Ricoh B230 Service Manual

 
SM 6-43 B230/B237 
Detailed 
Descriptions 
From Image Transfer Belt Unit 
 
The toner collection auger [A] moves the used toner from the image transfer belt and the 
used toner drops into the toner collection duct [B]. The toner collection coil [C] moves the 
used toner to the opening [D] at the rear of the toner collection bottle. The toner transport 
motor [E] drives the toner collection coil. 
Used Toner Distribution Mechanism 
 
The toner collection bottle has two openings (front and rear). The...

 
B230/B237 6-44  SM 
6.8.2 TONER COLLECTION BOTTLE SET/ NEAR-FULL/ FULL 
DETECTION 
 
The toner collection bottle has a projection at its rear side. When the toner collection bottle 
is set, this projection pushes the waste toner bottle set switch at the rear of the machine. As 
a result, the machine detects that the toner collection bottle is installed. 
The bottle near-full/full detection mechanism is above the bottle. When the used toner 
pushes up the used toner feeler [A], the waste toner sensor...

 
SM 6-45 B230/B237 
Detailed 
Descriptions 
6.9  IMAGE TRANSFER AND PAPER SEPARATION 
6.9.1 IMAGE TRANSFER 
Overview 
 
 
1. Image transfer belt (ITB) 
2. ID sensor 
3. ITB drive roller 
4. Paper transfer roller 
5. Rotation encoder 6. Lubricant application roller 
7. Toner collection auger 
8. Cleaning blade 
9. Cleaning roller 
10. Image transfer roller 
 
The toner is moved from the four drums to the ITB by the four image transfer rollers. This is 
done with one rotation of the ITB (four toner images...

 
B230/B237 6-46  SM 
ITB (Image Transfer Belt) Drive 
Drive Motor 
 
The ITB drive motor [A] drives the image transfer belt [B] and the cleaning unit via gears 
and the ITB drive roller [C]. The speed of ITB drive depends on the process line speed (see 
‘Laser Exposure – Optical Path’). 
Transfer belt speed control 
 
This machine uses the rotation encoder to control the transfer belt speed.     
The encoder [A] is on one of the rollers. This encoder checks the rotation speed of the 
image transfer...

 
SM 6-47 B230/B237 
Detailed 
Descriptions 
 
Filter H:   
The number of notches read by the sensor when the rotation speed of the transfer belt is at 
its highest possible value. 
Filter L:   
The number of notches read by the sensor when the rotation speed of the transfer belt is at 
its lowest possible value. 
ITB Current 
 
Each image transfer roller [A] applies current to the image transfer belt to attract the toner 
from each drum [B]. The high voltage supply board supplies current to the image...

 
B230/B237 6-48  SM 
Transfer belt cleaning 
 
The ITB-cleaning unit removes toner (during printing) and the ID sensor patterns (during 
process control or automatic line position adjustment) on the belt. Belt cleaning is 
completed while the image transfer belt makes one rotation. The ITB drive motor drives the 
ITB-cleaning unit. 
The cleaning brush [A] always contacts the image transfer belt [B], and removes used toner 
from the belt. The cleaning blade [C] in the cleaning unit scrapes the toner off...

 
SM 6-49 B230/B237 
Detailed 
Descriptions 
ITB (Image Transfer Belt) Contact 
 
Mechanism  
The ITB contact and release mechanism increas es the lifetime of the image transfer belt 
and drums. The drum for black always contacts the belt. But the image transfer belt moves 
away from the other drums during monochro me printing. In the standby mode, the image 
transfer belt contacts only the black drum. It  moves away from the black drum when you 
turn the release lever counterclockwise.   
When the...

 
B230/B237 6-50  SM 
 1.  Remove the Image Transfer Belt Contact Motor [A] (
 sec. 3.10.8). 
2.  Using needle nose pliers, turn  the Transfer Belt Contact Motor Shaft [B] until the flat 
surface of the shaft is facing up          . 
 
3.  Open the front cover of the machine and ens ure the Transfer Belt is away from the 
OPC units before removing. 
4.  To reinstall the Transfer Belt Contact Mo tor, first turn the shaft [B] until the flat 
surface is facing down     . 
5.  Reinstall the Transfer Belt...

 
SM 6-51 B230/B237 
Detailed 
Descriptions 
6.9.2  PAPER TRANSFER AND SEPARATION 
Overview 
 
 
1. Paper transfer roller 
2. Discharge plate 
3. ITB drive roller 4. Image transfer roller 
5. Image transfer belt 
6. OPC drum 
 
The paper transfer unit consists of the paper transfer roller and discharge plate. This unit 
completes the toner transfer to the paper.   
PTR (Paper Transfer Roller) Drive 
 
 
ƒ P.P.: Power Pack  

 
B230/B237 6-52  SM 
The toner is moved from the OPC [A] onto the surface of the image transfer belt [B] by a 
positive charge from the image transfer roller (immediately above the drum, not shown 
here). The ITB drive roller [C], which is given a negative charge, pushes the toner to the 
paper [D].   
The paper transfer roller [E] presses the paper against the image transfer belt [B] (with a 
spring that is under tension from the paper transfer roller contact motor), and grounds the 
charge from the...