Ricoh FT4480 Field Service Manual page 207

15 March 1987
3. DIRTY BACKGROUND AROUND WHITE SPOTS
- Possible Causes -
• Condensation on the drum due to rapid temperature change. This
phenomenon may occur early on winter mornings.
- Action -
The problem should disappear after about 20 copies. If it does not,
perform drum conditioning.
HAT IMAGE
- Possible Causes -
• Defective quenching lamp
• Charge corona wire miscounted
• Incorrect corona current
• Old developer
- Action -
Does the quenching lamp turn on?
Y N
I
Does CN203-8 drop from +24 volts to ground?
Y N
I
• Check the connector and harness.
Replace the quenching lamp.
Is the charge corona wire properly installed?
Y N
I
• Install the charge corona wire correctly.
• Replace any defective parts.
Is the charge corona current correct?
Y N
I
Adjust the charge corona current.
Replace the developer.
9-2