Ld Unit; Color Registration Adjustment - Ricoh G104 Service Manual

LASER OPTICS

3.3.2 LD UNIT

1. Electrical boards unit ( 3.2.1)
2. LDU [A]
NOTE: Print the SMC report with
SP 5990-002 before you
replace the LDU.

Color registration adjustment

NOTE: You must manually perform the color registration adjustment after you
install a new LDU.
Perform these steps:
NOTE: When the polygon mirror motor or Laser Diode Board (LDB) unit is
defective, only replace the defective parts. At this time, it is not necessary
to do this adjustment procedure.
1. Print the SMC report with SP 5990 2 before you replace the LDU. ( 5.1.1)
Find the values for SP 2181 1, SP 2181 11, 2181 21, and 2181 31, and make a
note of them.
2. Execute 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. Execute 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 and write down the values. (You can also
check these values 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 skew
• SP 2181 21 for cyan skew
• SP 2181 31 for yellow skew
NOTE: The new skew values for magenta, cyan, yellow and black must all be the
same as the original skew value for magenta that was recorded in step 1.
The magenta color is used as a reference point.
G104
CÓPIA NÃO CONTROLADA
3-8
CÓPIA NÃO CONTROLADA
[A]
G105R106.WMF
SM