Centronics 101AL Technical Manual page 76

CARRIAGE MECHANISM
Carriage (HA-9)
1.
6.
With carriage at mid position, remove main driving belt
(See next para. C.).
Remove complete damper unit by removing screws (HD-29).
Remove bracket (HA-50) by removing screws (HA-55).
Loosen head lock knob (HA-33) and slide head back from platen
to clear guide roller (HI-111) by turning head adjusting
knob (HA-32). Release ribbon from ribbon guide roller (HA-5).
CAUTION!
AT THIS POINT, BE CAREFUL NOT TO DAMAGE
LEFT REED SWITCH AND CASE (HE-78) WHEN
CARRIAGE IS REMOVED FROM LEFT SIDE OF
MACHINE.
Move carriage to left and remove it from guide bar and guide
plate.
To install carriage, reverse above procedure.
Main Driving Belt (HA-36)
To remove belt, perform the following steps:
1. Loosen nut (HC-12) and screw (HC-11) on spring drum (HC-1).
a. Release main spring (part of HC-1) tension by intermittently
pivoting pawl (HC-10) to slowly unwind internal spring.
(Note that spring may suddenly unwind with considerable
noise, a normal occurrence).
Remove nuts, washers (HA-64, 63, 62) on shaft (A) (HA-59)
(IT IS NOT NECESSARY TO REMOVE SCREWS, WASHERS (HA-41, 43) AND
HOLDER (A) (HA-58) ATTACHED TO UNDERSIDE OF CARRIAGE EXCEPT
FOR NEW ASSEMBLY PARTS INSTALLATION. )
Remove left nut (HA-44) from screw (HA-43) with a 10 millimeter
(0.4-in.) open-end wrench.
Using two 10 millimeter open-end wrenches, remove remaining
two nuts from screw (HA-43). Belt will separate.
Remove left end of belt to the right by feeding through left
hole in base of printer chassis frame.
Continue to pull entire belt to the right feeding it through
hole on right side of printer chassis and out.
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