Casio UP-250 User manual

EXTERNAL PRINTER
FEB. 2000
MODEL UP-250
(without price)
TECHNICAL MANUAL
Casio UP-250 external printer service ManualCasio UP-250 external printer service Manual
INDEX

1. This document contains confidential, proprietary information of CASIO or its affiliates.
You must keep such information confidential. If the user is a business entity or organization,
you must limit disclosure to those of your employees, agents and contractors who have
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FCC CLASS A
FCC Compliance Statement
For American Users
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment
is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to correct the interference
at his or her own expense.
WARNING
The connection of a non-shielded printer interface cable to this printer will invalidate the FCC Verification of this device
and may cause interference levels which exceed the limits established by the FCC for this equipment.
You are cautioned that changes or modifications not expressly approved by the party responsible for compliance could void
your authority to operate the equipment.
FOR CANADIAN USERS
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
GEREÄUSCHPEGEL
Gemäß der Dritten Verordrung zum Gerätesicherheitsgecsetz (Maschinenlärminformations- Verordnung-3. GSGV) ist der
arbeitsplatzbezogene Geräusch-Emissionswert kleiner als 70 dB(A) (basierend auf ISO 7779).

Introduction
PU-250 Series (Type B) printers are one-station printers for ECR and POS use that can print the results of weighing or
measuring. The main features of the PU-250 Series (Type B) printers are the following:
oHigh-speed printing through logic-seeking control
oExcellent reliability and long life resulting from the use of two stepping motors, one for moving the carriage and one
for paper feeding
oFlexible paper feed setting permits printing in accordance with any user-defined format
oCommand protocol based on ESC/POS, a widely used standard
oBuilt-in drawer kick-out interface provides capability to drive two drawers
oSelectable character fonts (7 x 9, 9 x 9)
oSemi-automatic paper loading capability
oAC adapter (included) provides compact power supply
oCompact and light in weight
oAutomatic Status Back (ASB) function to automatically send printer status changes
oAuto-cutter euipped
oTwo-color printing: black and red are selectable.
Notes and Cautions
Note:
Notes have important information and useful tips on the operation of your printer.
CAUTION:
Cautions must be observed to avoid damage to your equipment.

CONTENTS
Chapter 1 Features and General Specifications ......................................................1
Features .......................................................................................................................... 2
Printing Specifications ........................................................................................................ 2
Character Specifications..................................................................................................... 3
Paper .................................................................................................................................. 4
Auto-cutter .......................................................................................................................... 5
Paper Roll Supply Device................................................................................................... 5
Receive Buffer .................................................................................................................... 5
Electrical Specifications...................................................................................................... 5
Ribbon Cassette .................................................................................................................5
External Dimensions and Weight........................................................................................ 6
Environmental Specifications ............................................................................................. 6
Reliability ............................................................................................................................ 7
Safety Standards ................................................................................................................7
Printer Installation Position ................................................................................................. 7
Hardware Configuration ................................................................................................ 8
Main Unit Specifications ............................................................................................... 9
Paper Feed Motor............................................................................................................... 9
Carriage Motor.................................................................................................................... 9
Print Head Unit ................................................................................................................... 9
Home Position Sensor........................................................................................................ 9
Paper End Detector .......................................................................................................... 10
Paper Roll Near-end Detector (Optional) ......................................................................... 10
Connectors ................................................................................................................... 10
Interface Connector .......................................................................................................... 10
Power Supply Connector...................................................................................................11
Drawer Kick-Out Connector...............................................................................................11
Interface ........................................................................................................................ 13
RS-232 Serial Interface .................................................................................................... 13
RS-485 Serial Interface (option) ....................................................................................... 16
IEEE 1284 Parallel Interface ............................................................................................ 16
Buttons and Switches ................................................................................................. 19
Power Switch....................................................................................................................19
Panel Button ..................................................................................................................... 19
DIP Switches ....................................................................................................................20
Panel LEDs ................................................................................................................... 22
Self-test......................................................................................................................... 22
Error Processing.......................................................................................................... 23
Printer Operation When an Error Occurs........................................................................... 23
Data Receive Error ............................................................................................................ 23
Buffer Full Printing ...................................................................................................... 23
Detectors and Printing ................................................................................................ 23
Hexadecimal Dump...................................................................................................... 24
Performing a Hexadecimal Dump..................................................................................... 24
Options .........................................................................................................................24
External Power Supply PS-170 ........................................................................................ 25

Chapter 2 Mechanism Configuration and Operating Principles...........................26
Printer Mechanism Operating Principles................................................................... 26
Print mechanism unit ........................................................................................................ 27
Print head unit movement................................................................................................. 28
Wire movement when a single dot is printed.................................................................... 28
Printing a character (9x9 font) ......................................................................................... 29
Paper Feed Mechanism Unit ............................................................................................ 30
Paper loading (semi-automatic loading) ........................................................................... 31
Paper feeding ...................................................................................................................31
Ribbon Feed Mechanism Unit .......................................................................................... 32
Ribbon feeding ................................................................................................................. 33
Detection Mechanism Unit................................................................................................ 34
Home position detection mechanism................................................................................ 34
Paper detection mechanism ............................................................................................. 35
Paper roll near-end detection mechanism (optional)........................................................ 35
Auto-cutter mechanism..................................................................................................... 35
Ribbon Switch Mechanism Unit ................................................................................. 36
Switching from Black to Red............................................................................................. 36
Releasing from Red to Black ............................................................................................ 36
Electrical Circuitry Operating Principles ................................................................... 37
Hardware Configuration.................................................................................................... 37
Principles of Operation ............................................................................................... 41
Power Supply Circuitry ..................................................................................................... 41
Control Circuitry................................................................................................................ 42
CPU .................................................................................................................................. 43
Various detector circuits.................................................................................................... 46
Host interface circuit ......................................................................................................... 47
Drawer kick-out drive circuit ............................................................................................. 47
DIP switch read circuit ...................................................................................................... 48
Printer Mechanism Driver Circuits ............................................................................. 50
Print head driver circuit..................................................................................................... 50
Paper feed motor driver circuit ......................................................................................... 51
Carriage motor driver circuit ............................................................................................. 51
Auto-cutter driver circuit.................................................................................................... 52
Chapter 3 Handling and Maintenance .....................................................................53
Handling Precautions .................................................................................................. 53
Storage Precautions ......................................................................................................... 53
Use Precautions ............................................................................................................... 53
Paper Handling Precautions ............................................................................................. 53
Ribbon Cassette Handling Precautions ............................................................................ 54
Replacing the Paper Roll............................................................................................. 54
Replacing the Ribbon Cassette .................................................................................. 57
Removing Jammed Paper ........................................................................................... 60
Using the Power Switch Cover ................................................................................... 64
Inspection and Maintenance....................................................................................... 65
Cleaning........................................................................................................................66

Lubricants..................................................................................................................... 66
Standard Lubrication ........................................................................................................ 66
Lubricants ......................................................................................................................... 66
Lubrication Points ............................................................................................................. 67
Tool List ........................................................................................................................ 67
Chapter 4 Troubleshooting ......................................................................................68
Self-test......................................................................................................................... 68
Initiating the Self-test ........................................................................................................68
Self-test Standby .............................................................................................................. 68
Ending the Self-test .......................................................................................................... 68
Troubleshooting Flowchart ......................................................................................... 69
Troubleshooting Tables ............................................................................................... 76
Error Types and Countermeasures ............................................................................ 82
Chapter 5 Disassembly, Assembly, and Adjustment .............................................87
Small Part Specifications ............................................................................................ 87
Disassembly ................................................................................................................. 88
Removing the fuse............................................................................................................ 88
Removing the print head unit............................................................................................ 89
Removing the auto-cutter ................................................................................................. 91
Removing the main circuit board assembly ...................................................................... 92
Sub-assembly A ........................................................................................................... 94
Paper feed frame unit assembly ....................................................................................... 94
Main Assembly 1 .......................................................................................................... 98
Ribbon switch lever, ribbon release spring, ribbon release lever,
ribbon intermediate gear, ribbon transmission gear, ribbon take-up assembly,
and ribbon drive plate assembly ....................................................................................... 98
Main Assembly 2 ........................................................................................................ 100
Tension plate assembly .................................................................................................. 100
Main Assembly 3 ........................................................................................................ 100
Paper feed frame assembly ............................................................................................ 100
Main Assembly 4 ........................................................................................................ 101
Carriage motor assembly................................................................................................ 101
Main Assembly 5 ........................................................................................................ 102
Carriage sub assembly................................................................................................... 102
Main Assembly 6 ........................................................................................................ 103
Carriage shaft assembly................................................................................................. 103
Main Assembly 7 ........................................................................................................ 104
Adjustment roller shaft holder assembly......................................................................... 104
Main Assembly 8 ........................................................................................................ 105
Carriage guide shaft assembly ....................................................................................... 105
Main Assembly 9 ........................................................................................................ 105
Belt tension spring assembly.......................................................................................... 105

Main Assembly 10 ...................................................................................................... 106
Sensor assembly ............................................................................................................ 106
Main Assembly 11 ...................................................................................................... 108
Carriage motor heat sink assembly ................................................................................ 108
Main Assembly 12 ...................................................................................................... 108
Print head FPC assembly ............................................................................................... 108
Main Assembly 13 ...................................................................................................... 110
Print head unit ................................................................................................................ 110
Main assembly 14....................................................................................................... 111
Left cover fixing plate and right cover fixing plate........................................................... 111
Main Assembly 15 ...................................................................................................... 112
Ribbon frame earth plate ................................................................................................ 112
Main Assembly 16 ...................................................................................................... 113
Ribbon frame assembly, ribbon frame spring, and ribbon frame fixing plate .................. 113
Main Assembly 17 ...................................................................................................... 114
Thumb-screw and head cover ........................................................................................ 114
Main Assembly 1 (Case Unit) .................................................................................... 115
Lower cutter plate assembly ........................................................................................... 115
Main Assembly 2 (Case Unit) .................................................................................... 116
Upper plate assembly ..................................................................................................... 116
Main Assembly 3 (Case Unit) .................................................................................... 118
Main circuit board assembly ........................................................................................... 118
Main Assembly 4 (Case Unit) .................................................................................... 119
Inserting the cables ........................................................................................................ 119
Main Assembly 5 (Case Unit) .................................................................................... 120
Lower case assembly ..................................................................................................... 120
Main Assembly 6 (Case Unit) .................................................................................... 121
Manual cutter assembly and auto-cutter fixing plate ...................................................... 121
Main Assembly 7 (Case Unit) .................................................................................... 123
Auto-cutter assembly ...................................................................................................... 123
Main Assembly 8 (Case Unit) .................................................................................... 126
Paper roll receive rollers, upper case, guide roller, and switch panel assemblies .......... 126
Main Assembly 9 (Case Unit) .................................................................................... 128
Interface circuit board assembly and connector plate .................................................... 128
Main Assembly 10 (Case Unit) .................................................................................. 130
Lower plate, ROM cover, and rubber foot assembly ....................................................... 130
Main Assembly 11 (Case Unit) .................................................................................. 131
Main cover assembly ...................................................................................................... 131
Main Assembly 12 (Case Unit) .................................................................................. 132
Near-end detector assembly (optional)........................................................................... 132
Adjustment ................................................................................................................. 134
Platen gap adjustment.................................................................................................... 134

Appendix....................................................................................................................135
RS-485 Serial Interface .............................................................................................. 135
Main Circuit Board Parts Layout .............................................................................. 140
RS-232 Serial Interface Circuit Board Parts Layout ............................................... 141
IEEE 1284 Parallel Interface Circuit Board Parts Layout ....................................... 142
RS-485 Serial Interface Circuit Board Parts Layout ............................................... 143
Main Circuit Board Diagram...................................................................................... 144
RS-232 Serial Interface Circuit Board Diagram....................................................... 145
IEEE 1284 Parallel Interface Circuit Board Diagram............................................... 146
RS-485 Serial Interface Circuit Board Diagram....................................................... 147
Printer Mechanism Unit Overall Exploded Diagram ............................................... 148
Case Unit Overall Exploded Diagram....................................................................... 149
Printer Mechanism Unit Lubrication Points Diagram............................................. 150
Case Unit Lubrication Points Diagram .................................................................... 151
Parts List....................................................................................................................152
EXPLODED DIAGRAM FOR TM-U200B/U210B NO.1 .............................................154
EXPLODED DIAGRAM FOR TM-U200B/U200PB/U210B/U210PB NO.2 ................155

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