Color Registration Adjustment - Ricoh G190 Service Manual

1. Electrical board unit (
2. LDU [A]

Color Registration Adjustment

You must manually do the color registration adjustment after you install the new
LDU.
When the polygon mirror motor or LDB unit is defective, only replace the defective
parts. At this time, if only the motor is changed it is not necessary to do this
adjustment procedure.
1. Print the SMC report with SP 5990 2 before you replace the LDU. Find the values for SP
2181 1, SP 2181 11, 2181 21, and 2181 31.
2. Do SP 2111 2 (Pro. Position Adj > Execute) to roughly adjust the line position after you
install the new LDU. "Result = OK" shows on the LCD if this is done correctly. If not, do it
again until you get "OK".
3. Do SP2111 3 (Skew Adjust. > Execute) to measure the skew values for each color.
"Result = OK" shows on the LCD if this is done correctly. If not, do it again until you get
"OK".
4. Check the skew values with SP 2181: Then write down the values. (You can also check
these if you print the SMC report again with SP 5990 2. The values will probably be
different from the values on the report that you printed in step 1.)
SP 2181 1 for black skew
SP 2181 11 for magenta
SP 2181 21 for cyan
SP 2181 31 for yellow
5. Open the left cover
SM
Electrical board unit)
3-15
Laser Optics
G190