Ricoh B230 Service Manual
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![Page 826
B230/B237 6-28 SM
outputs (SP2-193-004: [default: 200 pages)
4. Color counter > Output threshold for color outputs (SP2-193-005: [default: 200 pages])
Interval: Job end:
This starts automatically at the end of a print job.
Line position adjustment is automatically done once if one of these conditions occurs:
1. Δt > Time threshold (SP2-193-009: [default: 300 minutes])
2. ΔT > Temperature threshold (SP2-193-008: [default: 5°C])
3. B/W counter (SP3-510-005) + Color counter (SP3-510-006) >...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-825.png "Page 826
B230/B237 6-28 SM
outputs (SP2-193-004: [default: 200 pages)
4. Color counter > Output threshold for color outputs (SP2-193-005: [default: 200 pages])
Interval: Job end:
This starts automatically at the end of a print job.
Line position adjustment is automatically done once if one of these conditions occurs:
1. Δt > Time threshold (SP2-193-009: [default: 300 minutes])
2. ΔT > Temperature threshold (SP2-193-008: [default: 5°C])
3. B/W counter (SP3-510-005) + Color counter (SP3-510-006) >...")
![Page 827
SM 6-29 B230/B237
Detailed
Descriptions
Main Scan Skew Adjustment
The WTL positioning motors for magenta [A], cyan [B], and yellow [C] adjust the angle of
the WTL [D] respectively, based on the WTL position for black. This mechanism corrects
main scan skew.
ID Sensors
There are seven ID sensors. Three of them are for the line position adjustment. Four of
them are for process control. The ID sensor shutter [A] covers the sensors when the
machine is idle.
When the ID sensor shutter...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-826.png "Page 827
SM 6-29 B230/B237
Detailed
Descriptions
Main Scan Skew Adjustment
The WTL positioning motors for magenta [A], cyan [B], and yellow [C] adjust the angle of
the WTL [D] respectively, based on the WTL position for black. This mechanism corrects
main scan skew.
ID Sensors
There are seven ID sensors. Three of them are for the line position adjustment. Four of
them are for process control. The ID sensor shutter [A] covers the sensors when the
machine is idle.
When the ID sensor shutter...")
![Page 828
B230/B237 6-30 SM
Shutter Mechanism
The laser optics housing unit has a shutter. As a result, toner and other dust do not fall on
the glass of the laser optics housing. The shutter motor [A] moves the shutter [B] in the
direction of the arrow with the cam [C] (to open: black arrow direction, to close: white arrow
direction).
First, the actuator [D] stays at the shutter closed sensor [E]. The shutter motor opens the
shutter and the actuator moves to the shutter open sensor position [F] after...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-827.png "Page 828
B230/B237 6-30 SM
Shutter Mechanism
The laser optics housing unit has a shutter. As a result, toner and other dust do not fall on
the glass of the laser optics housing. The shutter motor [A] moves the shutter [B] in the
direction of the arrow with the cam [C] (to open: black arrow direction, to close: white arrow
direction).
First, the actuator [D] stays at the shutter closed sensor [E]. The shutter motor opens the
shutter and the actuator moves to the shutter open sensor position [F] after...")
![Page 830
B230/B237 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 drum 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. This 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...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-829.png "Page 830
B230/B237 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 drum 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. This 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...")
![Page 831
SM 6-33 B230/B237
Detailed
Descriptions
Drum Charge and Quenching
This machine uses a non-contact charge roller [A] to reduce ozone. The non-contact
charge roller gives the drum surface a negative charge. The high voltage supply board –
C.B, which is located at the rear of the machine, applies a dc and ac voltage (at a constant
current) to the roller. The ac voltage helps to ensure that the charge given to the drum is as
uniform as possible.
The machine automatically controls the charge...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-830.png "Page 831
SM 6-33 B230/B237
Detailed
Descriptions
Drum Charge and Quenching
This machine uses a non-contact charge roller [A] to reduce ozone. The non-contact
charge roller gives the drum surface a negative charge. The high voltage supply board –
C.B, which is located at the rear of the machine, applies a dc and ac voltage (at a constant
current) to the roller. The ac voltage helps to ensure that the charge given to the drum is as
uniform as possible.
The machine automatically controls the charge...")
![Page 832
B230/B237 6-34 SM
Drum Cleaning
The cleaning blade [A] scrapes off the used toner 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 roller [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 value of SP 3517, the drum reverses briefly at the end of the
job to prevent the blade from...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-831.png "Page 832
B230/B237 6-34 SM
Drum Cleaning
The cleaning blade [A] scrapes off the used toner 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 roller [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 value of SP 3517, the drum reverses briefly at the end of the
job to prevent the blade from...")
![Page 833
SM 6-35 B230/B237
Detailed
Descriptions
6.6.3 DEVELOPMENT
Development Operation
This machine uses a dual-component 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 attracted onto the surface of its roller.
The TD sensor [C] in the development unit and four ID sensors above the ITB...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-832.png "Page 833
SM 6-35 B230/B237
Detailed
Descriptions
6.6.3 DEVELOPMENT
Development Operation
This machine uses a dual-component 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 attracted onto the surface of its roller.
The TD sensor [C] in the development unit and four ID sensors above the ITB...")
![Page 834
B230/B237 6-36 SM
Drive
The drum/development drive motor-K [A] drives 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 developer forward and backward to agitate the
developer.
This happens at the following times:
ƒ During process control self check
ƒ During toner supply](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-833.png "Page 834
B230/B237 6-36 SM
Drive
The drum/development drive motor-K [A] drives 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 developer forward and backward to agitate the
developer.
This happens at the following times:
ƒ During process control self check
ƒ During toner supply")
![Page 835
SM 6-37 B230/B237
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 toner 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 development unit can become solid at temperatures
higher than this value. A developer initialization error shows if the...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-834.png "Page 835
SM 6-37 B230/B237
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 toner 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 development unit can become solid at temperatures
higher than this value. A developer initialization error shows if the...")
SM 6-33 B230/B237 Detailed Descriptions Drum Charge and Quenching This machine uses a non-contact charge roller [A] to reduce ozone. The non-contact charge roller gives the drum surface a negative charge. The high voltage supply board – C.B, which is located at the rear of the machine, applies a dc and ac voltage (at a constant current) to the roller. The ac voltage helps to ensure that the charge given to the drum is as uniform as possible. The machine automatically controls the charge roller voltage if automatic process control is enabled (i.e., if SP3-041-1 is set to CONTROL). However, if process control is switched off, (i.e., if SP3-041-1 is set to FIXED), the dc voltage is the value stored in SP2-001-1 to -12 (do not adjust in the field unless advised to do so). The diameter of the charge roller is 12.5 mm (circumference about 39.3 mm). The gap between a drum and the corresponding charge roller is about 50 μm. The cleaning roller [B], which always contacts the charge roller, cleans the charge roller. Quenching is done by illuminating the whole area of the drum with the laser at the end of every job.
B230/B237 6-34 SM Drum Cleaning The cleaning blade [A] scrapes off the used toner 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 roller [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 value of SP 3517, the drum reverses briefly at the end of the job to prevent the blade from flipping over. The brush roller rubs against the lubricant bar [D] and lubricates the drum surface. Lubricant is uniformly applied on the surface of the drum by the lubricant application blade [E]. The toner collection auger [B] in each PCU is driven by gears [F] at the end of the drum. This toner then goes to the toner collection bottle (see section Toner Collection Path and Drive in this section).
SM 6-35 B230/B237 Detailed Descriptions 6.6.3 DEVELOPMENT Development Operation This machine uses a dual-component 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 attracted onto the surface of its roller. The TD sensor [C] in the development unit and four ID sensors above the ITB control toner density. Each development unit has a TD sensor. The TD sensor contains an ID chip in which some information about the development unit is stored. The diameter of the development roller is 18 mm (circumference about 56.5 mm).
B230/B237 6-36 SM Drive The drum/development drive motor-K [A] drives 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 developer forward and backward to agitate the developer. This happens at the following times: ƒ During process control self check ƒ During toner supply
SM 6-37 B230/B237 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 toner 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 development unit can become solid at temperatures higher than this value. A developer initialization error shows if the toner does become solid. At this time, you must do the following procedure: ƒ You should also do this procedure when you install a new development unit. 1. Remove the (old) development unit. 2. Keep the (new) development unit level and shake it several times from side to side. 3. Install it in the machine. Development Bias The PSU supplies development bias to the development roller via the receptacle at the rear of each development unit. There is a dc bias voltage. The machine automatically controls the dc bias if the automatic process control is enabled (i.e., if SP3-041-001 is set to 1: ON). However, if process control is switched off, (i.e., if SP3-041-001 is set to 0: OFF), the dc bias is the value stored in SP3-621-001 to -012 (do not adjust in the field unless advised to do so). New Unit Detection The TD sensor [A] in the development unit has an ID chip that contains the new unit detection flag. The machine detects that a PCU is new if the flag in the ID chip is activated.
B230/B237 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 color) 3. Toner end sensor (each color) 4. Toner attraction pump (each color) 5. Development unit (each color) 6. TD sensor (each color) This machine uses four toner bottles. Each bottle has a spiral groove in it and its groove moves toner to the toner attraction pump. And the toner attraction pump transports the
SM 6-39 B230/B237 Detailed Descriptions toner to the development unit. The toner end sensor is attached to the toner supply tube. The toner end sensor and the output from the process control define 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. Each bottle has a spiral groove, and this groove moves toner to the mouth [B] of the bottle. Here, toner spills into a hopper [C]. The opening [D] of the toner hopper is normally closed if the toner bottle is not installed in the machine. When the toner bottle is installed in the machine, the transport tube [E] pushes the toner hopper shutter [F] and then the opening of the toner hopper is open. The toner passes part of the way along the transport tube towards the toner attraction pump. The toner goes through the toner end sensor [G]. Toner Near End Detection The toner end sensors [G] detect toner near end conditions ( Toner Near End/Toner End Detection in this section).
B230/B237 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 in from the cartridge and passes it to the development unit. When supplying toner, the clutch turns on and off as many times as necessary to supply the necessary amount of toner. The amount of toner depends on the results of toner supply control. Shutter Mechanism The development unit and toner attraction pump each have a shutter mechanism. The shutter [F] on the pump opens when the development unit is placed in the machine. At the same time, the pump opens the shutter [G] in the development unit. When both shutters are open, toner can enter the development unit from the toner attraction pump. The shutter springs pull and close the shutter when the development unit is removed.
SM 6-41 B230/B237 Detailed Descriptions 6.7.3 TONER CARTRIDGE RFID (Radio Frequency ID) Each toner cartridge of this machine has a RFID chip [A]. This stores the total “on” time of the toner supply clutch. This is used to calculate the amount of toner remaining in the toner cartridge. The chip is also used to detect whether the cartridge is installed (if the cartridge is not installed, the machine does not detect a signal from the memory chip). The RFID transmits its data to the RFID antenna board [B] without any contact.
B230/B237 6-42 SM 6.8 WASTE TONER COLLECTION 6.8.1 TONER COLLECTION PATH AND DRIVE From PCU The used toner from the collection augers in the four PCUs drops into the toner collection duct from the four openings [A][B][C][D] at the front of the PCUs. The toner collection auger [E] in the duct transports this used toner towards the toner collection bottle [F]. The coil [E] is driven by the toner transport motor [G]. The openings and PCUs correspond as follows: Yellow [A], Cyan [B], Magenta [C], Black [D].