OKI ML521 Manual de usuario descargar pdf (Pagina 227)

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Service Guide ML520/521

Chapter A Reference Charts

A.2.01 Main Controller Board (FJIM)

Function

The main controller board contains a microprocessor, EPROM, EEPROM, drive circuitry, 128 Kbyte

DRAM, sensors and interface connector. The AC voltages from the power supply are rectified and

regulated on the main controller board.

Firmware

05CB: CMOS Dynamic RAM (1 MBit)

05CA: EPROM (Program)

Fuses

F1: 125 Volt 2 amp. (AC line fuse)

F2: soldered - 2 amp. (protects the +40vdc motor drive circuit)

Jumpers

NONE

Sensors

SNS1: Rear / Top Feed Paper Out Sensor

SNS2: Bottom Feed Paper Out Sensor

Switches

BASW: Paper Path Select Switch

Test Points

Frame Ground CN1 pins 37,38

Logic Ground CN1 pin 33

+5 vdc : CN7 - Pin 6 (logic circuitry voltage)

+40 vdc: CN7 - Pins 29 and 31 (Printhead, Space Motor / Line Feed Motor Drive Voltage)

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OKI ML521 Manual de usuario Pagina 227