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Rack
Maunting
Clip
Track Mark 100
on Carriage
aligned on Rack
Registration Ledge
on Carriage
Rack to
Carriage
Flush
within
:!:
0.00)"
Registration Surface
on Detent Rack
Maunting Screw
~
Figure 4-5. Detect Rack Removal and Replacement
4. 7. 4 Detent Rack Adjustment
NOTE: Adjustment of the detent rack is accomplished
during replacement only. The rack should never be
loosened or readjusted after it is initially installed on
the carriage.
When a detent rack is replaced (section 4.7.3), the
calibrated mark for track 100 on the carriage is
aligned with the corresponding mark on the rack.
The top registration surfaces of detent rack must be
pressed to establish a flush contact With the regis-
tration ledge of carriage. The mounting screw and
clip must be tightened to secure the detent rack
alignment.
4.8 HEAD LOAD ASSEMBLY
4. 8. 1 Head Load Solenoid Removal and Replacement
1.
Turn off all ac and dc power to machine.
4.12
2.
Remove solenoid leads from terminal strip TB4
(pins 7 and 8).
3.
Remove pivot pin from solenoid plunger.
4.
Remove two binding head screws securing
solenoid to mounting bracket.
5.
Slide solenoid horizontally away from bracket to
effect removal.
6.
Replace the head load solenoid by reversing
steps 1 through 5. Readjust head load assembly
(section 4.8.2).
4.8.2 Head Load Assembly Adjustment (Figure 4-6)*
WARNING:
Do
not load heads when disk is not rotat-
ing in machine. When cartridge is out of machine,
insert an IBM card between heads prior to loading.
Failure to comply will result in damage to heads and/
or disk.
1.
Remove CPU signal cable from plug connection
on machine.
2.
Install a CE cartridge in machine.
3.
Power up the machine and check for loading of
heads.
NOTE: Read/Write heads should load after a 90-
second delay.
If
heads fail to load, use the following
procedure to accomplish head loading:
a.
Observe that solenoid plunger has bottomed
out.
b.
Shut off power to machine.
c.
Loosen the two binding head screws that
secure the head load solenoid to the mounting
bracket.
d.
Use the solenoid adjust screw (0. 031-inch
per turn) to move the solenoid forward or
backwards in the bracket.
If
solenoid plunger
has bottomed out, move the solenoid back-
wards approximately 0.031 inch.
If
solenoid
has not bottomed out, move solenoid forward
approximately 0.031 inch.
e.
Tighten the two mounting -screws to secure the
adjustment.
4.
Use masking tape to hold the heads loaded switch
in the transferred position. Loosen the switch
mounting screws and slide the switch backwards
toward the solenoid as far as possible.
*Alternate procedures are contained in Chapter 7 for machines with
serial numbers 00001 through 00050.
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Table of Contents
Troubleshooting
