Epson 1400 - Stylus Photo Color Inkjet Printer, Service Manual, Page: 35 / 168

EPSON Stylus Photo 1390/1400/1410 Revision B
OPERATING PRINCIPLES Electrical Circuit Operating Principles 35
When the Carriage Unit is Out of the Home Position
1. When the PG position is other than PG++ after power-on, the drive of the APG
Motor is transmitted to the Carriage Shaft, and the PG position changes to PG++.
2. The drive of the CR Motor is transmitted to the Carriage Unit, and the Carriage
Unit returns to the home position at slow speed.
3. The drive of the PF Motor is transmitted to the PF Roller and Paper Eject Rollers
(front and rear), which then rotate for about 2 seconds.
4. After the Carriage Unit has moved to the left by the specified number of steps, the
Wiper is set by the drive of the Pump.
5. After the Carriage Unit has returned to the home position, it moves to the left again
by the specified number of steps. Then driven by the Pump Motor, ink is sucked in
for about 4 seconds, then the Wiper is set, and the CR Lock is locked.
6. The Carriage Unit performs HP detection operation in the following path.
„ Home position
⇒
Right frame
⇒
CR Lock confirmation position
⇒
Right frame
⇒
Home position
7. The drive of the Pump Motor is transmitted to the Cap Unit, the Cap opens
(lowers), and the CR Lock is released.
8. The Carriage Unit returns to the home position, and the PG position returns from
PG++ to PG Typ.
9. The PF Motor drive is transmitted to the PF Roller and the Paper EJ Rollers (front
and rear) to rotate them for predetermined steps.
10. Steps 7 to 9 of “When the Carriage Unit is in the Home Position with the CR
Locked (p34)” is carried out, and the Carriage Unit is locked.
2.3 Electrical Circuit Operating Principles
The electrical circuit of EPSON Stylus Photo 1390/1400/1410 consists of the following
circuits.
† Control circuit board: C655 MAIN
† Power supply circuit board: C589 PSB
† Control panel board: C589 PNL
† Head circuit board: C653 HEAD
The following shows how the four circuit boards are connected.
Figure 2-12. Electrical Circuit Block Diagram
PNL Board
MAIN Board
PSB/PSE Power
Supply Board
Power OFF +3.3VDC +42VDC
Printer
Mechanism
CR Motor
PF Motor
ASF Motor
Head drive circuit
Sensors
Pump Motor
APG Motor