Laser Optics
SM 3-3 G160/G161
G160/G161
Electrical Board Unit’)
2. LDU [A]
Color Registration Adjustment
You must manually perform 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. Perform 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. Perform 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
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