Ricoh Mp C3000 Service Manual

							 
SM 6-1 B230/B237/D042 
Detailed 
Descriptions 
6.  DETAILED SECTION DESCRIPTIONS 
6.1 OVERVIEW 
6.1.1 COMPONENT LAYOUT 
 
 
1. Scanner HP sensor 
2. ADF exposure glass 
3. 2nd scanner (2nd carriage) 
4. Exposure glass 
5. Original width sensor 
6. Scanner lamp 
7. 1st scanner (1st carriage) 
8. Original length sensor 
9. Lens block  14. Paper transfer roller 
15. Registration roller 
16. By-pass feed table 
17. Tray 2 
18. Tray 1 
19. Toner collection bottle 
20. Laser optics housing unit 
21. PCU (4 colors) 
22. Image transfer belt cleaning unit  
						

							 
B230/B237/D042 6-2 SM 
10. Sensor board unit (SBU) 
11. Scanner motor   
12. Fusing unit 
13. Duplex unit 23. Image transfer belt unit 
24. Toner bottle (4 colors) 
25. ID sensor 
 
6.1.2 PAPER PATH 
This diagram shows the copier with the 1000-sheet booklet finisher. 
 
1. Original tray 
2. Original exit tray 
3. Duplex inverter 
4. Duplex feed 
5. By-pass tray feed 
6. Tray 1 feed 
7. Tray 2 feed  8. Tray 3: Optional paper feed unit/LCT 
9. Tray 4: Optional paper feed unit 
10. Finisher stapler (Optional) 
11. Finisher punch (Optional) 
12. Finisher lower tray (Optional) 
13. Finisher proof tray (Optional) 
14. Inner Tray 
The 1000-sheet finisher and 1000-sheet booklet finisher require the bridge unit (B227) and 
one from the two-tray paper feed unit (B800) or the LCT (B801).  
						

							 
SM 6-3 B230/B237/D042 
Detailed 
Descriptions 
6.1.3 DRIVE LAYOUT 
 
 
1. Scanner motor:  Drives the scanner unit. 
2. Drum drive 
motor-CMY:  Drives the drums for magenta, cyan, and yellow. 
3.ITB (Image Transfer 
Belt) contact motor: Moves the ITB into contact and 
away from the color PCUs. 
4. Toner transport motor: Drives the toner attraction pumps
 and the toner collection coils 
from the PCUs, from the trans fer belt unit, and inside the toner 
collection bottle. Also rotates the toner bottles. 
5. Development drive 
motor-CMY:  Drives the color development units (magenta/cyan/yellow). 
6. Development clutch-K  Turns on/off t
he drive power to the development unit-K.  
						

							 
B230/B237/D042 6-4 SM 
7. Paper feed clutch  Switches the drive power between the tray 1 and tray 2. 
8. Paper feed motor:  Drives the paper feed mechanisms (tray 1/tray 2/by-pass tray). 
9. Drum/Development 
drive motor-K: Drives the black drum and development unit. 
10. Registration motor:  Drives the registration roller. 
11. Paper transfer 
contact motor Moves the paper transfer roller in contact with the image 
transfer belt. 
12. ITB drive motor:  Drives the image transfer belt unit. 
13. Fusing/paper exit 
motor: 
Drives the fusing unit and paper exit section. 
6.1.4 BOARD STRUCTURE 
Overview 
 
 
ƒ  In the diagram, ‘MLB’ is the File Format Converter 
Descriptions  
BICU (Base Engine Control Unit):  
The BICU controls all the mechanical com ponents. The BICU has six CPUs. The CPUs  
						

							 
SM 6-5 B230/B237/D042 
Detailed 
Descriptions 
control the following functions: 
ƒ Engine sequence 
ƒ Engine operation 
ƒ  Polygon motor control 
ƒ Image processing 
Controller:  
The controller connects to the BICU through a PCI bus. The controller handles the 
following functions: 
ƒ Machine-to-host interface 
ƒ  Operation panel interface 
ƒ Network interface 
ƒ  Interfacing and control of  the optional IEEE1284, Bluetooth, IEEE1394, IEEE802.11b 
(wireless LAN), USB Host, HDD, and DRAM DIMM 
LD Drive Board:  
This is the laser diode drive circuit board. 
SBU:  
The Sensor Board Unit has a CCD (charge -coupled device) and an analog-to-digital 
conversion circuit. 
Operation Panel Board: 
This controls the display panel, the LED and the keypad. 
Scanner I/O Board (SIO):  
The scanner I/O board is a circuit board that  transmits control signals, image data, and 
electricity. 
I/O Board (IOB):  
Contains drivers for motors  and other mechanical components. 
Motherboard:  
Connects the FCU board to the BICU. This  board is supplied with the optional fax unit. 
FCU:  
The FCU (fax controller unit ) controls the fax programs and communicates with the 
controller to share copier resources.  
						

							 
B230/B237/D042 6-6 SM 
6.1.5 PRINTING PROCESS 
 
This machine uses four PCUs, and four laser  beams for color printing. Each PCU consists 
of the drum unit and the development unit. Ea ch drum unit has a drum, charge roller, 
cleaning brush, and blade. From the left, the  PCU stations are yellow, cyan, magenta, and 
black. 
The drum [A] is charged with a negative voltage,  and is exposed by the laser from the laser 
optics housing unit [B]. The laser neutralizes  the negative charge on the surface of the 
drum. So, the white parts of the image correspond to areas of the drum that still have a high 
negative charge. The toner  has a negative charge, and it mo ves to the areas of the drum 
that have the smallest negative charge (i.e ., the areas written by the laser beam).   
The image on each drum is moved to  the transfer belt by the positive bias that is applied to 
the transfer belt [C]. All four toners are put  on the belt at the same time. Then, the 
completed four-color image is moved to the  paper by a negative charge applied to the ITB 
drive roller [D] (the transfer roller [E] is an idle roller). 
1.  Drum charge:  The charge roller gives  the drum a negative charge 
2.  Laser exposure : The laser beam from the laser diode (LD) goes through the lens and 
mirrors and reaches the drum. The machine turns the laser beam on and off to make a 
latent image on the drum. 
3.  Development: The development roller carries negativ ely charged toner to the latent 
image on the drum surface. This machine  uses four independent development units 
(one for each color). 
4.  Transfer:  
Image transfer:  Bias rollers opposite the OPC drums  transfer toner from the drums to 
the transfer belt. Four toner images  are super-imposed onto the belt.   
Paper transfer : Then, the ITB drive roller pushes the  toner from the transfer belt to the 
paper (the transfer roller is an idle roller).    
						

							 
SM 6-7 B230/B237/D042 
Detailed 
Descriptions 
5.  Cleaning for OPC drum : The cleaning brush and blade remove remaining toner on 
the drum surface after image transfer to the paper. 
6.  Quenching for OPC drum:  Quenching is done by illuminat ing the whole area of the 
drum with the laser at the end of every job. 
7.  Cleaning and quenching for transfer belt:  The cleaning brush and blade clean the 
belt surface. The grounding roller inside t he transfer belt unit removes the remaining 
charge on the belt. 
 
8.  ID sensors: The ID sensors detect the  density of ID sensor patterns on the transfer 
belt.  
The ID sensor board contains three ID sens ors for the line position adjustment (front, 
center, and rear) and four ID sensors for the process control. On this board, there are 7 
ID sensors in total, as follows.   
ƒ  [A]: Line position  adjustment (front) 
ƒ  [B] Process control (K) 
ƒ  [C]: Process control (C) 
ƒ  [D]: Line position adjustment (centre) 
ƒ  [E] Process control (M) 
ƒ  [F]: Process control (Y) 
ƒ  [G]: Line position adjustment (rear) 
The ID sensor output is used for the following: 
ƒ  Process control and for automatic line position 
ƒ Skew correction 
ƒ  Color registration adjustm ents for the latent image.  
						

							 
B230/B237/D042 6-8 SM 
6.2 PROCESS CONTROL 
6.2.1 OVERVIEW 
This machine has the following two forms of process control: 
ƒ Potential control 
ƒ  Toner supply control 
The following machine components are used for process control: 
ƒ  Four ID (image density) sensors  (black, magenta, cyan and yellow).   
ƒ TD sensor. 
Normally, process control is not disabled. If  process control is disabled, fixed supply mode 
is used for toner supply, and the  VREF stored in SP 3222 is used. 
6.2.2 POTENTIAL CONTROL 
Overview 
The machine determines VD using the ID  sensor output, and then determines VB and VL. 
ƒ V
D: Drum potential without exposure – to adj ust this, the machine adjusts the charge 
roller voltage. 
ƒ V
B: Development bias 
ƒ V
L: Drum potential at the strongest exposure –  to adjust this, the machine adjusts the 
laser power 
At the same time, the machine also determi nes VREF: Reference TD sensor output, used 
for toner supply control 
If potential control is disabled ( SP3-041-001 is set to 0), V
D and VB are fixed by the 
following SP mode settings. 
ƒ  SP2-005 for V
D, SP2-229 for VB  
If LD power control is disabled (SP3-041-002 is  set to 0), the LD power is fixed by the 
following SP mode setting. 
ƒ  SP2-221 for V
L  
Process Control Self Check 
This machine uses the process control self  check method to do the potential control. The 
machine uses seven types of  process control self check. These are categorized according 
to their execution timing. 
The counter (SP3-510) is reset if a self-c heck is done (except for a forced self-check). 
ΔT = Temperature change between the temperat ure of the previous process control and 
the current temperature  
						

							 
SM 6-9 B230/B237/D042 
Detailed 
Descriptions 
ΔRH = RH (Relative Humidity) change between the  relative humidity of the previous 
process control and the current relative humidity 
ΔAH = AH (Absolute Humidity) change between  the absolute humidity of the previous 
process control and the cu rrent absolute humidity 
1.  Manual execution (forced): This is done when SP3-011-1 is used. 
2. Initial  This starts automatically when the power is  turned on, or, when the machine recovers 
from energy saver mode.   
This is done automatically if  one of these conditions occurs. 
ƒ a)  ΔT is greater than or equal to Tem perature Threshold (SP3-522-003: 10° C) 
ƒ b)  ΔRH is greater than or equal to Relative  Humidity Threshold (SP3-522-004: 
50%RH) 
ƒ c)  ΔAH is greater than or equal to Absolute  Humidity Threshold (SP3-522-005: 6 
g/m
3) 
ƒ  d) If the following conditions both occur. 
BW Counter (SP3-510-003) is greater than or equal to Execution Interval 
(SP3-511-005)  
OR 
FC Counter (SP3-510-004) is greater than or equal to Execution Interval 
(SP3-511-006) 
Non-use Time is greater than or  equal to SP3522-002 (default: 6 hours) 
3.  Interval: Job End  This starts automatically at the end of a  print job if the following condition occurs: 
BW Counter (SP3-510-001) is greater than or equal to Execution Interval 
(SP3-515-001)  
OR 
FC Counter (SP3-510-002) is greater than or equal to Execution Interval 
(SP3-515-002) 
4.  Interval: During a Job    This interrupts printing and then starts autom atically if the following condition occurs: 
BW Counter (SP3-510-001) is greater than or equal to Execution Interval 
(SP3-515-003)  
OR  
FC Counter (SP3-510-002) is greater than or equal to Execution Interval 
(SP3-515-004) 
After process control is completed, t he machine continues to make prints.  
						

							 
B230/B237/D042 6-10 SM 
5.  In standby mode   
This is done automatically if one  of these conditions occurs.   
ƒ a)  ΔT is greater than or equal to Tem perature Threshold (SP3-531-002: 10° C) 
ƒ b)  ΔRH is greater than or equal to Relative  Humidity Threshold (SP3-531-003: 
50%RH) 
ƒ c)  ΔAH is greater than or equal to Absolute  Humidity Threshold (SP3-531-004: 6 
g/m3) 
ƒ  d) Non-use Time is greater than or equal to SP3-531-001 (default: 6 hours) 
It is not done if the machine is in energy saver mode. 
The default non-use time is  6 hours (see condition 4 below), so normally it will only be 
done if the user disables energy saver mode. 
6.  After Toner End Recovery  This starts after recovery from a toner end condition. 
7.  After Developer Initialization  Developer initialization occurs automat ically in the following conditions: 
ƒ  After a new development unit has been installed 
ƒ  After new developer is installed and 3902-005 to 008 is done, depending on the  color (see ‘Maintenance’ for details). 
6.2.3 PROCESS CONTROL  SELF CHECK PROCEDURE 
 
Step 1: VSG Adjustment  
This machine uses four ID sensors (direct re flection type) for the process control. Each