Brother DX-2000 Service Manual
LASER PRINTER
SERVICE MANUAL
DX-2000
MECHANICS & ELECTRONICS
CONTENTS
CHAPTER I GENERAL....................................................................I-1
1. SPECIFICATIONS...........................................................................................I-1
CHAPTER II MECHANICAL SYSTEM............................................II-1
1. BLOCK DIAGRAM..........................................................................................II-1
2. PAPER FEED MECHANISM..........................................................................II-1
3. PAPER FEED SEQUENCE............................................................................II-2
4. PAPER PRESSER MECHANISM...................................................................II-3
CHAPTER III ELECTRICAL SYSTEM...........................................III-1
1. COMPOSITION .............................................................................................III-1
2. MAIN PCB FUNCTION..................................................................................III-1
2.1 I/F Circuit .......................................................................................................................III-1
2.2 Regulator.......................................................................................................................III-1
2.3 Fan Drive Circuit............................................................................................................III-1
2.4 Motor Drive Circuit.........................................................................................................III-1
2.5 Solenoid Actuator ..........................................................................................................III-1
2.6 Sensor Input ..................................................................................................................III-1
3. I/F PCB..........................................................................................................III-2
4. COMMUNICATION WITH THE PRINTER.....................................................III-2
CHAPTER IV DISASSEMBLY......................................................IV-1
1. EXTERNAL COVERS................................................................................... IV-1
1.1 Composition.................................................................................................................. IV-1
1.2 Side Cover R ................................................................................................................IV-1
1.3 Side Cover L.................................................................................................................IV-3
1.4 Bottom Cover................................................................................................................ IV-4
1.5 Top Cover..................................................................................................................... IV-5
2. OUTSIDE FRAME UNIT............................................................................... IV-7
2.1 Composition.................................................................................................................. IV-7
2.2.1 Removing the outside frame unit from the Duplex unit................................................. IV-7
2.2.2 Mounting the outside frame unit in the Duplex unit....................................................... IV-9
2.3 Duplex I/F PCB...........................................................................................................IV-10
2.4 Outside Frame R Assy, L Assy................................................................................... IV-11
2.5 Paper Pressing Gear 1, 2........................................................................................... IV-12
i
2.6 Paper Presser Motor................................................................................................... IV-13
2.7 T Belt B40S2M396...................................................................................................... IV-14
2.8 Photo Interrupter 1240................................................................................................ IV-14
3. INSIDE FRAME UNIT................................................................................. IV-15
3.1 Reversible Frame ....................................................................................................... IV-15
3.2 Photo interrupter 1240................................................................................................IV-15
3.3 Solenoid...................................................................................................................... IV-16
3.4 Carriage Guide 2 Assy................................................................................................ IV-16
3.5 Carriage Guide 1 ........................................................................................................IV-17
3.6 Duplex PCB Assy ....................................................................................................... IV-17
3.7 DC Fan Motor............................................................................................................. IV-18
3.8 Reversible Motor Assy................................................................................................ IV-19
4. DU TRAY CARRYING WAY UNIT.............................................................. IV-20
CHAPTER V TROUBLESHOOTING..............................................V-1
APPENDICES
1. CONNECTION DIAGRAM............................................................................. A-1
2. MOTOR DRIVE CIRCUIT.............................................................................. A-2
3. MAIN PCB CIRCUIT...................................................................................... A-3
ii
CHAPTER I GENERAL
1. SPECIFICATIONS
(1) Paper type Cut sheet
Feedable paper weight : 60 ~ 105 g/ m
(2) Paper size Max. : 216.0 x 356.0 mm
Min. : 182.0 x 257.0 mm
A4, Letter, Legal, Executive, ISO B5 (not available for
the optional lower paper cassette)
(3) Input power supply 24V DC ± 10%, max. 0.7 A (supplied from the printer)
(4) Feeding system Type :Reversal type
Paper feeding system :Alternate paper feeding system
(5) Paper feed Paper feeding rate : 117.6 mm/sec. (20 ppm)
94.1 mm/sec. (16 ppm)
70.6 mm/sec. (12 ppm)
Feedable paper size :A4 210.0 x 297.0 mm
Letter 215.9 x 279.4 mm
Legal 215.9 x 355.6 mm
Executive 184.2 x 266.7 mm
B5 182.0 x 257.0 mm
(6) Dimensions 323.0 (W) x 105.0 (D) x 286.0 (H) mm
(7) Weight 5.4 kg
2
(8) Environmental conditions
1) Operating Temperature : 10°C ~ 32.5°C
Humidity : 20% RH ~ 80% RH (No dew
condensation allowed)
2) Idling Temperature : 0°C ~ 35°C
Humidity : 10% RH ~ 80% RH (No dew
condensation allowed)
3) Storage
Store the unit under the following conditions to ensure reliable performance.
Normal (90% of entire storage period)
Temperature Severe (10% of entire storage period) High
Low
Temperature variation (within 3 minutes)
Normal (90% of entire storage period) 35%RH ~ 85%RH
Humidity* Severe (10% of entire storage period) High 85%RH ~ 95%RH
Low 10%RH ~ 35%RH
Air pressure 613 ~ 1013hPa
Storage life 0.5 years
0°C ~ 35°C
35°C ~ 60°C
-20°C ~ 0°C
60°C →15°C
-20°C→25°C
*No dew condensation allowed
I-1
4) Transportation conditions
Environment :
5) Vibration
During operation
At standby
When packed
6) Inclination The feeder must operate properly even at an
7) Mechanical noise During printing : 55 dB (A) or below
(9) Interface
1) Connector signal table (8 pin modular jack)
Temperature
-20°C ~ 60°C
Humidity 95%RH or below
Vibration
acceleration
Vibration
frequency
Measuring method
0.2 G 5 ~ 100 Hz Refer to the evaluation test standard.
0.2 G 5 ~ 100 Hz Same as above.
1.5 G 10 ~ 100 Hz Same as above.
inclination angle of 2.
At standby : 40 dB (A) or below
Pin Signal name
1 24V
2 SIDATA
3 24V
4 SICLK
5 GND
6 /ATTN
7 /RESET
8 GND
2) Interface circuit
5V
5V
Connector
0V
74LS07 or equivalent
I-2
CHAPTER II MECHANICAL SYSTEM
1. BLOCK DIAGRAM
The Duplex unit is composed of an outside frame, an inside frame and a Duplex tray, and
operates according to signals sent from the printer in serial communication.
Inside frame Outside frame
Printer
Serial
communication
Open cover sensor
I/F PCB
Paper pressure motor
Cassette sensor
Duplex tray
2. PAPER FEED MECHANISM
As soon as the printer requests for drive, a signal from the main PCB turns on the
solenoid to run the reversible motor clockwise (when viewed from the motor output shaft).
The Duplex unit will draw paper from the printer by turning on the solenoid.
The supplied paper is further transferred by the reversible motor driven reversible gears.
Figure 2.1
Main PCB
Fan motor
Reversible motor
Reverse sensor
Solenoid
When the reverse sensor detects the rear end of the paper, the reversible motor comes
to a momentary stop, and begins running counterclockwise.
Then the reversible motor enables the carriage rollers to feed the paper into the Duplex
tray installed within the Duplex unit. With the printer’s Duplex sensor on, the Duplex unit
stops the reversible motor by a request from the printer.
One cycle of paper feeding operation is completed in this way.
Duplex unitPrinter
Photosensitive drum
Pick up roller
Duplex sensor
Positioner
Du carriage roller
Reverse
sensor
Solenoid
Reversible gear
Reversible
motor
Main PCB
Figure 2.2
II-1
3. PAPER FEED SEQUENCE
(1) As soon as the printer requests for Duplex drive,
the solenoid is turned on, the flapper is switched,
and the motor runs forward.
(2) The reverse sensor is monitored to measure the
time from when the solenoid is turned on to when
the sensor is turned on.
If the sensor has not turned on after a specified
time passed, it is deemed that paper jam has
occurred.
(3) The solenoid is turned off in response to
instructions from the printer, and the flapper is
returned as it was before.
After the reverse sensor is turned on, the time up
to when the paper has passed through the reverse
sensor is monitored.
If the sensor has not turned off within a specified
time, it is deemed that paper jam has occurred.
(4) Immediately after the reverse sensor is turned off,
the motor begins through-down, stops for a
specified time, and runs backward.
II-2
(5) As soon as the printer requests for stop, the motor
stops and goes into a standby state.
•• Paper Feed Timing Chart
(when only one piece of A4 paper is reversed and printing speed is 12 ppm)
Solenoid
Reversible
motor
Reverse
sensor
Duplex
sensor
Duplex drive request from the printer
1.3 sec* 4.21 sec*
4.84 sec*
C.W C.C.W
Figure 2.3
* The paper feed timing varys in the printing speed.
For 16 ppm, 12/16 times the above values.
For 20 ppm, 12/20 times the above values.
4. PAPER PRESSURE MECHANISM
Upon a request from the printer, the paper pressure unit built in the Duplex tray is moved
up or down by the paper pressure motor connected to the I/F PCB.
0.1 sec
3.2 sec*
The paper pressure unit is moved up only when the first tray is selected on the printer to
supply paper, or down when paper is fed from another tray.
The cassette sensor detects the position of the paper pressure unit, and whether the
Duplex tray is loaded into the Duplex unit.
Paper pressure motor
I/F PCB
Paper pressure unit
Cassette sensor
Figure 2.4
II-3
CHAPTER III ELECTRICAL SYSTEM
1. COMPOSITION
I/F PCB
Printer
2. MAIN PCB FUNCTION
2.1 I/F Circuit
+24V
Main PCB
CPU
M50927
+5V
Motor drive circuit
Regurator
I/F circuit
Fan drive circuit
GND
Figure 3.1
This interface circuit is used to transmit and receive data with the printer. Since the
Duplex unit responds only to commands from the printer, the Duplex unit transmits its
status upon request from the printer.
2.2 Regulator
The regulator produces +5V logic power supply from the +24V supplied by the printer.
2.3 Fan Drive Circuit
This circuit drives the cooling DC fan.
The fan rotation speed is switched between two different levels according to the signal
from the CPU. It operates at high speed when the Duplex unit feeds paper, or it runs at
low speed while the unit is not in operation.
When the DC fan functions properly, it sends a /FLOCK signal to the CPU to confirm that
it is normal.
2.4 Motor Drive Circuit
According to the signal from the CPU, this circuit drives both the reversible motor and the
paper pressure motor.
2.5 Solenoid Actuator
According to the signal from the CPU, this actuator turns the solenoid on or off.
2.6 Sensor Input
Signals to each of the reverse sensor, cassette sensor and open cover sensor are
imported to the CPU port.
III-1
3. I/F PCB
The I/F PCB consists of two connectors (8-pin modular jack connectors) for connection of
the printer to other optional devices, a paper pressure motor, a cassette sensor, an open
cover sensor connector, and a connector for connection of the harness from the main
PCB.
This board only relays signals among the paper pressure motor, cassette sensor, open
cover sensor and printer and the main PCB.
4. COMMUNICATION WITH THE PRINTER
A 3-line clock synchronous serial interface is used for communication between the
Duplex unit and the printer.
The following describe the timing of communication way.
Printer Duplex unit
DATAOUT
DATAIN
CLKOUT
/ATNOUT
/OPRST
+24V
GND
SIDATA
SICLK
/ATTN
/OP RESET
+24V
GND
Figure 3.2
REG.
DATAIN
DATAOUT
CLKIN
/ATNIN
/RESET
+5V
GND
+24V
III-2
• Without a STATUS request
COMMAND transmission/receipt sequence
/ATTN
SICLK
500 min200 µs
III-3
400 min4µs
SIDATA
500 max
350 max
50 µs 12.8 µs
• Within a STATUS request
COMMAND transmission/receipt sequence
/ATTN
SICLK
400 min4µs
SIDATA
500 max
350 max
50 µs 350 max
6.4 min6.4 min
D0 D1 D2 D3 D4 D5 D6 D7
6.4 min
D0 D1 D2 D3 D4 D5 D6 D7
6.4 min
350 max
200 µs
350 max
200 µs
150 min
150 µs12.8 µs
STATUS transmission/receipt sequence
500 min
350 max
D0 D1 D2 D3 D4 D5 D6 D7
70 µs/1000 max 350 min
CHAPTER IV DISASSEMBLY
1. EXTERNAL COVERS
1.1 Composition
Side cover R
Bottom cover
1.2 Side Cover R
(1) Push the lock lever cover, turn and open the inside frame unit.
Lock lever cover
Lock lever cover
Side cover L
Top cover
Figure 4.1
Outside frame unit
Lock lever cover
Inside frame unit
Figure 4.2
IV-1
(2) Loosen the screw fastening the side cover R.
Side cover R
Taptite, bind B M3 x 6
Figure 4.3
(3) Using a small minus screwdriver, disengage the six hooks to remove the side
cover R from the outside frame R and the bottom cover.
(4) Separate the side cover R from the Duplex unit.
Outside frame R
Side cover R
Hooks
Hooks
Hooks
Bottom cover
Figure 4.4
IV-2
1.3 Side Cover L
(1) Unfasten the screw fastening the side cover L.
Taptite, bind B M3 x 6
Side cover L
Figure 4.5
(2) Using a small minus screwdriver, disengage the five hooks to remove the side
cover L from the outside frame L and the bottom cover.
(3) Separate the side cover L from the Duplex unit.
Side cover L
Hooks
Hooks
Outside frame L
Bottom cover
Figure 4.6
IV-3
1.4 Bottom Cover
(1) Turn and close the inside frame unit.
(2) Lay down the Duplex unit on the side to face up the bottom cover.
(3) Loosen the two screws.
Bottom cover
Taptites, cup S M3 x 6
PR99079
Figure 4.7
(4) Disengage the engaging locks of the bottom cover from the outside frame L, and
separate the cover from the Duplex unit.
Bottom cover
Engaging locks
Figure 4.8
IV-4
1.5 Top Cover
(1) Place the Duplex unit with the bottom down.
(2) Pushing the lock lever cover, turn and open the inside frame slightly. (approx.
30°)
Lock lever cover
Outside frame unit
Lock lever cover
Approx. 30°
Inside frame unit
Figure 4.9
(3) Disengage the hook of the lock lever cover by using a minus screwdriver, and pull
out the cover slantingly.
Lock lever cover
Top cover
Hook
Figure 4.10
IV-5
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