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WARNING: Caution must be exercised in handling
the tachometer core and extension rod. These
assemblies can be damaged if dropped.
5.
Remove the two set screws in the carriage
mounting base which secure the tachometer
shield.
6.
Slide tachometer shield out of carriage mounting
base and tachometer bracket.
7.
Slide tachometer coil and housing assembly out
of tachometer shield.
WARNING: Slide coil and housing assembly out the
end of tachometer shield nearest the spindle. Do
not bend tachometer electrical leads back and forth
since they can break within the coil and housing
assembly.
8.
Replace the tachometer assembly by reversing
steps 2 through 7, and adjust according to
section 4.12.2.
4.13 CARRIAGE RAIL
4.13.1 Carriage Rail Removal and Replacement
(Figure 4-2)*
1.
Turn off all ac and dc power to the machine and
remove top baseplate cover.
2.
Remove two retaining screws, one each, located
at front and rear of rail. (These screws retain
the rail in V -grooves of the carriage mounting
base. )
3.
Insert 0.100-inch feeler gage shim between the
carriage preload spring and carriage. Remove
preload force on the rail, and slide the rail out
of the carriage mounting base being careful to
avoid misalignment.
WARNING: Misalignment in this step could damage
the carriage bearings.
4.
Replace carriage rail by reversing steps 2
and 3.
4.14 CARRIAGE PRELOAD BEARING ASSEMBLY
4.14.1 Carriage Preload Bearing Assembly
Removal and Replacement
1.
Remove all ac and dc power to the machine.
*Alternate procedures are contained in Chapter 7 for machines with
serial numbers 00001 through 00050.
4. 16
2.
Remove drive magnet. (Refer to Section 4.6.1.)
3.
Remove drive coil. (Refer to Section 4.6.2.)
4.
Remove two binding head mounting screws which
secure preload bearing spring to carriage" and
remove bearing assembly.
NOTE: When replacing bearing assembly in step 4,
ensure that edge of preload bearing is fully engaged
with registration surfaces before tightening the
mounting screws.
5.
Replace carriage preload bearing assembly by
reversing steps 2 through 4.
4.15 CARRIAGE SUBASSEMBLY
4.15.1 Carriage Subassembly Removal and
Replacement*
1.
Remove all ac and dc power to machine.
2.
Remove Drive Magnet. (Section 4. 6. 1. )
3.
Loosen binding head screw securing head plug
clamp to release head plug. Disconnect head
plugs from head cables.
4.
Remove tachometer extension rod from carriage
(see section 4.12.1).
5.
Unsolder voice coil leads and note terminal from
which each lead is removed.
6.
Remove three binding head screws which secure
carriage outrigger slide to carriage. Remove
slide.
7.
Remove carriage rail (see section 4.13.1).
8.
Lift carriage assembly vertically, away from
carriage mounting base.
WARNING: Caution must be exercised to ensure that
read/write heads do not strike anything during
removal.
9.
Replace carriage subassembly by reversing
steps 2 through 7.
10. Adjust tachometer extension rod according to
section 4. 12. 2.
11. Adjust head-arm assemblies according to
section 4.17.1.
12. Perform the following adjustments if a new car-
riage subassembly has been installed:
a.
Check detent adjustment and readjust
if
necessary according to section 4.7.2.
b.
Adjust front and rear crash stops according
to section 4.10.
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Troubleshooting
