Specifications

6.22 Horizontal Vernier Timing Belt
Use the following procedure to remove the horizontal vernier timing belt
(refer to Figure 6–22). Do the reverse of this procedure to reinstall the
timing belt.
1. Use a medium-size screwdriver to loosen the idler bracket adjust-
ment screw.
2. Push down on the idler bracket to release tension and remove the
timing belt.
3. Ensure both upper and lower tractors are positioned full left, then
install the new timing belt. Route the belt as shown in Figure 6–22.
4. Adjust the timing belt tension by applying moderate force on the
tension idler bracket adjustment arm so that the margin adjustment
knob will turn easily. Then tighten the idler bracket adjustment
screw.
5. Check the horizontal alignment of both tractor pairs with the upper
and lower margin adjustment knobs set at the leftmost position. Do
the the following to check horizontal alignment.
a. Set the paper gap adjuster to the LOAD position and paper
tension adjust lever to the upper position, then load paper into
the LG31.
b. Check the adjustment of the paper pin feed holes with the lower
tractors.
c. If the tractors are misaligned, first remove the timing belt.
Then turn the upper margin adjustment knob to align the upper
tractors with the lower tractors. If the lower tractors are to the
left of the upper tractors and the upper tractors are to their
leftmost limit, rotate the timing belt gear one tooth position
on the upper pulley and recheck alignment. Repeat until both
tractor pairs are aligned vertically.
d. Reinstall the timing belt.
6. Power on the printer and execute several form feeds to check the
alignment of the tractor pairs. If an elongation of the pin feed holes
appears, this indicates a misalignment between the upper and lower
tractor pairs.
7. Install the side panels.
6–46 REMOVAL AND REPLACEMENT PROCEDURES