Carriage Guide Shaft Parallelism Adjustment - Epson DFX-8500 Service Manual

4.6 CARRIAGE GUIDE SHAFT PARALLELISM ADJUSTMENT

The rear carriage guide shaft must be parallel to the platen to prevent uneven paper feeding and paper
jams. Perform this adjustment when you remove the rear carriage guide shaft or platen, or move the
parallelism adjustment lever. Do not remove the printer mechanism or the adjustment will be undone when
you install it. Remove the tension roller shaft before performing this adjustment. (See Section 3.2.6.7.)
The difference between the distances from the rear carriage guide shaft to the platen measured at the
two ends of the shaft must be less than + 0.015 mm. Since this value is extremely small, you must use
the two dial gauges, a dial gauge base, and a dial gauge master supplied by EPSON to measure it. Do
not adjust the parallelism using any other method.


Dial gauges (x 2) #F610 (Part No. B1019466)


Dial gauge base #F611 (Part No. B1019467)


Dial gauge master #F612 (Part No. B1019468).
Before performing the parallelism adjustment, you must assemble the two dial gauges, dial gauge base, and
dial gauge master. Follow these steps:
1. Attach the two thumbscrews for the dial gauge base to the dial gauge master. To eliminate any play, pull
the tie band between the two dial gauges to secure the dial gauge base and the dial gauge master
before you tighten the thumb screws.
Figure 4-5. Attaching the Dial Gauge Base to the Dial Gauge Master
2. Put a dial gauge through the dial gauge base, depressing the needle against the master to a depth of
approximately 0.04 inch (1 mm). (See Figure 4-6.)
CAUTION
Master
ADJUSTMENT
Base
4-5