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FC-22 TROUBLESHOOTING 4 - 58 January 2000 © TOSHIBA TEC
* Fine adjustment of registration roller paper transport speed
The optimized value is not always obtained for jitter and color deviation because fine error is gener-
ated in automatic adjustment.
If uneven color is generated in the secondary-scanning direction of the image and the further adjust-
ment is necessary, perform the following procedure from 1 to 7.
1. Start up with the test print mode [04].
2. Select the A3/LD cassette.
3. Input the code [234] (output the half tone pattern).
4. Select [M] on the control panel and press [START] key. Since the halftone image is to be continuously
printed out, press [STOP] key when the first paper starts being fed, to make only one print.
5. According to the steps 3 and 4, print out the halftone image of cyan (C) and black (K).
6. Criteria for judging paper transport speed by image
Uneven color of 2.5mm pitch in halftone image is generated.
→Paper transport speed is low.
Uneven color is partially generated at 120mm with magenta, 195mm with cyan and 270mm with black
from the trailing edge.
→Paper transport speed is high.
7. Adjust "Fine adjustment of feed motor rotation speed" of code 05-404 by two steps, assuming the
speed status from the grid pattern image and from the above image criteria 6. After adjusting, repeat
the procedure from 1 to 6. When the step value decreases, the paper transport speed becomes
higher.
When the step value increases, the paper transport speed becomes lower. The speed should not be
too low or too high because either case has harmful effect. (The step value should be approx. within
4289±30.)
Note: First perform the adjustments 05-401 to 403, before proceeding to 05-404, "Fine adjustment of feed motor
rotation speed".
If the adjustment 05-406 is performed, the value of 05-404 is changed. Therefore, perform the settings of 05-
404 again.