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TM 55-1905-223-24-18-2
3-128. Replace/Repair Central Processing Unit.
This task covers:
a. Removal
b.
Repair
c.
Replacement
INITIAL SETUP
Tools
Equipment Condition
Tool kit, electrician's,
Electrical power to machinery plant
5180-391-1087
monitoring and alarm system secured
and tagged "Out of Service - Do Not
Materials/Parts
Operate."
(TM 55-1905-223-24-10)
Data entry keyboard P/N 03-09505-000
Printed circuit board (Z-8)
P/N 05-10301-000
Printed circuit board (master card)
P/N 05-09502-000
Printed circuit board (multi-card)
P/N 05-09503-000
Printed circuit board (power supply)
P/N 05-09504-100
Warning tags, Item 1, Appendix C
REMOVAL
a. Open door (1, Figure 3-115) of enclosure (3).
b. Tag and disconnect electrical leads to central processing unit (CPU) at connections (4).
c.
Remove four hex head bolts (2) securing CPU (5) and enclosure (3) to bulkhead.
d. Remove CPU and enclosure.
e. Remove screws (1, Figure 3-116) and sleeves (2) securing crossbar (3) to
terminal board (10). Remove crossbar (3).
f.
Grasp printed circuit board (multi-card) (5) near the bottom and pull
slightly upward until board is free of connector (4).
g. Slide circuit board straight out until free of upper retaining slide (6).
h. Repeat steps e. through g. for printed circuit boards (7, 12, Z-8), (8, 13,
master card), (9, 14, power supply), and (11, multi-card).
i.
Tag and disconnect electrical leads at terminal strip (15).


 


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