Casio UP-250 Technical Manual

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EXTERNAL PRINTER

FEB. 2000

MODEL UP-250

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TECHNICAL MANUAL

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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:

o High-speed printing through logic-seeking control

o Excellent reliability and long life resulting from the use of two stepping motors, one for moving the carriage and one

for paper feeding

o Flexible paper feed setting permits printing in accordance with any user-defined format

o Command protocol based on ESC/POS, a widely used standard

o Built-in drawer kick-out interface provides capability to drive two drawers

o Selectable character fonts (7 x 9, 9 x 9)

o Semi-automatic paper loading capability

o AC adapter (included) provides compact power supply

o Compact and light in weight

o Automatic Status Back (ASB) function to automatically send printer status changes

o Auto-cutter euipped

o Two-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

Figure 1-1 PU-250 appearance

POWER LED

Power switch

PAPER OUT LED

ERROR LED

FEED button

(PAPER OUT/PRESS FEED)

PROM

DIP switches

Power supply connector

Drawer kick-out connector

Frame ground screw

Interface connector

Frame ground screw

— 1 —

Chapter 1

Features and General Specifications

Features

Printing Specifications

NOTE:

If the print duty ratio is too high, the operation of the print head is stopped by the duty limit. In such circumstances, the print speeds shown above cannot be guaranteed. cpi = characters per inch.

Printing method: Serial impact dot-matrix Head wire configuration: 9-pin serial type

Figure 1-2 Dot configuration

Dot pitch: 0.353 mm (1/72") Dot wire diameter 0.29 mm (0.01") Printing direction: Bidirectional with logic seeking Printing width: 63.34 mm (2.49") Line feed: 4.233 mm (1/6"): default setting

Programmable in units of 1/144 inch by using commands.

Paper feed method Friction feed Paper feed speed: Approximately 4.17 inches/second (25 lines/second) during

continuous paper feeding

Characters per line: See the table on the next page. Characters per inch: See the table on the next page.

Total dot count (horizontal direction)

7 x 9 font: 400 half-dot positions per line 9 x 9 font: 400 half-dot positions per line

Print speed Approximately 3.5 lines/second (40 columns, 16 cpi)

Approximately 6.4 lines/second (16 columns, 16 cpi)

0.29 mm (0.01") (wire diameter)

0.317 mm (0.012")

0.353 mm (0.014")

— 2 —

Character dimensions, characters per inch, characters per line

NOTE:

The default font is 7 x 9; the dot spacing between characters is either 3 half dots or 2 half dots, depending on the setting of DIP switch 2-1.

Character Specifications

Character Structure

Horizontal x Vertical

Character

Structure

Character Set

Character

Dimensions

WxH

Dot Spacing

Between

Characters

Characters Per

Line (cpl)

Characters Per

Inch (cpi)

7 x 9

ANK

1.2 x 3.1 mm (.047 x .122")

 3 half dots 40 16

Graphics

1.7 x 3.1 mm (.070 x .122")

 0 40 16

9 x 9

ANK

1.6 x 3.1 mm (.063 x .122")

 3 half dots 33 13.3

Graphics

2.0 x 3.1 mm (.079 x .122")

 0 33 13.3

7 x 9

ANK

1.2 x 3.1 mm (.047 x .122")

 2 half dots 42 17.8

Graphics

1.6 x 3.1 mm (.063 x .122")

 0 42 17.8

9 x 9

ANK

1.6 x 3.1 mm (.063 x .122")

 2 half dots 35 14.5

Graphics

1.9 x 3.1 mm (.075 x .122")

 0 35 14.5

Character sets: Alphanumeric: 95

International: 32 Graphics: 128 x 8 pages

Character structure: 7 x 9 with 400 half-dot positions per line

9 x 9 with 400 half-dot positions per line

Figure 1-3 Character size (7 x 9 font example)

3.1 mm (0.122")

2.4 mm

(0.094")

1. 24 m m (0 .049" )

1.59 m m (0.0 63")

0.159 mm (0.006")

0.353 mm (0.014")

— 3 —

Paper

(*1)

This dimension shows the distance from the manual cutter to the print position.

(*2)

Values fo r the p rin ting are a are calcul ated (between dot cen ters) wit h the wi re diameter (0.29 m m [.011 "]).

Paper types: Paper roll: Plain paper or pressure-sensitive paper

Paper roll width: 76 ± 0.5 mm (2.99 ± .020")

Paper roll maximum diameter:

83 mm (3.27")

Paper roll core: Unless there is an optional near-end detector, you cannot use a paper

roll with the core and paper glued together.

Normal paper: Thickness: 1 sheet: 0.06 to 0.085 mm (.0024 to .0034")

Weight: 52.3 to 64 g/m

(13.9 to 17 lb)

(45 to 55 kg/1000 sheets/1091 x 788)

Pressure-sensitive paper Original sheet + up to 1 copy sheet

Thickness: 1 sheet: 0.05 to 0.08 mm (.0020 to .0031")

Total thickness: 0.2 mm (.0079") or less Recommended paper: Mitsubishi - carbonless paper (blue) Top and middle sheets: N40Hi

paper thickness: 0.06 mm (.0024") weight: 47.2 g/m

(12.6 lb)

Bottom sheet: N60

paper thickness: 0.08 mm (.0031") weight: 68.0 g/m

(18.1 lb)

Figure 1-4 Printing area

Maximum of 200 dots, 400 positions

76 mm (2.99")

20.2 mm (0.79") (*1)

Cutting position (manual cutter)

(*2)

63.34 mm (2.49")

[5.9 mm (0.23")] [6.76 mm (0.27")]

Cutting position (auto-cutter)

27 mm (1.063")

— 4 —

Auto Cutter

Partial cut is executed by a command. (A partial cut leaves one point uncut.)

Paper Roll Supply Device

Receive Buffer

Either 1KB or 40 bytes, selectable by DIP switches.

Electrical Specifications

Ribbon Cassette

Ribbon cassette specifications

(*1)

Ribbon life is based on the following conditions:

Character font: 7 x 9 font (with descenders) Print pattern: ASCII 96-character rolling pattern. See the specification published by EPSON for the print

pattern example.

NOTE:

Malfunctions and other problems may occur if a ribbon cassette other than the specified one is used.

Supply device: Drop-in loading

Power supply One of the following five AC adapters is included, depending on

the specifications:

AC adapter specifications

Power consumption (except when driving drawer kick-out):

Operating: Mean average 43 W

Standby: Average 6 W

Model number Color Ribbon life (*1) ERC-38 (P) Purple 4 million characters (with continuous printing at 25° C [77° F]) ERC-38 (B) Black 3 million characters (with continuous printing at 25° C [77° F])

ERC-38 (B/R)

Black and Red

Black: 1.5 million characters (with continuous printing at 25° C [77° F]) Red: 750,000 characters (with continuous printing at 25° C [77° F])

Settings and shipment

Input voltage range

Model name

Japan 100 V ± 10%, 50/60 Hz PA-6508 North America 120 V ± 10%, 60 Hz PB-6509 Europe (Germany) 230 V ± 10%, 50 Hz PB-6510 Europe (U.K.) 230 V ± 10%, 50 Hz PA-6511 Australia 240 V ± 10%, 50 Hz PA-6513

— 5 —

External Dimensions and Weight

Environmental Specifications

Height: 150 mm (5.91") Width: 160 mm (6.30") Depth: 248 mm (9.76") Weight: Approximately 2.5 kg (5.5 lb) Color: EPSON standard gray

Temperature: Operating: 0° to 50° C (32° to 122° F)

At 34° C (93° F) or higher, there are humidity restrictions; see the figure below.

Storage: –10° to 50° C (14° to 122° F), except paper and ribbon

Humidity: Operating: 10% to 90% RH (non-condensing)

Storage: 10% to 90% RH (non-condensing), except paper and ribbon

Figure 1-5 Operating temperature and humidity range

Vibration resistance: When packed:

Frequency: 5 to 55 Hz Acceleration: 2 G Sweep: 10 minutes (half cycle) Duration: 1 hour Directions: x, y, and z

Operating Temperature Range

40° C (104° F), 65%

34° C (93° F), 90%

50° C (122° F), 35%

0 10 40

Environmental Temperature

Relative Humidity [% RH]

3020

— 6 —

Reliability

Safety Standards

The following standards are applied only to the printers that are so labeled.

Printer Installation Position

Install the printer horizontally. Make sure it does not tilt more than 15°. The printer must also be installed so that it does not move or vibrate during paper cutting or the drawer kick-out operation. Fastening tape is available as an option.

Impact resistance: When packed:

Package: EPSON standard package Height: 60 cm (23.62")

Directions: 1 corner, 3 edges, and 6 surfaces

When unpacked:

Height: 5 cm (1.97") Directions: Lift one edge and release it (for all 4 edges)

Life

Mechanism: 7,500,000 lines (See the UP-250) Specification for the print color

switching number.

Print head: 150 million characters (using an average of 2 dots/wire per character.)

(The print pattern is shown in the UP-250 Specification in Figure A-1.)

Auto cutter: 800,000 cuts

End of life is defined as the point at which the printer reaches the beginning of the wear out period.

MTBF 180,000 hours

Failure is defined as a random failure occurring within the time of the random failure period.

MCBF 18,000,000 lines

This is an average failure interval based on failures relating to wear out and random failures up to the life of 7,500,000 lines.

For Europe: CE Marking:  EN55022, EN50082-1, EN45501

Safety standards:  TÜV

EMI:  FCC class A

For USA:

Safety standards:  UL1950-2TH-D3

c-UL

— 7 —

Hardware Configuration

Figure 1-6 UP-250 main unit configuration

Carriage motor

Paper feed motor

Paper end detector

Print head unit

Home position sensor

Paper roll near-end detector (optional)

Main circuit board

Interface circuit board

— 8 —

Type: 4-phase, 48-polarity, PM-type stepping motor Drive voltage: 24 VDC ± 10% Winding resistance: 58 Ω ± 2.9 Ω at 25°C (77°F), per phase

Current consumption: Peak: 1.1 A in worst case

Average: 200 mA at 24 VDC, 25°C (77°F), 600 pps

350 mA maximum

Type: 4-phase, 48-polarity, PM-type stepping motor Drive voltage: 24 VDC ± 10% Winding resistance: 39.5 Ω ± 1.9 Ω at 25°C (77°F), per phase

Current consumption: Peak: 1.5 A maximum

Average: 400 mA at 24 VDC, 25°C (77°F), 952 pps

600 mA maximum

Number of solenoids: 9 Winding resistance: 19.2 Ω ± 5% at 25°C (77°F), per phase Drive voltage: 24 VDC ± 10%

Type: Photo sensor Voltage: 5 VDC ± 5%

Output level: LOW when the carriage home position is detected

— 9 —

Main Unit Specifications

Paper Feed Motor

Carriage Motor

Print Head Unit

Home Position Sensor

Paper End Detector

Paper Roll Near-end Detector (Optional)

Connectors

Figure 1-7 Connector panel (serial interface)

Figure 1-8 Connector panel (parallel interface)

Interface Connector

See the interface section.

Type: Microswitch

Voltage: 5 VDC ± 5%

Output level: High when paper end is detected

Type: Microswitch

Voltage: 5 VDC ± 5%

Output level: Low when a paper near-end is detected

Frame ground screw connector

Power supplyDrawer kick-out

connector

Interface connector

Frame ground screw

Power supply connector

Drawer kick-out connector

Frame ground

screw

Interface connector

Frame ground

screw

— 10 —

— 11 —

This connector is used to connect the printer to an external power source.

NOTE:

Be sure to ground the frame ground (FG) screw on the board at the bottom of the unit. Ground

wire terminal hole diameter: 3.2 mm (.13"). Ground wire thickness: AWG 18 or equivalent.

A pulse specified by the

ESC p

command is output to the drawer kick-out connector. The host

can confirm the status of the input signal by using the

GS a

GS r

, or

DLE EOT

commands.

The host computer can check the drawer open/closed status with the

DLE EOT, GS a

, and

GS r

commands.

Pin assignments: See the table below.

Pin Number

1 + power supply

2 GND

3NC

Shell Frame GND

Pin Number Signal name Direction

1 Frame GND

Drawer kick-out drive signal 1 (See "Drawer kick-out drive signal," below.)

Output

Drawer open/close signal (See "Drawer open/closed signal," below.)

Input

4 +24

—

—VDC

Drawer kick-out drive signal 2 (See "Drawer kick-out drive signal," below.)

Output

6 Signal GND —

Input signal level: LOW = 0 V

HIGH = 2 to 5 V (at connector pin 3)

3 1

Signal Name

Power Supply Connector

Drawer Kick-Out Connector

Power supply connector pin assignments

Drawer kick-out connector pin assignments

Drawer open/closed signal

NOTES:

❏

Two driver transistors cannot be energized simultaneously.

❏

The drawer drive duty must be as shown below:

❏

Be sure to use the printer power supply (connector pin 4) for the drawer power source.

Output signal: Voltage = Approximately 24 VDC

Current = 1 A or less

Output waveform: Outputs the waveforms in Figure 1-8 to pins

2 and 5 of the connector.

1 (ON time) and t2

(OFF time) are specified by

ESC p

1 x 2 ms

2 x 2 ms

ON time

(ON time + OFF time)

≤ 0.2

— 12 —

Drawer kick-out drive signal

CAUTION:

To avoid overcurrent, resistance of the drawer kick-out solenoid must be 24 Ω or more.

Figure 1-9 Drawer kick-out drive signal output waveform

CAUTION:

Do not connect a telephone line to the drawer kick-out connector; otherwise the printer and the telephone line may be damaged.

Interface

RS-232 Serial Interface

NOTES:

❏

Handshaking, data word length, baud rate, and parity depend on DIP switch settings.

❏

Data transmitted from the printer has 1 stop bit (fixed).

Data transmission: Serial (compatible with RS-232)

Synchronization: Asynchronous

Handshaking: DTR/DSR or XON/XOFF control

Signal levels: MARK = -3 to -15 V: Logic 1/OFF

SPACE = +3 to +15 V: Logic 0/ON

Baud rates: 4800, 9600 bps

Data word length: 7 or 8 bits

Parity settings: None, even, odd

Stop bits: 1 or more

Connector: Female D-SUB 25-pin connector or equivalent

— 13 —

NOTES:

❏

When the remaining space in the receive buffer is 16 bytes, the printer buffer becomes full. This status continues until the space in the receive buffer increases to 32 bytes.

❏

The printer ignores data received when the remaining space in the receive buffer is 0 bytes.

❏

XON is not transmitted when the receive buffer is full.

Pin number Signal name I/O Function

1 FG — Frame ground

2 TXD O Transmit data

3 RXD I Receive data

4 RTS O Same as the DTR signal

6 DSR I This signal indicates whether the host computer can receive data. SPACE

indicates the host computer can receive data, and MARK indicates the host computer cannot receive data. When DTR/DSR control is selected, the printer transmits data after confirming this signal (except when transmitting data by

DLE

EOT

and

GS a

). When XON/XOFF control is selected, the printer does not check this signal. Changing the DIP switch setting lets this signal be used as a reset signal for the printer. The printer is reset when the signal remains MARK for 1 ms or more.

7 SG — Signal ground

20 DTR O 1) When DTR/DSR control is selected, this signal indicates whether the printer is

busy. SPACE indicates the printer is ready to receive data, and MARK indicates the printer is busy. A busy condition can be changed using DIP SW 1-8 as follows:

2) When XON/XOFF control is selected: This signal indicates whether the printer is correctly connected and ready to receive data. SPACE indicates the printer is ready to receive data. The signal is always SPACE except in the following cases:

❏

During the period after power on until the printer is ready to receive data.

❏

During self test.

25 INIT

I Changing DIP switch setting enables this signal to be used as a reset signal for

the printer (see the DIP switch settings in the “Buttons and Switches” section of this chapter). The printer is reset when the signal remains SPACE for 1 ms or more.

Printer

DIP SW 1-8 status

ON OFF

1. During the period from when power is turned on (including reset using the interface) to when the printer is ready to receive data.

BUSY BUSY

2. During self-test BUSY BUSY

3. During paper feeding using the paper FEED button — BUSY

4. When the printer stops printing for a paper-end. — BUSY

5. When an error has occurred. — BUSY

6. When a temporary abnormality occurs in the

power supply voltage

— BUSY

7. When the receive buffer becomes full. (See Notes.) BUSY BUSY

Off line

20 DTR

RS-232 interface connector pin assignments and functions

Interface Connector Pin Assignments

— 14 —

Switching between on line and off line

The printer does not have an on-line/off-line button. It goes off line under the following conditions:

❏

Between the time when power is turned on (including reset using the interface) and when the printer is ready to receive data.

❏

During the self-test.

❏

During paper feeding using the paper

FEED

button.

❏

Between the time when the printer stops printing for a paper-end and when the on-line recovery wait time finishes after loading paper (if an empty paper supply is detected by either the paper roll end detector or the paper roll near-end detector with a printing halt feature enabled for low paper by

ESC c 4

❏

When an error has occurred.

XON/XOFF transmission timing

When XON/XOFF control is selected, the printer transmits XON or XOFF signals as follows.

(

*1) XON is not transmitted when the receive buffer is full.

(*2) XOFF is not transmitted when the receive buffer is full.

NOTE:

The XON code is 11H and the XOFF code is 13H.

Printer status

DIP SW 1-8 status

ON OFF

XON transmission

• When the printer goes on line after turning power on or after reset using the interface.

• When the receive buffer is released from the buffer full state.

• When the printer switches from off line to on line (*1).

• When the printer recovers from an error through a command.

Transmission Transmission

----

Transmission

Transmission Transmission Transmission Transmission Transmission

XOFF transmission

• During an error condition.

• When the receive buffer becomes full (*2).

Transmission

----

Transmission Transmission

Serial interface connection example

NOTES:

❏

Set handshaking so that transmitted data can be received.

❏

Transmit data to the printer after turning on the power and initializing the printer.

Host

Printer

TXD

DSR

CTS

RXD

DTR

RXD

DTR

RTS

TXD

DSR

— 15 —

RS-485 Serial Interface (option)

Refer to the Appendix for details.

IEEE 1284 Parallel Interface

Complies with the standard described in t he IEEE 12 84 specificat ion by the I nstitute o f Electr ical and Electronic Engineers, Inc.

Specification

Data transmission: 8-bit parallel Synchronization: Externally supplied STRO BE

signals

Handshaking:

and BUSY signals Signal levels: TTL-compatible Connector: 57RE-40360-830B (DDK) or equivalent (IEEE 1284 Type B) Reverse communication

(Printer to host): Nibble or byte mode

Reverse Mode (Data Transmission from Printer to Host)

Status data transmission from the printer to the host occurs in nibbl e or byte mode. These modes allow data transmission from the asynchronous printer under control of the host. Data transmissions in nibble mode are made via the existing control lines in u nits of four bits (a nibble). In byte mode, data transmissions proceed by making the eight-bit data lines bidirectional. Both modes fail to proceed concurrently in compatibility mode, causing half duplex transmission. The IEEE 1284 nibble/byte modes are under development in draft form and may be subject to change.

ACK

— 16 —

Interface Connector Pin Assignments

IEEE 1284 interface connector pin assignments and functions

NOTES:

❏ ❏ ❏

❏ ❏

❏

Overscored signal names are LOW active signals. If a host does not provide for the signal lines listed above, two-way communication fails. For interfacing, signal lines must use twisted pair cables with the return sides connected to signal ground level. Interfacing conditions must all be based on the TTL level to meet the characteristics described below. In addition, both the rise and fall time of each signal must be 0.5 µs or less. Data transmission must not ignore the ACK or BUSY signal. An attempt to transmit data with either the ACK or BUSY signal ignored can cause lost data. (Data transmissions to the printer must be made after verifying the ACK signal or while the BUSY signal is at a LOW level.) Interface cables should be as short in length as possible.

NC: Not Connected ND: Not Defined

— 17 —

Pin number Source Compatibility Mode Nibble Mode Byte Mode

1 Host Strobe

Host Clk Host Clk

2 Host/Ptr Data0 (LSB) Data0 (LSB) Data0 (LSB)

3 Host/Ptr Data1 Data1 Data1

4 Host/Ptr Data2 Data2 Data2

5 Host/Ptr Data3 Data3 Data3

6 Host/Ptr Data4 Data4 Data4

7 Host/Ptr Data5 Data5 Data5

8 Host/Ptr Data6 Data6 Data6 9 Host/Ptr Data7 (MSB) Data7 (MSB) Data7 (MSB)

10 Printer Ack

PtrClk PtrClk

11 Printer Busy PtrBusy/Data3,7 PtrBusy

12 Printer PError

AckDataReq/ Data2,6

AckDataReq

13 Printer Select Xflag/Data1,5 Xflag

14 Hostr AutoFd

HostBusy HostBusy

15 NC ND ND

16 GND GND GND

17 FG FG FG

18 Printer Logic-H Logic-H Logic-H

19-30 GND GND GND

31 Host Init

Init Init

32 Printer Fault DataAvail /Data0, 4 DataAvail

33 GND ND ND

34 Printer DK_STATUS ND ND

35 Printer +5V ND ND

36 Host SelectIn

1284-Active 1284-Active

Reception of status from the printer through the bidirectional parallel interface

In bidirectional parallel interface operation, printer status transmission is available using the two-way communication facility of the IEEE 1284-compatible nibble/byte modes. In this case, unlike in RS-232 serial interface operation, real-time interruptions from the printer to the host are disabled, and so you must pay attention to the following.

❏

The maximum capacity of the printer’s internal buffer is 100 bytes (except ASB status). Status signals exceeding this capacity are discarded. To prevent possible loss of status, the host must be ready for data reception (Reverse Mode).

❏

When ASB is used, the host is preferably in the wait state for data reception (Reverse Idle Mode). When this state is not available, the host enters Reverse Mode to continually monitor data presence.

❏

When ASB is used, preference is given to ASB status for transmission over other status signals. Any accumulated ASB status signals left for transmission from the last to the newest ASB status transmissions are transmitted together at one time as one ASB status showing the presence of change, followed by the latest ASB status.

Example: In the normal (wait) state, the ASB status is configured as follows:

In a sequence of operations including near end detection and the paper FEED button being pressed and released, the following pieces of data are accumulated.

When ASB status is received following this, a total of eight (8) bytes of ASB will be transmitted as follows: Accumulated ASB (

➀+➁+➂).

First Status Second Status Third Status Fourth Status

0001 0000 0000 0000 0000 0000 0000 0000

First Status Second Status Third Status Fourth Status

➀

0001 0000 0000 0000 0000 0011 0000 0000

Near end detection.

➁

0101 1000 0000 0000 0000 0011 0000 0000

Paper FEED button is pressed.

➂

0001 0000 0000 0000 0000 0011 0000 0000

Paper FEED button is released.

First Status Second Status Third Status Fourth Status

Accumulated ASB (

➀+ ➁+ ➂

) 0101 1000 0000 0000 0000 0011 0000 0000

+ First Status Second Status Third Status Fourth Status

The latest ASB (➂) Fourth Status

0001 0000 0000 0000 0000 0011 0000 0000

— 18 —

Notes on setting DIP switch 1-8 to ON

The printer mechanism stops but does not become busy when an error occurs, printing stops for a paper end, or paper is fed using the FEED button.

When setting DIP switch 1-8 to ON to enable handshaking with the printer, be sure to check the printer status with

GS a

and ASB function. In this setting, the default value of

for

GS a

is 2.

The printer automatically transmits the printer status, depending on on-line/off-line changes.

When using

DLE EOT

and

DLE ENQ

, be sure that the receive buffer does not become full.

❏

If the host cannot transmit data when the printer is busy or if an error occurs,

DLE EOT

and

DLE ENQ

cannot be used when printer is busy because the receive buffer has become full.

❏

With a host that can transmit data when the printer is busy, if the printer’s receive buffer becomes full while the host is sending bit-image data, a

DLE EOT

DLE ENQ

command transmitted during sending of bit-image data is processed as bit-image data, not as a command. Secondly, any data transmitted when the receive buffer is full may be lost.

Example: Check printer status using

GS r

after transmitting each line of data and use the 1KB

receive buffer. Transmit one line of data so that the receive buffer does not become full.

Buttons and Switches

Power Switch

Note:

Turn on the power only after connecting the power supply.

Panel Button

The panel button is enabled or disabled by the

ESC c 5

command. This button is inactive if it is

disabled.

Note:

The

ESC c 5

command enables or disables the panel button. When disabled, the button does not

function. However, when loading a paper roll, you can feed paper with the

FEED

button during the

paper loading waiting time if the paper loading waiting time is set by

GS z 0

. Press the

FEED

button

again after the

PAPER OUT LED

starts blinking to return the printer to the on-line state.

Type: Rocker switch

Function: The power switch turns the power on or off.

Feed

(FEED

) button: Type: Non-locking push button

Function: Feeds paper based on the line feed amount set by

ESC 2

and

ESC 3

— 19 —

DIP Switches

Serial interface (RS-232 and RS-485 (option))

The DIP switches are located at the bottom of the case.

NOTES:

❏

Do not change the setting of DIP switch 2-2 (fixed to ON).

❏

Changes in DIP switch settings (excluding switches 2-3 and 2-4, which are I/F reset signals) are recognized only when printer power is turned on or reset using the interface. If the DIP switch setting is changed after printer power is turned on, the change does not take effect until the printer is turned on again or reset.

Parallel interface (IEEE 1284)

The DIP switches are located at the bottom of the case.

DIP switch 1

DIP Switch Function ON OFF

1 Data receive error Ignored Prints “?”

2 Receive buffer capacity Data buffer 40 bytes Data buffer 1KB

3 Handshaking XON/XOFF DTR/DSR

4 Data word length 7 bits 8 bits

5 Parity check Yes No

6 Parity selection Even Odd

7 Baud rate selection 4800 bps 9600 bps

8 Busy condition When the receive buffer is full

When the receive buffer is full in off-line status

DIP switch 2

DIP Switch Function ON OFF

Print column selection 7 ✕ 9 font/9 ✕ 9 font

42CPL/35CPL 40CPL/33CPL

For internal use only Setting must not be changed. (Fixed to ON.)

3 I/F pin 6 reset signal Enabled Disabled

4 I/F pin 25 reset signal Enabled Disabled

DIP switch 1

DIP Switch Function ON OFF

1 Auto line feed Enabled Disabled

2 Receive buffer 40 bytes Approximately 1KB

3-7 Undefined

8 Busy condition

Receive buffer full Scanning data

Off-line Receive buffer full Scanning data

— 20 —

NOTES:

❏

Do not change the setting of DIP switches 2-2 and 2-4 (fixed to ON).

❏

Changes in DIP switch settings (excluding switch 2-4, which is the I/F reset signal) are recognized only when printer power is turned on or reset using the interface. If the DIP switch settings are changed after printer power is turned on, the change does not take effect until the printer is turned on again or reset.

DIP switch 2

DIP Switch Function ON OFF

Print column selection

I/F Init reset signal

7 ✕ 9 font/9 ✕ 9 font

42CPL/35CPL 40CPL/33CPL

2 Internal use (See Notes.)

3 Undefined

Fixed to ON Fixed to ON

— 21 —

Panel LEDs

Self-test

The printer has a self-test function that checks the following:

❏

Control circuit functions

❏

Printer mechanisms

❏

Print quality

❏

Control ROM version

❏

DIP switch settings.

See Chapter 4 for instructions on running a self-test.

Power (

POWER

) LED: Green

On: 24 V power supply is stable.

Off: 24 V power supply is not stable.

Paper roll near-end

(

PAPER OUT

) LED:

Red

On: Paper roll near-end is detected. (*1)

Off: Adequate paper remains on the paper roll (normal

condition).

Blinking: Waiting for restart test print on paper roll or for

return to on-line status after automatic paper feeding.

(*1)

The near-end detector is an option.

Error (

ERROR

) LED: Red

On: Off-line (except during paper feeding using the

FEED

button and during the self-test).

Off: Normal operation.

Blinking Error state. (Refer to “Error types and

countermeasures” in Chapter 4.)

— 22 —

Error Processing

Printer Operation When an Error Occurs

The printer executes the following operations upon detecting an error:

Serial interface

❏

All mechanical operations stop.

❏

DTR signal is set to MARK (only when DTR/DSR is selected and DIP switch 1-8 is off).

❏

The

ERROR

LED blinks.

❏

XOFF is transmitted when XON/XOFF control is selected (only when DIP switch 1-8 is off).

Parallel interface

❏

All mechanical operations stop.

❏

The BUSY signal is set to HIGH (only when DIP switch 1-8 is off).

❏

The

ERROR

LED blinks.

❏

Fault

signal is set to LOW.

Data Receive Error

If one of the following errors occurs, the printer prints “?” or ignores the data, depending on the setting of DIP switch 1-1:

❏

Parity error

❏

Framing error

❏

Overrun error.

Buffer Full Printing

When subsequent data is received after the printer processes one line of data in the print buffer, the printer automatically prints the processed data and feeds the paper one line.

Detectors and Printing

When the printer detects a paper near-end, it stops or continues printing, depending on the

ESC

c 4

command setting. The roll paper detector always halts printing when there is no paper.

— 23 —

Hexadecimal Dump

This function prints data transmitted from the host computer in hexadecimal numbers and in their corresponding ASCII characters.

Performing a Hexadecimal Dump

1. Turn the printer power off.

2. Set DIP switch 1-2 to on to select 40 bytes for the receive buffer capacity.

3. Turn the power on while pressing the

FEED

button.

4. Before finishing the initialization of the printer, release the

FEED

button, then press the

FEED button again. The printer first prints “Hexadecimal Dump” on the paper roll, and prints the data received thereafter in hexadecimal numbers and their corresponding characters until the printer is turned off.

NOTES:

❏

“.” is printed if no printable ASCII character corresponds to the data received.

❏

Control commands are printed in bold for emphasis.

❏

During the hexadecimal dump, all commands except DLE EOT and DLE ENQ are disabled.

❏

Insufficient print data to fill the last line can be printed by taking the printer off line. (See “Switching between on line and off line“ earlier in this chapter.)

Sample hexadecimal dump

Hexadecimal Dump

1B 21 00 1B 26 02 40 40 1B 69 : . ! . . & . @ @.i

1B 25 01 1B 63 34 00 1B 30 31 : . % . c4 . .. 01

41 42 43 44 45 46 47 48 49 4A : ABCDEFGHIJ

Options

❏

Paper roll near end detector (dealer option)

❏

External power supply PS-170

❏

Printer fastening tape (DF-10)

❏

RS-485 serial interface

❏

IEEE 1284 compatible interface board (Bidirectional parallel: factory-installed)

❏

RS-232 compatible interface board (factory-installed)

— 24 —

External Power Supply PS-170

Specifications

Input Conditions

Output specifications

Compliance to safety regulation

The following standards are applied only to the equipment with marks and statements

NOTE:

Use o n l y t he EP SON PS-1 7 0 power supply to avoid da mage t o the printer and the power supply.

100 V, 120 V, or 230 V (specified at time of purchase)

Input voltage (rating) 90 to 264 V

(100 VAC-10% to 230 VAC + 15%)

108 VAC to 132 V (120 V type) Frequency (rating) 50 to 60 Hz ± 3 Hz Input current (rating) Less than 100 VA AC switch None Energizing LED None

Output voltage (rating) 24 VDC ± 5% Output voltage (rati ng) 2.0 A Output electric power

(rating)

48 W

Output peak current 4.5 A (within 300 msec)

UL/C-UL/TÜV

— 25 —

Chapter 2 Mechanism Configuration and Operating Principles

Printer Mechanism Operating Principles

The M-U200 printer mechanism mounted in the UP-250 is composed of six mechanisms: print, paper feed, ribbon feed, detector, auto-cutter, and ribbon switch.

Figure 2-1 M-U200

— 26 —

Print mechanism unit

The print mechanism unit consists of the parts shown in the figure below.

Figure 2-2 Print mechanism unit

Paper feed frame assembly

Belt

Print head unit

Belt tension pulley

Carriage guide shaft

Carriage shaft

Carriage motor assembly

Print head FPC

Print head ground plate assembly

Carriage sub assembly

— 27 —

Print head unit movement

When the carriage motor is driven and the carriage motor gear moves in the direction of arrow B (forward rotation), the rotational power is conveyed to the belt drive pulley, then the belt. Next, the carriage sub assembly, which is fixed to the belt, moves in the direction of arrow B.

When the carriage motor gear rotates in the direction of arrow A (reverse rotation), the carriage sub assembly moves in the direction of arrow A.

Wire movement when a single dot is printed

When the specified print head drive pulse is input to the drive coil, the iron core is magnetized, and the actuating plate is pulled in the direction of arrow A. This action pushes the wire toward the platen. When the wire strikes the ink ribbon and paper against the platen, a single dot is printed. (The “platen” is the portion of the paper feed frame being struck by the wires during printing.)

When energizing of the drive coil is completed, the wire and actuating plate are returned to the standby position by the wire return spring and actuating plate spring.

Figure 2-3 Print head unit movement

Figure 2-4 Printing

Belt

Carriage motor gear

Belt drive pulley

Carriage sub assembly

Actuating

Paper roll

Ink ribbon

Wire return

Drive coil

plate

spring

Wire

Wire guide

Iron core

Platen

— 28 —

Printing a character (9x9 font)

A character is printed by energizing the print solenoids with respect to the carriage sub assembly portion. (The reference timing for the print solenoids is the carriage motor phase switching signals.) The print head unit moves 0.31 7 mm (0.012”) (in approximately 1.05 ms) each time the carria ge motor rotates on e step (7.5°).

To print the character “2,” print solenoids 2 and 9 are energized first using the same timing as the carriage motor phase switching signal. Then, print solenoid 8 is energized at TnH (being delayed a half dot). The remaining print solenoids are energized correspondingly, and the character “2” is finally printed.

Figure 2-5 Print timing chart

1 2

3 5

4 6

7 8 9

TnH

Tn+2Tn+1

TnH(4)

Tn+5Tn+4

Carriage motor phase switch timing

Print solenoid

Tn+3

— 29 —

Paper Feed Mechanism Unit

The paper feed mechanism unit consists of the parts shown in the figure below. Paper feeding is performed by driving the paper feed motor (stepping motor).

Figure 2-6 Paper feed mechanism unit

Paper hold spring

Paper hold roller

Paper hold roller shaft

Paper feed roller assembly

Upper paper guide

Paper feed frame assembly

Paper feed reduction gear

Paper feed motor

— 30 —

Paper loading (semi-automatic loading)

When the paper roll is manually inserted into the paper feed roller, the paper detection switch in the paper path detects the paper, and semi-automatic loading is executed. (Semi-automatic loading is the function that automatically feeds paper to the top of the paper feed frame assembly when a paper roll is inserted in the paper path after the detector detects no paper.)

Paper feeding

Paper feeding is performed by conveying the paper feed motor’s rotational power from the paper feed motor gear through the paper feed reduction gear, paper feed gear, and paper feed roller.

Since the paper feed roller and paper hold roller are pressed together, paper advances to the top of the paper feed frame assembly because of the friction between the rubber of the paper feed roller and the paper hold roller.

Figure 2-7 Paper loading

Paper

Paper feed

Upper paper guide

Guide roller

Upper case

Paper feed roller

Base frame assembly

Paper hold roller

Paper hold plate spring

frame

— 31 —

During printing, the paper feed motor is driven after each line is printed, causing the paper to be fed a specified amount. While the

FEED

button on the control panel is pressed, the paper feed

motor is driven and the paper roll is fed.

Ribbon Feed Mechanism Unit

The ribbon feed mechanism unit consists of the parts shown in the figure below. The printer feeds the ribbon automatically as the carriage motor rotates.

Figure 2-8 Paper feeding

Figure 2-9 Ribbon feed mechanism unit

Paper roll

Paper feed roller

Paper feed

Paper feed gear

Paper hold roller

reduction gear

motor gear

Ribbon intermediate gear

Ribbon cassette

Ribbon take-up assembly

Ribbon drive plate assembly

Ribbon transmission gear

Ribbon frame assembly

— 32 —

Ribbon feeding

When the carriage motor rotates forward and the carriage motor gear rotates in the direction of arrow A, the ribbon intermediate gear and ribbon drive gear rotate in the directions of arrows B and C, respectively. This causes the ribbon drive plate to move in the direction of arrow D, with the ribbon intermediate gear shaft in the center, until the ribbon drive gear engages the ribbon transmission gear.

Since the ribbon transmission gear and the ribbon take-up gear are always engaged, the ribbon take-up gear rotates in the direction of arrow E.

When the carriage motor rotates in the reverse direction and the carriage motor gear rotates in the direction of arrow F, the ribbon drive plate moves in the direction of arrow G, disengaging the ribbon drive gear from the ribbon transmission gear.

Therefore, the ribbon take-up assembly rotates in the direction of arrow E only when the carriage motor rotates forward. Then the ribbon feed and ribbon hold rollers in the ribbon cassette, which are engaged with the ribbon take-up assembly, rotate and the ribbon is fed.

Figure 2-10 Ribbon feeding

Carriage motor gear

Ribbon intermediate gear

Ribbon take-up

Ribbon transmission gear

gear

assembly

Ribbon drive gear

Ribbon feed roller

Ribbon drive plate

— 33 —

Detection Mechanism Unit

The detection mechanism unit consists of the home position detection, paper detection, and near-end detection (optional) mechanisms.

Home position detection mechanism

The home position detection mechanism consists of the detection protrusion at the left side of the carriage sub assembly and the sensor sub assembly at the left side of the base frame. It determines the home position, identifies the carriage position, and detects carriage sub assembly operation errors.

The sensor sub assembly consists of an LED and photo transistor. When the carriage sub assembly moves, the detection protrusion passes between the LED and photo transistor and blocks the optical axis of the photo transistor, changing the output level of the photo transistor.

The change in the output level is used as a signal to detect the movement of the carriage sub assembly.

Figure 2-11 Detection mechanism unit

Figure 2-12 Home position detection diagram

Paper detector

Home position sensor

Printer side

The light is blocked

The light is not blocked

Carriage sub assembly detection protrusion

Signal level at A

High

Low

+5V

GND

— 34 —

Paper detection mechanism

The paper detection mechanism is located in the paper path. The mechanism provides paper end detection for the paper roll and semi-automatic loading by detecting presence or absence of the paper roll when it is inserted. Since the paper detector switch sub assembly is a micro switch, it is always ON when the paper roll is loaded.

Paper roll near-end detection mechanism (optional)

The near-end detector assembly consists of the near-end detector lever and a microswitch sensor and is located on the right side of the lower case. This detector senses the amount of paper left on the paper roll.

The tip of the near-end detection lever is always pressed against the edge of the paper roll by a spring inside the microswitch. Therefore, when there is a large amount of paper remaining on the roll, the nearend detection lever is pressed against the side of the paper roll as depicted by the solid lines in the figure below. This keeps the microswitch turned on. When the amount of paper left on the roll decreases below a predetermined amount, the tip of the near-end detection lever no longer presses against the side of the roll and moves in the direction indicated by the arrow into the hole in the center of the roll core. This turns the microswitch off and generates a signal indicating that the paper roll is near its end.

Auto-cutter mechanism

The printer executes a partial cut (one point left uncut) by driving the cutter motor.

When the motor is energized from the standby state, the wormwheel rotates in the direction indicated by arrow A through the gears from the motor. The resulting motion of the wheel pin through arm slot C causes the arm to move in direction B. This, in turn, causes slot D to move the

Figure 2-13 Paper roll near-end detection mechanism

Paper roll center

Lower case

Microswitch

Near-end detection lever

Paper roll

— 35 —

movable blade drive pin in direction E to make the blade execute a cut. If the motor continues rotating, the wormwheel makes one rotation and it makes the movable blade return to the standby position and the cutting is finished.

Figure 2-14 Auto-cutter mechanism

Ribbon Switch Mechanism Unit

The ribbon switch mechanism unit consists of the carriage motor assembly, carriage sub assembly, tension plate assembly, tension belt pulley, home position detector assembly, ribbon frame assembly, ribbon frame spring, ribbon switch lever, ribbon release lever, and ribbon release spring. The mechanism unit is placed at the left and right of the carriage sub assembly, whose position is controlled by the number of carriage motor steps, using the home position as the reference position. It switches between the black and red ribbon in the ribbon switch and ribbon release areas outside the printing area.

Switching from Black to Red

When the carriage, sub assembly (print head unit) moves in direction E and reaches the ribbon switch area, the ribbon switch lever is pushed by the ribbon switch section and moved to position A (shown by the dotted lines). The ribbon assembly frame is pushed upward by the push face for the ribbon frame. The detent face for the ribbon switch falls into the ribbon switch lever hole in the ribbon frame assembly and the ribbon frame assembly is set to the red position.

Releasing from Red to Black

When the carriage sub assembly moves in the D direction and reaches the ribbon release area, the ribbon release lever is pushed by the ribbon release section. Then portion C pushes theribbon frame assembly upward. At this time, the detent face for the ribbon switch is released from the ribbon switch lever hole in the ribbon frame assembly and the ribbon switch lever is returned to ribbon switch lever position B (shown by the solid lines) by the spring power of the

Wormwheel

Movable blade drive pin

Slot D

Arm

Wheel pin

Movable blade

— 36 —

ribbon release spring. When the carriage sub assembly moves in the E direction, the ribbon frame assembly and ribbon release lever return to their original positions because of the spring power of the ribbon frame spring.

Electrical Circuitry Operating Principles

Hardware Configuration

Component connection diagram

The electrical circuitry of the printer consists of the main circuit board and the interface circuit boards (UB-S01/RS-232, UB-P01/1284, or UB-S02/RS-485). The figure below is a component connection diagram for the electrical circuitry.

Figure 2-15 Ribbon Switching

Figure 2-16 Component connection diagram

Ribbon switch lever

Ribbon switch lever hole

Detent face for ribbon switch

Push face for ribbon frame

Ribbon release lever

Ribbon release range Ribbon switch range

Ribbon switch section

Ribbon release section

— 37 —

The main circuit board unit contains the following electrical circuits:

❏ Power supply circuit ❏ Reset circuit ❏ CPU [internal RAM: 16K bits (2K x 8 bits)] ❏ Memory [EPROM: 512K bits (64K x 8 bits)] ❏ Operation panel control circuit ❏ Drawer kick-out driver circuit ❏ Print head driver circuit ❏ Paper feed motor driver circuit ❏ DIP switch read circuit ❏ Various detector circuits ❏ Carriage motor driver circuit ❏ Auto-cutter driver circuit

The interface circuit board contains the following:

❏ Reset circuit ❏ Host interface circuit

— 38 —

Circuit board block diagram

The figure below illustrates the circuit block diagram for the printer.

Figure 2-17 Circuit board block diagram

— 39 —

Memory Map

The following parts are mapped on the printer memory map:

❏ CPU ❏ EPROM (program)

Figure 2-18 Memory map

Program, character

generator area

Can not to be used.

(Interral ROM program area)

Can not to be used.

Internal RAM (2KB)

Internal I/O (96bytes)

0000H

FFFFH

F000H

F7A0H

FFA0H

FFFFH

0000H0000H

FFFFH

0000H

FFFFH

0000H

FFFFH

0000H

FFFFH

(For multi-lingual)

Character

generator area

(2)

64KB

(For multi-lingual)

Character

generator area

(1)

64KB

(For multi-lingual)

Character

generator area

(3)

64KB

(For multi-lingual)

Character

generator area

(4)

64KB

Cannot be used

F7A0H

Cannot be used.

— 40 —

Principles of Operation

Power Supply Circuitry

The power supply circuit is compact, uses a switching method, and is attached to the main circuit board. The following sections describe printer power supply circuitry. The following table shows power supply voltages and their usages.

Filter circuit

The +24 V (24 to 30 V) DC power is input from CN1 through the filter circuit, which reduces outside noise and keeps internally generated noise from flowing through the +24 V power line.

+24 VDC circuit

The +24 V power from the filter circuit is input to printer power and the +5 V regulator circuit. Printer power and drawer drive power are the converted +24 ± 1 V that is regulated by series of regulators (U2 to U4).

+5 VDC control circuit

The +5 V regulator circuit switches the +24 V power input and converts it to +5 V. The switching regulator IC (U1) switches the +24 V input, smooths it via C1, and outputs +5 V. Power for the RS-232 is generated by the internal charge-up circuit on the RS-232 interface driver.

Power supply voltage usage

Voltage Usage

+5 V

Logic circuit Interface circuit board Operation panel circuit Various detector circuits

+24 V

Printer: Carriage motor Paper feed motor Print head Auto-cutter Drawer kick-out drive

Figure 2-19 Power supply circuit diagram

— 41 —

Control Circuitry

Reset circuit

The reset circuit is used to prevent the CPU from operating erratically and the print head from printing unexpectedly during the period of unstable voltage immediately after power is turned on. To accomplish this, the OUT terminal output (pin 5) of the reset IC (U9) is supplied to the CPU (U5) as the RESET

input signal (pin 21).

The reset IC (U9) monitors the +5 V voltage. When the voltage is 4.5 V or more, reset is released for the CPU and other components, and the printer becomes ready.

In addition, the C terminal (pin 4) of the reset IC (U9) is connected to the reset signal (DSR signal or pin 25 input signal) from the host interface via DIP switches 2-3 and 2-4. If a reset signal is applied to this pin, reset IC output goes LOW and the CPU and other components are reset.

The reset signals differ, depending on the interface specifications:

RS-232 serial interface: Two signals can be selected (DSR signal or pin 25 input signal). IEEE 1284 parallel interface: Pin 25 must be used for the RESET signal. DIP switch 2-4 is fixed

to ON. The printer can be reset with the Init

signal (pin 31) from

the host.

Figure 2-20 Reset circuit

Pin 29 of CN4 is the reset signal of the IEEE 1284 parallel interface circuit board.

— 42 —

CPU

The printer uses an external 8-bit and internal 16-bit CPU, with an external clock of 14.7 MHz. The CPU (U5) controls the internal processing of the printer according to the printer control program written in EPROM (U8).

CPU pin functions

Pin No.

CPU Function

Signal Name I/O Level Description

1 P57 ELED/DSW9

I/O TTL

ERROR LED. LOW: on. DIP SW 2-1 is read when P100, P101 are LOW.

2 NMI NMI I TTL Not used (connected to +5 V directly).

3P100AC1/DSEL

OTTL

Auto cutter drive (1) and DIP SW read selection. LOW: read (read once after initialization). HIGH: break status when used as motor control port.

4P101AC

OTTL

Auto cutter drive (2) and DIP SW read selection. LOW: read (read once after initialization). HIGH: break status when used as motor control port. This pin must change at the same time as P100.

5 AVCC AVCC I (+5 V) Analog/digital converter standard voltage.

6 AVSS AVSS I (0 V) Analog/digital converter GND terminal.

7 P60/AN0 V DTC I Analog +24 V power voltage detection.

8 P61/AN1 HD TEMP I Analog Head temperature detection.

9P62 NE ITTL

Paper roll near-end detection. LOW: no paper; HIGH: paper present.

10 P63 DK S I TTL Drawer open/closed. LOW: open.

11 P64 RE I TTL

Paper roll end detection. LOW: paper present; HIGH: no paper.

12 P65 HP DTC I TTL

Carriage home position sensor. LOW: home position.

13 P66 DET I TTL Host interface DET.

14 P67 AC RST I TTL Auto cutter position detection (reset).

15 VCC VCC I (+5 V) Main power terminal.

16 P70 CTS

I TTL Host interface CTS. LOW: on.

17 P71 CCE

O TTL 4M ROM CE signal. LOW: active.

18 P72/RXD1 RD I TTL Host interface RD. LOW: on.

19 P73/CLK1 CLK IN/DTR I/O TTL Host interface CLK IN/DTR.

20 P74/TXD1 SD O TTL Host interface SD. LOW: on.

21 RESET

RESET I --- CPU reset input. LOW: on.

22 CLK CLK O TTL Not used. Open.

23 VSS VSS I (0 V) GND terminal.

2/DSEL

— 43 —

24 X1 X1 I ---

Connected to ceramic vibration generator. f=14.74 MHz ± 0.5%.

25 X2 X2 O --- Connected to ceramic. f=14.74 MHz ± 0.5%.

26 EA

EA I TTL

External memory access. LOW: external ROM HIGH: internal ROM (CPU mask).

27 P75 P75 (A16) O TTL External memory address A16 (software).

28 P76 P76 (A17) O TTL External memory address A17 (software).

29 P77 P77 (A18) O TTL External memory address A18 (software).

30 P80 WDTOUT O TTL

Watch dog timer error (and hardware limited time power supply switch). LOW: error (reset).

31 P81/INT0 CLK IN/DTR I TTL Connected to pin #19.

32 P82 PF SW I TTL Paper feed switch. LOW: active.

33 ALE ALE O TTL

Address latch enable signal. Latches address on bus AD0 to AD7 at fall.

34 VCC VCC I (+5 V) Main power terminal (+5 V).

35 AD AD0

3-state TTL

Address/data bus. Transmits address (lower 8 bits) and data.

36 AD AD1

37 AD2 AD2

38 AD3 AD3

39 AD4 AD4

40 AD5 AD5

41 AD6 AD6

42 AD7 AD7

43 A8 A8

O TT LAddress bus (address upper 8 bits).

44 A9 A9

45 A10 A10

46 A11 A11

47 A12 A12

48 A13 A13

49 A14 A14

50 A15 A15

51 VSS VSS I (0 V) GND terminal.

52 P20 CR A/DSW1

I/O TTL

Carriage motor driver control 2-2 phase excitation. All terminals on (LOW): hold. DIP SW 1-1 to 1-4 read when P100, P101 are LOW.

53 P21 CR B/DSW2

54 P22 CR C/DSW3

55 P23 CR D/DSW4

CPU pin functions

Pin No.

CPU Function

Signal Name I/O Level Description

— 44 —

ROM (512K bit)

The printer control program and the character generator data are written in ROM (U8). The control program controls the basic operations of the printer. All CPU (U5) operations follow this program.

56 P90 PF A/DSW5

I/O TTL

Paper feed motor driver control 2-2 phase excitation. All terminals on (LOW): hold. DIP SW 1-5 to 1-8 read when P100, P101 are LOW.

57 P91 PF B/DSW6

58 P92 PF C/DSW7

59 P93 PF D/DSW8

60 RD RD O TTL External memory data read signal.

61 WR WR O TTL External memory data write signal.

62 P32 DKD1

O TTL Drawer kick-out driver signal 1. LOW: active.

63 P33 DKD2 O TTL Drawer kick-out driver signal 2. LOW: active.

64 P40 HEAD8

O TTL Print head #8 driver signal. LOW: on.

65 P41 HEAD7 O TTL Print head #7 driver signal. LOW: on.

66 P42 HEAD6

O TTL Print head #6 driver signal. LOW: on.

67 P43 HEAD5 O TTL Print head #5 driver signal. LOW: on.

68 P44 HEAD4

O TTL Print head #4 driver signal. LOW: on.

69 P45 HEAD3 O TTL Print head #3 driver signal. LOW: on.

70 P46 HEAD2

O TTL Print head #2 driver signal. LOW: on.

71 P47 HEAD1 O TTL Print head #1 driver signal. LOW: on.

72 P48 HEAD9

O TTL Print head #9 driver signal. LOW: on.

73 P51/T04 +24VCOM SW

OTTL

Head, auto cutter, drawer kick-out power switch. LOW: drive.

74 P52 CRCOM SW

OTTL

Carriage motor power switch. LOW: motor drive.

75 VCC VCC I (+5 V) Main power terminal (+5 V).

76 P53 PFCOM SW OTTL

Paper feed motor power switch LOW: motor drive.

77 P54 CLK REQ O TTL HOST interface CLK REQ.

78 VSS VSS I (0 V) GND terminal.

79 P55 RTS O TTL Host interface RTS. LOW: on.

80 P56 PLED/DSW0

I/O TTL

PAPER OUT LED. Low: on. DIP SW 2-2 read when P100 is LOW.

CPU pin functions

Pin No.

CPU Function

Signal Name I/O Level Description

— 45 —

RAM (CPU internal 2K bit)

RAM is used as temporary storage for the following:

❏ Data received from the interface (receive buffer) ❏ Pattern data to be printed by the print head (printer buffer) ❏ Data used by the CPU (U5) during processing (flags, pointers, etc.).

Operation panel

The operation panel is located on the main circuit board and has 3 LEDs ( POWER , ERROR, and PAPER OUT) and 1 switch ( FEED). The POWER LED is driven at the same time as +5 V is supplied by the power supply circuit. The ERROR and PAPER OUT LEDs are driven by U5. Switch detection is also executed by the U5.

Various detector circuits

When the printer detects paper, the paper detector at the paper inlet turns the input signal to the CPU (U5) LOW. This detector also functions as the semi-automatic loading detector.

A home position sensor is provided to detect the print head position. The input signal to the CPU (U5) becomes LOW when home position is detected.

Figure 2-21 Operation panel circuit

P82

C17

R55

Q35 Q36

R56

R41

R54

R15

SW2

1 1 1

222

(PAPER) D12

(ERROR) D11

(POWER) D13

+5V

32 PF SW

1 ELED/DSW9

80 PLED/DSW0

P57/T03

P56/INT3/TI2

GND

— 46 —

A near-end detector is an option that detects the remaining amount of a paper roll. The input signal to the CPU (U5) becomes LOW when a paper near-end is detected.

Host interface circuit

The printer has universal interfaces for connection to the host computer. There are three kinds of interfaces:

❏ EIA/TIA RS-232 intrface ❏ IEEE 1284 interface ❏ EIA/TIA RS-485 interface

See the interface circuit board diagrams in the Appendix.

Drawer kick-out drive circuit

Activating the DKD1 and DKD2 signals from the CPU (U5) causes transistors Q29 and Q30 to turn on. This causes transistor array QM5 to turn on, and the drawer drive signal is output. The drawer status signal DK_S, which indicates whether or not the drawer is open, is input to the CPU (U5), allowing the host to check the status via the interface.

Figure 2-22 Various detector circuits

CN8

CN11

R40

R37

R39

R16

R36

R38

C23C22 C46

R53

Mechanism 1

Mechanism 2

C44

+5V +5R

GND

NEC

HPC

REC

HP DET

P62/AN2

P64/AN4

P65/AN5

GND

+5V

R.E

H.P

N.E

GND

Printer mechanism

+5V

— 47 —

The +24 V drawer power supply is supplied via the regulator IC (U2), which cuts off the supply in case of excessive current.

There are 8 switches in DIP switch bank 1 and 2 switches in DIP switch bank 2 that are statusreadable switches. Each signal is input to the CPU. The signal is read as LOW when the switch is on, and HIGH when the switch is off.

{5 V

R28

{5 V

Q34

C39

Q29

Q30

R48

R47

1 0

QM5

C45

G N D

VI VO

DKD 1P

DKD SW

DKD 2P

CN2

DKD

P32

P33

P63

C16

{5 V

R13

DC 24-30V IN

D46

+5V

+24V

+5V

— 48 —

Figure 2-23 Drawer kick-out drive circuit

DIP switch read circuit

CPU (U5) pins 52 to 55, pins 56 to 59, and pins 1 and 81 are also used for the carriage motor drive circuit, paper feed motor drive circuit, and operation panel control circuit. The pins are used to read DIP switches temporarily immediately after the printer initialization (or the power is turned on).

(*1): Resistance between E and B is used for pull-up resistors in the transistor.

Figure 2-24 DIP switch read circuit

{ 5V

P20 P21

P22

P23 P90

P91

P92

P93

1234 5 768

DSW1

D24 D23 D22 D21 D20 D19 D18 D17

Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q36 Q35

D14 D25

DSW2

P57

P56

R33

{ 5 V

Q39

Q28

Q38

R32

+5 V

R29

{ 5 V

P100

P101

(*1)

+5V

— 49 —

Printer Mechanism Driver Circuits

Print head driver circuit

The head driver signal is output from CPU (U5) pins 64 to 72. Receiving this drive signal, transistor array QM1 and QM2 and transistor array QM3 turn On, Off, and drive the head.

Power supply time to the head is adjusted by the supplied power voltage. The CPU (U5) changes the power voltage between analog and digital at AN0 (pin 7) and decides and controls the head power supply time according to the internal time table.

To prevent damage to the head during excessive printing, a heat sensor has been installed in the print head. An analog-digital conversion of the partial pressure difference between the heat sensor and R18 is carried out in AN1 (pin 8) of the CPU (U5) and the temperature is calculated. If the head is overheating or working improperly, the

ERROR

LED flashes.

Figure 2-25 Print head driver circuit

COM (# 3.5.7 ) # 5 # 7 # 1 # 3

Print head unit

HEAD1

HEAD5

HEAD6

HEAD2

RM3

87 65 43 21

1 0

QM1

+5V

RM4

87 65 43 21

1 0

QM2

Q10

Q11

HEAD3

HEAD7

HEAD9

HEAD8

+24A

Q12

R20

1 2 3

CN7

4 5 6 7 8

9 10 11 12 13 14 15

P44

P45

P41

P50

HEAD4

P43

P42

P46

P47

P40

8 HD TEMP

P61/AN1

7 V DTC

P60/ANO

AVSS

AVCC

C30C31

R45

R46

R18

C19

C29

C33

R19

+24DT

# 9 C0M ( # 1.2.9 ) THEM1 THEM2

# 4 # 6 # 8 COM (# 4.6.8 )

# 2

D27 D28

Q13

+5V

D50

D32

D38

D39

D40

D41

D42

D43

D45

D44

— 50 —

Paper feed motor driver circuit

The paper feed motor (stepping motor) possesses an accurate angle of rotation and permits speed control. It is driven with 2-2 phase excitation. By turning P53 of the CPU to LOW, +24 V (labeled +24C signal in the figure below) is applied to the COM terminal of its coil, and it is made to run by changing P90, P91, P92 and P93 to HIGH and LOW. Its speed is determined by the speed of changing P90, P91, P92, and P93 between HIGH and LOW. At the end of paper feeding, P53 of the CPU is once again set to HIGH.

Carriage motor driver circuit

The carriage motor (stepping motor) possesses an accurate angle of rotation and permits speed control. It is driven with 2-2 phase excitation. By turning P52 of the CPU to LOW, +24 V (labeled +24B signal in the figure below) is applied to the COM terminal of its coil, and it is made to run by changing P20, P21, P22, and P23 to HIGH and LOW. Its speed is determined by the speed of changing P20, P21, P22, and P23 between HIGH and LOW. At the end of paper feeding, P52 of the CPU is once again set to HIGH.

Figure 2-26 Paper feed motor driver circuit

Figure 2-27 Carriage motor driving circuit

RM2

87 65 43 21

Q18

1 0

QM4

1 2 3

CN6

4 5

Q20

Q19

Q21

PF A/DSW5

PF C/DSW7

PF B/DSW6

PF D/DSW8

PF A PF C PF COM PF B PF D

+24C

D10

(ROTOR)

+5V

+24C

P90/M10

P92/M12

P91/M11

P93/M13

Paper feed motor

D35

D33

D34

D37

CR A/DSW1

CR C/DSW3

CR B/DSW2

CR D/DSW4

RM1

87 65 43 21

Q14

1 0

QM3

1 2 3

CN5

4 5

Q16

Q15

Q17

CR A CR C CR COM CR B CR D

+24B

(ROTOR)

+5V

+24B

P20/M00

P22/M02

P21/M01

P23/M03

Carriage motor

D29

D30

D31

D36

— 51 —

Auto-cutter driver circuit

Rotating the DC motor counterclockwise or clockwise causes the auto-cutter to execute a full cut or a partial cut (one point left uncut). The driver IC (U6) has a full-bridge configuration and controls motor rotation, clockwise and counterclockwise.

The position of the auto-cutter blade is detected by the signal connected to P67 of the CPU.

Figure 2-28 Auto-cutter drive circuit

1 2 3

CN9

AC M1 AC M2 GND AC RES

Auto-cutter

C21

+5V

R35

R34

IN1

IN2

+24V

R57

R58

OUTA

GND

P100

P101

TA8428K

4 GND

1 2 3 4

GND

P67

C20

BLOCK (1)

— 52 —

——

Handling Precautions

Storage Precautions

Avoid storing the printer in a dusty, humid, or extremely cold area. Also avoid areas that are exposed to direct sunlight for long periods of time.

For long-term storage, place the printer in a polyethylene bag with anti-rust paper (VCI paper) and keep it in a dry place.

Use Precautions

Always install a ribbon cassette and load paper before printing.

•

If the paper runs out, be sure to load new paper before you resume printing.

•

If you try to print when there is no paper or no ribbon cassette in the printer, the print quality of subsequent print jobs may suffer (the printing color may become uneven, or some dots may not be printed) because of damage to the surface of the platen, printing wires, or ribbon.

❏ Use a ground wire connected to the frame ground (FG) screw to ground the printer.

❏ Be careful when wiring and connecting the interface, power, and drawer kick-out cables to

avoid subjecting the connectors to excessive pressure.

Paper Handling Precautions

❏ Use only paper that meets the paper specifications described in Chapter 1 of this manual.

❏ If the paper used does not meet the required specifications, any of the following may occur:

•

Print quality deterioration

•

Problems in loading paper

•

Paper jams

•

The ribbon may catch on the paper

•

Ink may stain the paper.

❏

Chapter 3 Handling and Maintenance

——

Ribbon Cassette Handling Precautions

❏ Use only the ribbon cassette specified in Chapter 1 of this manual. If another ribbon cassette

is used, any of the following may occur:

●

Print quality deterioration

●

Printer life may be shortened

●

Ink may leak

●

The ribbon may catch on the print head.

❏ Do not re-ink a ribbon. If a ribbon is re-inked:

●

Print quality could deteriorate due to a malfunction of the print wires

●

Ink may leak.

Replacing the Paper Roll

Note:

Be sure to use roll paper that meets the specifications.

1. Turn on the printer.

2. Open the printer cover.

3. Pull the paper and cut the paper at the dotted line shown in the illustration below.

Cut here

Printer cover

——

4. Press the FEED button to remove the cut paper.

5. Remove the used paper roll.

6. Using scissors, cut the leading edge of the paper roll perpendicular to the paper feed direction, as shown below.

7. Insert the paper roll.

Note:

Be sure to note the correct direction that the paper comes off the roll, as shown below.

——

8. Open the auto-cutter by pulling the tab up and toward you.

9. Hold both edges of the paper and insert it straight into the paper slot. The printer feeds the

paper automatically.

10. If the paper is not coming out of the manual cutter, press the paper FEED button until the paper comes out.

——

11. Cut the paper on the manual cutter.

12. Close the auto cutter by using the tab.

13. Close the printer cover.

14. When the PAPER OUT light blinks, press the paper FEED button to set the printer on line.

Note:

The printer is off line until the PAPER OUT light is off.

Replacing the Ribbon Cassette

CAUTION:

Make sure the printer is not receiving data when you replace a ribbon cassette; otherwise, data may be lost.

1. Open the printer cover.

2. Open the auto-cutter by pulling the tab up and toward you.

3. Remove the used ribbon cassette.

4. Turn the ribbon cassette’s knob in the direction of the arrow to take up any slack in the ribbon.

——

CAUTION:

Never turn the ribbon cassette’s feed knob in the opposite direction of the arrow marked on the cassette; otherwise the ribbon cassette may be damaged.

5. Insert the ribbon in the position shown in the illustration below and push the ribbon cassette until it clicks.

Note:

Make sure that the ribbon is installed between the print head and the platen without wrinkles or creases.

——

6. Turn the ribbon cassette’s knob 5 or 6 times in the direction of the arrow again to take up any slack in the ribbon.

——

2. Pull the paper and cut it at the position shown by the dotted line in the illustration below.

3. Remove the paper roll.

4. Open the auto cutter by pulling the tab up and toward you.

5. Remove the jammed paper by pulling it in the direction of paper feeding.

Cut here

Removing Jammed Paper

Follow these steps to clear a paper jam:

CAUTION:

The print head becomes very hot during printing. Allow it to cool before you reach into the printer.

1. Turn the printer off and open the printer cover.

——

Note:

Do not pull the jammed paper in the opposite direction of paper feeding.

6. If paper still remains in the printer, follow the steps below.

7. Remove the ribbon cassette.

8. Loosen the screw securing the print head cover. Turn the screw only until you can tilt it as shown in the illustrious.

——

Note:

Do not remove the screw from the print head cover.

9. Remove the print head cover.

10. Remove all the jammed paper.

Note:

Do not pull the jammed paper in the opposite direction of paper feeding.

11. Replace the print head cover and secure it with the screw.

12. Replace the ribbon cassette and close the auto cutter.

——

13. If the auto cutter blade is not in its normal position (if you can see the blade in the auto cutter

slit, the blade is not in the normal position), insert a screwdriver into the right side of the auto cutter and turn the gear inside to move the blade to the normal position.

14. Replace the paper roll and close the printer cover.

——

Using the Power Switch Cover

You can use the provided power switch cover to protect the power switch from accidental or improper operation. Attach the cover as shown in the illustration below.

You can turn the power on or off with the switch cover attached by inserting a pointed object (like a ball point pen) through either of the two small holes on the switch cover.

CAUTION:

If an accident occurs when the power switch cover is attached, pull the AC adapter cord out of the outlet immediately; otherwise the printer may be damaged.

——

Inspection and Maintenance

Proper performance of the inspection and maintenance procedures described below allows this unit to perform for the years of trouble-free operation for which it is designed.

Maintenance Procedures

The inspection procedures described here are divided between two types: daily inspection, which can be performed by those who use the unit on a daily basis, and periodic inspection, to be performed by individuals who have a more detailed technical knowledge of the unit.

Daily inspection

Inspection item

Setup

Check for proper installation of roll paper and ribbon cassette. Is the ribbon passing along the proper route?

Check the ribbon for damage.

Reconnect any cables that have come loose.

Correctly install roll paper and the ribbon cassette.

Replace the ribbon cassette, if damaged.

Paper particles, paper scraps, foreign matter

Open the roll paper cover and make sure there are no large pieces of paper or other foreign matter present.

Clean out any paper or foreign matter.

Periodic inspection

Checkpoints Standards Remedies

Dust, paper particles, or dirt on and in the printer

No dust, paper particles, or dirt should be allowed to build up on or in the printer.

Clean the printer thoroughly with a vacuum cleaner.

No small pieces of paper should be left in the paper path.

Remove any pieces of paper from the paper path.

Lubrication See the “Lubricants” section. Lubricate the points listed in the

“Lubrication Points” section.

Operation check When each printer component is

checked, no abnormalities should be found.

Check the printer following the Troubleshooting flowcharts in

Chapter 4. Shape of the springs No spring should be bent or deformed. Replace any deformed springs. Ribbon cassette

The ribbon cassette should be properly installed in the printer.

See “Replacing the Ribbon Cassette”

in this chapter.

Check for proper connection of cables.

Action

——

Cleaning

1. Wipe off stains with a clean, dry cloth. If the stains cannot be wiped off, use a neutral detergent.

CAUTION:

Never use benzene, alcohol, thinner, trichloroethylene, or any of the ketone family of solvents because they may deform or damage plastic and rubber components.

2. Thoroughly clean all parts of the printer with a vacuum cleaner.

Note:

Check the amount of lubrication in each cleaned area and lubricate as needed. See “Lubricants” below.

Lubricants

Lubrication is critical to retaining the printer at its initial performance level throughout its product life, as well as avoiding potential problems. Always lubricate at prescribed intervals, using the correct lubricants.

Standard Lubrication

❏ During disassembly and reassembly, clean the parts first, then lubricate them. See the

lubrication points table in this chapter and the lubrication and adhesive points diagrams in the Appendix.

❏ Lubricate or overhaul after every 7.5 million lines printed.

Lubricants

The types of lubricants used greatly affect the printer’s performance and durability, and a lubricant’s low-temperature characteristics require special attention. EPSON has conducted thorough analyses of the technical data and wide-ranging experimentation on different lubricants. The EPSON selection of lubricants prescribed for use with the printer is based on the results of such research. The prescribed EPSON lubricants are available in 40 cc (40 gr) metal cans or plastic containers (the smallest unit of supply).

The two types of lubricants used with this printer are G-31 and O-10.

——

Lubrication Points

The following table describes the lubrication points, type, and class. The numbers in the following table correspond to the numbers in the lubrication and adhesive points diagrams in the Appendix on pages A-7 and A-8.

Tool List

The required tools for this printer are as follows:

❏ Brush #1 ❏ Cleaning brush ❏ Phillips screwdriver No. 1 ❏ Phillips screwdriver No. 2 ❏ Phillips screwdriver No. 2 (with long handle) ❏ Flatblade screwdriver ❏ Pliers ❏ Retaining pliers #2.3 ❏ Thickness gauge (0.50 mm, 0.55 mm, 0.60 mm) ❏ Tweezers ❏ Slanted blade cutter

Lubrication points

No. Lubricant typeLubrication point

(1)

Contact points between the carriage shaft and carriage sub assembly (2 points)

O-10

G-31 G-31 G-31 G-31 G-31

G-31

(2) Ribbon intermediate gear shaft (3) Both ends of the guide roller (4) Both ends of the receive roller (5) Switching points of ribbon switch lever (6) Switching point of ribbon release lever

(7)

Left and right ribbon frame assembly mounting shaft in the base frame assembly

G-31

(8) Middle of the paper hold roller shaft

Lubricants and adhesives list

Lubricants and adhesives

Type/name

Grease/G-31 Oil/O-3

Quantity

40 gr (1.4 oz) 40 gr (1.4 oz)

——

Use the following to troubleshoot and repair the printer:

Self-test

This procedure tests control circuitry (other than serial communication and parallel communication send / receive control) and the printer mechanism.

Troubleshooting flowchart

When the source of the problem is not clear, use the flowchart to find and replace a defective component.

Troubleshooting table

Follow the steps outlined in this table to repair a defect whose symptoms are known.

Self-test

Initiating the Self-test

1. Insert a paper roll and a ribbon cassette in the printer, and close the printer cover.

2. Turn off the printer.

3. Turn on the printer while keeping the FEED button depressed. The self-test starts, and status

information is printed.

Self-test Standby

1. When status information printing is complete, the following is printed:

“Self-test printing. Please press paper FEED button.”

The PAPER OUT LED flashes alternately to indicate the standby condition.

2. Press the FEED button to continue the self-test.

Ending the Self-test

The printer prints “*** completed *** “ and ends the self-test. The printer automatically becomes ready to receive data after the self-test.

Chapter 4 Troubleshooting

——

Troubleshooting Flowchart

If the source of a problem is not clear, use the flowchart below to find and replace the defective component. Normally, perform servicing by component replacement. Repairs of the PCBs and other components should be performed only by technicians.

Execute the self-test

Start

Power on

Is POWER

Is PAPER

Is paper roll in

Is self-test

normal?

END

Replace or insert paper roll.

Yes

LED lit?

OUT LED lit?

near-end condition

or not inserted?

loading executed?

Semi-automatic

Yes

Is ERROR

LED flashing?

Take steps described in “Error types and countermeasures.”

END

Does auto-cutter

perform normally?

Host sends print data

Is printout

Yes

normal?

Yes

——

(See Replacing the fuse in Chapter 5)

Connect power supply cable properly.

Replace external power supply.

Replace Fuse F1

Replace main PCB

OK?

Is power supply

cable connected

properly?

Does external power

supply have proper output

voltage rating? (approximately

+40 V in no-load

condition)

Has fuse F1 on

main PCB blown?

End

Yes

1 POWER LED does not light

Yes

Make sure main PCB does not

have any damage such as burns.

——

roll near end sensor’s

continuity normal?*

Replace the near-

end sensor.

OK?

Replace printer mechanism

assembly.

OK?

Replace main PCB.

END

Is the paper

Yes

2 PAPER LED is lit.

Yes

(*) The near-end sensor is optional.

Turn the power on again.

OK?

Yes

END

(*)

——

OK?

END

Is paper jammed in

the paper inlet path?

Remove the paper.

Is connector CN6

attached firmly?

Attach connector

firmly.

Replace printer mechanism

assembly.

Replace main PCB.

Yes

3 Semi-automatic loading is not executed.

——

(*) Confirm the voltage at each terminal in the table below:

Checkpoint

Pin 3 of U2, U3, U4 R54

Specified value

Approx. 24 V Approx. 5 V

Does the printer not

Replace main PCB.

END

Yes

4 Self-test is not normal.

END

OK?

Yes

perform at all?

Replace printer

mechanism assembly.

Is the output voltage

of the regulator circuit on

the main board within

the specified

range?(*)

END

OK?

END

Replace the mechanism.

Replace the main PCB.

Yes

——

Replace the main

OK?

Replace the auto-cutter unit.

Yes

Is there

Remove jammed paper.

End

OK?

5 The auto-cutter does not perform correctly.

Yes

a paper jam in

the auto-cutter?

circuit board.

Turn on the power again.

Disassembly of the auto-cutter unit is prohibited. If you disassemble it, performance cannot be guaranteed.

——

Replace printer

End

OK?

Replace interface PCB.

Yes

Set DIP switch 1–1 to OFF.

Send data from host to printer.

Is “?” printed?

Are serial

interface parameters

set to identical values at

host and printer?

Make settings identical.

Replace with a proper cable.

Connect the interface

End

OK?

6 Data from host is not printed normally.

Yes

Does

interface

cable match

specifications?

Yes

connected to the

main PCB

firmly?

interface PCB

PCB firmly.

mechanism assembly

Yes

(*)

(*) Dotted line indicates

the process of checking problems for the serial interface.

——

Troubleshooting Tables

The tables contain the following columns: ❏ Problem

This is a symptom that can be verified.

❏ Probable cause

This is a listing of one or several possible causes that should be examined.

❏ Level

Level A

general knowledge, but special technical skills are not required.

Level B

The problem can be corrected by persons familiar with the printer who have

The problem requires thorough knowledge and familiarity with the printer as

well as technical skills and experience.

❏ Checkpoint

These are one or more areas in the printer that should be checked.

❏ Action

These are the steps to correct the problem. If the problem persists after taking these steps, check the other possible causes listed.

Table 4-1 Troubleshooting table for printer operation failure

Problem Checkpoint ActionLevelProbable cause

The POWER LED does not light when the power is on.

The AC adapter may be bad.

Check output voltage of the AC adapter (approximately +40 VDC with no load).

Replace the AC adapter.

The fuse may be blown.

Check if fuse F1 on the main circuit board assembly

is blown.

Replace fuse F1. (See “Replacing the Fuse” in Chapter 5.)

Check if fuse (R42) on the main circuit board assembly is blown

Replace the main circuit board.

The main PCB may be bad.

The cause is none of the above.

Replace the main PCB.

The printer does not print the self test.

The main PCB may be bad.

Check the self test using another main circuit board unit.

Replace the main PCB.

The FEED button may be bad.

Check the continuity of the FEED button (SW2).

Replace SW2.

The printer mechanism assembly may be bad.

The cause is none of the above.

Replace the mechanism assembly.

——

Data from the host is printed incorrectly.

An incorrect interface cable may be used.

A Check if the interface cable

matches the printer specifications.

Use the correct interface cable.

For the serial interface models, the printer DIP switch settings do not match the host settings.

Check if the printer DIP switch

settings match the host settings.

Change the printer DIP switch settings or host settings so that they match.

The main circuit board unit may be bad.

Check the printer using another

main circuit board unit.

Replace the main circuit board unit.

The mechanism assembly may be bad.

B The cause is none of the

above.

Replace the mechanism assembly.

The PAPER OUT LED does not correctly indicate the

status of the paper roll.

The near-end detector assembly may be bad. (The near-end detector is

an option.)

Check the signal of the near-

end detector assembly.

Replace the near-end detector assembly.

The printer is not initialized (home position detection error).

The connector is not inserted correctly.

A Check if the pins of CR motor

cable are inserted in connector

CN5 of the main circuit board unit.

Reinsert the connector.

The carriage motor assembly may be

bad.

B Check the continuity of each

terminal.

Replace the carriage motor assembly.

The carriage motor may be bad.

B The cause is none of the

above.

Replace the carriage motor assembly.

The home position detector assembly

may be bad.

Using an oscilloscope, check

if the detection signal is output when the print head unit passes above the home position detector assembly.

Replace the home position detector assembly.

Table 4-1 Troubleshooting table for printer operation failure (continued)

Problem Checkpoint ActionLevelProbable cause

——

Semi-automatic loading is not executed. (Paper is not fed.)

The paper supply operation may be incorrect.

Check if the paper roll

meets printer specifications.

Use the correct paper roll. (See “Paper Specifications” in Chapter 1.)

The paper path may be incorrect.

Check if the paper supply path is blocked by paper particles or foreign materials.

Remove any pieces of paper, paper particles, or foreign materials.

The connector is not inserted correctly.

Make sure the PF motor cable pins are inserted in connector CN6 of the main circuit board.

Reinsert the connector.

The paper feed motor may be bad.

Check if the motor rotates

during semi-automatic loading.

Replace the paper feed motor.

The paper hold roller assembly may be worn.

Check if the paper hold rollers are worn or damaged.

Replace the paper hold roller assembly.

The gears may be worn or damaged.

Check if the paper feed reduction gear and paper feed gear are worn or damaged.

Replace any worn or damaged parts.

The paper detection switch assembly may be bad.

Using an oscilloscope, check if the detection signal is output when roll paper is inserted.

Replace the paper detection switch assembly.

Table 4-2 Troubleshooting table for bad printing

Problem

The printer does not print. (The carriage motor operates, but nothing is printed, or the print color is light.)

The ribbon in the ribbon cassette may be bad.

Check if the color of the

ribbon is faded or the ribbon is wrinkled or torn.

Replace the ribbon cassette.

The platen gap may be incorrect.

Check the platen gap

(standard: 0.55 mm ± 0.05 mm).

Adjust the platen gap. (See “Adjustments” in Chapter 5.)

The common wire of the print head unit may be bad.

Check the continuity of the

common wire.

Replace the print head unit.

The head flexible plastic cable (FPC) may be bad.

Check the continuity of the

common line.

Replace the head FPC.

Dots are missing continuously. (A specific dot is not printed.)

The head FPC may be bad.

Check the continuity of the

head FPC.

Replace the head FPC.

The drive coil of the print head unit may be bad.

Using a meter, check the

resistance of the corresponding drive coil. (Standard: 19.2 ohms ± 5%)

Replace the print head unit.

The dot wires of the print head unit may be bad.

Check if the dot wires are

broken.

Replace the print head unit.

Table 4-1 Troubleshooting table for printer operation failure (continued)

Problem

Probable cause

Action

Checkpoint

Level

——

Dots are missing occasionally.

The head FPC may be bad.

Check the continuity of the

head FPC.

Replace the head FPC.

The print head unit may be bad.

Check if there are paper

particles or ink on the tips of the dot wires of the print head unit.

Remove any paper particles or ink, or replace the print head unit.

The print head unit may be worn.

The cause is none of the

above.

Replace the print head unit.

The character width is incorrect.

Paper particles or foreign substances may be attached to gears, belt driving pulley, or the belt.

Check if any paper particles

or foreign substances are attached to the belt driving pulley, belt tension pulley, and belt.

Remove any paper particles or foreign substances.

The gears, belt driving pulley, or the belt may be damaged or worn.

Check for wear and damage

in the belt driving pulley, belt tension pulley, and belt.

Replace any worn or damaged parts.

Paper is not fed.(Printing is performed on one line.)

The operation of the paper supply may be incorrect.

Check if the specified paper

roll is used.

Use the correct paper roll. (See “Paper Specifications” in Chapter 1.)

The paper path may be incorrect.

Check if the paper supply

path is blocked.

Remove paper particles and foreign substances.

The connector is not inserted correctly.

Make sure that the PF motor

cable pins are inserted in connector CN6 of the main circuit board.

Reinsert the connector.

The paper feed roller may be bad.

Check for wear and damage

on the surface of the roller.

Replace the paper feed roller.

The paper hold roller assembly may be worn or damaged.

Check for wear and damage

to the rollers of the paper hold roller assembly.

Replace the paper hold roller assembly.

Paper is not fed. (Printing is performed on one line.)(cont.)

Gears may be worn or damaged.

Check for wear and damage

to the paper feed reduction gear and paper feed gear.

Replace any worn or damaged parts.

Paper feed motor assembly may be bad.

Check the continuity of the

PF motor cable assembly.

Replace the paper feed motor cable assembly.

The paper feed motor may be bad.

The cause is none of the

above.

Replace the paper feed motor.

Table 4-2 Troubleshooting table for bad printing (continued)

Problem Probable cause Level Checkpoint Action

——

The paper feed pitch is not uniform.

Operation of the paper supply may be incorrect.

Check if the specified paper

roll is used.

Use the correct paper roll.

(See “Paper Specifications”

in Chapter 1.)

The paper path may be incorrect.

Check if the paper supply

path is blocked.

Remove paper particles and foreign substances.

The connector is not inserted correctly.

Make sure the PF motor cable

pins are inserted in connector CN6 of the main circuit board.

Reinsert the connector.

The paper feed roller may be worn or damaged.

Check for wear and damage

on the surface of the roller.

Replace paper feed roller.

The paper hold roller assembly may be bad.

Check if the paper hold roller

assembly rotates smoothly.

Clean and lubricate the paper hold roller assembly or replace it.

The paper hold roller assembly may be worn or damaged.

Check for wear and damage

to the rollers of the paper hold roller assembly.

Replace the paper hold roller assembly.

Gears may be worn or damaged.

Check for wear and damage

to the paper feed reduction gear and paper feed gear.

Replace any worn or damaged parts.

The printer prints, but the ribbon is not fed.

The ribbon cassette may be loose.

Check if the ribbon cassette is

installed correctly.

Install the ribbon cassette correctly. (See “Replacing the Ribbon Cassette” in Chapter 3.)

The ribbon cassette may be bad.

Check if the ribbon is fed by

rotating the ribbon-tightening knob.

Replace the ribbon cassette.

The ribbon drive plate assembly may be bad.

Check if the ribbon drive plate

assembly moves smoothly.

Replace the ribbon drive plate assembly.

The clutch portion of ribbon take-up assembly may be worn.

Check whether the ribbon

moves smoothly when you turn the upper portion of the ribbon take-up assembly.

Replace ribbon take-up assembly.

Gears may be worn or damaged.

Check if the ribbon drive

assembly, ribbon intermediate gear, ribbon transmission gear, and ribbon take-up assembly are worn or damaged.

Replace any worn or damaged parts.

Check if any foreign

substances are attached to gears.

Remove the foreign substances.

Table 4-2 Troubleshooting table for bad printing (continued)

Problem Checkpoint ActionLevelProbable cause

——

The print color is mixed. (Half of the character is black and the other half is red.)

The ribbon cassette is floating.

Verify that the ribbon cassette

is mounted correctly.

Mount the ribbon cassette in the correct position. (See “Replacing the Ribbon Cassette” in Chapter 3.)

The ribbon is placed incorrectly.

Verify that the ribbon is not

placed between the print head mask assembly and paper feed frame assembly.

Place the ribbon between the print head unit and print head mask assembly.

The ribbon frame assembly is deformed.

Verify that the ribbon frame

assembly is not deformed.

If deformed, replace the ribbon frame assembly.

The ribbon is defective.

Verify that the color of the

ribbon is not blurred, or the ribbon is not rumpled or worm

Replace the ribbon cassette if the ribbon is worn or the print color is light.

Color does not change. (Black to red or red to black.)

The ribbon release spring is unhooked or damaged.

Verify that the ribbon release

spring is not unhooked or damaged.

If the spring is unhooked, hook it back on. If it is damaged, replace it.

The ribbon frame spring is unhooked or damaged.

Verify that the ribbon frame

spring is not unhooked or damaged.

If the spring is unhooked, hook it back on. If it damaged, replace it.

Table 4-2 Troubleshooting table for bad printing (continued)

Problem ActionCheckpointLevelProbable cause

——

Error Types and Countermeasures

Follow the flowcharts on the next page based on the ERROR LED blinking patterns in the table below and repair the printer. The printer does the following when an error occurs:

❏ All operations stop ❏ The printer goes off-line (when DIP SW 1-8 is off). ❏ The ERROR LED blinks.

ERROR LED blinking patterns

ERROR LED Blinking PatternError Error Description Action

(1) Head high temperature

error (*1)

Print head temperature is too high.

(2)Home position

(7) Auto-cutter

error

Action 1

Action 2

Action 3

Action 4

Action 3

Action 4

160 ms

detection error

Home position cannot be detected due to a paper jam or other problem.

Print head temperature is out of normal operating range.

(3) High-voltage error

(4) Low-voltage error

(5) CPU execution error

(6) Print head temperature detection error.

Abnormality occurs in the auto-cutter.

CPU is trying to execute an invalid address.

Power supply voltage is too low.

Power supply voltage is too high.

(*1) This error can occur for a short time during normal printing, when the print head reaches a high temperature. No repair is necessary in this case.

Approx. 2.56 sec

** See troubleshooting flowchart.

——

Action 1

Wait for the print head temperature to drop.

printer recovered

from the error?

Replace main PCB.

Yes

END

OK?

Action 1

Yes

Replace printer mechanism assembly.

Has the

——

Action 2

Yes

Is connector CN5

Remove paper.

Insert the connector

OK?

END

OK?

END

Replace main PCB.

Action 2

Yes

END

Yes

inserted firmly?

firmly.

Replace printer

mechanism assembly.

Are there

any chips of paper

in the home position

sensor?

——

END

Yes

Action 3

Turn the printer power off.

Does external power

supply have proper output

voltage rating? (approx. 40 V

in no-load condition)

Replace external

power supply.

Replace main PCB.

Replace printer mechanism assembly.

OK?

Action 3

Yes

——

END

Yes

Action 4

Replace main PCB.

Replace printer

OK?

Action 4

mechanism assembly.

——87

Small Part Specifications

This section uses abbreviations for small parts, such as screws and washers. The following is a list of these abbreviations and illustrations of the screw types.

❏ CCS-tite Cross-recessed Cup head S-tite self-tapping screw

❏ CBS-tite Cross-recessed Binding head S-tite self-tapping screw

❏ CBB-tite Cross-recessed Binding head B-tite self-tapping screw

❏ CBT-B Cross-recessed Binding head self-tapping screw not fluted class 2

❏ CP(O) Cross-recessed Pan head screw with outside toothed lock washer

❏ CPS-tite Cross-recessed Path head S-tite self-tapping screw

❏ CPS-tite(O) Cross-recessed Pan head S-tite screw with outside toothed lock washer

❏ CPS-tite(S-P4) Cross-recessed Pan head S-tite self-tapping screw with Spring lock washer

and plain washer

❏ CPT-B Cross-recessed Pan head self-tapping screw not fluted class 2

❏ CPP-tite Cross-recessed Pan head P-tite self-tapping screw

Head (top) Head (side) Body Washer (assembled) C (Cross) P (Pan)

B (Bind)

C (Cup)

S-tite

T-B

B-tite

P-tite

(O)

Chapter 5 Disassembly, Assembly, and Adjustment

—— 88

Disassembly

Removing the fuse

1. Turn off the printer.

2. Disconnect the external power supply.

3. Remove the main cover assembly from the printer.

4. Remove the lower plate from the printer.

5. Use tweezers to remove the blown fuse.

6. Replace the fuse with a 125 V, 2.0 AT Littelfuse 154002T.

CPS-tite (M3x6) [0.59 to 0.78 N • m (6 to 8 kgf • cm)]

Fuse

—— 89

Removing the print head unit

1. Remove 4 screws, and remove the upper case.

2. Remove the right side screw securing the auto-cutter fixing plate.

3. Loosen the thumb-screw and remove the head cover.

Upper case

Auto-cutter

fixing plate

screw

Thumb-screw

Head cover

4. Remove the ribbon frame spring and ribbon frame fixing plate; then remove the ribbon frame assembly.

5. Remove the screw seuring the print head unit.

6. Disconnect the print head FPC and remove the print head unit.

Refer to the corresponding assembly section(s) in this chapter for the assembly procedure.

Ribbon frame

fixing plate

Ribbon frame

assembly

Ribbon frame spring

Print head unit

Print head FPC

—— 90

—— 91

Removing the auto-cutter

1. Open the main cover assembly.

2. Remove 1 screw, and remove the auto-cutter cover. Remove the cable connector from the auto-cutter cover (See the second part of the illustration below). Then disconnect the autocutter cable from the cable connector for the auto-cutter.

(The illustration does not have the main cover assembly. However, it’s not necessary to remove it.)

3. Remove 2 REs.

4. Remove the auto-cutter plate shaft, auto-cutter plate spring shaft, and auto-cutter plate spring. Then remove the auto-cutter.

Auto-cutter cable

Auto-cutter cover

screw

Connector

Auto-cutter

plate spring

Auto-cutter

plate spring shaft

Auto-cutter plate shaft

Casio UP-250 Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual