Seiko DPU-414 User manual

DPU-414
SERIAL THERMAL PRINTER
SERVICE MANUAL
U00100139501
Seiko Instruments Inc.

ii
DPU-414 SERVICE MANUAL
Document Number U00100139501
First Edition December 1996
Second Edition January 2006
Copyright 1996,2006 by Seiko Instruments Inc.
All rights reserved.
Seiko Instruments Inc. (SII) has prepared this manual for use by Sll personnel,
Iicensees, and customers. The information contained herein is the property of Sll and
shall not be reproduced in whole or in part without the prior written approval of SII.
Sll reserves the right to make changes without notice to the specifications and
materi-als contained herein and shall not be responsible for any damages (including
consequential) caused by reliance on the materials presented, including but not
limited to typographical, arithmetic, or listing errors.
Sll is a trademark of Seiko Instruments Inc.

iii
TABLE OF CONTENTS
Section Page
CHAPTER 1
GENERAL SPECIFICATIONS...................................1-1
1.1 PRINTER SPECIFICATIONS ............................................................1-1
1.2 THERMAL PAPER SPECIFICATIONS ........................................... 1-2
1.3 BATTERY PACK (OPTION) SPECIFICATIONS ............................. 1-3
1.4 AC ADAPTER (OPTION) SPECIFICATIONS ........ ............................1-3
CHAPTER 2
DISASSEMBLY..............................................2-1
CHAPTER 3
ADJUSTMENT...............................................3-1
3.1 ADJUSTING THE APPLIED ENERGY FOR THE THERMAL HEAD .3-1
3.2 ADJUSTING THE CHARGING TIME FOR THE BATTERY ............ 3-4
CHAPTER 4
TROUBLESHOOTING.........................................4-1
CHAPTER 5
CIRCUIT DIAGRAM ..........................................5-1
5.1 MAIN BOARD CIRCUIT DIAGRAM ...................................................5-2
5.2 SWITCH BOARD CIRCUIT DIAGRAM ........................................... 5-5
CHAPTER 6
BOARD DIMENSIONS ........................................6-1
6.1 MAIN BOARD DIMENSION ............................................................ 6-2
6.2 SWITCH BOARD DIMENSION ....................................................... 6-3
CHAPTER 7
PARTS LIST ................................................7-1
CHAPTER 8
PACKING SPECIFICATIONS...................................8-1

iv
TABLES
Table Page
1-1 Printer Specifications ...................................................................... 1-2
1-2 Thermal Paper Specifications ......................................................... 1-3
1-3 Battery Pack (OPTION) Specifications ........................................... 1-3
1-4 AC Adapter (OPTION) Specifications ...............................................1-3
7-1 Parts List ...........................................................................................7-3
8-1 Packing List .......................................................................................8-3
FIGURES
Figure Page
2-1 Remaining the Screws of the Upper Cover.........................................2-1
3-1 Head Rank Mark ...............................................................................3-1
5-1 Main Board Circuit Diagram (1/3) ......................................................5-2
5-2 Main Board Circuit Diagram (2/3) .......................................................5-3
5-3 Main Board Circuit Diagram (3/3) .................................................... 5-4
5-4 Switch Board Circuit Diagram ...........................................................5-5
6-1 Main Board Wiring Pattern (Heads side) ......................................... 6-2
6-2 Main Board Wiring Pattern (Tails side) ............................................ 6-2
6-3 Main Board Parts Layout (Heads side) ........................................... 6-3
6-4 Main Board Parts Layout (Tails side) .............................................. 6-3
6-5 Switch Board Dimensions ............................................................... 6-4
7-1 Parts Developments ..........................................................................7-2
8-1 Packing Materials Developments ......................................................8-2

1-1
CHAPTER 1
GENERAL SPECIFICATIONS
1.1 PRINTER SPECIFICATIONS
Table 1-1 Printer Specifications
Item Specification
Model number DPU-414-30B -E
Print method Thermal serial dot method
Image mode selection Swichable to character mode or bit-image
graphic mode through program.
Fonts
JIS special patterns: 222 kinds
International (Country) characters: 28 kinds
Special characters: 6 kinds
Total: 256 kinds
Total number of dots 9 x 320 dots / Iine
Character matrix 9 dot high x 7 dot wide
Character dimension 2.47 x I .88 mm: at 40 column (normal)
2.47 x 0.94 mm: at 80 column (condensed)
Columns 40 column (normal)
80 column (condensed)
Line space Programable (default: 6 dots)
Printing direction Unidirectional or bidirectional logical seek
Character mode
specifications
Printing speed Max. 52.5 cps (normal)
Max. 80 cps (condensed)
Total number of dots 8 x 320 dots / Iine (single density)
8 x 640 dots / Iine (double density)
Horizontal dot pitch 0.28 mm (single density)
0.14 mm (double density)
Vertical dot pitch 0.28 mm
Printing width 89.6 mm
Bit-image graphics
mode specifications
Printing direction Unidirectional logical seek

1-2
Table 1-1 Printer Specifications (Continued)
Item Specification
Life 500 thousand lines or over
(“8” 40 digit continuous printing)
Interface 8-bit parallel and RS-232C serial
External dimensions 160 mm x 170 mm x 66.5 mm
Mass approx. 580 g
(excluding the battery pack and thermal roll paper)
Operating
temperature 0 to 40 °C (32 to 104 °F)
Strage
temperature -20 to +60 °C (-4 to 140 °F)
Operating
humidity 30 to 80 % RH (non-condensing)
Environmental
conditions
Strage humidity 5 to 90 '% RH (non-condensing)
Charging time approx. 10 hours through the AC adapter at power
OFF the printer.
Chargeable
battery Battery life approx. 3,000 Iines in character printing.
Serial interface RDED-9SE-LN (Hirose) or equivalent
Parallel interface 57LE-40360-7700 (D29) (DDK) or equivalent
Connectors
(printer side) Power
(AC adapter) HEC0470-01 -630 (Hosiden) or equivalent
Input buffer 28 Kbytes
1.2 THERMAL PAPER SPECIFICATIONS
Table 1-2 Thermal Paper Specifications
Item Specification
Product No. TP411 -28CL (TP-411 L)
Type Normal thermal paper
Paper width 112 mm
Roll external diameter 48 mm (maximum)
Paper length approx. 28 m
Paper thickness 64 ±4 µm

CHAPTER 1 GENERAL SPECIFICATIONS
1-3
1.3 BATTERY PACK (OPTION) SPECIFICATIONS
Table 1-3 Battery Pack (OPTION) Specifications
Item Specification
Product No. BP-4005-E
Battery type Ni-MH battery
Output voltage 4.8 V
Weight approx. 0.26 lbs (approx. 120 g)
1.4 AC ADAPTER (OPTION) SPECIFICATIONS
Table 1-4 AC Adapter (OPTION) Specifications
Item Specification
Model number PW-4007-U1-E PW-4007-E1-E
External dimensions
(W ×D ×H) 100 mm ×58mm ×49 mm 1 14 mm ×74 mm ×61 mm
Weight approx. 690ｇapprox. 1000ｇ
Cable length approx.1.9m approx.1.9m, 1.9m
Input power voltage AC 120 V AC 230 V
Frequency 60 Hz 50 Hz
Rated output voltage DC 6.5 V DC 6.5 V
Rated output current 2.0 A 2.0 A
Safety regulation UL, CSA CE

1-4

2-1
CHAPTER 2
DISASSEMBLY
How to disassembly the DPU-414 Serial Thermal Printer is given in this chapter.
Procedure:
1. Remove the 4 screws in the bottom of the printer.
2. Lift the upper cover straight up to remove.
Figure 2-1 Remaining the Screws of the Upper Cover

2-2

3-1
CHAPTER 3
ADJUSTMENT
How to adjust the applied energy for the thermal head and the charging time for the battery are
given in this chapter.
3.1 ADJUSTING THE APPLIED ENERGY FOR THE THERMAL HEAD
Procedure:
1. Check the head rank mark (A, B or C) displayed on the FPC of the printer mechanism
Figure 3-1 Head Rank Mark

3-2
2. Initialize the dipswitches with the following procedure:
1. Remove the AC adapter from the power plug.
2. Connect the AC adapter to the power plug.
3. Power ON the printer while pressing the ONLINE and PAPER FEED buttons on the printer.
4. Release the ONLINE and PAPER FEED buttons after the ONLINE and OFFLINE Iamps blink.
It takes approx. 30 seconds.
3. Initialize the applied energy for the thermal head with the following procedure:
1. Prepare a parallel interface communication between the printer and the computer.
2. Send the following command from the computer:
ESC + "!" + FF16 + FF16
4. Set the head rank and the dipswitches with the following procedure:
1. Prepare a parallel interface communication between the printer and the computer.
2. 2. Send one of the following commands from the computer according to the head rank used:
Head rank Command
A ESC + "." + EB16 + FF16+ FF16+ 7316
B ESC + "." + EB16 + FF16+ FF16+ 7216
C ESC + ". " + EB16 + FF16+ FF16+ 7116
5. Make sure that the printing density is OK by printing a test print.

CAPTER 3 ADJUSTMENT
3-3
[Reference:]
Head Pulse Width:
[Condition:]
•2-2 phase
•High speed print mode
•Print density: 100%
•Non-simulation of strage heat
n×m×)
10
T-24
×2.1+1(×
)25.0-Vp( R×7.1
=Th op
2
Th: Head pulse width (ms)
Vp: Head applied voltage (V)
R: Head resistance (Ω)
Headrank
Resistance
A 17.9
B 16.3
C 14.7
Top: Ambient temperature (°C)
M: Correction factor according to the number of common activated dots
Number of dots m
0 to 3 1.000
4 to 6 1.125
7 to 9 1.250
n: Correction factor according to the activation history
Activationhistory
n
000 7 / 7
100 6 / 7
010 5 / 7
110 5 / 7
001 4 / 7
101 4 / 7
011 4 / 7
111 4 / 7

3-4
3.2 ADJUSTING THE CHARGING TIME FOR THE BATTERY
Procedure:
1. Initialize the dipswitches with the following procedure:
1. Remove the AC adapter from the power plug.
2. 2. Connect the AC adapter to the power plug.
3. Power ON the printer during pressing ONLINE and PAPER FEED button on the printer.
4. Release ONLINE and PAPER FEED buttons after the ONLINE and OFFLINE lamps blink. It
takes approx. 30 seconds.
2. Initialize the charging time for the battery with the following procedure:
1. Prepare a parallel interface communication between the printer and the computer.
2. Send the following command from the computer:
ESC + "#" + FF16
3. Set the head rank and the dipswitches with the following procedure:
1. Prepare a parallel interface communication between the printer and the computer.
2. Send one of the following commands according to the head rank used from the computer:
Head rank Command
A ESC + "." + EB16 + FF16 + FF16 + 7316
B ESC + "." + EB16 + FF16 + FF16 + 7216
C ESC + "." + EB16 + FF16 + FF16 + 7116

4-1
CHAPTER 4
TROUBLESHOOTING
In this chapter, possible causes, the method for their diagnosis, and suggested recovery procedures for
problems that may occur when using the DPU-414 Serial thermal Printer are given.
Below is a listing of the items covered in this chapter, along with the number of the page where they can
be found.
No. Problem Page number
(1) No power. (with the AC adapter) 4-2
(1’) No power. (without the AC adapter) 4-2
(2) Battery is not charged. 4-2
(3) No interface Communication. 4-3
(4) Paper can not be fed. 4-3
(5) Abnormal sound is emitted. 4-3
(6) ERROR LED lights. 4-4
(7) The printer is not initialized. 4-4
(8) Nothing is printed. 4-4
(9) Dots are missing. 4-5
(10) Shortened printing in horizontal direction. 4-5
(11) Defective printing density. 4-5
(12) Uneven printing 4-6
(13) Shortened paper feed pitch. 4-6

4-2
(1) No power. (with the AC adapter)
[Condition] The printer operates, but LEDs do not lights.
Possible cause Diagnostic method Judgement
and rating Recovery
Flat ribbon cable
disconnected Check the continuity of the flat ribbon cable with a tester. Short Replace the flat ribbon cable.
Defective soldering for LED or
defective LED Check the continuity of the LED with a tester. Diode resistance Replace the switch board.
Defective mainboard Measure the voltage of the LED with a
tester. 2.0 ±0.5 V Replace the main board.
[Condition] The printer does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
AC adapter disconnected Measure the output voltage with a tester. 8.5 ±2.0V Replace the AC adapter.
Defective main board Measure the system clock for the main
board with an oscilloscope. 4.19 MHz Replace the main board.
(1') No power. (without the AC adapter)
[Condition] The printer does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
The battery is not charged Measure the output voltage of the battery
with a tester. 5.6 ±1.2V Charge the battery with the AC adapter.
Disconnected connector Visually inspect the connection of the
connector. - Insert the connector correctly.
(2) Battery is not charged.
[Condition] The charging time is too short or long.
Possible cause Diagnostic method Judgement
and rating Recovery
Charging time setting error Measure the charging time. Approx. 10
hours Set the charging time correctly.
[Condition] The charge of the battery is not started.
Possible cause Diagnostic method Judgement
and rating Recovery
Defective voltage of the
battery Measure the output voltage of the battery with a tester. 0.5 to 6.8 V Replace the battery pack.
Defective AC adapter Measure the output voltage of the AC
adapter with a tester. 8.5 ±2.0 V Replace the AC adapter.

CHAPTER 4 TROUBLESHOOTING
4-3
(3) No interface communication.
[Condition] The parallel communication does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
Dipswitch setting error Check the setting of the dipswitch
through the test print. - Set the dipswitch correctly.
Defective main board Check the l/O signals with an
oscilloscope. - Replace the main board.
[Condition] The serial communication does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
Dipswitch setting error Check the setting of the dipswitch through
the test print. - Set the dipswitch correctly.
Defective main board Check the l/O signals with an oscilloscope. - Replace the main board.
(4) Paper can not be fed.
[Condition] The paper feed motor does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
Defective drive voltage of the
paper feed motor
Measure the voltage between motor
common and each phase with an
oscilloscope. 4.88 ±0.5 V Replace the main board.
Attachment of alien
substances to the gears of the
paper feed motor
Visually inspect for substances around the
gears. - Remove alien substances.
(5) Abnormal sound is emmited.
[Condition] There is an abnormal sound when the thermal head is scanned.
Possible cause Diagnostic method Judgement
and rating Recovery
Attachment of alien
substances around the head
carrier
Visually inspect around the head carrier for
alien substances. - Remove alien substances.
Awry FPC for head Visually inspect the FPC for head for alien
substances. - Set the FPC correctly.
[Condition] There is an abnormal sound when the paper is fed.
Possible cause Diagnostic method Judgement
and rating Recovery
Attachment of alien
substances to gears
concerned with the paper feed
Visually inspect the gear around for alien
substances. - Remove alien substances.

4-4
(6) ERROR LED Iights.
[Condition] The printer does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
Paper jams and the head does
not scan Visually inspect the paper jam. - Remove the paper jam.
(7) The printer is not initialized.
[Condition] The head scaning motor starts and stop immediately.
Possible cause Diagnostic method Judgement
and rating Recovery
Defective timing switch Check ON/OFF of the home switch with a
tester. - Replace the printer unit.
(8) Nothing is printed.
[Condition] The head operates correctly, but nothing is printed.
Possible cause Diagnostic method Judgement
and rating Recover y
Disconnected FPC for the head Measure the resistance of the FPC for the
head with a tester. 16.3 ±: 3.0 ΩReplace the printer unit.
Disconnection of the connector
of the FPC for the head Visually inspect the connection of the FPC connector. - Insert the connector correctly.
Burned thermal head Measure the resistance of the FPC for the
head with a tester. 16.3 ±3.0 ΩReplace the printer unit.
Reverse setting of the thermal
paper Visually inspect the surface of the thermal paper. - Set the thermal paper correctly.
Paper used is not a thermal
paper Visually inspect the paper itself. - Use the specified thermal paper.
[Condition] The printer does not operate.
Possible cause Diagnostic method Judgement
and rating Recovery
Disconnection of the connector
of the head scaning motor Visually inspect the connection of the head scanning motor connector. - Insert the connector correctly.
Disconnected load wire for the
head scaning motor Check the continuity of the lead wire. Short Replace the printer unit.
Defective main board Measure the drive voltage of the head
scaning motor with an oscilloscope. 4.88 ±: 0.5 V Replace the main board.

CHAPTER 4 TROUBLESHOOTING
4-5
(9) Dots are missing.
[Condition] Only certain dots are not printed.
Possible cause Diagnostic method Judgement
and rating Recovery
Disconnected FPC for the
head Measure the resistance of the FPC for the head with a tester. 16.3 ±3.0 ΩReplace the printer unit.
Defective contact between the
FPC for the head and the
connector on the board
Measure the resistance of the connector on
the board with a tester. 16.3 ±3.0 ΩInsert the FPC to the connector correctly again.
Burned thermal head Measure the resistance of the FPC for the
head with a tester. 16.3 ±: 3.0 ΩReplace the printer unit.
(10) Shortened printing in horizontal direction.
[Condition] Stack of dots.
Possible cause Diagnostic method Judgement
and rating Recovery
Step-out of the head scaning
motor (Abnormality of the drive
voltage of the head scaning
motor)
Measure the voltage between motor
common and each phase with an
oscilloscope. 4.88 ±0.5 V
Replace the main board.
Step-out of the head scaning
motor (Attachment of alien
substances around the head
carrier)
Visually check alien substances around the
head carrier. -
Remove alien substances.
(11) Defective printing density.
[Condition] All dots are blurred or too light
Possible cause Diagnostic method Judgement
and rating Recovery
Defective thermal head
resistance Measure the resistance at the FPC terminals with a tester. 16.3 ±3.0 ΩReplace the printer unit.
Defective contact between the
FPC and the connector Measure the resistance at the connector terminals with a tester. 16.3 ±3.0 ΩInsert the FPC to the
connector correctly again .
Use of unspecified paper Visually inspect the paper used. - Use the recommended
thermal paper.
Error of the dipswitch setting Execute the test print and check the
printing density. - Set the dipswitch correctly.
Error of the head rank or
applied energy setting Measure the applied pulse width and voltage with an oscilloscope. - Adjust the applied pulse
width correctly.

4-6
[Condition] Certain dots are blurred or too light.
Possible cause Diagnostic method Judgement
and rating Recovery
Flaw and dent of the platen
surface Visually inspect the surface of the platen (rubber of the platen). - Replace the printer unit.
Defective rocking of the platen Visually inspect alien substances around
the platen supporter. - Remove alien substances with a cotton swab.
Increase of the resistance of the
certain dots of the thermal head Measure the resistance at the FPC terminals with a tester. 16.3 ±3.0 ΩReplace the printer unit.
Attachment of alien
substances to the platen
Visually inspect the surface of the platen
(rubber of the platen). - Remove alien substances with a cotton swab.
(12) Uneven printing.
[Condition] The start point of printing is uneven.
Possible cause Diagnostic method Judgement
and rating Recovery
Step-out of the head scaning
(out of range of printing)
(Defective drive voltage of the
head scaning motor)
Measure the voltage between motor
common and each phase with an
oscilloscope. 4.88 ±0.5 V
Replace the main board.
Step-out of the head scaning
motor
(out of range of printing)
(Attachment of alien substances
around the head carrier)
Visually inspect alien substances around
the head carrier. -
Remove alien substances.
Defective timing switch Check the switch timing with an
oscilloscope. - Replace the printer unit.
(13) Shortened paper feed switch.
[Condition] There is a stack of the line space.
Possible cause Diagnostic method Judgement
and rating Recovery
Step-out of the paper feed
motor
(Defective drive voltage of
the paper feed motor)
Measure the voltage between motor
common and each phase with an
oscilloscope. 4.88 ±0.5 V
Replace the main board.
Step-out of the paper feed
motor (Attachment of alien
substances to gears
concerned with the paper
feed)
Visually inspect around the gears.
-
Remove alien
substances.
Too much paper load Visually inspect the set condition of
the paper. - Set the paper correctly again.