Gamma Adjustment - Ricoh AP-P2 G188 Field Service Manual

4. Replacement and Adjustment
To check if SP 2-111-1 was successful, watch the screen during the process. A message is displayed
at the end. Also, you can check the result with SP 2-194-10 to -12.
• You should also do the line position adjustment at these times:
• After you transport or move the machine (you should do the forced line position adjustment if
you install the machine at the user location.) if the machine is pre-installed at the workshop and
moved to the user location,
• When you remove or replace the motors, clutches, and/or gears related to the drum/
development/transfer sections
• When you remove or replace the image transfer belt or laser optical housing unit
4

Gamma Adjustment

• Clean and/or replace related parts first to solve color quality problems. Do these procedures if
adjustments are necessary:
Summary
To adjust the printer gamma:
• Select the print mode you want to calibrate
• Print a color calibration test sheet
• Make the gradation scales on the printout smooth from the lowest to the highest density. Adjust the
CMY gradation scale at the top of the chart by balancing the density of the C, M, and Y gradation
scales – the CMY gray scale should change smoothly from minimum to maximum. There should be
no coloration.
Examine this color adjustment sheet:
104