Centronics 101AL Technical Manual page 105

9.2.10.2
RIBBON FEED MECHANISM
2. Drive-Left Side
Bevel gear (HI-27) - bevel gear (HI-59) - ribbon spool shaft
~ (HI-57) - ribbon.
Driving Slide Shaft
Above torque transmisssion route for the ribbon feed mechanism
(left and right) is determined by position of driving slide shaft
A (HI-103) (Fig. 5-7), controlled with control spring (HI-93)
(Figure 5-9), reverse control lever (right) (HI-88) (Figure 5-9),
and reverse control lever (left) (H1-905 (Figure 5-7).
Reverse Control Ribbon Movement (left and Right)
Tension of ribbon is applied by ribbon holding plate (HI-44) and
guide rollers (HI-11). When one of ribbon spools becomes empty,
eyelet (or stop plate) on ribbon pulls guide pins on either re-
verse control lever (HI-90, 88) (right) or (left) to change
ribbon feeding direction by setting washer (HI-104) against
reverse control lever (right) or (left) on sliding driving slide
shaft (HI-103). When ribbon does not feed, or ribbon feed
mechanism binds for some reason, a safety feature releases bal]
(HI-76) from hole in driving shaft (HI-79), and torque of driving
gear (HI-75) no longer transmits drive to driving shaft (HI-79).
Removal/Replacement Procedure
Note that all removal/replacement procedures will be done from the
back of the printer. (Fig. 1-9)
A.
Preliminary Disassembly
Perform the following steps prior to removing ribbon reversing
rod (HI-92), sliding drive shaft A (HI-103) or ribbon spool
holders (HI-35, 55).
1. Place left and right side covers in down position.
2. Remove the rear cover.
3. Loosen screw (A-25 of Section 8, Fig. A) on strain relief
bracket (A-13) and set aside cable.
4. Remove screws from cavity (Fig. 1-8) at back of printer.
5. Unplug cable harness from cavity to molex connector (P13)
(Refer Fig. 1-9/3).
6. Remove interface connector (J13) (See Fig. 1-9/4 from
connector (P13) (part cf electronic logic, connector board
6301122 (Fig. 7-38). |
5-33