TM 11-7021-202-12
1-10.
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
The processor (all versions) is comprised of the Chassis Assembly, power supply (ac or dc),
Power Unit Assembly, and front panel (part of the Motherboard Assembly). Refer to table
a. Chassis Assembly. The chassis is comprised of the mainframe, card cage, two air
ducts, and the top and bottom cover plates (fig. 1-1).
b. Power Supply. The 5617 AC Power Supply or a 5687 DC Power Supply is housed
at the rear of the processor; behind and attached to the Power Unit Assembly. The power
supplies are plug-in units. The AC Power Supply converts external primary 115V ac power
into dc voltages required for processor operation. The DC Power Supply uses externally
supplied 28V dc to create the dc voltages required for processor operation (fig. 1-1).
c. Power Unit Assembly. The Power Unit Assembly is mounted at the rear of the
processor (fig. 1-2) and attaches to the chassis; the power supply is attached to the Power
Unit Assembly. The ac version of the Power Unit Assembly is comprised of a cover, Power
Unit (electronics module), and an ac blower fan. The dc version of the unit comprises the
same components, except the electronics module is not used.
d. Front Panel Assembly. The front panel of a processor with semiconductor memory
Meter (ETM), a PWR ON/RESET indicating pushbutton switch, program RUN/RESET
indicating pushbutton switch, a BITE/BOOT indicating pushbutton switch, and a grounding
lug. A BATT indicator shows whether or not the memory power (+5V) is up.
The front panel of a processor with core memory (fig. 1-1, 1-3) similar to the front paneI of a
processor with semiconductor memory with the following exceptions:
No BATT indicator
Ground stud moved from right side of the panel to upper left
corner of the panel.
J6 is converted from an 8-pin battery back-up connector to a
55-pin connector for interfacing an external core memory
extension chassis.
Panel is thicker and has a different shape than the panel on the
q
semiconductor version (fig. 1-1 ).
Up to eight of the 11 connectors on the core memory processor front panel may be used to
connect peripheral devices to their respective I/O interfaces PCB in slots Al through A8.
The remaining three connectors are used for power input (ac or dc), connection to a system
terminal, and connection to a remote memory. Three of the fuse assemblies on the panels
are used when the processor is configured for ac power, and the remaining two are used
when the input power is dc. The ETM display indicates accumulated processor running
hours. Table 1-3 lists and describes the function of the processor's front panel connectors,
indicators, controls, and fuses (fig. 1-3).
1-7
