Ricoh Mp C3000 Service Manual

							 
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