TM 11-7440-232-12/NAVELEX 0967-LP-275-5010
Section V. MAINTENANCE PROCEDURES
5-18. OPERATIONAL CHECK AND INSPECTION - INSTALLED ITEMS
Do PMCS. The PMCS table, Section III in this chapter, provides an operational check of the digital data modem and
inspection of installed items.
5-19. REMOVAL
a. Plug-in components listed
SHELF
NAME
SHELF
NAME
POSITION
POSITION
A1
Power Supply
A6
Limiter Discriminator
A2
Digital Data Transmitter
A7
Decoder Error Detector
A3
Transmitter Clock
A8
Digital Receiver Clock
A4
Receiver Line Filter
A9
Module Extender
A5
Adjustable Equalizer
A10
Data Carrier Alarm
A11 RF Oscillator - removal procedure different from other plug-ins.
b. REMOVAL OF PLUG-IN UNITS
EQUIPMENT CONDITIONS
Power off
Front cover open, and lowered on hinge to stop with no interference.
Clear front workspace -- enough to handle plug-ins units which are about 10 inches deep.
PROCEDURES -- except RF oscillator
NOTE
The power supply is larger and heavier than the other plug-in units and includes a metal chassis.
Nevertheless, it is securely attached to its printed circuit card and plugs in and out of the modem
shelf like all the regular plug-ins.
CAUTION
Do not use any tools. The module you will handle has an exposed printed circuit card which can
be broken easily or scratched through. Any difficulty in removal should be referred to higher
level maintenance. Provide a clear and cushioned place to set the module down after removal.
1.
Grasp with your hand, front edge of module.
2.
Pull gently forward until connector release is felt or for about 1 inch.
3.
Reposition grip and place other hand to hold back end at removal.
4.
Pull gently to complete removal.
5-50
