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6.
Replace drive magnet by reversing steps 1
through 5. Ensure that magnet contacts front
stop on actuator bracket before securing the
installation with mounting screws.
4.6.2 Drive Coil Removal and Replacement
1.
Turn off all ac and dc power.
2.
Remove drive magnet (refer to section 4.6.1).
3.
Unsolder'voic'e coil leads and note terminal
from which each lead is removed •.
4.
Remove three binding head mounting screws .
located inside the voice coil.
5.
Slide coil horizontally, away from carriage,
off dowel pin.
I
CAUTION: ·Ensure that correct leads are matched
to terminals on the voice coil after replacement.
Reversal of these leads would cause uncontrolled
carriage motion resulting in damage to eqUipment.
6.
Replace drive coil by reversing steps 2 through
4. Replace drive magnet (see Section 4.6.1).
4.7 DETENT ASSEMBLY AND DETENT RACK*
4.7.1 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 two nex-head mounting screws
securing detent assembly to carriage mounting
base.
3.
Remove detent assembly by lifting it upward
away from carriage assembly.
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 4.7. 2).
4.7.2 Detent Assembly Adjustment (Figure 4-4)
WARNING: The only CE adjustment required is the
fixed pawl-to-rack alignment which is established
by controlling the air gap between clapper and pole
piece of the energized detent.
Do
not, under any
circumstances, loosen screws holding the springs,
electromagnet, or pawls and pole pieces.
*Alternate procedures are contained in Chapter 7 for machines with
serial numbers 00001 through 00050.
4.10
1.
Energize one of the detents. ,
2.
Push registration ledge of detent assembly against
the corresponding edge of carriage mounting base
(Figure 4-4).
3.
Insert a
O.
006-inch, non.:..magnetic shim in the
gap between clapper and pole piece and slide
detent assembly along registration ledge until
energized detent pawl engages the rack.
4.
Ensure that the
O.
006-inch gap betWeen' clapper
and pole piece is maintained while pOSitiOning the
assembly to engage the rack. The shim should
have a sliding-fit in the gap.
5.
Repeat this procedure for the other detent by
energizing its electro-magnet and maintaining the
O.
006-inch gap between clapper and pole piece
with pawl engaged in rack.
6.
Tighten mounting screws to secure the detent
assembly. Check the air-gap dimension between
clapper and pole pieces of both detents to ensure
that a 0.006 (±0.001) inch clearance is
maintained.
7.
Insert CE disk cartridge, and remove CPU signal
cable from processor so that CE switches can be
used to control acceSSing.
WARNING: The CE disk cartridge must be inserted
before continuing with the procedure.
8.
Set the CE Step Mode switch to 10 mill i-inch
steps. Using the CE Step Control switch, move
carriage one track (0.010 inch). The other detent
pawl should now be engaged with the rack.
9.
Move carriage slightly to check for good contact
between pawl and rack engagement.
10. Set theCE Step Mode switch to 20 milli-inch
steps, and repeat steps 8 and 9 to check opera-
tion of the other detent.
11. Turn off all power to the machine.
12. Replace CPU signal cable on processor.
NOTE: The Read/Write head must be adjusted with
a CE Cartridge installed after each adjustment of the
detent assembly has been accomplished. (Refer to
section 4. 17.
1. )
4.7.3 Detent Rack Removal and Replacement*
Removal
1.
Remove detent assembly (refer to s'ection 4.7.1).
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Troubleshooting
