Ricoh A230 Service Manual page 1109

BULLETIN NUMBER: BULLETIN NUMBER: BULLETIN NUMBER: BULLETIN NUMBER:
APPLICABLE MODEL: : : : APPLICABLE MODEL
APPLICABLE MODEL APPLICABLE MODEL
GESTETNER – 3235S/3535/3245 GESTETNER – 3235S/3535/3245 GESTETNER – 3235S/3535/3245 GESTETNER – 3235S/3535/3245
RICOH – AFICIO 340/350/450 RICOH – AFICIO 340/350/450 RICOH – AFICIO 340/350/450 RICOH – AFICIO 340/350/450
SAVIN – 9935D/9935DP/9945DP SAVIN – 9935D/9935DP/9945DP SAVIN – 9935D/9935DP/9945DP SAVIN – 9935D/9935DP/9945DP
SUBJECT: TONER BAND ON REAR SIDE OF DRUM
SYMPTOM:
A toner band develops on the rear side of the Drum outside of the image area. This toner band causes
the Transfer Belt Assembly to over fill on the rear side and leak toner into the registration and vertical feed
areas.
CAUSE:
The edge of the Development Unit Seal contacts the Drum surface, causing Drum wear.
Occurrence process:
1. The edge of the Development Unit Seal contacts the Drum, causing wear on the Drum surface. As a
result, extra toner sticks to this part of the Drum surface.
2. This toner then accumulates on the Charge Roller Cleaning Pad.
3. The toner on the Cleaning Pad then sticks to the Charge Roller, expanding in width and forming a thin film
on the Roller surface.
4. The electric potential decreases in the area on the Charge Roller surface where the toner film has formed.
A "band" of toner is then transferred to the Drum.
5. This toner band layer is then transferred to the surface of the Transfer Belt. This toner gradually builds up
on the Belt surface, and the Transfer Belt Unit is unable to properly remove it for collection. Eventually,
the accumulated toner falls off the Belt surface and drops toward the rear section of the machine.
COUNTERMEASURE:
The thickness of the Development Unit Seal has been reduced from 0.2 to 0.1mm. In addition, the Seal itself
has been made softer/more flexible. This modification will prevent the Seal from contacting the Drum and
causing wear on the Drum's surface. See illustration below for placement.
NOTE: Only the suffix of the part number has changed. The part number remains unchanged.
   
2000 RICOH Corporation. All rights reserved.
TECHNICAL SERVICE BULLETIN TECHNICAL SERVICE BULLETIN TECHNICAL SERVICE BULLETIN TECHNICAL SERVICE BULLETIN
A230/A231/A232 - 057 A230/A231/A232 - 057 A230/A231/A232 - 057 A230/A231/A232 - 057 09/13/2000 09/13/2000 09/13/2000 09/13/2000
Continued...
CONTROL NO. 054ABW