Toshiba e-STUDIO 4500c, Service Manual

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IMAGE ADJUSTMENTS August, 2006
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3.19.4 COLOR REGISTRATION
Forced MUSIC Adjustment
The line position adjustment optimizes the quality of color prints. You can do forced
MUSIC adjustment with SP 2111 001:
We recommend that you do the forced MUSIC adjustment at the customer location
immediately after installation, or after servicing or adjusting any parts or
components of the following units:
•
Around the drum
•
ITB unit (especially after belt replacement)
•
Paper Transfer Roller
•
Laser unit
Adjustment of Line Speed for Thick Paper
Adjust the line speed of the fusing unit (the speed of the K development motor)
when:
•
Color shift corrected with the line position adjustment.
•
Color registration shifts more at the trailing edge than at the leading edge.
Color Registration Test and Error Adjustment
Before you start this procedure, make sure that the exposure glass is clean. Also,
make sure that the ITB is installed correctly, especially at the edge.
1. Load A3/DLT paper and select full-color mode.
2. Start SP2109 002 and select pattern 1 (1-dot line), then press the “OK” button.
3. Press the “Copy Window” button. Then select A3/DLT paper, and press the
“Start” button to print the pattern.
NOTE: Make sure that “Full Color Mode” is selected before you press the Start
button.
4. Look at the printout. The horizontal and vertical lines must show no color (must
be black). In that condition, the K, C, M, and Y images are deposited exactly on
top of each other.
5. If there is color on the printout, there is a color registration error, and we must
correct the problem. To correct the problem, do the MUSIC process with
SP2111 001. This takes about 50 seconds.
6. Do step 2 again.
7. If there are color registration errors, then do the procedure described in Section
4 "4.2.2 Color Registration Error Adjustment".