Ricoh B230 Service Manual

Basic Operation 
SM 19 B789 
B789 
Document length detection 
From when the skew correction sensor switches on until it switches off, the CPU counts 
the transport motor pulses. The number of pulses determines the length of the original. 
Feed-in cycle 
When the original size for the copy modes listed below cannot be determined, the image 
cannot be correctly scaled (reduced or enlarged) or processed until the original’s length 
has been accurately detected. The length must be determined before the image...

Basic Operation 
B789 20  SM 
2.2.3 PICK-UP AND SEPARATION 
 
The original is set with the image facing up. The original pushes actuator and the original 
set sensor is activated. 
After pressing the start button, the feed clutch is activated and the original feed unit [A] 
moves down. At the same time, the pick-up solenoid is activated and the original table lifts 
until the original comes in contact with the pick-up roller [B]. The pick-up roller then feeds 
the top sheet of paper.  
After being fed...

Basic Operation 
SM 21 B789 
B789 
2.2.4 SKEW CORRECTION 
 
When an original is fed into the feeder, the feed motor [B] rotates forwards. At this time, 
the feed belt turns but the skew correction roller [C] does not. Because of this, when the 
leading edge of the paper gets to the skew correction roller, skew in the original is 
removed. 
A short time after the leading edge of the original turns on the skew correction sensor [A], 
the feed motor [B] turns off for 40 ms and rotates in reverse. At this...

Basic Operation 
B789 22  SM 
2.2.5  ORIGINAL TRANSPORT AND EXIT 
Single-Sided Originals 
 
The feed motor feeds the separated original to the skew correction roller [A] at maximum 
speed. After skew correction, the feed and transport motors feed the original through the 
scanning area at a lower speed (the scanning area contains the original exposure guide 
[B] and DF exposure glass [C]). After scanning, the original is fed out by the transport 
roller [D] and exit roller [E]. 
Double-Sided Originals...

Basic Operation 
SM 23 B789 
B789 
towards the inverter table.  
Soon after the trailing edge of the original passes the exit sensor, the junction gate 
solenoid switches off and the junction gate [E] is closed. When the original has been fed 
onto the inverter table, the feed motor switches on in reverse. The original is then fed by 
the inverter roller [F], and then by the skew correction roller [A] and registration roller [B] to 
the scanning area (where the reverse side will be scanned). 
 
The...

Basic Operation 
B789 24  SM 
The skew correction sensor does not turn off even if the original was 
fed by the maximum length of the original + 150 mm after the skew 
correction sensor turned on. 
The registration sensor does not turn off even if the original was fed by 
its length x 1.5 after the registration sensor turned on. Sensor stays 
on too long 
The exit sensor does not turn off even if the original was fed by its 
length x 1.5 after the exit sensor turned on. 
The skew correction sensor does...

Dip Switches 
SM 25 B789 
B789 3. SERVICE TABLES 
3.1 DIP SWITCHES 
 
DIP-SW 
1 2 3 4 Function 
0  0  0  0  Normal operating mode (Default) 
0  0  0  1  Free run: With original: One-sided mode: 100% speed 
0  0  1  0  Free run: With original: Two-sided mode: 100% speed 
0  0  1  1  Free run: No original: One-sided mode: 100% speed 
0  1  0  0  Free run: No original: Two-sided mode: 100% speed 
0  1  0  1  Free run: With original: One-sided mode: 32% speed 
0  1  1  0  Free run: With original: Two-sided...

 
 
 
 
1 BIN TRAY 
B790