Carriage Guide Shaft Parallelism Adjustment - Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer Service Manual

Adjustment

4.1.5 Carriage Guide Shaft Parallelism Adjustment

The rear carriage shaft must be parallel to the platen. If it is not, printing maybe abnormal because
paper is not fed evenly at the left and right sides of the platen. A paper jam may occur. This
adjustment is required when the rear carriage guide shaft is removed during carriage mechanism
disassembly, the parallelism adjust lever is moved, or the platen is removti. Do not remove the
printer mechanism (If remove the printer mechanism from the lower case, the adjust value will be
out of order when you reassemble the printer mechanism to the lower case.) Also, it is necessary to
remove the tension roller shaft before performing this adjustment. (Refer to Section 3.2.7.7.)
The parallelism is adjusted so that the difference between the distances (from the rear carriage
shaft to the platen measured at the two positions shown in Figure 4-7) is less than 0.01
guide
mm. Since this value is extremely small, you must use the 2 dial gauges, dial gauge base, and
dial gauge master supplied by Epson. Do not adjust the parallelism using any other method.
i Dial gauge #F610 (Part No. B1019466)
i Dial gauge master #F612 (Part No. B1019468)
Before performing the carriage guide shaft parallelism adjustment, you must assemble the 2 dial
gauges, dial gauge base, md dial gauge master to form one tool. Follow these steps:
1. Loosen a right hexagonal screw, then install a dial gauge to the hole of the dial gauge base, and
tighten a hexagonal saew
Figure 4-5. Set the Dial Gauge to the Dial Gauge Base
2. Remove a CP(PS)(M3X6) screw securing the timing belt holder to the timing belt, then remove
the carriage plate.
Figure 4-6. Removing the Carriage Plate
4-4