Epson DFX-9000 Service Manual page 233

Epson DFX 9000
3. Hold Gear B immobile with your finger, and slowly rotate Gear C
(the SS Gear, attached to the left-end of carriage guide shaft) back
and forth. Check that the needle deflection reading on the APG
Gauge Jig is within 0.002 ~ 0.006 mm (about 1/2 the distance
between two of the smallest markings on the dial). This is equivalent
to a backlash of about 0.03 ~ 0.07 mm between Gear B and Gear C.
If the backlash level is correct, tighten the screws to secure the
APTC UNIT in that position.
APG GAUGE JIG
(Dummy-Head + Dial Gauge)
Platen
Gear B
Gear C
(SS Gear)
Backlash level: 0.03 ~ 0.07 mm =
Dial-Gauge needle movement: 0.002 ~ 0.006 mm
Figure 5-6. Backlash level check
Adjustment
Backlash level = 0.03mm ~ 0.07mm
Hardware adjustment
Revision B
226