Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer Service Manual page 67

Service Manual
2.1.3.1 Main Motor Functions and Control
The power of the main motor drive is used OPC drum drive, developing drive, fusing drive, and
paper feeding drive.
Figure 2-25 shows the main motor drive circuit. The main motor is a 4 phase stepping motor. This
motor is controlled by the CPU on the engine controller board (MC PWB).
MCU PWB
2.1.3.2 REGI. Sensor and Exit Sensor
The
the paper. This engine starts printing by detecting the signal.
One function is paper size detecting. This printer detects on time of REGI. sensor, while paper is
feeding. This time is long, while longer paper is feeding. This time is short, while shorter paper is
feeding.
One function is paper jam and feed jam detecting to combine for exit sensor.
If the REGI. sensor does not turn on at paper feeding, it will be judged feed jam. The feed jam is the
condition that a paper jam has occurred in the feed process.
If the following conditions are detected, it will be judged paper jam. The paper jam is when paper
is jammed in printing process area.
The REGI. sensor or the exit sensor is on when the power is on or the front cover is closed.
The REGI. sensor or the exit sensor is not turned on/off within the specified time. (Refer to
following timing chart.)
EXIT Sensor
E2: Cassette Feed=4.34
Optional Cassette Feed=6.33
MS I Feed=3.48
Figure 2-26. REGI. Sensor and Exit Sensor On/Off Timing
Rev. A
PIJ14
B ~
/B
Figure 2-25. Main Motor Drive Circuit
Feed or Pickup Solenoid ON
E 2 ~
Operating Principles
Main Motor
[sec.]
2-15