Brother HL-1260 service manual Font Cartridge IC Card Pcmcia Asic HG51CS265FD

CHAPTER III ELECTRICAL SYSTEM

Electric signal levels are expressed by ”High” (approximate the supply voltage) or ”Low” (approximate 0V). Signals with hyphen or slash, such as -FSRD or FSRD/, are low-active and signals without hyphen or slash, such as FSRD, are high-active signals.

1.MAIN PCB

1.1 Outline

The Main PCB consists of the Video Controller Circuit and the Engine Controller Circuit.

The Video Controller Circuit performs the following functions.

(1)Converts data received from an external device, such as a personal computer, through Centronics parallel interface or RS-232C serial interface into video data and transfers it to the Engine controller circuit.

(2)Displays the current printer status in LED and LCD, and enables settings from the control panel.

The operation sequence of the printer controlled by a microprocessor in the Engine Controller Circuit. The Engine Controller Circuit outputs signals to drive the various loads on the laser diode, scanner motor, main motor, etc. according to the print commands and image data from the external device.

Main PCB

Video controller

Main CPU

79R3041

PC

PC

CDCC (bolse) IF

RS-232C IF

FONT CARTRIDGE

IC CARD (PCMCIA)

ASIC

HG51CS265FD

+24V

Regurator

MIO RELAY

MIO BOARD (CONNECTOR) PCB

Engine controller

MASK ROM

16M mask 2 4MB

8M mask 2 2MB

DRAM

4M4 2MB

DRAM (SIMM 2 Slots)

64MBmax.

EEPROM

24CO4 4Kbit

Gate Array µPD65632GC

(IO PORT. ENGINE)

Engine CPU

M38063

CONTROL PANEL

+24V
+5V	Low-voltage
GND	Power Supply

Figure 3.1 Main PCB Block Diagram

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