Ricoh B230 Service Manual

							 
SM 6-53 B230/B237 
Detailed 
Descriptions 
paper transfer unit keeps away from the image transfer belt.  
						

							 
B230/B237 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 
Detailed 
Descriptions 
6.10.2  DRIVE – TRAY 1, TRAY 2, AND BY-PASS TRAY 
 
The paper feed motor [A] drives the pick-up and feed mechanisms in tray 1 [B], tray 2 [C]. It 
uses clutches and complex trains 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] for 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 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 bottom 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 machine, the connection between the coupling gear 
and lift arm shaft is disengaged, and the tray bottom plate lowers.  
						

							 
SM 6-57 B230/B237 
Detailed 
Descriptions 
6.10.4  PAPER SIZE DETECTION – TRAYS 1 & 2 
 
There is no size switch for tray 1. The paper size 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 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 LEF or A4 LEF, depending on the setting of 
SP5-181-2. 
ƒ  *4: The machine detects either Exe LEF 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 DETECTION – 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 
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 DETECTION – 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 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 
  
						

							 
SM 6-61 B230/B237 
Detailed 
Descriptions 
6.10.9 TRAY LOCK MECHANISM 
This machine has two types of tray lock mechanism. 
Tray Lock at the Front 
 
The lock at the front prevents the tray from coming out of the machine during transporting 
or shipping. When you pull the handle [A], the lock lever [B] is lowered. As a result, you can 
pull out the tray. 
Tray Lock at the Rear 
 
This mechanism is only activated when the machine detects a paper jam. The lock at the 
rear prevents the tray from coming out from the machine when the paper is jammed. If the 
tray is removed while the paper is jammed, the paper may be split in two pieces. This 
makes it difficult to remove the jammed paper. 
If the paper is jammed, the tray lock solenoid [A] turns on and activates the lock lever [B].  
						

							 
B230/B237 6-62  SM 
The lock lever [B] locks tray 1 [C] and tray 2 [D].   
6.10.10 PAPER  DUST  COLLECTION 
 
The two mylars [A] scrape the paper dust from the registration idle roller [B]. The paper 
dust falls down into the paper dust container [C]. 
6.10.11 BY-PASS PAPER SEPARATION 
 
When the paper set sensor detects paper and the machine gets a by-pass printing job, the 
by-pass solenoid [A] unlocks the feed shaft stopper at the front end of the by-pass feed 
shaft [B].   
The by-pass feed shaft has the by-pass feed roller [C] and two cams [D]. These cams 
move the paper lift plate [E] up and down. This pushes the paper against the feed roller. 
To feed the paper, the by pass feed roller makes one turn. After this, the rollers inside the 
machine can feed the paper, and the solenoid locks the shaft again.