Canon LBP-2000 Service Manual download pdf (Page 54)

2 - 15

CHAPTER 2

3 . Fixing heater safety circuit

To prevent malfunction of the fixing heater, the Printer monitors the readings of the main thermis-

tor and the sub thermistor at all times in relation to the ASIC and the high-temperature detection

circuit found on the DC controller PCB.

In the event of an error, the Printer causes the relay drive signal (RLYDRV) to go Low, thereby

turning off the fixing heater drive rely (RL1) found on the power supply PCB to cut the AC power to

the fixing heater (H101).

Relay

circuit

Fixing

assembly

NF NF

ASIC

CPU

Zero-cross circuit

Heater drive circuit

J1201

-5

J105

-31RLYDRV

/FSRDRV-4 -32

/HEATDT-1 -35

J1201

-3

J105

-33/ZEROXI

Power supply PCB DC controller PCB

F1SW1

H101

THSW101

J103

-6GND

GND

TH2

-5

-4

GND

TH1

-3

-2

THCNCT -1

-1

-3

-1

-3

J915

+3.3V, +5V, +24V

Low-voltage

power supply PCB

RL1

Heater

trigger circuit

Fixing heater

activation

detection circuit

J1202

-3

-1

High-temperature

detection circuit

High-temperature

detection circuit

Connector

detection

circuit

TH101TH101

J913

-1

-2

-3

-4

-5

-6

-5

-4

-3

-2

-1

Figure 2-2-6

Download Service Manual And Resetter Printer at http://printer1.blogspot.com

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Canon LBP-2000 Service Manual Page 54

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