HL-5030/5040/5050/5070N SERVICE MANUAL
iii
4.6
Printing on Both Sides of the Paper (manual duplex printing)
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2-24
4.7
Guidelines for printing on both sides of the paper
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2-26
4.8
Paper orientation for printing on both sides of the paper
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2-27
5.
CONTROL PANEL OPERATION
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2-28
5.1
Control Panel Buttons & LED functions
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2-28
5.1.1 LEDs
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2-28
5.1.2 Control Panel Buttons
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2-28
5.2
LED Indiations
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2-29
5.3
Service call indications
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2-31
5.4
Control Panel Button Operations
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2-32
5.5
Other Control Features
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2-33
5.5.1 Sleep mode
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2-33
5.5.2
Print a test page
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2-34
5.5.3 Print Settings
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2-34
5.5.4
Print fonts (For HL-5040, HL-5050 and HL-5070N)
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2-35
6.
NETWORK FUNCTIONS
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2-36
6.1
LED functions
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2-36
6.2
Network Factory default setting (For HL-5070N)
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2-36
7.
PAPER CASSETTE INFORMATION (FOR EUROPE ONLY)
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2-37
CHAPTER 3
THEORY OF OPERATION
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3-1
1.
ELECTRONICS
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3-1
1.1
General Block Diagram
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3-1
1.2
Main PCB Block Diagram
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3-2
1.3
Main PCB
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3-3
1.3.1 CPU
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3-3
1.3.2 USB
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3-5
1.3.3 IEEE 1284
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3-6
1.3.4 Network Interface
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3-7
1.3.5 ROM
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3-8
1.3.6 Flash ROM
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3-9
1.3.7 SDRAM
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3-10
1.3.8 Optional RAM
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3-11
1.3.9 EEPROM
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3-13
1.3.10 Reset Circuit
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3-13
1.3.11 Engine I/O
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3-14
1.3.12 Panel I/O
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3-14
1.3.13 Video I/O
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3-15
1.3.14 Power Supply
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3-16
1.4
Engine PCB
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3-17
1.5
Power Supply
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3-18
1.5.1 Low-voltage Power Supply
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3-18
1.5.2 High-voltage Power Supply
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3-19
2.
MECHANICS
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3-20
2.1
Overview of Printing Mechanism
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3-20
2.2
Paper Transfer
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3-21
2.2.1 Paper supply
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3-21
2.2.2 Paper registration
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3-21