Ricoh Mp C3000 Service Manual

 
SM 6-31 B230/B237/D042 
Detailed 
Descriptions 
6.6  PCU (PHOTO CONDUCTOR UNIT) 
6.6.1 OVERVIEW 
 
 
1. OPC drum 
2. Cleaning blade 
3. Brush roller   
4. Lubricant bar 
5. Lubricant application blade 
6. Cleaning roller (charge roller)  7. Charge roller (non-contact) 
8. TD sensor/ID chip 
9. Mixing auger 
10. Development roller 
11. Inner pressure adjustment filter 
 
This machine has four tandem PCUs. Theref
ore, four color developments are possible 
during one paper path. This improves the pr...

 
B230/B237/D042 6-32 SM 
6.6.2  AROUND THE DRUM 
Drum Drive 
 
The drum/development drive motor-K [A] drives the drum unit for black.   
The drum drive motor-CMY [B] drives the dr um units for magenta, cyan, and yellow. Using 
one motor to drive these three drums reduces CMY color misalignment. 
Both motors are brush-less DC motors. Th is helps to reduce the drive noise.   
Phase Control Mechanism 
The machine uses the drum gear position sensors to detect if the drum motors rotate. 
SC380 shows when it...

 
SM 6-33 B230/B237/D042 
Detailed 
Descriptions 
Drum Charge and Quenching 
 
This machine uses a non-contact charge ro ller [A] to reduce ozone. The non-contact 
charge roller gives the drum surface a negativ e charge. The high voltage supply board – 
C.B, which is located at the rear of the ma chine, applies a dc and ac voltage (at a constant 
current) to the roller. The ac voltage helps to ens ure that the charge given to the drum is as 
uniform as possible. 
The machine automatically contro ls the...

 
B230/B237/D042 6-34 SM 
Drum Cleaning 
 
The cleaning blade [A] scrapes off the used t oner that stays on the drum. The toner 
collection auger [B] transports the used toner  towards the toner collection duct. Then it 
goes to the toner collection duct. The brush ro ller [C] put lubricant on the drum to make 
toner removal easy the next time the drum rotates past the cleaning blade.   
If the temperature is above the va lue of SP 3517, the drum reverses briefly at the end of the 
job to prevent the...

 
SM 6-35 B230/B237/D042 
Detailed 
Descriptions 
6.6.3 DEVELOPMENT 
Development Operation 
 
This machine uses a dual-c omponent development system and  has four development units 
(which are included in the drum units), one  for each color. Each contains 225 g of 
developer when it is new. The developer in each  unit is supplied to the development roller 
[A] by the two mixing augers [B] and attrac ted onto the surface of its roller.   
The TD sensor [C] in the development unit and  four ID sensors...

 
B230/B237/D042 6-36 SM 
Drive 
 
The drum/development drive motor-K [A] driv es the development roller for black through 
gears and a clutch. The gear trains  are shown in the diagram. 
The development drive motor-CMY [B] drives  the development unit for magenta, cyan, and 
yellow through gears.   
Developer Agitation 
 
Two mixing augers [A] circulate the devel oper forward and backward to agitate the 
developer. 
This happens at the following times: 
ƒ  During process control self check 
ƒ During...

 
SM 6-37 B230/B237/D042 
Detailed 
Descriptions 
ƒ During development. 
Filters [B] on the top of the developer hopper make  sure that the internal pressure does not 
become too high. These  ducts are sealed not to let the t oner solidify before installing.   
This development unit does not operate well if  it placed in a condition of over 50°C during 
transportation. The toner inside the developmen t unit can become solid at temperatures 
higher than this value. A developer initialization error shows...

 
B230/B237/D042 6-38 SM 
The machine automatically does the following adjustments when detecting the new unit 
detection flag. 
ƒ  PM counter clear for items related to the PCU 
ƒ Developer initialization 
ƒ  Charge roller voltage control 
ƒ Process control 
ƒ  Line position adjustment 
If the PM counter clear fails,  clear the following SPs manually. 
ƒ  SP3-902-1 to -4   
ƒ  SP3-902-5 to -8 
ƒ  SP3-902-9 to -12 
6.7 TONER SUPPLY 
6.7.1 OVERVIEW 
 
 
1. Toner bottle (each color) 
2. Memory chip (each...

 
SM 6-39 B230/B237/D042 
Detailed 
Descriptions 
toner to the development unit. 
The toner end sensor is atta ched to the toner supply tube.  The toner end sensor and the 
output from the process control defi ne when the machine detects toner end. 
6.7.2  TONER SUPPLY MECHANISM 
Toner supply from toner bottle to toner attraction pump 
 
The toner transport motor [A] rotates the toner bottle-Bk via gears and a clutch. It also 
rotates the toner bottle-Y, -C, -M via gears, clutches and timing belts....

 
B230/B237/D042 6-40 SM 
Toner supply from toner attraction pump to development unit 
 
Each toner attraction pump [A] is driven by  the toner transport motor [B]. Each toner 
attraction pump has the same mechanism.  The pump (toner attraction pump) has the 
following components:   
ƒ  Toner supply clutch [C] 
ƒ Rubber tube  
ƒ Rotor [D] 
The above components attract the toner in the toner transport tube [E] toward the 
development unit. 
The toner supply clutch controls the rotor, which draws the toner...