Epson Stylus Photo 950, Service Manual

Page: 29 / 191

EPSON Stylus PHOTO 950 Revision A
OPERATING PRINCIPLES Printer Mechanism 29
2.2.2.2 Platen Gap Adjustment Mechanism and
Parallelism Adjustment Mechanism
The adjust lever is installed to the left end of the carriage guide shaft.
The carriage guide shaft is an eccentric shaft that rotates when the adjust lever is
operated in order to increase or decrease the gap (platen gap or PG) between the platen
surface and the surface of the printhead. This mechanism allows the user to select the
optimum platen gap in accordance with the desired printing results or in accordance
with other printing conditions such as paper curl. (See Table 2-3.)
In addition, the parallelism adjustment levers that are installed to the left and right ends
of the carriage guide shaft adjust the degree of parallelism between the carriage guide
shaft and the platen.
NOTE: (*1)Full release position
The printer can detect the position of the adjust lever by means of the release sensor
and the PG sensor.
2.2.2.3 Carriage Home Position Detection
The method used to detect the carriage home position is the same method used in
previous model (EPSON Stylus PHOTO 890) whereby the CR motor drive current and
the speed and position signals from the linear encoder are used to detect the position.
(See "CR Motor Driver Circuit" on page 50 for further details.)
Table 2-3. Adjust Lever Settings
Paper Type Adjust Lever Gap adjust
Cut Sheet, OHP, Label First Front Position 0mm
Envelope, Cardboard Second Front Position +1.3mm
CDR Third Front Position +2.7mm
- Back Position
(*1)
-