Epson 2200 Service Manual - Page 42
Carriage Home Position Detection, EPSON Stylus PHOTO 2100/2200, Revision B - stylus photo printer drivers
UPC - 010343841840
View all Epson 2200 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 42 highlights
EPSON Stylus PHOTO 2100/2200 Revision B 2.2.1.2 Carriage Home Position Detection To detect the Carriage home position, the drive current of the CR motor and the speed/ position signal of the CR linear encoder are used as in the conventional Stylus PHOTO 2000P. The basic home position detection sequence is as described below. 1. The CR linear encoder pulse counter in the CPU is reset by the initialization operation performed at power-on. 2. When the CR motor rotates counterclockwise, the Carriage moves from left to right. When the following conditions are satisfied, the CPU assumes that the Carriage made contact with the right frame. 2.1 When the ASIC detected 750/1500 counts or more in the PWM output under CR motor load positioning control, the temporary home position A is set as contact with the frame. 2.2 P1 (number of output pulses from when power is switched on until the Carriage makes contact with the right frame) is 40 steps or less between reset 0 and A. 3. When the CR motor rotates clockwise, the Carriage moves from right to left. When the following conditions are satisfied, the CPU assumes that the Carriage made contact with the CR lock lever. 3.1 When the ASIC detected 480/1500 counts or more in the PWM output under CR motor load positioning control, the printer judges that the Carriage made contact with the CR lock lever. 3.2 A difference between P2 (number of output pulses from when the Carriage made contact with the right frame until it makes contact with the Carriage lock lever) and P1 is yy or less, and the number of outputs between A and CR lock lever is 40 steps or less. 4. When the CR motor rotates counterclockwise to move the Carriage from left to right and the CPU detects 750/1500 counts or more in the PWM output under CR motor load positioning control, the printer judges it as contact with the frame. At this time, the carriage position B is stored. 5. If a difference between P3 (number of output pulses from when the Carriage made contact with the Carriage lock lever until it makes contact with the right frame) and P1 has become Z or less, the printer judges that the Carriage is in the home position. If a position difference between the temporary home position A and the second frame contact position B is 4 steps or less, the printer judges it as a home position. Based on the output pulses (signals) from the CR linear encoder, the IC30 (ASIC) sets the drive current value adequate for the carriage motion (carriage moving direction and carriage position) of each operation and outputs it to the motor driver as a special control signal. Based on the signal output from the IC30 (ASIC), the IC24 (CR motor driver) outputs the CR motor drive current to the CR motor. OPERATING PRINCIPLES Printer Mechanism 42