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Table 4-2 Troubleshooting table for bad printing Continued

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Table 4-2 Troubleshooting table for bad printing (Continued) Problem Probable cause Level Checkpoint Action Paper is not fed. (Printing is performed on one line.) (cont.) Gears may be worn or damaged. Motor, paper feed ass'y may be bad. The Motor, paper feed may be bad. Check the wear and damage B of the Gear, paper feed reduction and Gear, paper Replace any worn or damaged parts. feed. B Check the continuity of the PF Replace the Motor, paper motor cable ass'y. feed cable ass'y. B The cause is none of the above. Replace the Motor, paper feed. The operation of the paper supply may be incorrect. A 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. A Check if the paper supply path Remove paper particles is blocked. and foreign substances. The connector is not inserted correctly. Make sure that the pin of the PF A the motor cable is inserted in the connector CN6 of the Main Reinsert the connector. circuit board. The paper feeding pitch is not uniform. The Roller, paper feed may be worn or damaged. The Roller, paper hold ass'y may be bad. B Check the wear and damage Replace Roller, paper of the surface of the roller. feed. B Check if the Roller, paper hold ass'y rotates smoothly. Clean and lubricate the Roller, paper hold ass'y or replace it. The Roller, paper hold ass'y may be worn or damaged. B Check the wear and damage of the rollers of the Roller, paper hold ass'y. Replace the Roller, paper hold ass'y. Gears may be worn or damaged. Check the wear and damage B of the Gear, paper feed reduction and Gear, paper Replace any worn or damaged parts. feed. The ribbon cassette may be loose. Install the ribbon cassette A Check if the ribbon cassette is correctly. (See "Replacing installed correctly the Ribbon Cassette" in Chapter 3.) The ribbon cassette may be bad. A Check if the ribbon is fed by rotating the ribbon-tightening knob. Replace the ribbon cassette. The printer prints, but the ribbon is not fed. The Plate,ribbon drive ass'y may be bad. The clutch portion of Ribbon take-up ass'y may be worn. B Check if the Plate, ribbon drive Replace the Plate, ribbon ass'y moves smoothly. drive ass'y. Check if the ribbon does not B move smoothly when you turn Replace Ribbon take-up the upper portion of the Ribbon ass'y. take-up ass'y. Gears may be worn or damaged. Check if the Ribbon drive ass'y, B Gear, ribbon intermediate, Gear, ribbon transmission, and Ribbon take-up ass'y are worn Replace any worn or damaged parts. or damaged B Check if any foreign substances are attached to the gears. Remove the foreign substances. 4-12 Troubleshooting Rev.B

Section	Page
Using this online technical guide	1
U200D/U200PD Technical Manual	2
FCC CLASS A	5
FCC Compliance Statement	5
Revision Sheet	8
Chapter 1 Features and General Specifications	13
Features	14
Printing Specifications	14
Character Specifications	15
Paper	17
Paper Roll Supply Device	18
Receive Buffer	18
Electrical Specifications	19
Ribbon Cassette	19
External Dimensions and Weight	20
Environmental Specifications	20
Reliability	21
Safety and EMI Standards Applied	21
Printer Installation Stance	21
Hardware Configuration	22
Main Unit Specifications	23
Motor, Paper Feed	23
Motor, Carriage	23
Print Head Unit	23
Detector Sub-ass’y	23
Paper Detector Switch Sub-ass’y	24
Near-end Detector (N.E.-U200); (Optional)	24
Connectors	24
Interface Connector	24
Power Supply Connector	25
Drawer Kick-Out Connector	25
Interface	27
RS-232 Serial Interface	27
Interface Connector Pin Assignments	28
RS-485 Serial Interface (option)	30
IEEE 1284 Parallel Interface	30
Reverse Mode (Data Transmission from Printer to Ho...	30
Interface Connector Pin Assignments	32
Buttons and Switches	35
Power Switch	35
Panel Button	35
DIP Switches	36
Panel LEDs	38
Self-test	38
Performing the Self Test	38
Error Processing	39
Printer Operation When an Error Occurs	39
Data Receive Error	39
Buffer Full Printing	39
Detectors and Printing	39
Hexadecimal Dump	40
Hexadecimal Dump Function	40
Performing a Hexadecimal Dump	40
Options	40
External Power Supply PS-170	41
Features	42
Printer Mechanism Operating Principles	42
Print mechanism unit	43
Print head unit movement	44
Wire movement when a single dot is printed	44
Printing a character (9x9 font)	45
Paper Feed Mechanism Unit	46
Paper loading (semi-automatic loading)	47
Paper feeding	47
Ribbon Feed Mechanism Unit	48
Ribbon feeding	49
Detection Mechanism Unit	50
Home position detection mechanism	50
Paper detection mechanism	51
Near-end detection mechanism (optional)	51
Ribbon Switch Mechanism Unit	51
Switching from Black to Red	52
Releasing from Red to Black	52
Electrical Circuitry Operating Principles	53
Hardware Configuration	53
Principles of Operation	57
Power Supply Circuitry	57
Control Circuitry	58
CPU	59
Various detector circuits	63
Host interface circuit	64
DIP switch read circuit	65
Printer Mechanism Drive Circuit	66
Print head drive circuit	66
Chapter 3 Handling and Maintenance	68
Handling Precautions	68
Storage Precautions	68
Use Precautions	68
Paper Handling Precautions	68
Ribbon Cassette Handling Precautions	69
Replacing the Paper Roll	69
Replacing the Ribbon Cassette	71
Removing Jammed Paper	73
Using the Power switch cover	75
Maintenance	75
Periodic Checks	75
Cleaning	76
Lubricants	76
Lubrication Standard	76
Lubricants	76
Lubrication Points	77
Chapter 4 Troubleshooting	79
Self-test	79
Initiating the Self-test	79
Self-test Standby	79
Ending the Self-test	80
Troubleshooting Flowchart	81
Troubleshooting Tables	87
Error Types and Countermeasures	92
Chapter 5 Disassembly, Assembly, and Adjustment	97
Small Part Specifications	97
Disassembly	98
Removing the fuse	98
Sub-assembly A	99
Frame, paper feed unit ass’y	99
Main Assembly 1	104
Lever, ribbon switch , Spring, ribbon release , Le...	104
Main Assembly 2	106
Tension plate ass’y	106
Main Assembly 3	106
Frame, paper feed ass’y	106
Main Assembly 4	107
Motor, carriage ass’y	107
Main Assembly 5	108
Carriage sub-ass’y	108
Main Assembly 6	109
Shaft, carriage ass’y	109
Main Assembly 7	110
Shaft holder, adjusting roller	110
Main Assembly 8	111
Shaft, carriage guide ass’y	111
Main Assembly 9	111
Spring, belt tension ass’y	111
Main Assembly 10	112
Detector sub-ass’y	112
Main Assembly 11	113
Radiating plate,, carriage motor	113
Main Assembly 12	114
FFC, print head ass’y ( Single-color Print Version...	114
FPC, print head ass’y (2-color Print Version only)...	115
Main Assembly 13	116
Print head ground plate and Print head unit (Singl...	116
Print head unit (2-color Print Version only)	117
Main Assembly 14	119
Fame, ribbon knob and Frame, ribbon ass’y (Single-...	119
Main assembly 15	120
Fixing plate, cover, left and Fixing plate, cover,...	120
Main Assembly 16	121
Earth plate, ribbon frame (2-color Print Version o...	121
Main Assembly 17	122
Frame, ribbon ass’y , Spring, ribbon frame and Fix...	122
Main Assembly 18	123
Thumb-screw and Cover, head (2-color Print Version...	123
Main Assembly 1 (Case Unit)	124
Plate, cutter, lower	124
Main Assembly 2 (Case Unit)	125
Plate, upper	125
Main Assembly 3 (Case Unit)	126
Main circuit board ass’y	126
Main Assembly 4 (Case Unit)	128
Inserting the cables	128
Main Assembly 5 (Case Unit)	128
Case, lower	128
Main Assembly 6 (Case Unit)	130
Manual cutter	130
Main Assembly 7 (Case Unit)	131
Paper roll receive rollers , Case, upper , Roller,...	131
Main Assembly 8 (Case Unit)	133
Interface circuit board ass’y and Connector plate	133
Main Assembly 9 (Case Unit)	134
Plate, lower , Cover, ROM , and Rubber foot	134
Main Assembly 10 (Case Unit)	136
Caution seal AB (Single-color Print Version only)	136
Main Assembly 11 (Case Unit)	137
Cover, main and Hinge ass’y (There are two type pr...	137
Near-end detector ass’y(N.E-U200); (optional)	140
Adjustment	142
Platen gap adjustment	142
Appendix	149
RS-485 Serial Interface	149
XON/XOFF Transmit Timing	152
Data Format When Using RS-485	152
Main Circuit Board A Parts Layout	154
Main Circuit Board C Parts Layout	155
RS-232 Serial Interface Circuit Board Parts Layout...	156
IEEE 1284 Parallel Interface Circuit Board Parts L...	157
RS-485 Serial Interface Circuit Board Parts Layout...	158
Case Unit Overall Exploded Diagram (2-color Print ...	166
Printer Mechanism Unit Lubrication Points Diagram ...	167
Case Unit Lubrication Points Diagram (2-color Prin...	168

Match case Limit results 1 per page

4-12

Troubleshooting

Rev.B

Paper is not fed.

(Printing is

performed on

one line.)

(cont.)

Gears may be worn or

damaged.

Check the wear and damage

of the Gear, paper feed

reduction and Gear, paper

feed.

Replace any worn or

damaged parts.

Motor, paper feed

ass’y may be bad.

Check the continuity of the PF

motor cable ass’y.

Replace the Motor, paper

feed cable ass’y.

The Motor, paper feed

may be bad.

The cause is none of the

above.

Replace the Motor, paper

feed.

The paper

feeding pitch is

not uniform.

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 pin of the PF

the motor cable is inserted in

the connector CN6 of the Main

circuit board.

Reinsert the connector.

The Roller, paper feed

may be worn or

damaged.

Check the wear and damage

of the surface of the roller.

Replace Roller, paper

feed.

The Roller, paper hold

ass’y may be bad.

Check if the Roller, paper hold

ass’y rotates smoothly.

Clean and lubricate the

Roller, paper hold ass’y or

replace it.

The Roller, paper hold

ass’y may be worn or

damaged.

Check the wear and damage

of the rollers of the Roller, paper

hold ass’y.

Replace the Roller, paper

hold ass’y.

Gears may be worn or

damaged.

Check the wear and damage

of the Gear, paper feed

reduction and Gear, paper

feed.

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 Plate,ribbon drive

ass’y may be bad.

Check if the Plate, ribbon drive

ass’y moves smoothly.

Replace the Plate, ribbon

drive ass’y.

The clutch portion of

Ribbon take-up ass’y

may be worn.

Check if the ribbon does not

move smoothly when you turn

the upper portion of the Ribbon

take-up ass’y.

Replace Ribbon take-up

ass’y.

Gears may be worn or

damaged.

Check if the Ribbon drive ass’y,

Gear, ribbon intermediate,

Gear, ribbon transmission, and

Ribbon take-up ass’y are worn

or damaged

Replace any worn or

damaged parts.

Check if any foreign

substances are attached to the

gears.

Remove the foreign

substances.

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

Problem

Probable cause

Level

Checkpoint

Action