Service manual

EPSON Stylus Photo 870/1270 Revision B
ADJUSTMENT Adjustment 121
5.2.2 Backlash Adjsutment
This section describes
Backlash Adjsutment
that is to be made after
removing the PF motor. This adjustment provides an appropriate
backlash (
=
0.1 mm or less) for PF motor pinion gear and the gear (76).
You need to make this adjustment when you replace any of the following
parts:
!
PF motor assembly
!
Gear 76
!
PF roller unit
Before you begin, make sure the following parts are removed:
!
COMBINATION GEAR, 13.5, 30
!
TRAY, ABSORBER ASSEMBLY
!
HOUSING, PANEL, LEFT
!
HOUSING, REINFORCING, LEFT
See the following figure for locations.
Figure 5-3. Parts to Remove
CAUTION
Failure in making this adjustment causes the printer to
operate abnormally as described below:
!
If backlash is too little:
1. The PF motor dose not rotate correctly and paper
feeding accuracy declines.
2. Gear 76 and the PF pinion gear make abnormal
noises during printing.
!
If backlash is too large, the PF motor dose not rotate
correctly and paper feeding accuracy declines.
CAUTION
Be careful not to damage the PF Loop scale when
removing COMBINATION GEAR, 13.5, 30.
HOUSING,
REINFORCING, LEFT
HOUSING, PANEL,
LEFT
COMBINATION
GEAR, 13.5,30