unit status Trouble symptom

Test action

Indication

Probable cause

Corrective action

a. MONITOR AC

a. 115 V ac absent.

a. Apply 115 V ac to

AC ON

MONITOR AC POWER

1. Depress the

lamps flashing on the

acknowledge switch

POWER lamps on

power supply TB1.

b. Fuse (F2) bad.

b. Replace F2.

signal module and the

(SI) at the signal

the signal module

c. Power supply defective.

c. Replace power supply.

audible alarm DSI, is

module.

turn off and the

a. Signal module defective.

sounding.

audible alarm,

DS1, stops

soundings.

b. No change.

a. +20 V dc + 1 V

a. Fuse (F1) bad.

a. Replace fuse (F1).

AC ON

Total monitor cabinet

1. Check for

b. Power supply defective.

b. Replace power supply.

failure.

regulated +20 V dc at

not present.

the power supply TB

3-2, -3, and -4 with

respect to TB3-6.

a. Signal module defective.

a. Replace signal supply.

a. +20 V dc + 1 V

AC ON

Total power failure at

1. Check for

signal module.

regulated +20 V dc at

present.

signal module

connector pin 9 with

respect to pin 10.

a. Power supply defective.

a. Replace power supply.

a. +20 V dc + 1 V

AC ON

Total power failure at

1. Check for

signal module(s) (no

regulated +20 V dc

not present.

indicator lights.)

power at monitor

module connector pin

9 with respect to pin

10.

a. Lamps do not

a. Lamps are bad.

a. Replace lamps

AC ON

One or both signal module

1. Activate signal

MONITOR AC POWER

module S1 to LAMP

light.

LAMPS off.

TEST POSITION.

a. Signal module defective.

a. Replace signal

AC ON

Signal module audible

1. Short signal

a. Audible alarm

alarm (DS1) not

module terminal board

does not sound.

module.

functioning properly.

pin 1 to pin 4.

Change 2 7-1