Epson DFX-8500 Service Manual page 82

DFX-8500
‰Deceleration control:
Deceleration control provides smooth deceleration and prevents rapid vibration.
The duty data for deceleration control is determined for each printing mode. Pulse width modulation (PWM)
determines each printing mode.
Current speed - SP3
1. The printer uses Deceleration driving mode 2, based on the duty data, and the rest of the time, it uses
Deceleration driving mode 1.
2. During this time the control circuit measures time periods using the encoder signal, and controls the
following:
When duty data becomes Duty
When the carriage speed reaches SP3 before duty data becomes Duty
Speed 0) takes effect.
SP3 - Speed 0
1. When the carriage speed reaches SP3, Deceleration driving mode 3 takes effect. This control method is
the inverse-continuity break method.
2. During this time, the control circuit measures time periods using the encoder signal. When the rising
edge of next pulse is not detected after 1.5 seconds, Deceleration driving mode 1 takes effect and the
control circuit controls short-break.
Note: 1, 2, and 3 indicate the PWM control section number.
2-28
before the carriage speed reaches SP3.
min1
Figure 2-22. CR Motor Drive Circuit Block Diagram
, the next sequence (SP3 -
min1
Rev. B