Toshiba MR-2012 User manual

AUTOMATIC DOCUMENT FEEDER
MR-2012
File No.31100013

General Precautions for Installation/Servicing/Maintenance for the MR-2012
The installation and service should be done by a qualified service technician.
1. When installing the MR-2012 to the Plain Paper Copier, be sure to follow the instructions described in
the “Unpacking/Set-Up Procedure for the MR-2012” booklet which comes with each unit of the
MR-2012.
2. The MR-2012 should be installed by an authorized/qualified person.
3. Before starting installation, servicing or maintenance work, be sure to turn off and unplug the copier
first.
4. When servcing or maintaining the MR-2012, be careful about the rotating or operation sections such
as gear, pulleys, sprockets, cams, belts, etc.
5. When parts are disassembled, reassembly is basically the reverse of disassembly unless otherwise
noted in this manual or other related materials. Be careful not to reassemble small parts such as
screws, washers, pins, E-rings, toothed washers to the wrong places.
6. Basically, the machine should not be operated with any parts removed or disassembled.
7. Delicate parts for preventing safety hazard problems (such as breakers, thermofuses, fuses, door
switches, sensors, etc.if any) should be handled/installed/adjusted correctly.
8. Use suitable measuring instruments and tools.
9. During servicing or maintenance work, be sure to check the serial No.plate and other cautionary
labels (if any) to see if they are clean and firmly fixed.If not, take appropriate actions.
10. The PC board must be stored in an anti-electrostatic bag and handled carefully using a wristband,
because the ICs on it may be damaged due to static electricity.Before using the wrist band, pull out
the power cord plug of the copier and make sure that there is no uninsulated charged objects in the
vicinity.
11. For the recovery and disposal of used MR-2012, consumable parts and packing materials, it is
recommended that the relevant local regulations/rules should be followed.
12. After completing installation, servicing and maintenance of the MR-2012, return the MR-2012 to its
original state, and check operation.
Copyright 2000
TOSHIBA TEC CORPORATION

October 2000 © TOSHIBA TEC 1 MR-2012 CONTENTS
CONTENTS
1. SPECIFICATIONS ...................................................................................................... 1-1
2. OUTLINE .................................................................................................................... 2-1
2.1 Names ofVarious Components......................................................................................... 2-1
2.2 Layout of Electrical Parts.................................................................................................. 2-2
2.3 Harness Connection Diagram............................................................................................ 2-4
2.4 Board Assembly ............................................................................................................... 2-5
3. OPERATIONAL DESCRIPTION ................................................................................. 3-1
3.1 GeneralOperation ............................................................................................................. 3-1
3.2 Block Diagram .................................................................................................................. 3-1
3.3 Detection of Abnormal Status ........................................................................................... 3-2
3.3.1 Cover open/Close detection ................................................................................... 3-2
3.3.2 Feeder jam detection ............................................................................................. 3-2
3.3.3 ADF registration sensor stay jam detection............................................................ 3-2
3.3.4 ADF read sensor unreached jam detection ............................................................ 3-2
3.3.5 ADF read sensor stay jam detection ...................................................................... 3-2
3.3.6 ADF exit sensor unreached jam detection.............................................................. 3-2
3.4 FlowChart ........................................................................................................................ 3-3
4. MECHANICAL DESCRIPTION.................................................................................. 4-1
4.1 Paper Feed System .......................................................................................................... 4-1
4.2 Document Size Detection Method..................................................................................... 4-2
4.3 Drive System .................................................................................................................... 4-4
5. CIRCUIT DESCRIPTION ........................................................................................... 5-1
5.1 PWA Block Diagram ......................................................................................................... 5-1
5.2 Detection Circuit ............................................................................................................... 5-1
5.3 ADF Read Sensor Input Circuit ......................................................................................... 5-2
5.4 ADF Motor Drive Circuit .................................................................................................... 5-3
5.5 Meaning of Signals ........................................................................................................... 5-4
5.6 Timing Chart ..................................................................................................................... 5-5
6. DISASSEMBLY AND REPLACEMENT..................................................................... 6-1

October 2000 © TOSHIBA TEC 1 - 1 MR-2012 SPECIFICATIONS
1. SPECIFICATIONS
Function : Auto document feeder
No.of originals loaded : Max.50 originals (A4, 60 to 80g/m2)
Document size : A5-R (Min.) to A3 (Max.)
Dimensions : 530 (W) x 450 (D) x 120 (H) mm
Weight : Approx. 5.4 kg
Power supply : 5V, 24V (Supplied from copier)

October 2000 © TOSHIBA TEC 2 - 1 MR-2012 OUTLINE
2. OUTLINE
2.1 Names of Various Components
Connection Cable
ADF 02-01-01
ADF top cover
Document guide R
Document tray
Document guide F

MR-2012 OUTLINE 2 - 2 October 2000 © TOSHIBA TEC
2.2 Layout of Electrical Parts
VR1
SW1
SEN1
SEN5
SEN4
SEN6
SEN3
SEN2
ADF 02-02-01
M1
ADF PWA
ADF 02-02-02

October 2000 © TOSHIBA TEC 2 - 3 MR-2012 OUTLINE
Symbols and functions of various devices
Name
ADFCOV-SW
ADF top cover open switch
WIDTH-VR
Document width sensor
ADFOPN-SEN
ADF open sensor
SIZE-SEN
Document length sensor
EMPTY-SEN
Document empty sensor
REGST-SEN
ADF registration sensor
POS-SEN
ADF read sensor
HAISI-SEN
ADF exit sensor
ADF PWA
ADF-MOT
ADF motor
Function
Detects the open/close state of the top cover
during jamming processing, etc.
Detects the width of document.
Detects the open/close state of the ADF unit.
Detects the length of document.
Detects the loading of document.
Detects the aligning position of document.
Detects the document scanning start position.
Detects the ejection of document.
PWA which relays the sensor signals and motor
drive signals.
Drives the roller to transport originals.
Symbol
SW1
VR1
SEN1
SEN2
SEN3
SEN4
SEN5
SEN6
ADF
M1

MR-2012 OUTLINE 2 - 4 October 2000 © TOSHIBA TEC
2.3 Harness Connection Diagram
Scanner control PWA
CN6
SIZE2/DF-REQ
HAISI/DF-ACK 21
22
RADF CNT
ADF CNT/REQ 23
24
NC FG FG
SG 25
26
+24V
+24V 1
2
/A
A3
4
/B
B5
6
PG
PG 7
8
D/A
+5V 9
10
REGST/ACK
POS 11
12
5VPS
VALID/DFFAN 13
14
DF OPN
EMPTY 15
16
SG
COVER/RXD 17
18
SG
WIDTH/TXD 19
20
ADF PWA
21
22
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NC NC
NC
NC
NC
CN1
SG
HAI+5V
HAISI
1
2
3
ADF
top cover open switch
ADF exit sensor
3
2
1
N.C.
N.O.
COM
CN11
CN10
CN9
CN6
CN12
POS
+5V
D/A
4
5
6
ADF read sensor
3
2
1
SG
REG+5V
REGST
7
8
9
ADF registration
sensor
3
2
1
SG
EMP+5V
EMPTY
10
11
12
Document empty sensor
3
2
1
SG
OPN+5V
DF_OPN
13
14
15
ADF open sensor
3
2
1
CN12
Document length sensor
3
2
1
+24V
MOT+24V
COVER
CN2
CN4
1
2
3
WIDTH
WIDTH+5V
SIZE+5V
SG
SG
CN5
1
2
3
4
5
SIZE 6
Document
width
sensor
MOT+24V
MOT+24V NC
NC
NC
NC
NC
/A
A
B
CN3
1
2
3
4
5
1
2
3
4
5
/B 6
6
7
8
9
10
11
ADF motor
ADF
ADF 02-03-01

October 2000 © TOSHIBA TEC 2 - 5 MR-2012 OUTLINE
2.4 Board Assembly
ADF 02-04-01

October 2000 © TOSHIBA TEC 3 - 1 MR-2012 OPERATIONAL DESCRIPTION
3. OPERATIONAL DESCRIPTION
3.1 General Operation
The ADF is an auto document feed unit capable of accommodating a maximum of 50 originals. The
originals loaded are fed and scanned one by one and stacked on the exit tray. The ADF has a mechanical
section for document transport, sensors to detect the position of document, etc., and a motor for transport.
It also has one PWA where comparator IC’s only are installed and the other signals simply pass. For this
reason, all control and processing are performed by the scanner PWA.
3.2 Block Diagram
ADF 03-02-01
ADF
PWA
ADF
CN6 CN1
Scanner
PWA
ADF read sensor
ADF open cover sensor
Document length sensor
Document width sensor
ADF top cover open switch
CN4CN5
ADF registration sensor
Document empty sensor
ADF exit sensor
ADF motorM
CN2CN3

MR-2012 OPERATIONAL DESCRIPTION 3 - 2 October 2000 © TOSHIBA TEC
3.3 Detection of Abnormal Status
3.3.1 Cover open/Close detection
When the ADF top cover is opened, the contact of the ADF top cover open switch changes to cut the
supply of 24V to the motor and sends a cover open detection signal to the scanner PWA.
3.3.2 Feeder jam detection
The number of pulses (time) equivalent to the distance ( ) from the document set position to the ADF
registration sensor ON position plus 300 mm is regarded as timing for detecting a jam. When the time from
the moment of starting paper feed to the moment when the ADF registration sensor is turned ON exceeds
that value, a jam in the feeder will be detected.
3.3.3 ADF registration sensor stay jam detection
The number of pulses (time) equivalent to the distance obtained by subtracting 115 mm ( + ) from the
document length plus 30 mm (1115 mm for long mode) is regarded as timing for detecting a jam. When the
time from the moment when the ADF exit sensor is turned ON to the moment when the ADF registration
sensor is turned OFF exceeds that value, a ADF registration sensor stay jam will be detected.
3.3.4 ADF read sensor unreached jam detection
The number of pulses (time) equivalent to the distance ( ) from the ADF registration sensor to the ADF
read sensor plus 30 mm is regarded as timing for detecting a jam. When the time from the moment of
starting the transport of the document having reached the ADF registration sensor to the moment when the
ADF read sensor is turned ON exceeds that value, an ADF read sensor unreached jam will be detected.
3.3.5 ADF read sensor stay jam detection
The number of pulses (time) equivalent to the distance ( ) from the ADF registration sensor to the ADF
read sensor plus 30 mm is regarded as timing for detecting a jam. When the time taken after the end of the
document passes the ADF registration sensor exceeds that value, an ADF read sensor stay jam will be
detected.
3.3.6 ADF exit sensor unreached jam detection
The number of pulses (time) equivalent to the distance ( ) from the moment when the ADF read sensor is
turned ON to the moment when the exit sensor is turned ON plus 35 mm is regarded as timing for detecting
a jam. When the time taken after the top of the document passes the ADF read sensor exceeds that value,
an ADF exit sensor unreached jam will be detected.
ADF registration sensor
ADF read sensor ADF exit sensor
Document empty sensor
adf 03-03-06

October 2000 © TOSHIBA TEC 3 - 3 MR-2012 OPERATIONAL DESCRIPTION
3.4 Flow Chart
Start button ON
End
Document feed from ADF
YES
Scanning of
final document
Scanning of document
Cassette feed
Copy
Ejection
NO

October 2000 © TOSHIBA TEC 4 - 1 MR-2012 MECHANICAL DESCRIPTION
4. MECHANICAL DESCRIPTION
4.1 Paper Feed System
Transport of Document
When a document is placed in the tray, the document empty sensor detects the presence of a document.
When the Start button is pressed on the copier while in ADF mode, the ADF motor operates to lower the
pickup roller and pull in the document. Where there are more than one document, they are separated by the
separation pad under the feed roller and transported one by one.
The document driven by the feed roller is then transported by the read roller. There, the transport of the
document is detected by the ADF registration sensor. When the top of the paper reaches the ADF read
sensor, the scanner starts scanning. The scanned document passes over the ADF exit sensor as driven
by the read roller and then ejected.
ADF 04-01-01
ADF exit sensor
Feed roller
ADF registration sensor
Read roller
ADF read sensor
Flow of document
Document width sensor
Document empty sensor
Pickup roller
Document length sensor

MR-2012 MECHANICAL DESCRIPTION 4 - 2 October 2000 © TOSHIBA TEC
(*1:ON for a document length of 306 mm)
4.2 Document Size Detection Method
The size of document is found by detecting the document width by the document width sensor, and the
document length by the document length sensor. When documents of different sizes are placed in the tray,
this detection method allows the maximum size of the documents to be detected. The document size is
detected according to the timing with which the document empty sensor is turned ON, the timing with
which the document width sensor changes, and the timing with which the document length sensor changes.
The detected size is sent to the copier.
When the ADF is on standby or the document empty sensor is ON, the document width sensor is checked
every 100 ms and the value obtained is compared with that of the last time. If the value is found changed
as a result of the comparison, the document size will be detected and sent to the copier when in ADF active
mode. When this unit receives a command accompanied by a document size notice request from the
copier, it will also detect and send the document size to the copier.
The detection results of the document size sensors are listed below. (Unit:mm)
A4 series
ADF as viewed from top
Document empty
sensor Document width
sensor
Document length
sensor
adf 04-02-01
Document width Document length sensor (*1)
OFF ON
129.40 -165.99 A5R (148 x 210)
166.00 -196.99 B5R (182 x 257)
197.00 -233.99 A4R (210 x 297) FOLIO (210 x 330)
234.00 -277.99 B5 (257 x 182) B4 (257 x 364)
278.00 -310.00 A4 (297 x 210) A4 (297 x 420)

October 2000 © TOSHIBA TEC 4 - 3 MR-2012 MECHANICAL DESCRIPTION
LT series
Document width Document length sensor (*1)
OFF ON
129.40 -177.99 STR (139.7 x 215.9)
178.00 -236.99 LTR (215.9 x 279.4) LG (215.9 x 355.6)
237.00 - 268.99 COMPUTER (257.2 x 356)
269.00 -310.00 LT (279.4 x 215.9) LD (279.4 x 431.8)
(*1:ON for a document length of 306 mm)

MR-2012 MECHANICAL DESCRIPTION 4 - 4 October 2000 © TOSHIBA TEC
4.3 Drive System
The driving force of the ADF motor is transmitted to each roller through the gears and belts. It is transmit-
ted to the feed rollers through the timing belt and gears (3 pcs.) and further transmitted to the pickup roller
through the timing belt. The driving force is transmitted to the read roller through the two timing belts and
the gears connecting them. The shaft part of the read roller is provided with a one-way clutch allowing the
driving force of the ADF motor to be transmitted only in the transport direction (counterclockwise) for
rotation.
DocumentFeed
The document is fed as the ADF motor turns clockwise as viewed from the front (in the direction of the
black arrow). When the ADF motor turns clockwise, the pickup roller lowers to pull in the document. At this
time, the read roller does not turn due to the function of the one-way clutch.
DocumentTransport
The document is transported as the ADF motor turns counterclockwise as viewed from the front (in the
direction of the white arrow). When the ADF motor turns counterclockwise, the pickup roller ascends
causing the spring clutch mounted on the feed roller shaft to slip so that the driving force is no longer
transmitted.
ADF 04-03-01
Pickup roller
One-way clutch
ADF motor
Rear side
Spring Clutch
Read roller
Front side
Feed roller

October 2000 © TOSHIBA TEC 5 - 1 MR-2012 CIRCUIT DESCRIPTION
5. CIRCUIT DESCRIPTION
5.1 PWA Block Diagram
5.2 Detection Circuit
The ADF top cover open switch detects the open or close state of the ADF top cover. 24V is supplied to
the motor when the cover is closed, and switches to the transistor Q1 side when open. The output of Q1
turns to “Low”level when the cover is open and the detection signal is sent to the scanner PWA from CN1.
The document width sensor uses a variable resistor for its detection element. It divides the voltage of 5V
through the variable resistor and sends the output to the scanner PWA. The scanner PWA A-D converts
the input voltage to calculate the document width.
The outputs of the ADF exit sensor, ADF registration sensor, ADF open sensor, and document length
sensor each are input to the IC1 comparator. The reference voltage obtained by dividing 5V though R2 and
R4 is input to the other input of the comparator. The detection level of each sensor is stabilized according
to this reference voltage value and output from the comparator. Since the document empty sensor does
not require accuracy for detecting the presence of a document, its output signal simply passes through the
ADF PWA.
ADF PWA
21
22
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
HAISI
1
2
3
ADF
top cover open switch
ADF exit sensor
4
5
6ADF read sensor
REG+5V 7
8
9ADF registration sensor
10
11
12 Document empty sensor
OPN+5V 13
14
15 ADF open sensor
Document length sensor
+24V
SG
MOT+24V
COVER
1
2
3
1
2
3
4
5
SIZE 6
Document
width
sensor
ADF motor
CN1
Relay PWA
1
2
3
4
5
6
CN3CN4CN5
Q1
CN2
P+5V
NC
SIZE
HAISI
WIDTH
COVER
DF-OPN
EMPTY
/B
REGST
B
/A
D/A
POS
A
+5V
+5V
+5V
+5V
P+5V
+24V
PG
SG
SG
SG
SG
R4
R2
IC1
8
9
6
7
1
-
+
14
-
+
10
11
13
-
+
4
5
2
-
+
ADF 05-01-01

MR-2012 CIRCUIT DESCRIPTION 5 - 2 October 2000 © TOSHIBA TEC
5.3 ADF Read Sensor Input Circuit
The ADF read sensor input circuit is installed on the scanner PWA. The ADF PWA only allows the signal
only to pass through. Therefore, this section describes the ADF read sensor input circuit on the scanner
PWA.
The ADF read sensor is a mirror reflective type sensor and consists of a pair of a infrared LED and a PTr
(phototransistor) each having an optical axis in the same direction. A mirror is provided on an extended line
of the optical axis of the sensor. When there is no document between the sensor and the mirror, an infrared
light emitted from the LED is reflected to PTr at high reflectance. When there is a document between them,
the emission to the mirror and the reflected light from the mirror are obstructed by the document so that the
reflected light incident on PTr becomes extremely low. When a quantity of light incident on PTr is large (no
document present), photoelectric current flowing through PTr increases and a drop in voltage due to R17
causes the voltage at pin 6 of IC8 to rise.
IC8 is a comparator which compares the reference voltage input to pin 5 (non-inverting input) with the signal
voltage at pin 6 (inverting input). When the voltage at pin 6 is higher, the output (pin 7 of IC8) turns to“Low”
level. Conversely, when a quantity of light incident on PTr is small (a document present), the voltage at pin
6 of IC8 becomes low and as a result pin 7 of IC8 turns to “High”level.
An automatic sensitivity adjusting function is also provided to control variations in sensor sensitivity.
When the sensor sensitivity adjust mode is selected, the automatic adjustment measures the output
voltage (analog value) of PTr at the A-D input terminal on the scanner side, changes the D-A output voltage
on the scanner side to make the PTr output voltage become the required voltage, and adjusts the LED
current through the voltage-current conversion circuit consisting of IC7, Q2, R20, etc.
+5V
R17
R18
POS_DA
REF_DA
IPOS
POS_AD
R22
R23
C16C17
C19
IC7
5
6
7Q2
+
-
IC7
3
2
1
+
-
IC8
5
6
7
+
-
R19
ADFScanner
ADF 05-03-01

October 2000 © TOSHIBA TEC 5 - 3 MR-2012 CIRCUIT DESCRIPTION
5.4 ADF Motor Drive Circuit
The ADF motor operates according to the driving signals from the scanner PWA. The signals only pass
through the ADF PWA. Therefore, this section describes the ADF motor drive circuit on the scanner PWA.
The ADF motor is driven by amplifying the pulse motor driving pattern signals output from the gate array
through the IC10 motor driver. These signals control the motor rotational direction and speed. The PWM
signal is input to APWM and converted to a certain voltage through the resistor and capacitor. The voltage
is input to IC10 (pins 3 and 14) to set the current value for the motor.
The current value for the motor can be set as desired by changing the duty of the PWM signal. AENB is a
signal to control the output of the motor driver. When the signal is at “High”level, the output of the driver
becomes effective.
IC1
Scanner MPU
IC4
Motor
control IC
IC10
Motor driver
+24V
ADF motor
A
/A
B
/B
CN6 CN1
CN2
CN3
APWM R8 R7 R6
SG PGSGSG
R5C6C7
CPUA0~19
CPUD0~15
75
AENB 72
ADTB 78
ADTA 77
ASTB 74
ACKO 76
17
6
2,13
5,16
A 13
1,2
/A 84
B 11 5
/B 18
R3,R4
9
R1,R2
10
6
3
1,2
4
5
6
3
1,2
21
5
9
11
+5V
2
5
1
Q1
3
14
Scanner control PWA
ADF PWA
ADF top cover open switch
ADF 05-04-01

MR-2012 CIRCUIT DESCRIPTION 5 - 4 October 2000 © TOSHIBA TEC
5.5 Meaning of Signals
The ADF top cover open switch detects the open or close state of the cover and uses a 2-circuit microswitch.
24V is supplied to the motor when the cover is closed, and cut when open.
The ADF open sensor detects the open/close state of the ADF unit. A photo sensor is used for the sensor.
The document length sensor detects the length of the document placed in the document tray. A photo
sensor is used for the sensor. It turns ON when the document length exceeds 306 mm.
The document width sensor detects the width of the document. A variable resistor is used for the sensor.
The resistive value changes as the document width guide is slid.
The ADF empty sensor detects the document placed in the document tray. A photo sensor is used for the
sensor.
The ADF registration sensor detects the document position in the transport path. A photo sensor is used
for the sensor. It detects a paper jam in combination with other sensors.
The ADF read sensor detects the document scanning start position. A mirror reflective type photo sensor
is used for the sensor. It detects the presence or absence of a document according to the strength of
reflected light from the mirror.
The document exit sensor detects the ejection of a document. A photo sensor is used for the sensor.
Signal name
COVER
DF_OPN
SIZE
WIDTH
EMPTY
REGST
POS
HAISI
Part name
ADF top cover
open switch
ADF open
sensor
Document
length sensor
Document width
sensor
Document
empty sensor
ADF registration
sensor
ADF read
sensor
ADF exit sensor
Functional description
Detects the open/close state
of the top cover during jam-
ming processing, etc.
Detects the open/close state
of the ADF unit.
Detects the length of docu-
ment.
Detects the width of docu-
ment.
Detects the loading of docu-
ment.
Detects the aligning posi-
tion of document.
Detects the document scan-
ning start position.
Detects the ejection of docu-
ment.
Status
-
Low: Open
Low: Document present
-
Low: Document present
Low: Document present
Low: Document present
Low: Document present
Note
Microswitch
Photo sensor
Photo sensor
Variable resistor
Photo sensor
Photo sensor
Photo sensor
Photo sensor