SHARP ER03RPS, ER-03RP Service Manual

ER+3RP

SHARP SERVICEMANUAL

CODE:OOZER03RPSM-E

RemotePrinter

MODEL ER-03Rp

OPTION FOR ER-52BR . ER=8700

ER-4100 9ER”3300 ER-3310 IN LINE SYSTEM

CONTENTS

General . . . . . . . . . . . .

Specifications . . . . . . .

Setting of Dip switches

Disassembly procedure . . . .

Circuit description . . . . . . . . .

Printer unit description . . . . .

6 7

Overview and operating principle of the printer . . . . . . . . . . . . . . . . . . . . 10

Troubleshooting

Disassembly and

10.

Test Function (SWI-7: ON) .

. . . . . . . . . .

reassembly

. . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 2 3 4 9

14 18

11.

Special service tool . . . . . . . .

12.

Circuit diagram . . . . . . . . . . .

~“*~~ ~~~~~~A~lON foraftersaiesserviceonly.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

This document has been published to be used

The contents are subject to change without notice.

1. General

The ER-03RP is remote printer which uses the SRN (Sharp Retail Network) as external device which are used with ECR and POS terminal that has the same interface. Functionally, the ER-03RP is nearly equal to and compatible with the cument model ER-01RP, except that the ER-03RP does not have an auto cutter feature. (The command is sub-set of the ER-01RP.) The ER-03RP is only available as a desktop model and cannot be mounted on a wail.

System diagram

12)

Operationmode

Self test

(normalprintmode)

On-line Off-line (standby mode) Print hait mode

13)

outlook

@On-line switch.

@Line feed switch. \/. \

<opnntermver

ER43RP

1) The maximum number of option units depends application program.

2) The total cable distance should not exceed lkm.

(

Specification

External interface

SRN interface ... one host, n units of printers ER525R system n = 9 max. ER8700 system n = 5 max. ER3300/331Osystem n = 9 max. ER4100 system n = 9 max. ER52BR/3300/3310 : US, CANADA Model ER8700/4100 : Other

Control method

Controlled by the command from the host (ECR,

Printer

Model: DP-614 serial dot printer Printing area: 36 columns/line (normal mode)

Font: Print color: Print speed”:” Linefeed:

Kinds of printing character sizes

Normal, Double size

Manual paper cutter (Tear bar)

Print data protection

Backed up by battery.

Installation

Desktop

Cabinet

Moisture tight Print paper

Kind: Piain paper Size: Thickness: 0.07- 0.0’3 Weight: 52- 64g/m2

Ink ribbon cassette

10)

Color: Two colors of black and red

11)

Character set

ASCII conforming 7-bit’8-bit character

SRN(lMbrs\

18 coloumns/line (enlarge mode) 8 x 8 dot matrix Black/red (two colors)

3.0 lines/second 18 lines/seconds (fast mode)

76.0 ~ 0.5mm, paper roll diameter 83mm

on the system’s

Pos)

~ ‘~WER indicator

QRibbon cover

“~\::;:;;::;r

@Upper cover

OS-RN

@AC cord assy~

Size/Weight

14) 176(W)

x 263(D) x 125(H)mm (include to connector)

(6.9”(W)

3.2kg (112.8 Ibs)

15)

Power source/Power consumption

AC local voltage (*1O%)50/60Hz Max. 30W

16)

Ambient temperature, humidity O“C-

30Y0- 90%

17)

Reiiabiiity

Printer (except dot head): Dot head: Ink ribbon:

18)

Description of Each Block (Ref. Fig. l-l)

0 AC cord assy

Q) AC inlet

@ Power switch

@ Online switch

X 10.4”(D) X 4.9”(H))

40”C (32 - 104”C)

Insert the connector into the AC inlet of the printer and the plug into an AC outlet.

An inlet for power input. Insert the connector of the power cord assy into this inlet.

Set the switch ON to turn on power to the printer.

Press the switch to set the printer to the

select (online) mode. Press the switch again to set the printer to the deselect (off-line) mode. The switch is also used to reset the alarm,

@Bottom cover

@ Power switch

~ AC inlet

Fig. 1-1

MCBF 2.5 million line 50 million characters Approx. 2 million characters

-1-

ER-Q3RP

When the switch is pressed during the printer operation, the printer is set to the deselect mode after pfinting the current line.

Setting the power switch ON with the online switch held down will initiate the master reset operation.

Line feed switch

POWER indicator

(yellow green) ONLINE indicator

(yellow green)

ALARM indicator (red)

Connector

Printer cover Ribbon cover Upper cover Bottom rover

Setting of Dip

Remove the bottom cover of the remote printer to acoess the three 8-position dip switches. The following describes the dip switch functions.

Press the switch to feed the paper (in the deseiect mode only). The switch is used when loading new paper or when typing space between lines.

Comes on when the power switch is set ON, and goes off when it is set OFF.

Comes on when the printer is set to the select (online) mode, and goes off when it is set to the deselect (off-line) mode. Printer operation is possible only when

the indicator is on. Lights when the printer trouble O@ufred

or when the paper has depleted. When the indicator turns on, both the printer and line feed operations are disabled. To reset this condition, either press the online switch or turn off and on the printer power.

Used to connect the printer to the SRN host via a cable. Check that the power is off to both the printer and the SRN host

when connecting the cable. Open the coverto replace the paper. Open the coverto replace the ribbon.

switches

3-1. SWI (DSI)

Swl “1

SWI-2,3,4 Used to select the diagnostic program type.

Swl -2 SW1-3 SW1-4

ON ON

OFF

OFF OFF

OFF ON

ON OFF OFF

OFF OFF

●1 These two tests are collectively referred to as the SRN basic test.

The above dip switch settings are effective only when the diagnostic mode is ON (SW1-7 ON). For deals of the diagnostic programs, refer to Section 3-3.

Used to select CR mde enable/disable. ON: OFF:

OFF ON RAM verifv

CR code enabled CR code disabled

ROMIRAM test

Hostterminal emulation mode

Dip sw-tch’scantest

OFF

Print test

OFF

SRN flag continuous transmission *I SRN packet continuous transmission

OFF

Line inspection program

Function

●1

SWI -5,6

Swl -7

SWI -8

Used to select the code conversion type The remote printer provides two different types of code conversion to handie the difference of code systems between dissimilar machines. The switch is used to select which type of code conversion to adopt.

Swl -5 SW1+6

OFF OFF

OFF

Used to set the diagnostic mode.

Upon power-on, the switch is scanned, and when the switch is on, the diagnostic program is initiated in accordance with the setting of SW1-2,3,4.

ON I Diagnostic mode

OFF ~Normal operation mode

Used to set the auto cutter YES/NO. The ON status of the switch indicates that the auto cutter is used. Since the ER-03RP is not provided with an auto cutter, the switch should always be set OFF.

OFF

ON No code conversion

, ON

Conversion type Type 1 Type 2

No code conversion

3-2. SW2 (DS2)

SW2-1,2,3,4

SW2-5

SW2-6,7

SW2-8

Not used. All fixed to ON. Used to select the SRN transmission speed.

OFF ~480 Kbps

In the normal operation mode (SW1-7 OFF), the switch state is scanned immediately after the master reset has done, and is set in the SRN controller. Master reset must therefore be done when the transmission speed setting is changed. in the diagnostic mode, the transmission speed is set each time, immediately before the execution of the SRN basic test or the host terminal emulation.

Used to set the carrier off monitoring time.

SW2-6 SW2-7

OFF i OFF

OFF ‘ ON

the host terminal emulation. Not used. Fixed to OFF.

1 Mbps

OFF

Tmer value

1 Mbps

6.4mS 12.8mS

4.8mS 9.6mS

3.2mS ]

1.6mS

480 Kbps

6.4mS

3.2mS

-2-

ER-03RP

3-3. SW3 (DS3)

The dip switch is used to set the SRN terminal address.

In the normal operation mode (SW1-7 OFF), the switch is scanned immediately after the master reset has done, and is set in the SRN controller. Master reset must therefore be done when the address setting is changed. In the diagnostic mode, the address is set each time, immediately before the executi~n of the SRN basic test. Only in the case of executing the host terminal emulation in the diagnostic mode, the address setting by the switch is used address of the remote station. The address is set using a binary number with the SW3-1 setting as the most significant bit and the SW3-8 as the least significant bit.

as the

3-4. Dip switches DS1-DS3 factory setup

SWITCH

Swl -1 CR code (disabled) SW1-2 I Swl -3 SW1-4 I ‘ ‘

SW1-5 i SWI-6 ~ SWI-7 \ Diagnostic mode (prohibited) SW1-8 ! Auto cutter (NO)

I sw2-1 I

SW2-2

SW2-3

Selection of diagnostic program (line inspection test) ------------

+Selection of conversion type (type 1) ,

Not used Fixed to All “ON”.

Function Default

I ~--------:;:-

[ ~

~-----------,

I ,

I I

OFF

OFF OFF OFF OFF OFF

ON I

4. Disassembly procedure

4-1. Removal of upper cover and bottom cover

To remove the upper cover, remove the screws M3x6 (at four

locations) shown in the figure and unfasten the connector with the upper cover lifted up.

Remove the screws M3x6 (at four locations) on both sides to remove the bottom cover.

SW2-5 I SRN transmission speed (1M bits) ~ $W2-6 I

SW2-7

SW2-8 SW3-1 I

I SW3-3 I

SW3-4 Terminal address (OOH) SW3-5

I SW3-6 I

SW3-8 I

Carrier off timer (6.4ms)

Not used

I /

]

.-_----_----

L------------4

L------------A

L------------q

-------_----

1 L----.---95:

L------------q !-------------+

OFF

OFF OFF

OFF I OFF

OFF I

OFF ]

Fig, 4-1

4-2. Removing the printer mechanism

● Remove the upper cover.

● Remove the screws M3x14 (at two locations) shown in the figure.

● Remove the printer mechanism by lifting it up in the arrow direc-

tion. Note: Two washers are provided for the screw in side (A) only.

Printer

-3-

Fig. %2

ER-03RP

4-3. Removing the control PWB and SRN interface

PWB

●

Remove the bottom cover.

●

Unfasten the mnnectors (at six locations).

●

Remove the PWB holdina screws (at four locati~ns) and the connector cover holding scre; (at one place) to remove the PWBS.

SRN interface PWB

Control

Fig. 4-3

4-4. Removing the power supply PWB and AC

power supply unit

Removing the power supply PWB

● Unfasten the connectors (atthree locations).

● Remove the screws M3x1O (at two locations) and tapping

screws M3x8 (attwo locations).

● Remove the PWB while paying attention to the wires.

2) Removing the AC power supply unit

●

Remove the AC inlet holding screws M3x6 (at two locations)

and the ground wire holding screw M4x6.

●

Remove the power transformer holding screws M4x6 (at three locations).

●

Unfasten the connector at the secondary side of the power

transformer to remove the entire power supply unit.

Power supply PWB

Noise filter PWB

Power transformer

4-5. Removing the operation panel PWB and PE

sensor PWB

Remove the upper cover and the tapping screws (at two locations) to remove the operation panel PWB.

Remove the printer mechanism and the screw (at one place) to remove the PE sensor PWB and PE sensor holder as an assemb-

ly. To remove the PWB alone, twist the PE sensor holder lug and detach the PWB from the holder.

Fig. 4-5

4-6.

When fixing with the switch panel intedace connector PWB removed, use fixing screw of 3 x 8. If the any other screw is used, it makes contact with the power PWB.

5. Circuit description

5-1. General

The ER-03RP is a remote printer using the SRN (Sharp Retail Network) as an external interface through which connected to an electronic cash register and a POS terminal. (ER-52BR, 3310, 3311, 3300, 8700, 4100) The remote printer has a control circuit that consists mainly of a CPU, a ROM, a RAM, and their peripheral circuits, an SRN interface circuit

for interfacing with the host, an operation panel circuit for operation

switch inputs and LED display, a printer mechanism, and a power supply circuit for supplying necessary power to each circuit. Fig.5-l shows a block diagram of the remote printer.

Fig. 4-4

-4-

m.?. a

AC230V

Opratlon ~el

SRNIIF

Fig.5-l ER-03RP block diagram

Osc7.37MHZ

,+il

(MS0734)

I .,

&,fi

CPU

..I-i

ROM RAM

Pmer ~VRAM ~-

r---- . .

ER-03RP

5-2. SRN control circuit

1) 1/0 allocationandmemorymapping

The CPU used in the SRN control circuit is a single chip 8-bit C-MOS

microprocessorwith an external memo~.

In addition to general purpose 1/0 ports, the CPU has expansion 1/0 PO* externally allocated on the memory space. It has an address space of 64K bytes, w“th a ROM,

externalexpansion 1/0s peripherally manged as shown in the at-

tached page. The RAM destination, the RAM size being checked by software. Data and control commands are transferred to and tiom the SRN through the registers in the SRN interface circuit which are allocated on the memory space. The ROM has a capacity of 256K bits and contains control software and CG data for character printouts.

hasa capacityof 64K bits or 256K bits according to the

a RAM, and

2) CPUperipheralcircuit~

The M50734SP CPU is a CPUwithanextemdmemory, and reads the 8 low-order bits of the address through the AO/DObus lines from

an 8-bit latch HC373. The ROM has bits. A super capacitor is used to provide backup power in case of a power failure. IC9 (74HCOO)is also operated on the VRAM power supply for standby control. A ceramic osallator is used as the CPU dock to provide a dock frequency of 7.37MHz.

acapaatyof256K bits, and the RAM 64K bits or 256K

( Qls

74”[00

7“F ‘

)

I I

Fig.5-2 ROM/RAM circuits

-5-

ER-03RP

3)ConnectionwiththeSRNinterface

The control circuit shares the data bus with the SRN interface circuit, and hardware connection is established between them using ~, ~, and other control signals. Logic drive power of +5V and SRN bias voltage of +12V are supplied from the power supply unit. The SRN interface circuit is not backed up by the VRAM power.

DATA INIOUT

BNC

[lM@s)

SRNIIF

2P W’u

(Wm-lz) (=606-11)

I 1

+5V

Fig.5-3 SRN interface/printer wntroller signal diagram

Interface sianal descri~tion

The SRN interface is reset with a low state of signal. The CPU

resets the SRN interface any time through the printer controller P03 port.

REsff

Reset signal. ~is signal is at a high during the power ready state (when +5Vfie\e is secured) and low otherwise.

m, m

Signals for data read/write between the SRN interface and the controller.

SRNS SRN interface select signal

DO- D7 Data bus

TRRQ Interrupt request signal from the SRN interface to the controller

Power supply +5V : Logic drive power +5V*5%, 250mA +12V: SRN line bias circuit power 12V*1

““s 7

IWP ~

04!

C#2

. -

m-07

RnWr COntrok

(PC6C6.13)

+5V (*N +24V (IJm +12V (l WA)

I I

,P - s- FWB

?“

Yo, 150mA

●5V

4)Initialresetandpowerdowninterruptcircuit

IC3 is for generating a power down interrupt and a reset signal. When

the supply voltage drops due to a power failure or other cause, the

circuit works to detect the voltage drop and stores necessary data in the RAM before going into the power down mode. As shown in the timing chart, when Vcc drops to 4.6V at the time of a power failure, the voltage drop is detected, causing the IC to generate a power down interrupt signal, which is sent to the CPU. in response to the interrupt signal, the CPU issues the data and other necessary information in the buffer to the RAM. This process is compieted in about 500msec. Upon mmpieting the execution of the backup sequence, the CPU

sends out signal RESET OUT through the port (P37), putting itseif in a hardware reset state to prevent it from operating in an unstabie condition. Aiso, when the power down process is entered, the watchdog timer is cieared, and WD is issued in 4msec, whiie in about 900msec a power down reset is caused, thus providing a tripie faii-safe mechanism,

; 1-4H>

Fig.5-5 Reset and power down interrupt circuit

‘cc(’v)r-

Powerdown interrupt

Readdata

Writedata

maw120n2

MB62H149AC gate array timing

Fig.5-4 SRN interface data write/read timinas

P37 r’~1 RESETOUT

WD Watchdog

timeroutput

Fig.5-6 Timing chm

-6-

5)Printercontrolcircuit

When a low state of signal through the port P31 of the CPU, the motor starts to run with timing pulses appearing on the DP line of CN5.

After the motor statied, printing takes place in synchronism with the timing that the Pport P34 turns from high to low.

Of nine CPU output ports P20-P29 and P30, a low state of puise is sent at selected ports, and a character is printed with one energization of the DOT solenoid against two timing pulses.

Paper feed prescribed timing.

Color change is performed when the port P32 of the CPU goes

5) low

is done when the port P43 of the CPU goes low at a

ataprescribed timing.

CM3 -14 CN3 -6

CH3-13 CN3-7 CM3-12

(N3 -4 CN3 -11 CN3 -5 CN3 -3

CM3 -i CM3 -.9

,,,,,”:&;‘GpW~ ; ‘

+ 4V HRI 3408

CN3 - 1s

CN3 -2 CN3 -17 CN3 -16

191

1OK-9

ER-03RP

CPU

---

P20

1s P23

I p24

1?,

1s P2S

P26

P27

‘ P30

21 22- P31

P32

i’

24 P33

XIN

X12UT

4s d4

CN2 - I CN2 -2

CN2 -3

CN2 -5

[N? -7

CN2 -4 CN2 .6 CN2 -9

54 HC14

Fig.5-7 Printer control circuit

6) Paperend

Fig.5-8

sensor circuit

shows

the paper end sensor circuit. A

reflection type p~otointerrupter is used as the sensor. When the paper is present, the light reflected from the paper strikes the phototransistor;, there-

fore, the collector of the phototransistor is at a low. On the other hand, when the paper runs out, since no light is reflected, the collector is at a high, which causes the input port P40 of the CPU to go high, thus informing the paper end state.

1 I

23 2A p.) 354

~ ~

end sensor ~

Paper

—.—.—.—.—. I

PHI 1

1 !

., i:

1. I I

—.—.—.—.—.

Fig.5-8 Paper end sensor circuit

V55

?!0

PI 1 P12 P13

P14 Pl!i Pls P17

P40

P42

1 I

[CNTR) P02

P03

62 63 I

Control circuit

\tPP I

v Gu

-7-

ER-03RP

7)Interfacecircuitwiththeoperationpanel

shown in Fig.5-9, the operation panel circuit includes switches; an

online switch and a line feed switch. The switches are mnnected to the respective input ports of the CPU, while the LEDs are connected

to the output ports through the drivers.

Operation panel circuit

.—.—.—.—.—.—.—.—.

LED1

nFQwER

LED2

~ON-LINE

LED3

~URM

i ,=.—O

I i;

-. —. —. —. —. —. —. —.—. J

ON-LINE

—

“

. Y I T

Control circuit

.—.—.—.—.—.—.—. —.-

vc~

CPU

PD4

P42

.—.—.—.—.—.—.—-—--

Fig.5-9 Operation panel circuit

5-3. SRN interface circuit

1) Circuit description

The SRN interface is allocated at the l/O space address, with the printer controller as the host CPU, and transfers data

using seven interface registers. Data is transferred to and from the external

devices at IM bps using

a coaxial cable. (RG-58U)

for interfacing

t 1 b I

CPU Z-80

DMA

1. Set the oscillator.

1MHz

P-P

Outputimpedance

Checkonoscilloscope

P 1-

o.5ps o.5ps ‘

Fig. 5-11

2. Connect a dummy network to the printer. Connect the oscillator and the oscilloscope as shown below.

PG-12

VR1

~D @ TP

[

Dummv network

Oscillator I

3. Adjust the VR1 5KQ potentiometer to obtain the following waveform.

Fig, 5-12

BUS

.? ‘

l/F

ADLC

link

controller

Driver

MOD.

Receiver

printer controller

ROM

RAM

TIP

[

1Mbps

I DATA

Fig.5-10 SRN interface block diagram

2)Adjustment

The duty adjustment of the intedace is carried out in the following manner.

0.6ps 0.4ps

4. Power supply circuit

Power supply circuit (secondary side)

Fig. 5-I 3

T1 : 580nsec-620ns~ T2 :380nsec-420nsW

This power supply circuit supplies the logic drive power of 5VDC, the printer mechanism dtive power of 24VRC, and the SRN interface bias circuit drive

power of 12VDC. CN2 is mn-

nected to the printer control PWB, and CN3 to the SRN interface PWB. ICI is a regulator IC of low saturation voltage type which sup

plies stabilized +5V power to the circuits, The 24V power is stabilized by IC2 with the current boosted by transistor Q1. The +12V power is created from the 24V power using IC3. The fuse is TlA250V, and protects the 5V power from overcurrent.

Noise filter circuit (primary side) The noise filter circuit uses a common mode type fiher to eliminate noise generated from the

ACpower sup~y as well as

radiation noise from the printer and thus assure stable operation of the printer.

,.........,

●

AC IN

L/.~ --OL -~

T :- : 1 T

cl i j j C2 ~ 104 ; :

J2 F ‘.........’

NF pLA3021A

‘1

: ~lo4 ~w :J

-’- C3222

T222

➤ N

ACOUT

➤ L

Fig. 5-14

-8-

ER-03RP

6. Printer unit description

6-1. Hints and tips in handling the printer

6-1-1. Hintsinusingtheprinter

Do not operate the printer

(1)

paper and ink ribbon. Printing without damage the printhead and platen surface, deteriorate the print

quality, and

(2)

Do not try to move the print head by hand. Since the belt that

drives the print head is directly coupled with a gear train, the belt and the carnage drive pipe will be subjected to overload

the print head is

and other trouble.

(3)

Since the printer uses a permanent magnet (in the motor) and an electromagnet, avoid using the printer in a location that may be subjected to a large amount of iron filings, dust, dirt, etc.

Printed circuit boards are mounted in the bottom of the orinter.

(4)

Take care so that the printed circuit boards do not c~me in contact with the case or foreign materials do not adhere to the boards.

shorten the printer life.

moved by hand, leading to timing misalignment

6-1-2. Hints in storing the printer

(1)Do not store the printer in a location where a large amount of

or dirt, high temperature, or high humidity is encountered.

dust

6-2. How to load the paper

Use paper of prescribed standard.

6-2-1. Paperleadedgefinish

Cut the paper lead edge straight. (See figure below) If the paper cannot be smoothly taken up by the paper feed roller, fold back the paper lead edge for ease of insertion.

6-2-2.How to loadthe rollpaper

Load the paper as shown below.

when the printer is not loaded with

paper or ink ribbon will

when

6-24. How

The paper can be removed from the printer in any ofthe following methods.

(1) Pull out the paper upward. (For fridion type only)

to removethepaperfromthe printer

NOTE: Paper must be pulled straight upward. If pulled slanting-

ly,the paper may become jammed in the printer.

1““Qllw1I

(2) If the printer is provided with a paper feed knob, pull the knob to

release the shaft, and rotate the shaft to eject the paper. (in this case, the paper can be ejected in either direction)

(3) Eject the paper by electrically operating the printer (pressing the

paper feed button with the power ON),

6-3. Hints in using the ribbon cartridge

Use the ribbon cartridge of prescribed specification. If a non-specified

ribbon cartridge is used, problems may arise such as malfunctioning

of the wire, deterioration of print quality, etc.

6-3-1. Howto installtheribboncartridge

Tghten the ink ribbon by rotating the ribbon cartridge knob

(1)

clockwise (arrow direction).

(2) Fit the ribbon cartridge into the ribbon plate (or frame) with the

ribbon inserted between the ribbon mask and the print head.

(3) After the ribbon cartridge is installed in position, rotate the ribbon

catiridge knob once again in the clockwise direction (arrow

direction) to remove the slackness in the ribbon.

6-3-2.Howto removetheribboncartridge

Pull up the ribbon cartridge by holding the right or left side of it. If

there is difficulty

unlock the hook on removal.

in removal, push the cartridge to the right or left and

one side before pulling up the cartridge for

Correct

Incorect

6-2-3. How to load the sprocket paper

Pull the knob outward and manually rotate the sprocket to load the paper. With the knob pulled outward, the sprocket can be freely

rotated.

6-4. Cleaning

(1)

(2)

-9-

After using about 10 rolls of paper or after six months of use,

clean the printer to remove recording paper dust and dirt. It is

desirable to clean by vacuuming (use a vacuum cleaner).

Thoroughly clean eve~ part of the printer by vacuuming dust and dirt.

Use alcohol or benzine to wipe off dirt. Never use thinner, trichlene, or ketone detergents as these may deteriorate or damage the plastic parts.

ER-03RP

7. Overview and operating principle of the

printer

7-1. Overview 7-1-1.Features

The DP614 printer is a compact serial dot printer, and has the following features.

(1) Compact, light weight, and low power consumption. (2) High speed printing, crisp printing by high reliability 7-pin head,

and bidirectional printing method.

(3) Paper insertion in both directions, from the rear and from the

bottom. (for friction type only)

Generalspecification

7-1-2.

Printing method Serial impact dot matrix printing method

Printing direction Bi-directional (unidirectional for graphic printing)

Printing speed

3.0 iines/sec. (At motor voltage +25V, +25*C)

Print format

1) Character matrix 7x7 (including half dots)

2) Dot composition 180 (360) dots/line Numbers in parentheses include haff dots.

3) Print columns and character size

40 columns 1,4(W) x 2.4(H)mm

Color change Color change is accomplished by energizing the color change solenoid.

1) Voltage:

Resistance:

Paper feed

1) Voltage:

Resistance:

2) Paper feed pitch

3) Quick paper feed

Recording paper

Type

Kinds of paper

Recommended paper (Cutform paper) 45-55kg/l 000 sheets (1091x788mrn/sheet) (Copy paper) Non-carbon paper Friction type: Pin wheel type:

Inking

9. Motor

10. Printhead

*1 070

24ti VDC 33*3Q (25&)

24~~VDC (across solenoid termin~s) 33*3Q (25-C)

4.23mm (1/6”)

2.82mm (1/9”) for graphic type Approx. 18 lines/see.

Friction type:

Pin wheel type: Fan fold paper

Special cartridge ribbon, red/black two-color or black monocolor

DCbrush motor Voltage:

Current:

Number of wires:9 Wire diameter: 0.3mm Wire pitch: Solenoid: Resistance:

Roll paper 76m@.5mm, (width) $83mm (outer dia.)

Width 76mm (3”) to 89mm (3.5”) Plain paper and non-carbon paper

One original + one copy One original + two copies Total thickness 0.2mrn max.

24t4 VDC Peak current Approx. 1A

Average current 0.2A max.

0.353mm Voltage 24*1 VDC 17Q (25*C)

11. Overall dimensions

12. Weight

13. Reliability Printhead life: Printer mechanism: MCBF 2.5 million lines

14. Operating temperature

137(W) x 136(D) x 63.5(H)mm (5.4”(~

Approx. 690g (1,5 Ibs)

X 5.35”(D) X 2.5(H))

50 million characters

o to +50”C

7-2. Mechanism and operating principle

7-2-1.Outlineof mechanism

The printer mechanism mnsists of the following nine blocks.

(1)

Frame block

(2)

Motor block

(3)

Power transmission mechanism block

(4)

Sensor mechanism block

(5)

Head feed mechanism block

(6)

Printhead mechanism block

(7)

Paper feed mechanism block

(8)

Ribbon mechanism block

(9)

Color change mechanism block

Mechanismandoperatingprinciple

7-2-2. Of the above nine biocks, seven mechanism blocks excluding the

frame and motor blocks are described next for their structures and operating principles.

(1) Power transmission mechanism block

This mechanism block is disposed en bloc on the right side of the printer unit, and consists of a motor pinion fixed to the motor shaft, a reduction gear, and a drive gear, plus four gear trains

coupled to the drive gear, i.e. a head feed gear train, a paper feed gear train, a ribbon feed gear train, and a ribbon reset gear train.

Reduction gear

gear

@ Head feed gear train

This gear train consists of a pulley drive gear, which is driven by the drive gear, a drive puliey, and an idle pulley. The drive

pulley drives a timing belt SA to feed the printhead.

Drive gear

ive gear

ldl~pulley

-10-

ER-03RP

Paper feed gear train

This gear tr~n consists of a PF slip gear, which is coupled by friction to the drive gear, a PF drive gear BK, which is coupled via a cfutch to the drive gear, a clutch gear BK, a PF reduction gear, and a PF shaft gear, to transmit power to the PF shaft.

Drive gear

PF drive gear

Clutch gear

, /

PF reduction gear

PF shaft gear

@ Ribbon feed gear train

The gear train consists of a ribbon slip gear, which is coupled by friction to the drive pulley, a ribbon reduction gear, and a

ribbon drive gear, and works to continuously

take up the ribbon

asthe motor rotates.

Drive pulley

Ribbon slip gea

Ribbon reduction gear

Ribbon reset gear train

The gear train consists of a reset cam drive gear, which is

driven by the drive gear, and a ribbon reset cam. The ribbon cassette in the red printing position is returned to the black printing position by the rotation of the ribbon reset cam.

Ribbon drive

gear

Drive gear

DP (dot pulse) sensor and HP (home position) sensor The DP/HP sensor block consists of a dot pulse disk directly coupled to the motor shaft and having equispaced apart 20 slits, a DP disk integrally formed with

ahome position sensor

pulse disk having one slit, and photointerrupters solder bound to the mnnector PCB SA and corresponding to the respective disks. A pulse is generated as each slit of the disk passes the sensor. The dot pulse sensor outputs a signal (DP) which is used to

the print solenoid, paper feed, and mlor change. On

control the other hand, the home pcsition sensor issues a signal

(HP) for every 17 DPs (or 20 DPs), and the signal (HP) is combined with the signal (RP) output from the reset pulse sensor hereinafter described to determine the DP count start position. No waveform shaping circuit is included in the printer, therefore, it is requested that the shaping circuit be provided at the user side.

RP (reset pulse) sensor The sensor mechanical !eaf switch

block consists of an RP switch SA which uses a

attached on the bottom of the bottom

plate BK. As the cm-age passes the switch, the actuator is turned on and off to output a signal (RP). The signaf RP is used as the home position reference signal.

(3)

Head feed mechanism block The head feed mechanism block consists of the pulley drive gear, which is driven via the drive gear

train, the drive pulley, the

timing belt SA (mmprising a timing belt and a carriage drive pin), the carriage, and the idle pulley. me carriage drive pin consists of beit fixes WB and carriage drive pipes U and L, and is fixed to

the timing belt. When the motor is rotated by a print or paper feed command, the timing belt SAruns in the clockwise direction to horizontality move the carriage with the carriage drive pipe inserted in the elongated groove of the carriage. When the printing operation is completed, power

is shut off to

the motor at a prescribed timing to stop the carriage. At this time, the head stops at approximately the center position.

Ribbon reset cam

cam drive gear

Reset

(2)

Sensor mechanism block

The sensor mechanism block consists of three sensors, i.e. a

DP (dot pulse) sensor, a HP (home position) sensor, and an RP (reset pulse) sensor, and plays an important role in the operation and control of printer mechanism parts.

HP sensor (photointerrupter)

otor BK

nterrupter)

-11-

Timing

rriage drive pipe L

(4)

Printhead mechanism biock

Tming belt

The printhead mechanism tinsists of a nose assembiy housing nine wires, a solenoid base comprising soienoids and armatures for driving the wires, and a cover for keeping the armature stroke to a prescribed vaiue. When the selected soienoid is energized for about 450ms in synchronism with the dot pulse,

the corresponding armature is

pulied into the soienoid. me armature action is transmitted to the corresponding wire, causing the wire to strike the recording paper through the ribbon to produce a dot on it.

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