Oki Microline 520 - Section 1: Getting Started; Unpack and Initial Setup

1.11.06 Warranty (Limited)......................................................................................... 1-25
1.11.07 Service.............................................................................................................1-25
SECTION TWO: PRINCIPLES OF OPERATION
2.1 ELECTRICAL OPERATION.......................................................................................... 2-1
2.1.01 Main Control Board..........................................................................................2-2
Block Diagram...........................................................................................................2-3
Program ROM............................................................................................................2-4
RAM ..........................................................................................................................2-4
LSI..............................................................................................................................2-5
Electrically Erasable Programmable Read Only Memory (EEPROM)..................... 2-5
2.1.02 Initialization......................................................................................................2-6
2.1.03 Parallel Interface Control..................................................................................2-7
2.1.04 Print Control......................................................................................................2-8
LSI/Printhead Interface.............................................................................................. 2-8
Gap Adjust Control....................................................................................................2-9
Print Compensation Control.......................................................................................2-9
2.1.05 Space and Line Feed (SP/LF) Motor Control................................................. 2-10
Line Feed Motor Control .........................................................................................2-10
Space Motor Control................................................................................................2-11
Encoder Disk............................................................................................................ 2-11
2.1.06 Operation Panel...............................................................................................2-12
2.1.07 Alarm Circuit.................................................................................................. 2-14
Driver Circuit Alarm Processing..............................................................................2-14
Low Motor Drive Voltage Alarm ............................................................................ 2-14
Head Drive Time......................................................................................................2-15
Print Speed...............................................................................................................2-15
Head Overheat Alarm Processing............................................................................ 2-15
2.1.08 Power Supply Circuit...................................................................................... 2-16
Table of Output Voltages.........................................................................................2-16
2.2 MECHANICAL OPERATION ..................................................................................... 2-17
2.2.01 Printhead Mechanism...................................................................................... 2-17
Printhead Gap Information.......................................................................................2-18
Interconnect Diagram: Control Board to Printhead................................................2-20
Line Feed Motor Resistance ..............................................................................2-21
Space Motor Resistance.....................................................................................2-21
Printhead Operation................................................................................................. 2-22
Printhead Temperature.............................................................................................2-22
2.2.02 Spacing Mechanism........................................................................................2-24
Spacing Operation....................................................................................................2-24
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