April, 2007 SPECIAL PROCEDURES 4-21
General Displayed
Code Item Major Cause Action
56 Development
Gamma Error
2
Development gamma (SP3561)
less than 0.3 (mg/cm2/-kV)
• Toner supply abnormal
• Image transfer power pack
defective
• Toner shield glass dirty
1. Do SP2109 002 and select Pattern 12.
2. Do SP2109 005 to 008 and change the settings of these SP codes
from 63 (default) to 0.
3. Return to the copy window and do the test print 1 pattern.
4. Check the pattern to determine whether the image density is
extremely light.
5. Turn the machine OFF.
6. Open the front door, remove the toner supply unit and check the
toner shield glass for dirt.
7. Remove the face plate, replace the malfunctioning PCU with a
functioning PCU, then turn the machine ON and repeat Steps 1 to 3
to print the coverage test pattern.
8. If normal operation cannot be recovered:
• Replace the image transfer power pack.
• Open the development unit to see if there is too much or too little
developer.
• If the developer supply is normal, remove the toner end sensor to
see if there is toner in the sub hopper.
• If the sub hopper is empty, the powder pump is defective.
Replace the toner supply unit.
• If the sub hopper is full, the toner end sensor is defective.
Replace the toner supply unit.
• If the level of developer is either too high or too low, replace the
developer.
57 Vk Error 1 Vk (development start voltage)
greater than 150V. • Replace the developer.
58 Vk Error 2 Vk (development start voltage)
less than
–150V.
• Replace the developer.
59 Insufficient
Active Data Not enough active data to
calculate development gamma
(only "0" or "1").
• Do the "Action" procedure for "Displayed code #55" described
above.