Oki LD670 - Cleaning Thermal Head

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Then, press and hold down the FEED switch for one second or longer to
accept the selection. The printer prints the following when you accept the
selection of "MAX SPEED":
7. Select "9th" as your option.
Press the FEED switch briefly (one second or less) until "9th" is reached.
Then, press and hold down the FEED switch for one second or longer to
accept the selection.
5th
9th (High Speed)
8th
7th
6th
5th
4th
3rd
2nd
1st (Low Speed)
Max Speed
Paper feed direction
Selection Item
9th (High Speed)
↑
8th
↑
7th
↑
6th
↑
5th
9th (High Speed)
8th
7th
6th
5th
4th
3rd
2nd
1st (Low Speed)
Paper feed direction
Selection Item