Oki ML490 Maintenance Manual - Page 21

Temperature compensation See 2.1.8 Alarm Circuit.

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

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42114101
Rev.1
21 /
(d)
Simultaneous Compensation of the number of impact pins
The LSI is provided with the compensation table for each pin to make necessary
compensation.
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
As shown in the drawing left, the stroke length
up to the platen is different for each pin.
Number of impact pins
Few
Many
Drive time
Short
Long
Print Head
Time
Pin 5~20
Pin 1~4,
21~24
Pin coil
current
Pin 1~4
5~20
21~24
Platen
(e)
Print mode compensation
According to the thickness of the printing medium, the print mode is compensated
as shown in the table below:
(Drive time lengthens at each step.)
Head Gap Range
1
2
3
4
5
Print speed
100%
90%
85%
85%
70%
Drive time
Short
Long