Ricoh B230 Service Manual

 
SM 6-3 B230/B237 
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 transfer belt unit, and inside the toner 
collection bottle. Also rotates the toner bottles. 
5....

 
B230/B237 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....

 
SM 6-5 B230/B237 
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:...

 
B230/B237 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. Each 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....

 
SM 6-7 B230/B237 
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 illuminating 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 the transfer belt unit removes the remaining 
charge on the belt. 
 
8....

 
B230/B237 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...

 
SM 6-9 B230/B237 
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 current 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....

 
B230/B237 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 Temperature 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...

 
SM 6-11 B230/B237 
Detailed 
Descriptions 
sensor detects a pattern for each color (see the ‘Printing Process’ section).   
The ID sensor checks the bare transfer belt’s reflectivity. Then the machine calibrates the 
ID sensor until its output when reading the bare transfer belt (known as VSG) is as follows. 
ƒ  VSG = 4.0 ± 0.5 Volts 
This calibration compensates for the transfer belt’s condition and the ID sensor condition. 
For example, dirt on the surface of the belt or ID sensor. 
VSG adjustment is...

 
B230/B237 6-12  SM 
Step 4: Toner Amount Calculation 
The machine calculates the amount of toner on the transfer belt that is required to make 
each of the 10 grades of the sensor pattern. To do this, the machine uses the output values 
of the ID sensor from each grade of the pattern. 
The amounts of toner are expressed as M/A (mass per unit area, mg/cm
2) 
Step 5: V
D, VB, VL Selection and VTREF Adjustment 
The machine determines the relationship between the amount of toner on the transfer belt 
and...