Oki ML420 Maintenance Manual page 21

Print Compensation Control
The print compensation can be made as shown below:
(a) Voltage compensation (See 2.1.8 "Alarm Circuit.")
(b) Temperature compensation (See 2.1.8 "Alarm Circuit.")
(c) Pin stroke compensation
Platen
Pin coil
current
(d) Simultaneous Compensation of the number of impact pins
The MPU is provided with the compensation table for each pin to make necessary
compensation.
Number of impact pins
Drive time
(e) 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
42113901TH01 Rev.3
Print Head
Pin 1,2
3~6
8,9
Pin 1, 2,
8, 9
Pin 3~6
Few
Short
1
100%
As shown in the drawing left, the stroke length
up to the platen is different for each pin.
Time
Many
Long
2 3 4
90% 85% 85%
Short Long
(Drive time lengthens at each step.)
Oki Data CONFIDENTIAL
5
80%
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