SHARP ER04RPS, ER-04RP Service Manual

SHARP SERVICEMANUAL

CODE: OOZER04RPSM-E

RemotePrinter

MODEL ER-04Rp

OPTION FOR IN LINE SYSTEM

1.

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

2.

Specifications. . . . . . . . . . . . . . . . . . . .

3.

Settingof Dip switches . . . . . . . . . . . . .

4

Disassemblyprocedure . . . . . . . . . . . .

5.

circuitdescription. . . . . . . . . . . . . . . . .

6.

Printerunitdescription . . . . . . . . . .

7.

Autocutterunit . . . . . . . . . . . . . . . . . . .

Overviewand operatingprincipleofthe

8.

Troubleshooting. . . . . . . . . . . . . . . . . .

9.

Disassemblyand reassembly. . . . . . . .

10.

11.

Test Function(SWI-7: ON) . . . . . . . . .

12.

Specialservice

13.

Circuitdiagram

14.

Installation

tool. . . . . . . . .

. ...*......*...*...*..*..*.**..*....*””””””””

procedureof

in-linecable . . . . . . . . . . . . . . . . . . . . . . . . . . ..43

● . .

● * ● ● . ● ~

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

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

... ... ...

.O*. .**~=*. *.. Q...

... .*. ..** ... .**. ... *.~*. ~~

... ... .. O........**.**.****

1

1
2
3
5

... ... ... ... .*. .*. .*** 0*~*~

,.. ... ... *Q. ... ... *.** ..Q.

10

printer . . . . . . . . . . . . . . . . . . . . 14

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

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

● ... ... ... m~o.... **** . . . . .

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

18
22
34

35

37

9

15.

Installation

procedureof

SHARP CORPORATION ‘“rafiersa’esse’’’ice”y’y-

ER-04RP for moungingon a wall . . . . .......43

This document has been published to be used

contents are subject to change without hotice.

The

.—.l.—

——”-..”-.——————————

1. General

The ER-04RP 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-04RP is nearly equal to and compatible with the
current model ER-03RP, except that the ER-04RP have an auto cut­ter feature.
The ER-04RP is available as a des~op or can be mounted on a wall.

System diagram

\\

-

ECR

1) The maximum number of option units depends on the system’s
application program.

2) The total cable distance should not exceed lkm.

SRN(lMbps)

-r

ER-04RP

ECR

Y

ERU4RP

+

ER-04RP

2. Specification

External interface

1)

SRN interface ...

Control method

2)

Controlled by the command from the host (ECR, POS)

Printer

3)

Model: DP-614 serial dot printer
Printing area:

Font:
Print color:
Print speed:
Linefeed:

Kinds of printing character sizes

4)
Normal, Double size

Auto paper cutter

5)

Print data protection

6)
Backed up by capacitor.

Installation

7)
Desktop or mounted on a wall

Cabinet

8)
Moisture tight

Print paper

9)
Kind: Plain paper
Size: 76.0 k 0.5mm, paper roll diameter 83mm

Thickness:
Weight:

Ink ribbon cassette

10)

Color: Two colors of black and red

Character set

11)

ASCII conforming 7-bit/8-bit character

12)

Operation mode

Self test
On-line (normal print mode)
Off-line (standby mode)
Print halt mode

one host, n units of printers

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

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

0.07-0.09

52- 64g/m2

13) Outlook

“n’’neswi’c’mk\

5$

Connector

14) Size/Weight

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 (*10°/0)50/60Hz
Max. 30W

16) Ambient temperature, humidity
O“C- 40”C(32-

300/0- 90Y0

17) Reliability

Printer (except dot head):
Dot head:
Ink ribbon: ApprcIx.2 million characters

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

@ AC cord assy

@ AC inlet An inlet for power input. Insert the con-

@ Power switch

@ Online switch

-1-

@ Line feed switch

Controlpanel

f \

POWER
ONLINE

I

ALARM

m

I‘IA

~b

ACpowerreceptacle

X 10.4”(D) X 4.9’’(H))

Paperoutiet

Powerswitch

Fig. 1-1

104”C)

MCBF 2.5 million line
50 million characters

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

nector 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.
When the switch is pressed during the
printer operation, the printer is set to the
deselect mode after printing the current
line.
Setting the power switch ON with the
online switch held down will initiate the

master reset operation.
Press the switch to feed the paper (in

0

m

In

n

.-

b

Ribbon/cover

Paper

cover

4

ER--04RP

Line feed switch

POWER indicator

(yellow green)

ONLINE indicator

(yellow green)

ALARM indicator

(red)

@ Connector

@ Printer cover
@ Ribbon cover
@ Upper cover
@ Bottom cover

Setting of Dip switches

3.

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

Press the switch to feed the paper (in
the deselect 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 occurred
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 cover to replace the paper.
Open the cover to replace the ribbon.

3-1. SW1 (DS1)

Swl -1 Used to select CR code enable/disable.

SW1-2,3,4 Used to select the diagnostic program type.

Swl -2

ON

OFF ON ON

ON

OFF

ON

OFF ON

ON

OFF

ON:
OFF: CR code disabled

SW1-3

ON

OFF
OFF

ON OFF Print test

OFF OFF
OFF OFF Line inspection program

●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 details of the diagnostic programs,
refer to Section 3-3.

CR code enabled

Swl -4

ON

ROWRAM test
Host terminal emuiation mode

ON

RAM verify

ON

Dip switch scan test

OFF SRN flag continuous transmission “1

SRN packet continuous transmission

Function

●1

SW1-5,6

SW1-7

SW1-8

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

Swl -5

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.

OFF

,

Used to set the auto cutter YES/NO.

The ON status of the switch indicates that the auto

cutter is used.

SW1-6

OFF

ON

ON

ON

ON

OFF

OFF

ON
ON

Diagnostic mode
Normal operation mode

I Auto cutter= used

Auto cutter = Not used

Conversion type
Type 1
Type 2

No code conversion
No code conversion

3-2. SW2 (DS2)

SW2-1,2,3,4 Not used. All fixed to ON.
SW2-5

SW2-6,7 Used to set the carrier off monitoring time.

SW2-8

Used to select the SRN transmission speed.

I

I

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.

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 timer setting is changed.

In the diagnostic mode, the timer is set each time, im-

mediately before the execution of the SRN basic test or
the host terminal emulation.

Not used. Fixed to OFF.

\ 480 Kbr)s

OFF

I

ON

SW2-6

OFF OFF 6.4mS 12.8mS

ON

OFF ON

ON

1 Mbps

SW2-7

OFF 4.8mS

ON 1.6mS

1 Mbps

3.2mS

Timer value

1

I

4

480 Kbps

9.6mS

6.4mS

3.2mS

-2-

ER+4RP

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 execution 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 as the
address of the remote station.
The address is set using a binary number with the SW3-1 setting as
the mst significant bit and the SW3-8 as the least significant bit.

3-4. Dip switches DS1-DS3 factory setup

SWITCH I

Swl -1

[

SWI-2
Swl -3

H

SWI-4 I

I

Swl -5

SW1-6
Swl -7
SW1-8

I

SW2-1
SW2-2

H

SW2-3

SW2-4
SW2-5 SRN transmission speed (1M bits)
SW2-6
SW2-7

i SW2-8 I Not used

H

I SW3-3 I

I

I

I CR code (disabled)

Selection of diagnostic program (line
inspection test)

Selection of conversion type (type 1)

\ Auto cutter (Yes)

~Carrier off timer (6.4ms)

SW3-1
SW3-2

SW3-4

I

Diagnostic mode (prohibited)

Not used ON
Fixed to All “ON”.

Terminal address (OOH)

Function

H

I SW3-6 I

1

I SW3-7 1

i

SW3-8

I

4

I

Default

,
!

------------

------------

1

!

------------

t

F

------------

I

------------

------------

t

I

~------------

------------

I

------------

L

I

P------------

I

~------------

OFF
OFF
OFF

OFF
OFF

OFF
OFF

ON
ON

ON
ON

ON
OFF
OFF
OFF
OFF

OFF
OFF
OFF
OFF
OFF
OFF
OFF

4. Disassembly procedure

4-1. Removal of upper cover and bottom cover

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

1)
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

2)

remove the bottom cover.

/

Upper cover

/

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.

1~

Printer mechanism

-3-

Fig. 4-2

-.........4.”-..-...-..-....”.--..---,.- ... .--.-.—.--.-—-—-”—-—,———————

ER-OZIRF

4-3. Removing the control PWB and SRN interface

PWB

Remove the bottom cover.
Unfasten the connectors (at six locations).

Remove the PWB holding screws (at four locations) and the con-

nector cover holding screw (at one place) to remove the PWBS.

PWB

Control

SRN interface

?

PWB

e’

Fig. 4-3

4-4. Removing the power supply

PWB and AC

power supply unit

Removing the power supply PWB

1)

● Unfasten the connectors (at three locations).

● Remove the screws M3xI0 (at two locations) and tapping

screws M3x8 (at two 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

/.

I

4-5. Auto cutter unit removal

● Remove the printer mechanism from the body.

● Remove E3 (two positions) shown in the figure.

● Pull the shaft in the arrow direction , and remove the auto cutter

unit. (Two spacers will come off at the same time.)

Auto cutter unit

pacer

ter mechanism

Fig. 4-5

4-6. 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 assemb­ly.
To remove the PWB alone, twist the PE sensor holder lug and
detach the PWB from the holder.

Lug

/

.

\

+

+

.

<’

Fig. 4-6

47.

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

\

Fig. 4-4

/

-4-

.....,.—w. ...m.”——

—.—.. .—.—-.—-....

—.—

..-..——

5. Circuit description

5-1. General

The ER-04RP is a remote printer using the SRN
work) as an external interface through which

electronic cash register and a POS tefiinal.
The remote printe; 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, an auto cutter circuit a printer
mechanism, and a power supply circuit for supplying necessaw
power to each circuit.

Fig.5-l shows a block diagram of the remote printer.

osc7.37m

r-iOh

I

I

\

AC115V

AC~V

[=1

panel

‘1—’1

I 1

L

ALno
culter

>

I

4

(Sharp Retail Net-

connected to an

mmm

VRAM
aupercapacitor

5-2. SRN control circuit

1) UOallocation and memory mapping
The

CPU used in the SRN control circuit is a single chip 8-bit C-MOS
microprocessor with an external memory.
In addition to general purpose 1/0 ports, the CPU has expansion 1/0
ports externally allocated on the memory space.

It has an address space of 64K bytes, with a ROM, a RAM, and
external expansion 1/0s peripherally arranged as shown in the at-

tached page.

The RAM has a capacity of 64K bits or 256K bits according to the
destination, the RAM size being checked by software.

Data and control commands are transferred to and from the SRN

through the registers in the SRN interface circuit which are ailocated

on the memory space.

The ROM has a capacity of 256K bits and contains control software

and CG data for character printouts.

2) CPU peripheral circuitry

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

an 8-bit latch HC373.
The ROM has a capacity of 256K bits, and the RAM 64K bits or 256K
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 oscillator is used as the CPU clock to provide a clock
frequency of 7.37MH2.

Fig,5-1 ER-03RP block diagram

“< 0. ,

( I

-6H) ;< “: ‘>

CI-5HI

1-4HI g

[

( 1-4*)

>

)

I

I

\ \

$

,

)

I

ROM

I I

272S6/S12

( I t 50CKf T 1

I

II

I

I
1

I

)

\

Ill

!1
!

—

Fig.5-2 ROM/RAM circuits

-5-

ER--O4RP

3) Connection with the SRN interface

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.

) 1 1

DO-D7

Ra

Wu

~(liuq

m(sdq

-

-m

*

ND(CS)

-ruuurlRIJ
Am

*

Ael

w

Itvour

DATA

fflc

(l MbPs)

w lap

10P -

w

ml

6P

I

b

I

Fig.5-3 SRN interfacelprinter controller signal diagram

Interface sianal descrit)tion

S~R

1.

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.

2.

RESET
Reset signal.
This signal is at a high during the power ready state (when
+5V*5% is secured) and low otherwise.

——

3.

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

4.

SRNS
SRN interface select signal

DO- D7

5.
Data bus

TRRQ

6.
interrupt request signal from the SRN interface to the controller

Power supply

7.

+5V : Logic drive power +5Vti”/0, 250mA
+12V: SRN line bias circuit power 12V~l Y0,150mA

‘RNS ~

Aao,l

\

10Pw

-

*

lop U&

b

r

+W (~)

+24V(0.M)
+12V(150rnA)

I

Printer con-

(P-11)

fi

i

4) Initial reset and power down interrupt circuit

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

storesnecessary data in

the RAM before going into the power down mode.

As shown in the timing chafi, 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 com­pleted in about 500msec.
Upon completing the execution of the backup sequence, the CPU
sends out signal RESET OUT through the port (P37), putting itself in
a hardware reset state to prevent it from operating in an unstable
condition.
Also, when the power down prwess is entered, the watchdog timer is
cleared, and WD is issued in 4msec, while in about 900msec a power
down reset is caused, thus providing a ttiple fail-safe mechanism.

v;

[1-4H1

1

,

[1.

().

Fig.5-5 Reset and power down interrupt circuit

Voc(5V)

t~

Abaut4.6V I

I

m

Povverdown
interrupt

7

m

Readdata

Writedata

+

max120ns

i

min50rts

T

MB62H149AC gate &ray timing

Fig.5-4 SRN intedace data write/read timings

-6-

P37

RESHOW

WD

J

+

I

Fig.5-6 Timing chart

5) Printer control circuit

When a low state of signal through the port P31 of the CPU, the

1)

motor starts to run with timing pulses appearing on the DP line of
CN5.

After the motor started, printing takes place in synchronism with

2)
the timing that the P port P34 turns from high to low.

3)

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

4)

Paper feed is done when the port P43 of the CPU goes low at a
prescribed timing.

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

5)
low at a prescribed timing.

CN3
CN3 -6
cn3
CN3 -7

CN3 -4

CN3 -5

CN3 -3 #

CN3 -1
CU3 -e
CM; -9
CN3 -Id
CM3 - 1s

CN3 -2

CN2 -1
CN2 -2

[

CN2 -4
[N? -6
CN2 -9

1

(2- 19)

,“”

TFII 1OK-9

08 i 8 .10

23 { 09 ) 9 20

-- 1

M: B- 12-15

ER44RP

CPU

1C5

2 g RRS
3 ~ R9S
4~ RR;
S g RF15

RRS

6V
7

Q RQS

e ~ RR6

RQS

9V

RQS

102

I 1 ,, ,3, ,

m,~

%-%

I

74HC: 4

IC12

J

Ra4

3~

,1

4

?4HCI

H

F28

0 H14Z

1OK-8

Ral

2
3 RR I
4 RR! 7
S RQI
6 RR1
7 RP! ‘

RR1

E

Rnl

9

:: ~:;

1s P22
16, P23

17

10
19,
20,

‘ XIN

I

P24
P2S

P26

?27

P30
P31
P32
?33

p~,
P?s

p~s

Xoul

Vcc

V55

Plo
PI:

?13
P14
Pls
PI 6
P1’

PI?

(CNTR)P02

9134

a14 4
Flls 4

VREr

z

SYNC

m
m

P03
P04
Po!i
P06
P07

1

F

40

●

E

Fig.5-7 Printer control circuit

6) Paper end sensor circuit

Fig.5-8 shows the paper end sensor circuit. A reflection type
photointermpter is used as the sensor. When the paper is present,
the light reflected from the paper strikes the phototransistor, there­fore, 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

-—-—-—-—-

-7-

[1

I 1

1

Fig.5-8 Paper end sensor circuit

I

CPU

’40

.

ER-04RP

7) Interface circuit with the operation panel
As shown in Fig.5-9, the operation panel circuit includes switches; an

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

to the output ports through the drivers.

--—-—-—-—-—-—­I

I

I

-- —._

1

I

I

A

L

1

—. —-—-—-—

Vcc

b

1 i

I
I

SwI—

r“

+ SW ~

~

I
t

L- —-—-—-—-—-—-- ;

ON-LINE

FEED

.

A

A

I

T

T T

1

P42

t-

P43

b ‘

L.–._._.–-–.–.–

Fig.5-9 Operation panel circuit

Cutter control

8)
me cutter control is as shown in Fig. 2-9. “M” on the cutter side

means “Motor” and “S” means “Switch.’l The control circuit inputs X
and Y are controlled as shown in the table below to rotate the motor
forward or backward.

Forward
x
Y

Fig. 2-8 shows the timing chart. On falling of S in forward rotation of
the motor, the cutter returns t~ its home position and the motor stops.

In full cut, the motor rotates forward only. The blade goes and returns
the home position once. In partial cut, the motor rotates forward, and
rotates reversely midway during cutting, and rotates forward again to
stop at the home position.

H

L

Reverse stop

L

H

L H
L

stop

H

5-3. SRN interface circuit

Circuit description

1)

The SRN interface is allocated at the 1/0 space address, with the
printer controller as the host CPU, and transfers data for interfacing

using seven interface registers.
Data is transferred to and from the external devices at IM bps using
a coaxial cable. (RG-58U)

* f

BUS

IF

Printer controller

CPU
Z-80

~ y-

ROM
RAM

DMA

ADLC

link MOD.

controller

A

T

Driver

Receiver

qlq

I

1Mbps
DATA

1

Fig.5-10 SRN intedace block diagram

2) Adjustment

The duty adjustment of the interface is carried out in the following

manner.

1. Set the oscillator.

Ou@ut impedance

Check on oscilloscope

5V

Ov

IMHz

P-P 5V

a

b

CPU

II I ,..

Fig 2-8. Time chart

1

Fig. 2-9. Cutter control circuit

OwY

2oms

–-~—--

_–l–

““+

“- +

+

‘0.w sTo.5p Sq

2, Connect a dummy network to the printer.

Connect the oscillator and the oscilloscope as shown below.

-8-

Fig.

5-11

Fig. 5-12

ER-04RP

3. Adjust the VR1 5~ potentiometer to obtain the fOi10win9
waveform.

w T1 : 580nsec-620nsec

0.61Js0.41.Is

Fig. 5-13

4. Power supply circuit
Power supply circuit (secondary side)

1)

This power supply circuit supplies the logic drive power of
5VDC, the printer mechanism drive power of 24VDC, and the
SRN interface bias circuit drive power of 12VDC. CN2 is con-

nected to the printer control PWB, and CN3 to the SRN inter-

face PWB.

ICI is a regulator IC of low saturation voltage type which sup­plies 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 T1A250V, and protects the 5V power from overcur-

rent.
Noise filter circuit (primary side)

2)
The noise filter circuit uses a common mode type filter to
eliminate noise generated from the AC power supply as well as
radiation noise from the printer and thus assure stable opera­tion of the printer.

........

4

N

ACIN

T

“ 1

cl — ; \ C2
IMT ; : T104 C4 ,

T2: 380nsec-420nsec

-N

~c3222

h

ACOUT

6-2. How to load the paper

Use paper of prescribed standard.

6-2-1. Paper lead edge finish

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.

o

x

rlr

6-2-2. How to load the roll paper

Load the paper as shown below.
Correct

o

-

Incorect

x

—

PlA~21A

Fig. 5-14

6. Printer unit description

6-1. Hints and tips in handling the printer

6-1-1. Hints in using the printer

Do not operate the printer when the printer is not loaded with

(1)

paper and ink ribbon. Printing without paper or ink ribbon will
damage the printhead and platen surface, deteriorate the print
quality, and shorten the printer life.

(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 carriage drive pipe will be subjected to overioad when
the print head is moved by hand, leading to timing misalignment
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.

(4)

Printed circuit boards are mounted in the bottom of the printer.
Take care so that the printed circuit boards do not come in
contact with the case or foreign materials do not adhere to the
boards.

6-1-2. Hints in storing the printer

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

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

6-2-3. How to loadthe 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.

6-2-4. How to remove the paper from the printer

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

Pull out the paper upward. (For friction type only)

(1)

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

ly,the paper may become jammed in the Printer.

o

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

(2)

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

Eject the paper by electrically operating the printer (pressing the

(3)

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.

-9-

-,,.,.,-....1.-.-.. --...—..-”-.-----..-”------—. .!.””””..--. -—”.-.. -—,———————

ER+4RP

6-3-1. How to install the ribbon cartridge

Tghten the ink ribbon by rotating the ribbon cartridge knob

(1)

clockwise (arrow direction).

(2)

Fit the ribbon catiridge into the ribbon plate (or frame) with the
ribbon inserted between the ribbon mask and the print head.

After the ribbon cartridge is installed in position, rotate the ribbon

(3)

cartridae knob once again in the clockwise direction (arrow
directi~n) to remove the slackness in the ribbon.

How to remove the ribbon cartridge

6-3-2.

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

there is difficulty in removal, push the cartridge to the right or left and

unlock the hook on one side before pulling up the cartridge for

removal.

6-4. Cleaning

(1)

After using about 10 rolls of paper or after six months of use,
clean the printer to remove remrding paper dust and dirt. It is

desirable to clean by vacuuming (use a vacuum cleaner).
Thoroughly clean eve-y part of the printer by vacuuming dust
and dirt.

(2)

Use alcohol or benzine to wipe off dirt.

trichiene, or ketone detergents as these

damage the plastic parts.

7.

Auto cutter unit

Never use thinner,
may deteriorate or

7-1. Maintenance and handling

7-1-1. Note for handling

(1)Note or use

Do not use this unit to cut paper other than the specified record­ing paper. Do not pull the paper while cutting it. It may damage
the blade, shortening the life.

(2) Note for storage

Avoid dust, foreign materials, high temperature, and high

humidity.

7-1-2. Cleaning

(1)Remove paper dust from the unit occasionally.

It is advisable to use a vacuum cleaner to remove dust.

(2) Use alcohol or benzine as washing liquid. Do not use thinner,

trichloroethylene, ketone, etc. which may damage the plastic
pars.

(3) After cleaning, lubricate as necessary.

7-1-3. Lubrication

There is no need to lubricate the unit until 150,000 cuts. If, however,
the blade becomes dull, or if cleaning has removed oil too much, or

when disassembly, assembly, or replace is performed, lubricate the
unit.

Gear pivot
Lock lever shaft
Crank pin
Movable blade sliding section

7-2. Mechanism and operating principle
7-2-1. General

The AC-2 and AC-3 are designed for use as the small-size dot printer

DP-600 and DP-505. It features a compact design.
The mechanism of this unit is composed of the four sections: the
frame section, the power transmission section, the detecting section,
and the movable blade mechanism section.

Maltemp
Maltemp
Mo grease
Mo grease

Brush
Brush
Brush
Brush

7-2-2. Mechanism and operating principle

Power transmission mechanism section

(1)

Cutter gear \

Fig.1

w

Fig. 1

The reduction gear train of this auto cutter unit is composed of

the motor gear attached to the motor shaft, the worm, and the
cutter gears (2 pcs.). When the motor gear turns one rotation,
the cutter gear turns 7/520 rotation (nearly equal to 1/74 rota­tion). (Fig. 1)

Detecting section

(2)

The detecting section is composed of the mechanical contact

switch and the cutter gear cam.
It detects the home position of the movable blade (Fig. 2), the
turn position in partial cutting (Fig. 3), and returning of the mov­able blade. When the blade is in home position, or when it

returns, the switch is ON. The position where the switch turns
from ON to OFF is the turn position of the blade in partial cut­ting.

Fig.3

(

+;

&)

Fig.2

Cam

/

Cutter gear

Fig. 2

Movable blade mechanism

(3)

Rotating movement is converted into a linear movement by the
crank pin to drive the movable blade to cut recording paper.

“ Crank pin

In full cut, the crank pin turns one rotation to return to the
home position. The movable blade moves 12mm.

@ Partiai cut

I YvAvAv~vAvAv/

Fig.5

In partial cut, the crank pin turns reversely to the home posi­tion when the switch signal is received.
The movable blade moves 9mm.

Fig. 4

Fig.5

I

-10-

7-3. Repair

For troubleshooting, descriptions are made for the following items.
Troubleshoot according to the descriptions, locate the trouble posi­tion, and repair it.

7-3-1. Phenomenon

Search this column to identify the trouble phenomenon.

7-3-2. State
Thesame

7-3-3.
me possible causes are listed in this column. Check this mlumn for

the cause.

7-3-4.

This

7-3-5.

Repair the trouble according to the description in this column.

trouble may have different states. Check this column.

Cause

Check position and procedure

column states how to inspect to identify the cause.

Repairprocedure

ER-04RP

Phenomenon

1. The motor does
not rotate.

2. The recording

paper is not cut.

State

B The motor does not

rotate even when the
motor rotation command
is delivered.

● When the motor rotation

command is delivered,
the motor stads rotation
but stops soon.

“ The blade tries to cut,

but returns midway.

“ Abnormal operation of

the movable blade

s The movable blade

does not move smoothly

● The blade does not cut

well.

Cause

1. Abn~rmal input power to
the motor

2. Motor defect

3. The rotating section is

locked by foreign materials.

1. Defective detecting switch

1. Improper recording paper

2. Foreign materials in the

path of recording paper

1. Deformed cutter bar

2. Paper dust clog or poor

lubrication on the blade

slidin~ section

1. Breakage or wear in the
movable blade

Check position and

Drocedure

● Check the input power.

Use a tester to check
across the motor.

● Apply the rated voltage ● If the motor doesn’t

across the motor and
check if it rotates.

● Remove the cutter cover “ Remove foreign

and check the moving

Repair procedure

I* Ifthe voltage is outside

the specification, repair
the power supply circuit.

rotate, replace the
motor with a new one.

materials.

section.

● Use a tester to check

the switch output.

● If it is abnormal, replace

the switch.

I

● Check the thickness of ● Use the specified

recording paper. recording paper.
(Max. O.lmm)

s Check the path of s Remove foreign

remrding paper. materials,

“ Remove the cutter cover

and check for replace it.
deformation.

● Remove the cutter cover

and check for dust. lubricate the section.

● Remove the movable

blade and check the worn down, replace it.
blade tip.

● If the cover is deformed,

● Remove paper dust and

● If the blade is broken or

-11-

ER44RP

7-4. Disassembly and assembly
7-4-1. Disassembly procedure

Reverse the assembly procedure for disassembly.

Assembly procedure

7-4-2.
Follow the assembly instructions shown below.

“Fig. No.” is the disassembly figure No.

Assembly

procedure

1

2

3

4%.

s% E3 6

6@

7*

8*

9

10 E 2.5

11

12

Assembly part name

Cutter frame ass’y

Paper guide

X 8

M2.6

Lock lever R ass’y

Lock lever L ass’y

E3

Lock lever SP

‘ Cutter gear ass’y

Motor ass’y

Worm ass’y

x2

x2

Fig. No.

–

1

2

3

4

5

6

7

8

9

10

11

: ‘}

Assembly procedure and note

b

,,

Lubricate the lock lever shaft. (Maltemp)

f

A

A

Hook the lock lever SP in the lock lever side first.
Lubricate the gear shaft. (Maltemp)

Arrange so that the crank pin and the gear shaft are on a line.

---crankPin

Lubricate the worm shaft. (Maltemp)

X 5

13

14

15

16 Cutter SP 15

17 Guide plate

18 Movable blade 17

19 Cutter cover ass’y 18

M2.6

X 8 (SW)

M2

Insulation locktie

20 M2.6X 8

21

Parts marked with ““x’ are not required for the AC-3.

E3

x2 12

x2 13

x2

x2

14

16

: T

4

A,

‘l—-

1

Lubricate the teeth of each gear. (Mo grease)

Lubricate the movable blade and the crank pin. (Mo grease)

A

Check that the guide plate and the movable blade are
securely engaged with the guide shaft and the crank pin,,

3

6

and attach the cutter cover.

-12-

/-12

\

/–17

,—14

7

/

I

.9

/-18

I

.0,

/

I

-13-