TM 55-1930-209-14&P-11
4-7.3.2 Printed circuit board replacement
CAUTION
When removing front of keyboard, use care not to damage keyboard circuit board and
connecting cables.
a.
Remove front plate by loosening four screws on front of keyboard.
b.
Remove cover protecting keyboard Inner circuitry by removing six nuts holding cover in place.
c.
Replace keyboard circuit.
d.
Replace inner circuitry cover and front plate.
4-7.3.3 Keyboard key lights replacement
CAUTION
When removing front of keyboard, use care not to damage keyboard circuit board and
connecting cables.
a.
Remove cap from key containing burned out lamp.
b.
Lift bulb hold-down plate to release lamp(s)
c.
Replace lamp(s) and key cap
4-7.4 Replacement
a.
Removal
(1) Disconnect cable (C2) to main processor.
(2) Disconnect cable (13P13J) to alarm relay module
(3) Disconnect cable (13P13H) to video monitor.
(4) Remove mounting hardware and carefully remove keyboard
b.
Installation
(1)
Install keyboard in reverse order of installation in step a. See also Section I in PMS II 6050D Installation
Manual in Appendix B for additional installation information
(2)
Operate monitoring system and check keyboard for normal operation. If keyboard does not operate
normally, troubleshoot as given in Section IX In PMS II Maintenance Manual in Appendix B.
4-8 Video monitor
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."
4-8.1 Cleaning and inspection
a.
Wipe clean exterior of main processor with clean rag. Open back and vacuum clean.
b.
Visually inspect for indications of burns, corrosion, loose connections, damaged parts, or chipped paint. Clean
corrosion and tighten loose connections Touch up paint according to TB 43-0144. Do not paint threads and
labels.
4-6
