Print Compensation Control; Space Motor Control - Oki Pacemark 4410 Service Handbook

2.1.9

Print Compensation Control

The print compensation can be made as shown below:
(a) Simultaneous Compensation of the number of impact pins
The NHDC LSI is provided with the compensation table for each pin to make necessary
compensation.
Number of impact pins
Drive time
(b) Duty control
1. If the number of the lines which exceeds 60% printing duty is continuous 8 lines, the printer
starts 2-path printing at the 8th line.
2. If the printer can activate 12 pins simultaneously in a line, it 2-path prints the line.
(c) Temperature compensation (See2.1.14 "Alarm Circuit.")
(d) Print mode compensation
According to the thickness of the printing medium, the print mode is compensated as shown
in the table below:
Head Gap Range
Print speed
Drive time

2.1.10 Space motor control

(1) The Main LSI generates the SPDV-P signal upon receiving the spacing command from the
MPU. This is a fixed cycle pulse signal.
The Main LSI varies the pulse duty according to the speed data from the MPU to control the
motor speed.
The SPFOW-P or SPREV-P signal from the Main LSI changes the current direction in the DC
motor to run the motor in the forward or reverse direction.
SPFOW-P
SPREV-P
SPDV-P
MotorCurrent
40496501TH Draft Version
Few
Short
1 2 3
100% 97% 95% 90%
Short
Figure 2.13
Many
Long
4 5
89%
Long
(Drive time lengthens at each step.)
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