我同意版主的说法，这个做法不是解决根本之道。不过楼主的做法是用户排除故障的第一步，试试机器的自动功能是否可以自动调整回来，希望小事可以化了，也是说明书建议的。
SC45-20 service code while making copies.
Solution
CAUSE: A color registration failure.
SOLUTION:
Replace the transfer belt and transfer rollers. Perform the color correction calibration of the sensors PS8 and PS9.
Notes:
To calibrate the sensors, perform the following:
1. Disable Color Registration Correction Control in the 25 mode, software dip switch 25, bits 3 to 1 (ON) and bit 4 to 0 (OFF).
2. Run the [Auto Color Registration Adjustment] in the 36 mode.
3. Try Running the Manual Registration Adjustment.
4. Remember to enable Color Registration Correction Control after the adjustment.
If the problem persists, there could be a dirty or failed color registration sensor (PS8 or PS9). Check their operation in the 47 service mode. Replace the
failed sensor, if necessary.