Centronics 101A Technical Manual page 98

5.2.8 PIN FEED UNIT (Figure HG)
5.2.8ul Operation
Pin feed tractors, left and right (HG-19) provide pin
guides for paper to travel vertically up or down. To move paper
down, pull paper feed knob (HF-99) outward and rotate counter-
clockwise; to move paper up, rotate clockwise. Tractors are
adjustable and are locked in position by fixing knobs (RG-18).
Paper holders (HG-14, 21) are used to keep paper on pin feed
tractors when printer is in use.
Direct coupling of paper feed knob and paper feed shaft
(See Figure HF-99) is accomplished by serrated portion of spring
actuat:ed knob (HG-99) inserting into opposing serrated coupler
(IIF-IOO). When this occurs, while printer is operating, paper
is then moved by logic signals affecting function of the form
feed mechanism (Refer to Figure HH) .
5.20B.2 Removal/Replacement Procedure
A. Paper Drive Shaft (HF-9B) (See Fig. HF),
1. Refer to paragraph 5.2.7.2 for Removal of Paper
Knob (HF-99).
2. Remove spring (HF-105).
3. Loosen set-screws (HF-I02) on coupler (HF-IOO).
4. Loosen set-screw (RF-13) on FF reader gear
(HF-16) .
5. Loosen set-screw (HF-15) on pin feed pulley
(HF-14) •
6. Remove snap ring (HF-6) located in front of
left-hand bushing (HF-3).
7. Loosen two fixing knobs (RG-18) on left and right
pin feed units (HG) and slide both units on driving
shaft (IIF-9B) and guide bar (HF-7) to the extreme
right.
8. Loosen set-screw (HF-9) on collar (HF-8) of
guide bar. Slide collar to right.
9. Remove outside nut (HF-ll) on right end of guide
bar of pin feed unit.
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