Electrical Circuit Operating Principles; When The Carriage Unit Is Out Of The Home Position; Electrical Circuit Block Diagram - Epson Stylus Photo R1800 Service Manual

EPSON Stylus Photo R1800/R2400

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 leftward by the specified number of
steps, the Wiper is set, driven by the Pump.
5. After the Carriage Unit has returned to the home position, it moves leftward
again by the specified number of steps. And, driven by the Pump Motor, ink
is sucked for about 4 seconds and then the Wiper is set, and the CR Lock
is placed.
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 Type.
9. The PF Motor drive is transmitted to the PF Roller and the Paper EJ
Rollers (front and rear) to rotate them for about 2 seconds.
10. The Step 7 to 9 of "When the Carriage Unit is in the Home Position with the
CR Locked (p30)" are performed, and the Carriage Unit is locked.
Operating Principles

2.3 Electrical Circuit Operating Principles

The electrical circuit of Stylus Photo R1800 consists of the following circuits.
Control circuit board
Power supply circuit board : C589 PSB
Control panel board
Control panel B board
The following shows how the four circuit boards are connected.
Electrical Circuit Operating Principles
: C589 MAIN
: C589 PNL
: C589 PNL-B
PNL Board
MAIN Board
Power OFF +3.3VDC +42VDC
PSB/PSE Power
Supply Board
Figure 2-12. Electrical Circuit Block Diagram
Revision B
Printer
Mechanism
CR Motor
PF Motor
APG Motor
ASF Motor
Pump Motor
Head drive circuit
Sensors
31