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WARNING: Do not force the magnet to slide out of
the mounting bracket since damage to drive coil,
mounting base, and magnet mounting spacers would
result. With a moderate force, the magnet will slide
smoothly out of the mounting bracket. Do not drop
or hammer on the magnet since this could destroy the
epoxy joints binding the face plates to the permanent
magnet. When the magnet is out of the machine,
place masking tape over the flux gap to prevent
particle accumulation. When replacing the magnet,
be certain that mounting spacers are seated in their
respective counterbore recesses.
4.
Slide magnet horizontally away from carriage.
5.
Replace drive magnet by reversing steps 2
and 3.
If
a new magnet is installed, perform
the drive magnet adjustment described in
Section 7.6.2.
7. 6. 2 Drive Magnet Adjustment
Adjustment of the drive magnet (Figure 7-2) is
to
be accomplished whenever a new drive magnet is
installed. This adjustment prevents binding which
could cause distortion of the base and result in mis-
alignment of the carriage.
The threaded sleeve located outboard on the
actuator mounting bracket must be positioned to
provide a O. 0005-inch clearance with the drive mag-
net spacer which is located inboard on the mounting
bracket.
1.
Remove the mounting screw, and loosen the
locknut which secures the sleeve against the
spacer.
2.
Use a feeler gage
to obtain the 0.0005-inch
clearance between the spacer and sleeve.
3.
Tighten the locknut after the O. 0005-inch clear-
ance is obtained and replace the mounting screw.
7.7 DETENT ASSEMBLY AND DETENT RACK
7. 7. 1 Detent Assembly Removal and Replacement
1.
Disconnect detent coil leads from terminal strip.
Mark the pin location of each lead prior to re-
moval to facilitate identification.
2.
Remove three socket-head mounting screws
securing detent assembly to carriage mounting
base.
3.
Remove detent assembly by lifting it upward
away from carriage assembly.
7.4
4.
Replace detent assembly by reversing steps 1,
2, and 3. Insert mounting screws, but do not
tighten at this time. Adjust detent assembly
(refer to section 7. 7.2).
7.7.2 Detent Assembly Adjustment (Figure 7-3)
WARNING: The only two CE adjustments required
for the detent assembly are the pawl-to-rack align-
ment and the electromagnet air-gap alignment
spacing. Do not, under any circumstances, loosen
bolts holding the springs, spring post, spring mount,
or electro-magnet.
1.
Turn off all power to the machine.
2.
Loosen three socket-head cap screws securing
detent assembly
to actuator assembly. Loosen
screws until detent assembly will slide, with-
out rocking, toward and away from detent rack.
3.
Push registration ledge of detent assembly
against the corresponding edge of carriage
mounting base (Figure 7-3). Slide detent
assembly along this edge until a gap of 0.007
(±O. 003) inch is formed between either the odd
or even pawl and a detent crown tooth of the
detent rack.
(If
necessary, move carriage to
align a crown tooth of detent rack with a pawl. )
Tighten the three socket head mounting screws
to secure this adjustment.
4.
Check adjustment made in step 3. Repeat
step 3 if necessary.
5.
Remove CPU signal cable from processor so
that C E switches can be used to control
accessing.
6.
Turn on power to machine and insert CE disk
cartridge.
WARNING: The CE disk cartridge must be inserted
before continuing with the procedure.
7.
Upon completion of step 6, one detent coil is
energized. Give carriage a slight push
to
ensure full engagement between rack and detent
pawl.
8.
Loosen
#
0-80 nut (Figure 7-3) on the energized
detent coil using a 3/16-inch End Wrench.
9.
Use a fine blade screwdriver to turn the knurled
(serrated) portion of the gap-adjuster nut
(Figure 7-3) until an air gap between the clapper
and pole pieces is within O. 004
(+
O. 001, -0. 002)
inch width. Use non-magnet shims to check
this air gap measurement. Do not apply exces-
sive force on the adjustment because too much
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Table of Contents
Troubleshooting
