EPSON Stylus PHOTO 2000P
Revision A
OPERATING PRINCIPLES
Overview
36
2.1.4.2 Platen Gap (PG) /Parallelism Adjustment Mechanism
The PG adjust lever is attached to the left end of the carriage guide shaft.
When the carriage guide shaft, which has an eccentricity, rotates as the
adjustment lever moves, it narrows or widens the distance (=PG: from 1.2
mm to 2.1 mm). This mechanism enables the user to print with a correct
PG according to print result or other conditions such as paper curl.
Also, the parallelism adjustment bushings are attached to the right and
left ends of the carriage guide shaft. They are used to set the carriage
guide shaft parallel with a platen.
Table 2-8.
Platen Gap Adjust Lever Setting
2.1.4.3 Carriage Home Position (HP) Detection
Unlike previous Epson ink jet printers, the carriage home position is
detected with the drive current from the CR motor and speed/position
signal from the linear encoder.
2.1.5 Paper Feeding Mechanism
The paper feeding mechanism transports paper loaded from ASF using
the PF rollers and paper eject rollers. A new type of DC motor is used as
the PF motor. See the table below for the PF motor specifications.
Table 2-10.
PF Motor Specifications
Stepping motor that is used in other printers as the PF motor controls
paper feed by the open loop system. On the other hand, this printer
controls paper feeding mechanism with the closed loop system by
employing the DC motor and rotary encoder for more accurate paper
feeding. Therefore, a rotary encoder attached to the left end of the PR
roller shaft controls paper feed amount. For detailed information, see
Section "PF motor driver circuit".
Drive from the PF motor is sent to the PF rollers and paper eject rollers as
described below.
Drive transmission to the PF rollers:
PF motor pinion gear
→
Spur gear (76)
→
PF rollers
Drive transmission to the eject rollers:
PF motor pinion gear
→
Spur gear (76)
→
Combination gear (13.5, 308)
→
Spur gear (28)
→
Paper eject rollers
Table 2-9.
Lever Position
PG adjustment value
Front (0)
0 mm (=PG is 1.2 mm)
Rear (+)
+ 0.9 mm (=PG is 2.1 mm)
Table 2-11.
Item
Description
Motor type
DC Motor with Brush
Drive voltage
+42V +/- 5% (Applied to the driver)
Coil Resistance
31.1 ohm +/- 25%
Inductance
26.6mH +/- 25%
Control method
Constant current chopping drive
Содержание 2000P - Stylus Photo Color Inkjet Printer
Страница 5: ...5 Revision Status Revision Issued Date Description A May 11 2000 First Release ...
Страница 9: ...C H A P T E R 1 PRODUCTDESCRIPTIONS ...
Страница 31: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 55: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 75: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 118: ...C H A P T E R 5 ADJUSTMENT ...
Страница 138: ...C H A P T E R 6 MAINTENANCE ...
Страница 148: ...C H A P T E R 7 APPENDIX ...
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