TM 55-1930-209-14&P-11
4-8.2 Test
a.
If video monitor is inoperative, move main power switch to ON (Figure 1-3). Check input voltage from main
processor. If input voltage reading is not between 25 and 28 Vdc go to step b to check main processor and
cable. If reading is between 25 and 28 Vdc, go to step c to check video monitor.
b.
Check main processor output voltage to video monitor. If output voltage reading is not between 25 and 28 Vdc,
check main processor as given In paragraph 4-6. If output voltage reading is between 25 and 28 Vdc, check
cable connections and continuity. Tighten cable connection or repair or replace bad cable between main
processor and video monitor.
c.
Check video monitor output voltage to keyboard. If output voltage reading is not 25 to 28 Vdc, replace fuse if
bad as given in paragraph 4-8.3 or replace process and display board In main processor as given in paragraph 4-
6.3. If after repair, video monitor does not operate, troubleshoot as given in Section IX in the PMS II
Maintenance Manual If after troubleshooting video monitor still does not operate normally, replace video monitor
as given in paragraph 4-6.4.
4-8.3 Repair. Repair Involves replacement of fuses
NOTE
Some video monitors have both a 1 A fuse on the back cover and a 3A fuse inside, while
others have only a 3A fuse inside the back cover.
a.
Unsecure video monitor from mounting bracket by removing two screws from each side of monitor.
b.
Disconnect cables on back of monitor and remove monitor
c.
Unscrew 1A fuse on back of monitor and replace. If required, remove back cover, use fuse puller to remove 3A
fuse, replace fuse and back cover
d.
Connect cables to video monitor and reattach to mounting-bracket.
4-8.4 Replacement
a.
Removal
(1)
Unsecure video monitor from mounting bracket by removing two screws from each side of monitor
(2)
Disconnect cables (C1 and 13P13H) on back of monitor and remove monitor.
b.
Installation
(1)
Connect cables (C1 and 13P13H) to back of video monitor.
(2)
Secure video monitor to each side of mounting bracket with two screws
4-8.5 Video board adjustment. Adjust video board as given In Section 9, paragraph 1.0 in PMS II Maintenance Manual
in Appendix B
4-9 Alarm relay module
WARNING
Make sure main power switch (Figure 1-3) Is in OFF position and circuit breaker 4P14 or 24
Vdc power panel is open (OFF) when performing maintenance. Redtag switch with:
"WARNING DO NOT ACTIVATE. REPAIRS BEING MADE."
4-7
