Ricoh FT4480 Field Service Manual page 221

15 March 1987
B L A N K C O P Y
- Possible Causes -
Charge corona wire mismounted or broken
Defective power pack
Defective main board
- Action -
Is there a faint image?
Y N
I
Is the charge corona wire (or unit) incorrectly installed?
Y N
I
Does the main board output the correct signal to the power pack
(CN206-A22 drops from +24 volts to ground)?
N
I
Replace the main board.
Clean the charge corona unit and remove any foreign
substances that might cause a leak.
If the problem still exists, replace the charge power pack.
Reset the charge corona wire (or unit).
Does the density gradually drop when making copies?
Y N
I
Is the transfer corona wire (unit) incorrectly installed?
Y N
I
Does the main board output the proper T/S trigger signals?
Y N
I
Replace the main board.
Replace the transfer corona power pack.
Reset the transfer corona wire (unit).
Check the development drive mechanism and clean or replace any defective
parts.
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