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6.
Check that the small hole in the timing disk
(opposite the "9" character) is in line with the
centers of the print wheel drive shaft and the
solar cell mounting shaft. (Figure 4-7).
Adjustment
1.
If
step 5 (of the preliminary adjustments) is in-
correct, loosen the clamping screws in the spur
gear, which drives the print wheel shaft, and
reposition the print wheels.
If
step 5 is correct
but step 6 is incorrect, proceed to step 4 of
adjustments.
2.
Retighten clamping screws in spur gear.
3.
Recheck print wheel alignment with alignment
tool (between the R and the E).
4.
With the print wheels lined up between the R
and the E, loosen the screws on the photo-
emitter disk hub and align the emitter disk so
that the small hole in the disk is in line with the
centers of the print wheel drive shaft and the
solar cell mounttng shaft. (Figure 4-7).
5.
Tighten the screws in the emitter disk hub.
NOTE: The print wheel drive shaft timing
may need slight variation to obtain optimum
print quality of the proper character.
If
the
print wheel drive shaft timing is changed, re-
timing the photo emitter timing disk may also
be necessary.
6.
Repeat service check.
4. 5. 3 Individual Solar Cell Replacement
1.
Loosen the holding screw at the bottom of the
lamp housing and remove the housing.
2.
Loosen the solar cell assembly clamp screw
(Figure 4-7), rotate the assembly 180° clock-
wise, and remove the assembly from the shaft.
3.
Remove the two screws that hold the solar cell
housing and cables to the solar cell assembly.
Loosen, but do not remove, the cable clamp
screw.
4.
Remove the two screws holding the phenolic cell
mounting block to the housing. Slide the block
from the housing.
5.
Unsolder the individual cell being replaced and
remove the "spaghetti" from the lead.
6.
Line the new solar cell up with the other cells
on the block. Solder the lead on the red dot side
of the cell to the terminal that has the black
4-10
(12/66)
wire. Replace the "spaghetti" on the other lead
and solder lead to the terminal that has the
yellow wire. The photo-sensitive side must
face the light source.
7.
Again check the cells for alignment and then re-
assemble the unit in the reverse order.
8.
Check the solar cell and lamp adjustments
(4.5.1).
4. 6 RIBBON FEED AND DRIVE
The ribbon feed and drive mechanism must be
adjusted in the following sequence because the
adjustments are not independent.
1.
Adjust the stroke
2.
Adjust right-hand ribbon feed
3.
Adjust left-hand ribbon feed.
4. 6. 1 Ribbon Feed Stroke Adjustment
Adjust the length and position of the stroke, using
the right-hand ribbon feed mechanism as a reference
(Figure 4-10). Loosen the adjusting screw and move
the link operating lever with relation to the rocker
arm to obtain these two conditions:
1.
The ribbon feed pawl moves 3-1/2 teeth of the
ribbon feed ratchet.
2.
The ribbon feed pawl moves approximately 1/ 4
tooth before contacting the ribbon feed ratchet.
Lock the rocker arm screw in this position.
4. 6. 2 Right Hand Ribbon Feed Adjustment
1.
The feed pawl must not strike the pawl controlling
stud when feeding ribbon onto the spool.
It
should
not leave the stud when feeding ribbon off the spool.
2.
Adjust the eccentric reverse pawl stud so that the
following requirement is met: When the ribbon
reverse lever is operated by the reversing rivet in
the ribbon, the reverse pawl should be in the path of
the pin that is located on the bottom of the ribbon
feed operating arm. See Figure 4-11.
4. 6. 3 Left Hand Ribbon Feed Adjustment
1.
Stroke length has already been adjusted. Properly
position the stroke by adjusting the length of the
operating link (Figure 4-12).
2.
Adjust the ribbon feed pawl and the eccentric
reverse pawl stud for the same conditions as
the right-hand ribbon feed.
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