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5.6.4
HEAD AND CARRIAGE ASSEMBLY
To remove and reinstall the head and carriage assembly, use the following procedure:
A.
Close door and remove motor cover plate (item 54) by carefully peeling it off from
the motor body.
B.
Remove stepper motor lead screw per paragraph 5.6.3. For
replacement of head and carriage assembly it is not necessary
to remove motor body.
C.
Loosen screws (item 79). Move guideshaft towards the front of the
drive to free head cable from underneath the guide shaft. Cut
tie end to free cable from frame.
D.
Move carriage up and away from the guide rod and gently remove
the head assembly.
E.
To reinstall, reverse above procedure. Be careful to ensure that
there is enough slack in the head cable to allow carriage to go to
track
00
and the cable is routed properly.
F.
Align head to correct track position by using alignment disk. Head
assembly will be approximately in alignment if stepper motor body
is not removed.
G.
Readjust track
00/39
stop if necessary (see paragraph 5.8.5).
H.
Replace motor cover plate (item 54), if damaged, use new part.
5.6.5
READ/WRITE HEAD LOAD PAD
This assembly could be easily replaced by merely compressing the slot while pushing it out. To
install merely push the assembly, and it will snap into place.
Using alignment disk, display the
signal at track
00
on the oscilloscope, turn the pad assembly using screw driver in the slot until max-
imum signal is achieved. If unit exhibits head flying phenomenon, check head load force (14± 2
grams). If head load force is not proper change spring, Arm Return (P/N 630276).
5.6.6
SPI NDLE HUB AND PULLEY ASSEMBLY.
This assembly requires dial indicators and surface plate, so they are not recommended for field
replacement.
5-6
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