Epson DFX-8500 Service Manual page 83

DFX-8500
SP1 - SP2
1. When the carriage speed reaches SP1, the printer uses the acceleration driving mode, based on the duty
data, and the rest of the time, it uses deceleration driving mode 2.
2. During deceleration driving mode 2, the control circuit measures time periods using the encoder signal,
and controls the following:


If duty data reaches Duty
begins when the carriage speed reaches SP2.


If the carriage speed reaches SP2 before duty data reaches Duty
begins.
SP2 - SPref
When the carriage speed reaches SP2, carriage motor pulse control oversees the carriage speed.
SPref
Acceleration
Deceleration 2
2-30
before the carriage speed reaches SP2, the next sequence (SP2-SPref)
min
SP2
SP1
0
Figure 2-21. Carriage Motor Drive Circuit Block Diagram
, the next sequence (SP2-SPref)
min
Constant
Speed
Control