Epson DFX-8500 - Impact Printer, Service Manual

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DFX-8500
Rev. B
4-12
4.1.7 Platen Gap Motor Value Adjustment
This section describes how to measure the parameter (ALPHA and BETA values) for the PG mechanism
unit. Since the ALPHA and BETA values are unique to each mechanism unit, it is written on the label as
shown in Figures 4-17 and 4-18, so that it can be confirmed at glance. Be sure to perform this measurement
and correct the value written on the label because the value is necessary when the other units (board,
printhead) are changed.
;
This measurement is important because it determines the platen gap, so be sure to use the
exclusive thickness gauge set and tension gauge.
Thickness gauge (0.43 mm)
Thickness gauge (0.80 mm)
Tension gauge (200 g) : #F545 (EPSON Part No. B765114601)
;
Do not turn the printer off during adjustment.
When adjusting the platen gap to narrower or wider using the Micro Feed (^) and Micro Feed (v)
switches, be sure to adjust the gap by 1 step at a time.
;
After perform this adjustment, perform the Bi-Directional adjustment as explained in section 4.1.8.
CAUTION
A L P H A V a l u e P r i n t
P r i n t h e a d
Figure 4-17. ALPHA Value Print
S i d e F r a m e ( L e f t )
P r o d u c t i o n N o .
F r a m e ( F r o n t )
5 m m o r l e s s
B E T A V a l u e
Figure 4-18. BETA Values Print