Epson DFX-8500 - Impact Printer, Service Manual

Page: 80 / 245

DFX-8500
Rev. B
2-26
Table 2-7 lists the CR motor drive modes.
Table 2-7. CR Motor Drive Modes
Division Drive Mode CR Motor Speed
(rpm)
Acceleration /
Deceleration Control
Curve
Note1)
Constant
Speed
Control
Carriage moves Super Draft 2800 Acceleration and PI control
with printing. Super Draft HD 2666 Deceleration 1
Note 2) Draft 2100
Draft HD 2000
Bit image 1 1050 Acceleration and
Bit image 2 1050 Deceleration 3
Bit image 3 1050
NLQ 1050
NLQ HD 1000
Super Draft X 1/3 888
Bit image 4 933
Draft X 1/3 666
Bit image 1 X 1/3 555
Bit image 2 X 1/3 500
Bit image 3 X 1/3 444
NLQ X 1/3 333
Draft X 1/6 333
Bit image 4 X 1/3 277
Bit image 3 X 1/6 222
Carriage moves
without printing Home position
seek 500
Note 3) Paper width
detection seek 500
Logical seek 0 2100
Logical seek 1 1050
Logical seek 2 333
Measurement seek -
Notes 1: Refer to Table 2-8.
Notes 2: This division applies to all printing modes. PI control oversees the constant speed. (Refer
to page 2-27 for more information on PI control.) For increased throughput, the division
Super Draft to Draft HD allows printing during acceleration and deceleration.
Notes 3: This division increases throughput when the carriage is moving and the printer is not
printing.
The printer has three deceleration control modes. The degree of deceleration is determined by how the CR
motor transistors are driven. Table 2-8 describes how the transistors are driven for each mode.
Table 2-8. CR Motor Drive Sequence
Carriage Transfer Direction Driving Mode Driver (Refer to Figure 2-19.)
Q1 Q2 Q3 Q4
Acceleration ON ON
Left -> Right Deceleration 1 ON ON
Deceleration 2
Deceleration 3
ON ON
Acceleration ON ON
Right -> Left Deceleration 1 ON ON
Deceleration 2
Deceleration 3
ON ON