TM 55-1930-209-14&P-11
Table 4-1. Troubleshooting Procedures (continued)
Problem
Possible Cause
Suggested Action
c.
Bilge alarm module, horn
c.
Test and repair or replace bilge
or strobe light
alarm module (paragraph 4-10),
malfunctioning
horn (paragraph 4-12) or strobe
light (paragraph 4-13)
7.
Random symbols
Either 2A fuse(s) and/or
Replace fuse(s) (paragraph
appear on screen
fuse inside main processor
4-6.3.1)
door panel blown
8.
EMS continues to
Unknown causes beyond
Notify IDS/IGS maintenance
malfunction
unit level of maintenance
support unit to troubleshoot
(Section IX in PMS II Main-
tenance Manual in Appendix B)
4-5 General
a.
Preventive maintenance requirements are in paragraph 4-3.
b.
Maintenance beyond that required in this section must be referred to IDS/IGS maintenance unit. That unit
provides skilled electronic technicians to accomplish required maintenance according to manufacturer's manual
in Appendix B, their knowledge of Electronic microprocessors and sensors and, if necessary, additional guidance
from manufacturer's technical representative (tech rep).
WARNING
Turn off electrical power before performing any maintenance. Redtag appropriate switches
and circuit: breakers with: "WARNING DO NOT ACTIVATE. REPAIRS BEING MA[)E." Observe
safety precautions listed in this manual and those in manufacturers' Instructions/manuals.
4-6 Main processor
WARNING
Make sure main power switch (Figure 1-3) is in OFF position when performing maintenance.
Redtag switch with: "WARNING DO NOT ACTIVATE. REPAIRS BEING MADE."
4-6.1 Cleaning and inspection
a.
Wipe clean exterior of main processor with clean rag. Open door and vacuum clean or clean inside with
electrician's brush. Avoid using unauthorized solvents for cleaning inside of main processor. Solvents leave a
greasy film on components that may reduce electrical conductivity.
b.
Visually inspect for indications of burns, corrosion, loose connections, damaged parts, or chipped paint. Clean
corrosion from contacts and terminals, tighten loose connections, and replace damaged parts. Remove
corrosion with silver polish, fine sandpaper, or burnishing tool. Do not use emery paper or emery cloth or steel
wool. Vacuum to remove residue. Touch up paint according to TB 43-144. Do not paint threads or labels.
4-3
