Paper Feed Mechanism - Epson SEIJ98006 Service Manual

EPSON Stylus Color 900

2.2.4 Paper Feed Mechanism

The paper feed mechanism manages constant paper feeding during
printing through to paper ejection. Unlike previous models, the PF motor
of this printer only drives the paper feed mechanism, having no
connection with the carriage lock mechanism nor the pump mechanism.
See Figure 2-5 and Table 2-11 for the cross section of the paper feed
mechanism and the PF motor specifications, respectively.
Table 2-11. PF Motor Specifications
No. Items
1 Type 4-phase / 200-pole / HB-type stepping motor
2 Drive voltage 42 VDC
3 Coil resistance 8.1
4 Drive mode Bipolar constant current drive mode
For the printer-specific feature, the PF motor pinion transfers torque to
the PF drive gear without any transmission gear in between. The gears
used for the PF motor pinion and the PF drive gear are very precise.
Therefore, note the points below when handling them:
1. Do not touch the gear surface with your bare hands.
2. Keep other parts or tools for servicing such as screw drivers away
from the gears.
The PE sensor in the paper feed mechanism is used to check the
following:
1. During paper loading, checks if the leading edge of the paper from
the ASF is correctly transported.
2. Checks if the paper loaded meets the specifications.
3. Checks if the paper is properly ejected after printing is over.
4. Checks if paper is jamming.
Operating Principles
Specifications
5% (Applied to the driver)
10%
Printer Mechanism Operating Principles
See Table 2-12 and Table 2-13 for the PE sensor specifications and the
PE sensor switch mode, respectively.
Table 2-12. PE Sensor Specifications
No. Item
Transmission-type photoelectric transfer
1 Type
system
2 Drive voltage 5 VDC 5% (Applied to the driver)
3 Collector resistance 30 VDC or less
Table 2-13. PE Sensor Switch Mode
Paper
Switch mode
installation
Not installed Open
Installed Closed
Figure 2-5. Paper Feed Mechanism
Revision C
Specifications
Output voltage
0.7 VDC or less
2.4 VDC or more
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