Oki ML490 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 1~4
Pin coil
current
(d) Simultaneous Compensation of the number of impact pins
The LSI 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
42114101 Rev.1
Print Head
5~20
21~24
Pin 1~4,
21~24
Pin 5~20
1
100%
As shown in the drawing left, the stroke length
up to the platen is different for each pin.
Time
Few Many
Short Long
2 3 4
90% 85% 85%
Short Long
(Drive time lengthens at each step.)
5
70%
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