Head Load Assembly Adjustment - IBM 2310 Maintenance Manual

Registration Surfaces Mounting
on Detent Rack Screws (2)
Figure 7-4. Detect Rack, Removal and Replacement
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 7.8.2).
7.8.2 Head Load Assembly Adjustment (Figure 7-5)
WARNING: Do not load heads when disk is not
rotating 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 follow-
ing procedure to accomplish head loading:
227 -5984 (9/65)
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 backwards approximately
O.
031-inch. If solenoid has not bottomed
out, move solenoid forward approximately
O.
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.
WARNING:
If
the Hcads Loaded switch is not
held in transferred position,
'18
vdc will be
applied to solenoid coil resulting in damage to
equipment.
7.7