686770R Service Manual v.
CONTENTS
1.OVERVIEW.................................. 1-1
1.1TECHNICALSPECIFICATIONS..... 1-2
2.SPECIFICATIONS AND
OPERATINGPRINCIPLES......... 2-1
2.1SPECIFICATIONS......................... 2-1
2.1.1 Features................................... 2-1
2.1.2 Specifications........................... 2-1
2.1.3 Mechanisms............................. 2-2
2.2OPERATING PRINCIPLES........... 2-3
2.2.1 Transmission/SelectMechanism 2-3
2.2.2 SensorMechanism................... 2-7
2.2.3 PrintingMechanism.................. 2-8
2.2.4 InkingMechanism..................... 2-9
2.2.5 PaperFeedingMechanism....... 2-10
2.2.6 PrintCycleInitialization............. 2-12
3.HANDLING,MAINTENANCE....... 3-1
3.1HANDLING THE PRINTER........... 3-1
3.1.1 PrecautionsonPrinterHandling 3-1
3.1.2 PaperInstallation...................... 3-2
3.1.3 InkRollerInstallation................ 3-3
3.2MAINTENANCE............................. 3-4
3.2.1 Cleaning.................................. 3-4
3.2.2 Inspection................................. 3-4
3.3LUBRICATION............................... 3-4
3.3.1 Lubricant Types....................... 3-4
3.3.2 Lubrication Points.................... 3-4
3.3.3 List of lubricants....................... 3-4
3.4PROBLEMRESOLUTION.............. 3-5
3.5PRINTERPINASSIGNMENTS...... 3-7
3.6TIMINGCHART.............................. 3-9
4.DISASSEMBLY PROCEDURE/HOW
TO LOCATE THE ASSEMBLIES 4-1
4.1HOWTOLOCATE THEPOWER
ASSEMBLY.................................... 4-1
4.2THE REMOTE BATTERIES/
LOCATION OF ON/OFF SWITCH.4-2
4.3MACHINE DISASSEMBLY -
REASSEMBLY............................... 4-3
4.3.1 MachineCase........................... 4-3
4.3.2 Printer Unit............................... 4-3
4.3.3 Main Board and Display.......... 4-4
4.3.4 Paper Feed Motor.................... 4-4
4.3.5 Battery Compartment............... 4-5
4.3.6 Keypad..................................... 4-5
5.BLOCK STRUCTURE CHART... 5-1
5.1 CIRCUITRY.................................... 5-1
6.SCHEMATICS AND DIAGRAMS 6-1
6.1SYSTEM BLOCK DIAGRAM.......... 6-1
6.2POWERSUPPLYCIRCUIT............ 6-2
6.3RESETCIRCUIT............................ 6-3
6.4POWERFAILCIRCUIT.................. 6-3
6.5DISPLAYCIRCUIT......................... 6-4
6.6KEYBOARDCIRCUIT.................... 6-5
6.7BUZZERCIRCUIT.......................... 6-6
6.8BATTERYCIRCUIT....................... 6-6
6.9PRINTERCIRCUIT........................ 6-7
6-10 SCHEMATICDIAGRAM................. 6-9
7.ASSEMBLY CONSTRUCTION... 7-1
