Ricoh B230 Service Manual
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![Page 812
B230/B237 6-14 SM
6.2.6 TONER NEAR END/TONER END DETECTION
Toner Near End
The controller considers the following information to determine the toner near end status:
ƒ Operation time counter of the toner attraction pump [A]
ƒ Pixel counter
These values are both stored in the memory chip [B] on the toner cartridge, and copied
from the memory chip to the NVRAM on the BICU.
If either value indicates that the amount of remaining toner is 50g or less, the machine
enters the near-end...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-811.png "Page 812
B230/B237 6-14 SM
6.2.6 TONER NEAR END/TONER END DETECTION
Toner Near End
The controller considers the following information to determine the toner near end status:
ƒ Operation time counter of the toner attraction pump [A]
ƒ Pixel counter
These values are both stored in the memory chip [B] on the toner cartridge, and copied
from the memory chip to the NVRAM on the BICU.
If either value indicates that the amount of remaining toner is 50g or less, the machine
enters the near-end...")
![Page 815
SM 6-17 B230/B237
Detailed
Descriptions
6.3.2 SCANNER DRIVE
The scanner motor [A] drives the 1st scanner [B] and the 2nd scanner [C] through the
scanner drive pulley, scanner drive shaft [D], and two scanner wires [E].
Book mode -
The SBU board controls the scanner drive motor. The 2nd scanner speed is half that of the
1st scanner.
In reduction or enlargement mode, the scanning speed depends on the magnification ratio.
The returning speed is always the same, whether in full size or...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-814.png "Page 815
SM 6-17 B230/B237
Detailed
Descriptions
6.3.2 SCANNER DRIVE
The scanner motor [A] drives the 1st scanner [B] and the 2nd scanner [C] through the
scanner drive pulley, scanner drive shaft [D], and two scanner wires [E].
Book mode -
The SBU board controls the scanner drive motor. The 2nd scanner speed is half that of the
1st scanner.
In reduction or enlargement mode, the scanning speed depends on the magnification ratio.
The returning speed is always the same, whether in full size or...")
![Page 816
B230/B237 6-18 SM
6.3.3 ORIGINAL SIZE DETECTION
ƒ The original width sensors [A] detect the original width. The original length sensors [B]
detect the original length.
ƒ The SBU controller on the SBU board checks each sensor status when the platen
cover sensor [C] is activated as it is closed. It detects the original size by the on/off
signals it gets from each sensor.
ƒ If the copy is made with the platen cover fully open, the SBU controller on the SBU
determines the original size from...](http://img.usermanuals.tech/thumb/64/100811/w64_b230-service-manual-1509630901_d-815.png "Page 816
B230/B237 6-18 SM
6.3.3 ORIGINAL SIZE DETECTION
ƒ The original width sensors [A] detect the original width. The original length sensors [B]
detect the original length.
ƒ The SBU controller on the SBU board checks each sensor status when the platen
cover sensor [C] is activated as it is closed. It detects the original size by the on/off
signals it gets from each sensor.
ƒ If the copy is made with the platen cover fully open, the SBU controller on the SBU
determines the original size from...")
SM 6-13 B230/B237 Detailed Descriptions 6.2.5 TONER SUPPLY CONTROL Overview Toner supply control determines how long the toner supply clutch turns on. This determines the amount of toner supplied. This is done before every development for each color. Toner supply control uses the following factors: ƒ Density of the toner in the develo per (detected by the TD sensor) - V REF, VT ƒ Pixel count: Determines how much toner was used for the page The image density is kept constant by adjusting the density of toner in the development unit. At the same time, it accommodates changes in the development conditions through the potential control mechanism. Environmental changes and the number of prints made are also used in the calculation. The amount of toner supplied is determined by the ‘on’ time of the toner supply clutch. The total ‘on’ time for each toner supply clutch is stored in the memory chip for the relevant toner cartridge. The amount of toner supplied also depends on the process line speed for the current job. The machine supplies the calculated amount of toner for each color. Toner Supply Control Modes This machine has three toner supply control modes. You can select them with SP3-044-1 to -4. 1. Fixed supply mode This mode is used when the TD sensor becomes faulty. You can adjust the amount of toner supply with SP3-401-1 to -4 if the im age density is incorrect (the default setting is 5%). 2. PID (Proportional Integral Diff erential) control mode (Fixed V TREF) This mode is used when the ID sensor becomes faulty. Only the TD sensor is used to control toner supply. The mach ine uses the VTREF that is stored in SP3-222-1 to -4. 3. Fuzzy control mode This is the default toner supply control mode. The TD sensor, ID sensor, and pixel count are used in this mode. V TREF is adjusted by process control. ⇒ Rev. 09/2006
B230/B237 6-14 SM 6.2.6 TONER NEAR END/TONER END DETECTION Toner Near End The controller considers the following information to determine the toner near end status: ƒ Operation time counter of the toner attraction pump [A] ƒ Pixel counter These values are both stored in the memory chip [B] on the toner cartridge, and copied from the memory chip to the NVRAM on the BICU. If either value indicates that the amount of remaining toner is 50g or less, the machine enters the near-end condition. Toner End To determine the toner end status, the machine uses the TD sensor [C] in the development unit. The machine must first be in a toner near-end condition, or toner end cannot be detected. Toner end is detected if both the following conditions occurs: ƒ V T – VTREF greater than or equal to 0.5 (SP3-101-021) ƒ SUM (V T – VTREF) greater than or equal to 10 (SP3-101-026) The machine cannot print until the toner cartridge is replaced after it detects toner end for black. The machine can print in black and white only if cyan, magenta, or yellow are in a toner end condition during standby mode. At this time the machine cannot do color print jobs. ƒ If the yellow, cyan, or magenta toner ends during a color-printing job, the job is suspended until toner is supplied. If new color toner is not installed, the user can
SM 6-15 B230/B237 Detailed Descriptions print black-and-white jobs only. Toner End Recovery The machine assumes that the toner cartridge has been replaced if either of the following occurs when the near-end or end status exists: ƒ The front door is opened and closed. ƒ The main switch is turned off and on. Then the machine starts to supply toner to the development unit. After supplying toner, the machine clears the toner near-end or end status if the following condition is detected: ƒ Toner end sensor detects that toner is supplied. The machine tries to supply toner for a maximum of 5 times (SP 3-102). 6.2.7 DEVELOPER INITIALIZATION When is it done? When you install new developer, you must set the following SPs to 1 before you turn the power off. Then, the machine will reset the PM counters automatically. Developer initialization will also be done automatically. ƒ Black: SP3902-005 ƒ Yellow: SP3902-006 ƒ Cyan: SP3902-007 ƒ Magenta: SP3902-008 When a new development unit or PCU is installed, the machine detects the new unit automatically and initializes the developer. How is it done? The procedure is as follows. 1. The machine agitates the developer for 30 seconds. 2. The machine adjusts V CNT (control voltage for TD sensor) so that VT (TD sensor output) becomes within 2.7 ± 0.2. 3. The machine keeps this as V TREF if it is successful. SC372 to SC375 is displayed if it fails sequentially 3 times. The result of developer initialization can be checked with SP3-014. VCNT is corrected for the total number of prints. This does not let the developer Q/M vary. During developer initialization, the machine forcibly supplies toner because there is no toner inside the toner transport tube at installation. Then the machine does the process control self check.
B230/B237 6-16 SM 6.3 SCANNING 6.3.1 OVERVIEW 1. Scanner HP sensor 2. ADF exposure glass 3. 2nd scanner (2nd carriage) 4. Scanner lamp 5. 1st scanner (1st carriage) 6. Exposure glass 7. Scanner motor 8. Sensor board unit (SBU) 9. Lens Block 10. Original length sensor 11. Original width sensor The original on the exposure glass or ARDF exposure glass reflects the light emitted from the scanner lamp. The reflected light goes to the CCD on the sensor board by way of the 1st and 2nd scanners. The sensor board converts the CCD analog signals into digital signals. When the original is manually placed on the exposure glass, the scanner motor pulls the 1st and 2nd scanners via mechanical linkage. The original is scanned from left to right. When the original is fed from the optional ARDF, it is automatically transported onto the ARDF exposure glass, and to the original exit. The original does not stay on the glass; but goes to the exit. The 1st and 2nd scanners stay at their home positions.
SM 6-17 B230/B237 Detailed Descriptions 6.3.2 SCANNER DRIVE The scanner motor [A] drives the 1st scanner [B] and the 2nd scanner [C] through the scanner drive pulley, scanner drive shaft [D], and two scanner wires [E]. Book mode - The SBU board controls the scanner drive motor. The 2nd scanner speed is half that of the 1st scanner. In reduction or enlargement mode, the scanning speed depends on the magnification ratio. The returning speed is always the same, whether in full size or magnification mode. The image length change in the sub scan direction is done by changing the scanner motor speed. In the main scan direction it is done by image processing on the BICU board. You can adjust the magnification in the sub-scan direction by changing the scanner motor speed with SP4-008. ARDF mode - The scanners always stay in their home position (the scanner HP sensor [F] detects the 1st scanner) to scan the original. The ARDF motor feeds the original through the ARDF. In reduction/enlargement mode, the image length change in the sub-scan direction is done by changing the ARDF motor speed. Magnification in the main scan direction is done in the BICU board. This is the same as for book mode. You can adjust magnification in the sub-scan direction by changing the ARDF motor speed with SP6-017.
B230/B237 6-18 SM 6.3.3 ORIGINAL SIZE DETECTION ƒ The original width sensors [A] detect the original width. The original length sensors [B] detect the original length. ƒ The SBU controller on the SBU board checks each sensor status when the platen cover sensor [C] is activated as it is closed. It detects the original size by the on/off signals it gets from each sensor. ƒ If the copy is made with the platen cover fully open, the SBU controller on the SBU determines the original size from the sensor outputs after the Start key is pressed. Original Size Length Sensor Width Sensor Metric version Inch version L3 L2 L1 W1 W2 SP4-301 display A3 11 x 17 O O O O O 00011111 B4 10 x 14 O O O O X 00011110
SM 6-19 B230/B237 Detailed Descriptions F4 8.5 x 13, 8.25 x 13, or 8 x 13 SP 5126 controls the size that is detected 8.5” x 14” O O O X X 00011100 A4 LEF 8.5 x 11 X X X O O 00000011 B5 LEF - X X X O X 00000010 A4 SEF 11 x 8.5 X O O X X 00001100 B5 SEF - X X O X X 00000100 A5 LEF/ SEF 5.5 x 8.5, 8.5 x 5.5 X X X X X 00000000 ƒ O: Paper present, X: Paper not present The above table shows the outputs of the sensors for each original size. This original size detection method eliminates the necessity for a pre-scan and increases the machine’s productivity. However, if the by-pass tray is used, the machine assumes that the copy paper is lengthwise (L). For example, if A4 sideways paper is placed on the by-pass tray, the machine assumes it is A3 paper and scans a full A3 area. Information from the original size sensors is disregarded. Refer to the ARDF manual for more information on original size detection with the ARDF. 6.3.4 ANTI-CONDENSATION HEATER The anti-condensation heater is available as an optional unit. The anti-condensation heater prevents condensation on the mirrors. Condensation can occur when the scanner unit is, for example, moved from a cold room to a warm room. Condensation can cause abnormal images.
B230/B237 6-20 SM 6.4 IMAGE PROCESSING 6.4.1 OVERVIEW 6.4.2 SBU (SENSOR BOARD UNIT) SBU The VPU (Video Processor Unit) does the following functions: ƒ Black level correction ƒ White level correction ƒ Gradation calibration ƒ ADS control (Background Density) ƒ Creating the SBU test pattern Operation Summary The signals from the 3-line CCD, one line for each color (R, G, B) and 2 analog signals per line (ODD, EVEN), are sampled by the ASIC and converted to digital signals in the 10-bit A/D converter. This is the first phase of processing the data scanned from the original. Storing Operation Settings The controller stores the SBU settings. These values must be restored after the lens block is replaced:
SM 6-21 B230/B237 Detailed Descriptions SP4-008-001 Sub Scan Mag Sub Scan Magnification Adjustment SP4-010-001 Sub Scan Reg Sub Scan Registration Adjustment SP4-011-001 Main Scan Reg Main Scan Registration Adjustment Also, before lens block replacement, enter the SP mode and note the settings of SP4-800-001 to -003 (ARDF density adjustments for R, G, B). After lens block replacement, do some copy samples with the ARDF, then check the copies. If the copies have background, change SP4-800-001 to -003 to their previous settings, or adjust until the background is acceptable. These SP codes are also used to adjust the ARDF scanning density, if the scanning densities of the ARDF and the platen mode are not the same. SBU Test Mode There are two SP codes to create a test pattern which can be used as a diagnostic tool to troubleshoot problems in the SBU: ƒ SP4907 001 SBU Pattern - Test Pattern ƒ SP4907 002 SBU Pattern - Select Fixed Pattern To print the pattern: ƒ Select the pattern to print. ƒ Touch Copy Window then press the Start key twice. 6.4.3 IPU (IMAGE PROCESSING UNIT) The IPU does the following: ƒ Controls the scanner ƒ Processes the image signals from the SBU and sends them over the PCI bus to the controller memory ƒ Receives the image processing signals sent over the PCI bus from the controller memory, processes them, then outputs them to the VGAVD. ƒ Outputs the control signals for the ARDF ƒ Controls the relay of power and signals Image processing, ADS correction, and line width correction are done on the BICU board for all the digital data sent from the SBU. Finally, the processed data is sent to the printer as digital signals (4 bits/pixel).
B230/B237 6-22 SM 6.5 LASER EXPOSURE 6.5.1 OVERVIEW 1. Synchronizing detector board: Y/C-E 2. LD unit-Y 3. LD unit-C 4. LD unit-Bk 5. LD unit-M 6. Synchronizing detector board: Bk/M-S 7. F-theta lens-Bk/M 8. WTL-Bk 9. WTL-M 10. Synchronizing detector board: Bk/M-E 11. Polygon mirror motor 12. Synchronizing detector board: Y/C-S 13. WTL-C 14 WTL-Y 15. F-theta lens-Y/C This machine uses four LD units and one polygon mirror motor to produce latent images on four OPC drums (one drum for each color toner). There are two hexagonal mirrors. Each mirror reflects beams from two LD units. Laser exposure for black and magenta starts from the rear side of the drum. But for yellow and cyan it starts from the front side of the drum. This is because the units for black and magenta are on the other side of the polygon mirror from the units for yellow and cyan.