Ricoh Mp C3000 Service Manual

							Basic Operation 
SM 17 B789 
B789 
ARDF DF3000 
2.2 BASIC OPERATION 
2.2.1  ORIGINAL SET AND SIZE DETECTION 
 
The original set sensor [A] detects if the orig inal is set or not. The original sensor [B] 
detects if the original is on the original tray  or not (this lets the machine know as early as 
possible, whether there is another original on the tray). 
The original size detection mechani sm consists of the four original width sensors ([F]: Width 
Sensor S, [G]: Width Sensor M, [H] Width Sensor  L, [I]: Width Sensor LL) and three original 
length sensors ([C]: Length Sensor S, [D]: Lengt h Sensor M, [E]: Length Sensor L). Based 
on the combined output of the length sensors and the width  sensors, the machine can 
detect the size of the original. This integrat ed detection mechanism is detailed in the table 
below. 
Width Sensor Length Sensor  Area 
Size 
S  M  L  LL  S  M  L  LT A/B
A3/SEF (297 x 420)  ON ON ON ON ON ON ON O  O 
B4/SEF (257 x 364)  ON  ON  -  -  ON  ON  ON  -  O 
A4/SEF (210 x 297)  ON  -  -  -  ON  ON  -  O  O 
A4/LEF (297 x 210)  ON  ON  ON  ON  -  -  -  O  O 
B5/SEF (182 x 257)  -  -  -  -  ON  -  -  -  O 
B5/LEF (257 x 182)   ON  ON  -  -  -  -  -  -  O 
A5/SEF (148 x 210)  - - - - - - - - O 
A5/LEF (210 x 148)   ON  -  -  -  -  -  -  -  O 
11 x 17/SEF (DLT)  ON  ON  ON  -  ON  ON  ON  O1 O5  
						

							Basic Operation 
B789 18  SM 
11 x 15/SEF ON ON ON  -  ON ON ON 1 - 
10 x 14/SEF  
ON  ON  -  -  ON  ON  ON  O  - 
8.5 x 14/SEF (LG)  ON  -  -  -  ON  ON  ON  O2 - 
8.5 x 13/SEF (F4)  ON  -  -  -  ON  ON  ON 2 O 
8.25 x 13/SEF  
ON        ON  ON  ON  -  - 
8 x 13/SEF (F) ON  -  -  -  ON  ON  ON  -  - 
8.5 x 11/SEF (LT)  ON  -  -  -  ON  -  -  O3 O6 
8.5 x 11/LEF (LT)  ON  ON  ON  -  -  -  -  O4 O7 
7.25 x 10.5/SEF (US 
EXE)  ON -  -  - ON -  - O - 
10.5 x 7.25/SEF (US 
EXE) ON ON ON  -  -  -  - 4 
- 
10 x 8/SEF  
ON  -  -  -  ON  -  - 3 - 
5.5 x 8.5/SEF (HLT)  - - - - - - - O - 
5.5 x 8.5/LEF (HLT)  ON - - - - - - O - 
267 mm x 390 mm  ON  ON  ON  -  ON  ON  ON  - 5 
195 mm x 267 mm  ON  -  -  -  ON  -  -  - 6 
267 mm x 195 mm  ON  ON  ON  -  -  -  -  - 7 
 
Symbol
 
O: Yes (Default), 
: Yes (Can select this with SP  mode), ON: Paper present, LT: North 
America, A/B:  Europe, Asia 
 
ƒ For O/
 mark, which has superscripted numbe r, it is possible to change the 
original detection size with SP6-016. For example, instead of LT (O
3), the machine 
can be set up to detect 10” x 8” (
3). 
ƒ  The F size can be selected with SP5-126. The default is 8.5 x 13 
ƒ  The machine cannot detect more than one si ze of original in the same job. 
2.2.2  MIXED ORIGINAL SIZE MODE 
This section explains what happens when the user selects mixed original size mode. 
Because this ARDF is a sheet-through document feeder, the  method for original document 
width detection is the same as when the orig inals are the same size, but the document 
length detection method is diff erent. Therefore, the scanning  speed is slightly slower.  
						

							Basic Operation 
SM 19 B789 
B789 
ARDF DF3000 
Document length detection 
From when the skew correction sens or switches on until it switches off, the CPU counts the 
transport motor pulses. The number of pulse s 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 is scanned. 
 
Auto Reduce/Enlarge 
Centering 
Erase Center/Border 
Booklet 
Image Repeat 
 
The originals follow this path: 
1. Length detection 
 Scanning glass  Inverter table 
2. Inverter table 
 Scanning glass  Inverter table (restores the original order) 
3. Inverter table 
 Scanning glass (image scanned)  Exit tray 
Normal feed-in 
In a copy mode other than those listed abov e, when the reduction/enlargement ratio has 
been determined, the originals are scanned normally. In order to store the scanned images, 
a large area of memory (the detected original  width x 432 mm length) is prepared. Next, 
only the portion of the image up to the detected original lengt h is read from memory and 
printed.  
						

							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 sol enoid 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 from feed belt [C], the topmost  sheet is separated from the stack by the 
separation roller [D] and sent to the skew correction roller. 
The mechanism is an FRR system , consisting of the original feed belt [C] and separation 
roller [D].   
						

							Basic Operation 
SM 21 B789 
B789 
ARDF DF3000 
2.2.4 SKEW CORRECTION 
 
When an original is fed into t he feeder, the feed motor [B] rotate s forwards. At this time, the 
feed belt turns but the skew correction rolle r [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 origin al turns on the skew correction sensor [A], 
the feed motor [B] turns off for 40 ms and ro tates in reverse. At this time, the skew 
correction roller [C] and the feed belt both  turn, and original feed continues. 
The original is fed by the skew correction ro ller after the feed clutch [D] has turned off.  
						

							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, t he feed and transport motors f eed the original through the 
scanning area at a lower speed (t he scanning area contains the original exposure guide [B] 
and DF exposure glass [C]). After scanning, the or iginal is fed out by the transport roller [D] 
and exit roller [E]. 
Double-Sided Originals 
 
After skew correction, the feed and transport mo tors drive the skew correction roller [A], 
registration roller [B], transport roller [C] and the  exit roller [D]. The front side of the original 
is then scanned. 
When the original exit sensor  detects the leading edge of the original, the junction gate 
solenoid is activated and the  junction gate [E] opens. The original is then transported  
						

							Basic Operation 
SM 23 B789 
B789 
ARDF DF3000 
towards the inverter table.  
Soon after the trailing edge of the original pa sses 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 reve rse. 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 original is then sent to the inverter table again to be turned over. This is done so that 
the duplex copies will be properly stacked front si de down in the exit tray [G] in the correct 
order. 
Original Sensor 
During one-to-one copying, copy paper is fed  to the skew correction roller in advance (while 
the original is still being scanned), to increase t he copy speed. The original sensor monitors 
the stack of originals in the  feeder, and detects when the tr ailing edge of the last page has 
been fed in. The main CPU then st ops the copier from feeding an unwanted extra sheet of 
copy paper. 
2.2.6  CONDITIONS FOR JAM DETECTION 
Jam Mode   Detection Timing 
When turning on the machine, the ske w correction sensor, registration 
sensor or exit sensor detects an original. 
When the cover is closed or DF is  down, the skew correction sensor, 
registration sensor or exit sensor detects an original. Initial 
When the cover is opened or DF is  lifted up, the skew correction 
sensor, registration sensor or ex it sensor detects an original.  
						

							Basic Operation 
B789 24  SM 
The skew correction sensor does not turn off even if the original was 
fed by the maximum length of t he 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 r egistration 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 ex it sensor turned on. 
The skew correction sensor does not  turn on even if the original was 
fed by transport path length x 1.5. 
The registration sensor does not turn on even if the original was fed by 
transport path length x 1.5 after t he skew correction sensor turned on. Sensor does 
not come on 
The exit sensor does not turn on ev en the original was fed by transport 
path length x 1.5 after the skew correction sensor turned on. 
  
						

							Dip Switches 
SM 25 B789 
B789 
ARDF DF3000 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 mode: 32% speed 
0  1  1  1  Free run: With original: One-sided mode: 70% speed 
1  0  0  0  Free run: With original: Two-sided mode: 70% speed 
1  0  0  1  Free run: With original: One-sided mode: 200% speed 
1  0  1  0  Free run: With original: Two-sided mode: 200% speed 
1  0  1  1  Transport Motor On 
1  1  0  0  Feed Motor On 
1  1  0  1  Transport Motor On with random mode 
1  1  1  0  Feed Motor On with random mode 
1 1  1  1