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SUBJECT:
BLACK LINES ON COPIES
SYMPTOM:
Short black lines called "Medaka" appear on copies.
CAUSE:
If a large number of duplex copies are made, the temperature in the copier will rise as the paper passes
through the Fusing section. Paper dust may also contribute to this symptom but the degree will vary
depending upon the type of paper used. The mixture of toner and paper dust is attracted to the Drum's
surface. Since the temperature in the copier is higher, this mixture becomes softer and makes it more
difficult for the Cleaning Blade and Brush to completely remove it from the Drum.
SOLUTION:
Install the Lubricant Bar (A1763515) if short black lines appear or if Medaka is a chronic symptom. See
Installation Procedure provided below.
INSTALLATION PROCEDURE:
Before installing the Lubricant Bar, the Developer should be replaced. Also, the OPC Drum should be
replaced or cleaned completely.
1. Prepare the Lower Drum Unit (P/N: A1763510); by removing the Drum Unit Harness (P/N:
A1755440 from this unit.
2. Remove the Drum Unit from the copier, then remove the Lower Drum Unit, and remove the Drum Unit
Harness (P/N: A0965440) from this unit. Then, install this Harness on the Lower Drum Unit (P/N:
A1763510)
CAUTION: If the Drum Harness is not replaced with P/N: A0965440, the Charge Power
Pack will be damaged.
Note: The Drum Unit Harness color (two lines) for the Pre-transfer Lamp is different between the models:
P/N A0965440: white/white (A095/A096/A097)
P/N A1755440: white/blue (A175/A176/A177)
3. Replace the Lower Drum Unit with P/N A1763510.
4. Change the VP data from 0V (default) to – 40V using the SP Mode adjustment 1 (Page 8, Item8).
RICOH GROUP COMPANIES
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Continued...
CONTROL NO. 314
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