Ricoh Mp C3000 Service Manual
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![Page 866
B230/B237/D042 6-46 SM
ITB (Image Transfer Belt) Drive
Drive Motor
The ITB drive motor [A] drives the image transfer belt [B] and the cleaning unit via gears
and the ITB drive roller [C]. The speed of ITB drive depends on the process line speed (see
‘Laser Exposure – Optical Path’).
Transfer belt speed control
This machine uses the rotation encoder to control the transfer belt speed.
The encoder [A] is on one of the rollers. This encoder checks the rotation speed of the
image...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-865.png "Page 866
B230/B237/D042 6-46 SM
ITB (Image Transfer Belt) Drive
Drive Motor
The ITB drive motor [A] drives the image transfer belt [B] and the cleaning unit via gears
and the ITB drive roller [C]. The speed of ITB drive depends on the process line speed (see
‘Laser Exposure – Optical Path’).
Transfer belt speed control
This machine uses the rotation encoder to control the transfer belt speed.
The encoder [A] is on one of the rollers. This encoder checks the rotation speed of the
image...")
![Page 867
SM 6-47 B230/B237/D042
Detailed
Descriptions
Filter H:
The number of notches read by the sensor when the rotation speed of the transfer belt is at
its highest possible value.
Filter L:
The number of notches read by the sensor when the rotation speed of the transfer belt is at
its lowest possible value.
ITB Current
Each image transfer roller [A] applies current to the image transfer belt to attract the toner
from each drum [B]. The hi gh voltage supply board supplies current to the...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-866.png "Page 867
SM 6-47 B230/B237/D042
Detailed
Descriptions
Filter H:
The number of notches read by the sensor when the rotation speed of the transfer belt is at
its highest possible value.
Filter L:
The number of notches read by the sensor when the rotation speed of the transfer belt is at
its lowest possible value.
ITB Current
Each image transfer roller [A] applies current to the image transfer belt to attract the toner
from each drum [B]. The hi gh voltage supply board supplies current to the...")
![Page 868
B230/B237/D042 6-48 SM
Transfer belt cleaning
The ITB-cleaning unit removes toner (during printing) and the ID sensor patterns (during
process control or automatic line positi on adjustment) on the belt. Belt cleaning is
completed while the image transfer belt makes one rotation. The ITB drive motor drives the
ITB-cleaning unit.
The cleaning brush [A] always contacts the image transfer belt [B], and removes used toner
from the belt. The cleaning blade [C] in the cleaning unit scrapes the...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-867.png "Page 868
B230/B237/D042 6-48 SM
Transfer belt cleaning
The ITB-cleaning unit removes toner (during printing) and the ID sensor patterns (during
process control or automatic line positi on adjustment) on the belt. Belt cleaning is
completed while the image transfer belt makes one rotation. The ITB drive motor drives the
ITB-cleaning unit.
The cleaning brush [A] always contacts the image transfer belt [B], and removes used toner
from the belt. The cleaning blade [C] in the cleaning unit scrapes the...")
![Page 870
B230/B237/D042 6-50 SM
1. Remove the Image Transfer Belt Contact Motor [A] (
sec. 3.10.8).
2. Using needle nose pliers, turn the Transfer Belt Contact Motor Shaft [B] until the flat
surface of the shaft is facing up .
3. Open the front cover of the machine and ens ure the Transfer Belt is away from the
OPC units before removing.
4. To reinstall the Transfer Belt Contact Mo tor, first turn the shaft [B] until the flat
surface is facing down .
5. Reinstall the Transfer...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-869.png "Page 870
B230/B237/D042 6-50 SM
1. Remove the Image Transfer Belt Contact Motor [A] (
sec. 3.10.8).
2. Using needle nose pliers, turn the Transfer Belt Contact Motor Shaft [B] until the flat
surface of the shaft is facing up .
3. Open the front cover of the machine and ens ure the Transfer Belt is away from the
OPC units before removing.
4. To reinstall the Transfer Belt Contact Mo tor, first turn the shaft [B] until the flat
surface is facing down .
5. Reinstall the Transfer...")
![Page 872
B230/B237/D042 6-52 SM
The toner is moved from the OPC [A] onto the surface of the image transfer belt [B] by a
positive charge from the image transfer rolle r (immediately above the drum, not shown
here). The ITB drive roller [C], which is giv en a negative charge, pushes the toner to the
paper [D].
The paper transfer roller [E] presses the paper against the image transfer belt [B] (with a
spring that is under tension from the paper transfer roller contact motor), and grounds the
charge...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-871.png "Page 872
B230/B237/D042 6-52 SM
The toner is moved from the OPC [A] onto the surface of the image transfer belt [B] by a
positive charge from the image transfer rolle r (immediately above the drum, not shown
here). The ITB drive roller [C], which is giv en a negative charge, pushes the toner to the
paper [D].
The paper transfer roller [E] presses the paper against the image transfer belt [B] (with a
spring that is under tension from the paper transfer roller contact motor), and grounds the
charge...")
![Page 875
SM 6-55 B230/B237/D042
Detailed
Descriptions
6.10.2 DRIVE – TRAY 1, TR AY 2, AND BY-PASS TRAY
The paper feed motor [A] drives the pick-up and f eed mechanisms in tray 1 [B], tray 2 [C]. It
uses clutches and complex tr ains of gears to do this.
When tray 1 and tray 2 are inside the machine, their pick-up rollers [E][F] are always in
contact with each top sheet of the paper stack (see section ). However, the feed roller [G] of
the by-pass tray [D] stays away until the by-pass pick-up...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-874.png "Page 875
SM 6-55 B230/B237/D042
Detailed
Descriptions
6.10.2 DRIVE – TRAY 1, TR AY 2, AND BY-PASS TRAY
The paper feed motor [A] drives the pick-up and f eed mechanisms in tray 1 [B], tray 2 [C]. It
uses clutches and complex tr ains of gears to do this.
When tray 1 and tray 2 are inside the machine, their pick-up rollers [E][F] are always in
contact with each top sheet of the paper stack (see section ). However, the feed roller [G] of
the by-pass tray [D] stays away until the by-pass pick-up...")
![Page 876
B230/B237/D042 6-56 SM
6.10.3 PAPER LIFT – TRAYS 1 & 2
When the tray is installed in the machine, the tray bar [A] pushes the lever [B], and this
lever pushes down the pick-up roller [C] onto the paper.
Also, the rear end of the paper tray pushes the tray set switch; see section (for tray 2, this
is the paper size switch). As a result, the machine detects that the paper tray is installed.
When the machine detects that a tray has been placed in the machine, the tray lift motor
[D]...](http://img.usermanuals.tech/thumb/64/98663/w64_mp-c3000-service-manual-1509271621_d-875.png "Page 876
B230/B237/D042 6-56 SM
6.10.3 PAPER LIFT – TRAYS 1 & 2
When the tray is installed in the machine, the tray bar [A] pushes the lever [B], and this
lever pushes down the pick-up roller [C] onto the paper.
Also, the rear end of the paper tray pushes the tray set switch; see section (for tray 2, this
is the paper size switch). As a result, the machine detects that the paper tray is installed.
When the machine detects that a tray has been placed in the machine, the tray lift motor
[D]...")
SM 6-51 B230/B237/D042 Detailed Descriptions 6.9.2 PAPER TRANSFER AND SEPARATION Overview 1. Paper transfer roller 2. Discharge plate 3. ITB drive roller 4. Image transfer roller 5. Image transfer belt 6. OPC drum The paper transfer unit consists of the paper tr ansfer roller and discharge plate. This unit completes the toner transfer to the paper. PTR (Paper Transfer Roller) Drive ƒ P.P.: Power Pack
B230/B237/D042 6-52 SM The toner is moved from the OPC [A] onto the surface of the image transfer belt [B] by a positive charge from the image transfer rolle r (immediately above the drum, not shown here). The ITB drive roller [C], which is giv en a negative charge, pushes the toner to the paper [D]. The paper transfer roller [E] presses the paper against the image transfer belt [B] (with a spring that is under tension from the paper transfer roller contact motor), and grounds the charge from the ITB drive roller [C]. (The p aper transfer roller does not have a drive mechanism. This roller is driven by the image transfer belt.) Finally, the discharge plate [E], which is given an AC charge, discharges the paper. The discharge plate receives its charge from a different high voltage power supply board than the ITB drive roller. PTR (Paper Transfer Roller) Contact and Separation The paper transfer contact motor [A] keeps the paper transfer roller [B] in contact with the image transfer belt [C]. This motor has the paper transfer HP sensor [D] inside. The paper transfer HP sensor detects if the paper transfe r roller is in contact with the image transfer belt. Only when the machine executes the line position adjustment or process control, the
SM 6-53 B230/B237/D042 Detailed Descriptions paper transfer unit keeps away from the image transfer belt.
B230/B237/D042 6-54 SM 6.10 PAPER FEED 6.10.1 OVERVIEW 1. Pick-up roller - tray 1 2. Separation roller - tray 1 3. Feed roller - tray 1 4. Registration roller 5. Transport roller - By-pass feed 6. Feed roller - By-pass feed 7. By-pass feed table 8. Friction pad - By-pass feed 9. Vertical transport roller 1 10. Vertical transport roller 2 11. Feed roller - tray 2 12. Separation roller - tray 2 13. Paper tray 2 14. Pick-up roller - tray 2 15. Paper tray 1 There are two paper trays (500 sheets each), and a by-pass feed table (100 sheets). The paper feed mechanism uses an FRR system for tray 1 and 2, and uses a friction pad system for the by-pass tray. Tray 1 can hold A4 or letter paper only. Tray 2 can hold a range of sizes.
SM 6-55 B230/B237/D042 Detailed Descriptions 6.10.2 DRIVE – TRAY 1, TR AY 2, AND BY-PASS TRAY The paper feed motor [A] drives the pick-up and f eed mechanisms in tray 1 [B], tray 2 [C]. It uses clutches and complex tr ains of gears to do this. When tray 1 and tray 2 are inside the machine, their pick-up rollers [E][F] are always in contact with each top sheet of the paper stack (see section ). However, the feed roller [G] of the by-pass tray [D] stays away until the by-pass pick-up solenoid [H] turns on (see section ). When the paper feed clutch [I] fo r tray 1 turns on, the pick-up, feed [J] and separation [K] rollers start rotating to feed the paper. The paper from tray 2 is also fed in the same way. For the paper from the by-pass tray [D], the duplex/by-pass motor drives the feed roller to feed the paper. The paper feed clutch stays on until shortly after the registration sensor activates.
B230/B237/D042 6-56 SM 6.10.3 PAPER LIFT – TRAYS 1 & 2 When the tray is installed in the machine, the tray bar [A] pushes the lever [B], and this lever pushes down the pick-up roller [C] onto the paper. Also, the rear end of the paper tray pushes the tray set switch; see section (for tray 2, this is the paper size switch). As a result, the machine detects that the paper tray is installed. When the machine detects that a tray has been placed in the machine, the tray lift motor [D] rotates and the coupling gear [E] on the tray lift motor engages the pin [F] on the lift arm shaft [G]. Then the tray lift arm lifts the tray bo ttom plate [H] until the paper lift sensor [I] for the tray detects that the top of the stack is at the paper feed position. When the tray is removed from the machi ne, the connection between the coupling gear and lift arm shaft is disengaged, and the tray bottom plate lowers.
SM 6-57 B230/B237/D042 Detailed Descriptions 6.10.4 PAPER SIZE DETECTION – TRAYS 1 & 2 There is no size switch for tray 1. The paper si ze is fixed at either A4 or LT (LEF for both sizes). You can change the size setting with SP5-181-1. For tray 2, there are four paper size switches [A] working in combination. Switch 1 (right end) is for tray set detection. The other three switches detect the paper size as shown in the table below. The actuator [B] is moved by the end plate [C]. 0: Not pushed, 1: Pushed Models Switch Location North America Europe/Asia SW4 SW3 SW2 DLT (A3) SEF*1 A3 (DLT) SEF*1 1 1 0 LG (B4) SEF*2 B4 (LG) SEF*2 1 1 1 A4 SEF A4 SEF 0 0 1 B5 SEF B5 SEF 0 0 0 LT (A4) LEF*3 A4 (LT) LEF*3 0 1 1 B5 (Exe) LEF*4 B5 (Exe) LEF*4 1 0 1 A5 LEF A5 LEF 0 1 0 ƒ *1: The machine detects either DLT SEF or A3 SEF, depending on the setting of SP5-181-3.
B230/B237/D042 6-58 SM ƒ *2: The machine detects either LG SEF or B4 SEF, depending on the setting of SP5-181-4. ƒ *3: The machine detects either LT LE F or A4 LEF, depending on the setting of SP5-181-2. ƒ *4: The machine detects either Exe LE F or B5 LEF, depending on the setting of SP5-181-5 ƒ SP 5-181-6 to –13 does similar functions for the optional paper trays. The machine disables paper feed from a tray if the paper size cannot be detected (if the paper size actuator is broken or no tray is installed). For non-standard paper sizes, if they are not visible on the user tool screen for selecting paper sizes, then set SP 5112 to 1. If the user selects one of these sizes, auto paper size selection is disabled. 6.10.5 PAPER HEIGHT DE TECTION – TRAYS 1 & 2 Two paper height sensors [A] [B] and actuator [C] are built into the paper tray lift motor. The paper height sensors, detect the amount of paper in the tray. The actuator [C] has two semicircles, and it is engaged with the lift arm shaft via gears. The paper height sensors detect the paper size depending on the position of the two semicircles. The list shown below shows the detection combination of the two sensors. The paper remaining status bar is displayed in the tray selection icon on the LCD. Remaining paper Paper height sensor 1 [A] Paper height sensor 2 [B]
SM 6-59 B230/B237/D042 Detailed Descriptions 100% (Status bar x 4) OFF OFF 70% (Status bar x 3) ON OFF 30% (Status bar x 2) ON ON 10% (Status bar x 1) OFF ON OFF: No actuator 6.10.6 PAPER END DETE CTION – TRAYS 1 & 2 The paper stack raises the paper end feeler [A] and the paper end sensor [B] deactivates if there is some paper in the paper tray. When the paper tray runs out of paper, the paper end feeler [A] drops into the cutout in the tray bottom plate. At this time the paper end sensor [B] activates.
B230/B237/D042 6-60 SM 6.10.7 REGISTRATION The registration motor [A] drives the registration roller [B] with a complex train of gears. The machine makes a paper buckle at the registration roller to correct paper skew. You can adjust the paper buckle with SP1-003. 6.10.8 PAPER FEED LINE SPEED This machine has two process line speeds (for feed from registration roller to fusing unit). The line speeds depend on the selected mode. Mode Line speed (mm/s) Print speed (ppm) Plain/ Middle Thick 138 C1a: 25 C1b: 30 OHP/Thick 77 16