Oki LP-1040 Maintenance Manual page 563

5.
Measure the length of the third printout and check that it falls within the standard range. See
7.2.1 Print Specifications and How to Measure Them (p. 7-4) No.1 for measuring methods
and standard values.
If the measurement falls within the standard range, everything is okay.
Move on to step 9 and finish testing.
If the measurement is outside of the standard range, change the configured correction value.
Move on to step 6.
6.
Calculate the correction value as explained here.
Example 1:
The print length is too short, when
Standard value = 1127.1mm (44.37 inches)±0.5%
Paper length = 1122.8 mm (44.21 inches)
(a) Find the difference from the standard value.
1122.8 (44.21 inches) - 1127.1 (44.37 inches) = -4.3 mm (0.16 inches)
(b) Determine the percent difference that represents from the standard value.
-4.3 ÷ 1127.1 = -0.00382 (approximately 0.38% short)
(c) Check the values saved in the EEPROM, then convert them into a write speed.
Initial value = 3137 -> 1 / (3137 x 128) x 10
Initial value = 4119 -> 1 / (4119 x 128) x 10
(d) Calculate the amount to increase/decrease to return to the standard value.
2490.4 x (-0.00382) = -9.5 (lines/sec)
1896.7 x (-0.00382) = -7.2 (lines/sec)
(e) Calculate the write speed from the increase or decrease in value.
2490.4 - 9.5 = 2480.9 (lines/sec)
1896.7 - 7.2 = 1889.5 (lines/sec)
(f) Convert the write speed into a correction value (setting value), the set that correction
value.
1/(2480.9×128) × 10
1/(1889.5×128) × 10
9
＝ 3149
9
＝ 4135
Chapter 10 Printer Calibrationt
9
= 2490.4 (lines/sec)
9
= 1896.7 (lines/sec)
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