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FC-210/310 TROUBLESHOOTING 4 - 68 February 2002 © TOSHIBA TEC
* Fine adjustment of registration roller paper transport speed
The optimized value against jitter and color misalignment is not always obtained because fine error is
generated in automatic adjustment.
If uneven color is generated in the secondary-scanning direction of the image and further adjustment is
necessary, perform the following procedure from 1. to 7..
1. Start up with the test print mode (04).
2. Select the A3/LD size paper.
3. Enter the code [234] (select the halftone pattern).
4. Select [M] on the control panel and press the [START] key. Since the halftone image is to be continu-
ously printed out, press the [STOP] key when the first sheet starts being fed, to make only one print.
5. Repeat procedures 3. and 4. above to print out the halftone image of cyan (C) and black (K).
6. Judge the paper transport speed status by image.
Uneven color of 2.5mm pitch in halftone image is generated. ৎ 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. ৎ Paper transport speed is high.
7. Adjust "Fine adjustment of registration motor rotation speed (05-410)" by one step, assuming the speed
status from the grid pattern image and the image criteria in procedure 6. above. After adjusting, repeat
procedures 1. to 6. above. 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 2853±30.)
Note: First perform the adjustments "Fine adjustment of drum motor/transfer belt motor and fuser motor (05-401
to 402)", before proceeding to "Fine adjustment of registration motor rotation speed (05-410)".
If the adjustment "Registration motor speed adjustment (05-406)" is performed, the values of "Fine
adjustment of registration motor rotation speed (05-410)" and "Fine adjustment of feed motor rotation
speed (05-404)" are changed. Therefore, perform the settings of 05-404 again.