Disk Drive Assembly; Control Module - Radio Shack TRS-80 Service Manual

4. If the cable assembly requires replacement, feed the con-
nector through the opening in the keyboard base, then in-
stall a tiewrap around the cable just before the insulation
sleeve. This serves as a strain relief for the cable when the
keyboard is reassembled. Ensure that this t',ewrap is in the
recess between the opening in the case and the clamping
bosses on the bottom of the case.
5. Also ensure that on reassembly the PCB is properly posi-
tioned on the bosses of the base before attaching the top
cover.
•
MOUNTING
SCREWS
o
0
BOTTOM PAN
o
DISK DRIVE
SU BAS SEMBLY
Figure 3·2, Keyboard Cable Strain Relief
3,9 DISK DRIVE ASSEMBLY
The disk drive assembly contains two floppy disk drives. it must
be removed as a subassembly to the main metal chassis before
the mounting screws for the drives themselves are accessible.
1. There are seven mounting screws which attach this
subassembly to the main metal chassis, all of which are
accessible from the right side of the unit. Four of these are
located at the top of the assembly. Two screws are located
under the disk drive assembly at the front, but accessible
with a long shank screwdriver from the right side. A
sev-
enth screw mounts a tab to the metal chassis at the rear of
the assembly.
2. After this subassembly is removed from the unit, screws
which mount the drives in the housing are accessible.
There are two screws at the top and one at the bottom.
NOTE:
Do not place a screw in the bottom rear mounting hole
when reinstalling the disk drives into the metai housing. in-
stallation of this screw can cause possible flexing of the
drive and alignment problems.
15
Figure 3·3, Disk Drive Assembly
RH
Side View
3,10 CONTROL MODULE
The control module is attached to the left front of the metal
chassis with two screws. Remove component parts as noted in
Paragraphs 3.1, 3.2, and 3.3 to allow access to the control
module.
1. The module contains the unit power switch, reset switch,
and brightness/contrast controls for the CRT display. All
wiring to the control module is the plug-in kind attached to
terminals or connectors from the rear of the module.
2. If the module is to be removed, tag all wiring so that proper
reassembly is assured.