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

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... ... ...

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

... ... .. 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-

,..,,.... ....... .

... ..

ER+4RP

8. Overview and operating principle of the
printer

Overview

8-1.

8-1-1. 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)

8-1-2. General specification

1.

Printing method
Serial impact dot matrix printing method

Printing direction

2.
Bi-directional (unidirectional for graphic printing)

3.

Printing speed

3.0 lines/see. Al 070
(At motor voltage +25V, +25”C)

4.

Print format

1) Character matrix 7x7 (including half dots)

2) Dot composition

180 (360) dots/line

Numbers in parentheses include half dots.

3) Print columns and character

40 columns 1.4(W) x 2.4(H)mm

5.

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

1) Voltage:
Resistance:

Paper feed

6.

1) Voltage:
Resistance:

2) Paper feed pitch

3) Quick paper feed

7.

Recording paper

1)

Type Friction type: Roll paper

Pin wheel type: Fan fold paper

Kinds of paper

2)
Recommended paper

3)
(Cutforrn paper) 45-55kg/l 000 sheets(1091x788mm/sheet)
(Copy paper) Non-carbon paper
Friction type: One original + one copy
Pin wheel type:

Inking

8.

9.

10.

Motor

Printhead

Special cartridge ribbon, re~black two-color or black
monocolor

DC brush motor

Voltage: 24~1VDC

Current: Peakcurrent Approx. 1A

Number of wires:9

Wire diameter:
Wire pitch:

Solenoid:
Resistance:

size

24tl VDC

33A3Q (25tC)

24~~VDC (across solenoid terminals)
33*3Q (25”C)

4.23mm (1/6”)

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

76mmH.5mm (width)
@83mm(outer dia.)

Width 76mm (3”)to 89mm (3.5”)

Plain paper and non-carbon paper

One original + two copies
Total thickness 0.2mm max.

Average current 0.2A max.

().smm

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”(W) X5.35”(D) X2.5(H))

Approx. 690g (1.5 Ibs)

50 million characters

oto +50”C

8-2. Mechanism and operating principle

8-2-1. Outline of mechanism

The printer mechanism consists of the following nine blocks.

Frame block

(1)

(2)

Motor block
Powertransmission mechanism block

(3)

Sensor mechanism block

(4)

Head feed mechanism block

(5)

Printhead mechanism block

(6)

Paper feed mechanism block

(7)

Ribbon mechanism block

(8)

Color change mechanism block

(9)
8-2-2. Mechanism

Of the above nine blocks, seven mechanism blocks excluding the
frame and motor blocks are described next for their structures and
operating principles.

Power transmission mechanism block

(1)

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.

Head feed gear train

This gear train consists of a pulley drive gear, which is driven

by the drive gear, a drive pulley, and an idle pulley. The drive
pulley drives a timing belt SA to feed the printhead.

Idle pulley

and operating principle

Reduction gear

gear

Drive gear

rive gear

-14-

@ Paper feed gear train

This gear train mnsists of a PF slip gear, which is coupled by
friction to the drive gear, a PF drive gear BK, which is coupled
via a clutch to the drive gear, a clutch gear BK, a PF reduction
gear, and a PFshaft gear, to transmit power to the PF shaft.

Drive gear

\

SI

PF

@ 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
as the motor rotates.

Drive pulley

@ Ribbon reset gear train

\n ~

Ribbon reduction gear

me 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.

PF drive gear BK

/ /

\

Clutch gear BK

PF ~eductiongear

Drive gear

PF shaft gear

ER+4RP

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 fomed with a home position sensor
pulse disk having one slit,
bound to the connector 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
control the print solenoid, paper feed, and mlor change. On

the other hand, the home position 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 munt stafi
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 block consists of an RP switch SA which uses a

mechanical leaf switch attached on the bottom of the bottom

plate BK. As the carriage passes the switch, the actuator is

turned on and off to output a signal (RP). The signal 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 (comprising a timing belt and a carriage drive pin),
the carriage, and the idle pulley. The carriage drive pin consists
of belt fixes A/B 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 SA runs in the clockwise direction
to horizontally 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.

and photointerrupters solder

reset cam

Ribbon

Reset cam ‘drivegear

(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.

RP sensor

/

Carriage

DP disk

HP sensor (photointerrupter)

BK

Itfix A

Tming

rriage drive pipe L

Tming belt SA

(4) Printhead mechanism block

The printhead mechanism consists of a nose assembly housing

nine wires, a solenoid base comprising solenoids and armatures
for driving the wires, and a cover for keeping the armature
stroke to a prescribed value.
When the selected solenoid is energized for about 450ms in
synchronism with the dot pulse, the corresponding armature is
pulled into the solenoid. The 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.

otor BK

nterrupter)

-15-

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

ER-04RP

Nose assembly’

(5) Paper feed mechanism

The paper feed mechanism consists of the paper feed power
transmission mechanism described in 2-2-2. (l)-(2), a paper
feed solenoid which controls the clutch mechanism, a PF trigger

lever, and a clutch cam. The PF shaft is driven to feed the paper.

The clutch mechanism has a spring clutch, consisting of a PF

drive gear BK, a clutch gear BK, a clutch spring, and the clutch
cam, to transmit the rotation of the clutch gear BK to the PF
drive gear BK.
Two paper feed methods are available for the printer, the friction

method and the pin wheel method.

Drive ge

PF slip spri

Print

In 1

‘T

PF drive gear BK

\Solenc)id base

PF shaft

\ ‘%

v

topper

spring

,PF shaft gear

eed
d

r lever

[Paper feed overload protection mechanism]

A safety mechanism is provided to prevent gear breakage
and motor coil burning due to the motor seizure in case
overload is applied to the PF shaft because of paper jam,

etc. The PF slip gear is coupled by friction to the drive gear
via the PF slip spring, and is so constructed that when the PF
shaft is subjected to a greater load than a prescribed torque,
it slips on the PF shaft to absorb the overload.

Side plate R

/

ive gear

Sll

PF

yl

[Paper release mechanism]

Tne PF shaft gear is coupied to the PF ratchet fixed to the

PF shaft so that the ratchet engagement is reieased when

the paper is puiied in the foward direction, thus aliowing the

paper to be srnoothiy puiied out. Aiso, if a knob is mounted
on the PF shaft, the ratchet engagement can be reieased by
puiiing the knob outward, thus aiiowing the PF shaft to be
freeiy rotated. in this situation, the paper can be fed in either
forward or reverse directions by rotating the knob.

PF

slip gear

Pivot drive gear

.Knob

—

PF

Clutch cam /

@ Friction type (Type D/P61’-’F*)

The friction type consists of two PF rollers fixed to the PF
shaft, pressure rollers press-contracting the respective PF

rollers, and pressure roller springs applying pressure to the

respective pressure rollers. Paper is fed by the friction force
acting between the PF rollers and the pressure rollers. Paper
can be inserted either from the rear or from the bottom.

Pressure roller

T

Pressure roller spring

Clutch spring

\

Clutch gear BK

-1
Bottom

‘Rear

—

PF ratchet

Ribbon mechanism biock

(6)

The mechanism biock consists of a ribbon cartridge in which an

endiess ribbon is housed, a ribbon feed gear train, and a ribbon
drive poie SA which is driven by the ribbon feed gear train.

When the motor is in rotation, the ribbon drive poie SA is con-

tinuously rotated via the gear train, to drive the ribbon gear
contained in the ribbon cartridge so that the ribbon is con­tinuously taken up.

The ribbon drive poie SA is coupied to the ribbon drive gear via

a ratchet, so that it can be rotated freeiy in the direction in which

the ribbon is taken up (in the forward direction). Therefore, the

cartridge knob can be rotated to take up the ribbon with the
ribbon cartridge instailed in the printer.

\

PF shaft gear

.

m

-16-

Ribbon drive gear

ER-04RP

The two-color ribbon cartridge (D type) is mounted on the ribbon

plate, and the mono-coior type (M type) on the frame.

Mono-color ribbon cartridge mounted in position

Two-color ribbon cartridge mounted in position

(7) Color change mechanism block (for D type only)

The mechanism block consists of a ribbon plate on which to
mount a ribbon cartridge, a color change lever, a color change
solenoid, a ribbon reset cam, and a reset cam drive gear.

In normal operating condition, the ribbon plate is locked in posi-

tion by the lower hook of the color change lever, holding the

black ribbon area in the printing position. When the color change
solenoid is energized through a red print command, the color
change lever is pulled in to disengage the lower hook from the

ribbon plate. The color change lever swings upward by the force

of the color change lever, hitting the upper hook of the color

change lever. The fibbon plate is thus retained by the upper
hook, setting the red ribbon area in the printing position for red
printing. When the printing is completed, the ribbon plate is

pulled downward by the ribbon reset cam, engaged with the
lower hook of the color change lever, and reset to the original
position (black printing position).
The timing is so set that the ribbon reset cam will be operated
when the printhead is in a non-printing area at the extreme right
or left, to avoid accidental resetting during printing.

Ior change

solenoid

[Safety mechanism]

If the ribbon gear binds because of a ribbon jam, the motor
may be subjected to overload, causing gear tooth breakage,

motor coil burning, and other troubles. To prevent such
troubles, the ribbon slip gear is coupled by friction to the
drive pulley via the ribbon slip spring, and is so constructed
that it slips in the drive pulley when the ribbon feed system is
subjected to overload.

Drive pull

Fixed

Ribbon slip spr

Ribbon slip g

Color c~ange spring

ge lever

% ~ib)on re,et cam

[Black printing]

I in

printing]

[Resetting]

I

table

Fixed

-17-

9. Troubleshooting

9-1. Repairing procedure

Repairs should be done in accordance with Section 3 “Troubleshoot­ing chart” after acquiring working knowledge of the operating principle

and construction of the printer.
Also refer to 8-2 “Con~ectOr and wiring di~9~arn’~”~hi~h ‘houid
facilitate the check and repair work.

9-2. Connector and wiring diagrams

9-2-1. Conn=tor diagram

/

L

Wiring diagram

9-2-2.

‘- ~up.:

ii

\

4 2 8 6 9 COMMON 7 5 3 1 F.G

Printhead SA

~...y>./[://

Head FPC

I

o

-

/

DC motor

i I

Connector C

L rlll I I

K , 1

6­7 4 24\’

+24V

8

6

s

ml~ ,

1..W”..

r’

13 FGND

I

17

\10

f

-=

!

1 r

FPFcoil

I

I Ill

Connector B

1

Connector A

Connector PWB SA

UKOG-6669RCZ

1

1

C:nnect:r A

It

I

11’

*

,

IIL

-

II

[

I I

11~

I

I

81+24
91+24V

10 +24\r

I

IS FCND

‘o control block

1[

Validation (option)

Connector PCB SA

1

I

Y

1 I

1 i

I

To control

block

I

I

Wiring diagram

T

m

RP sensor

I

1

m

Paper end (option)

-18-

9-3. Troubleshooting chart
9-3-1. Head feed trouble

Phenomenon

I

Carriage does not
move

Carriage does not stop

Motor does not run

Motor runs

Symptom

Possible cause

Motor defective

Applied voltage to

motor not normal

Connector PCBSA
defective

Paper jam

Printhead wire caught
in ink ribbon or paper

Foreign matter caught
in gear wheel train or
broken gear causing
action failure

Timing belt SAand

pulley out of phase

Carriage bearing
trouble

DPMP/RP signal

abnormal

DP/HPIRPsignal

abnormal

Trouble in mntrol block

ER44RP

Checking procedure

Apply rated voltage across soldered
motor leads @(red)and @(black) on
solder side of connector

PCB SA to check if motor runs.
Check voltage across pin 1 (@) and pin

2 (@) of connector A on connector PCB
SAto see if applied voltage is normal.

Check for continuity between pin 1of
connector Aand motor lead (red) and
between pin 2 and motor lead (black).

Remove printhead and check for

jammed paper or foreign matter.

Check if wire gets caught.

Manually rotate motor pinion to check if
gear train moves smoothly. matter, etc. or replace

Remove carriage BK and check if Adjust position of
carriage drive pin and pulley timing belt SA.
engagement is not out of phase.

Check if carriage rail (front and rear) is

lubricated and if carriage rail moves matter, etc. and apply
smoothly when turned by hand.

Check voltage applied to each sensor
and its output waveform. Also check replace sensor, or
connector PCB SA for continuity. replace connector

Check voltage applied to each sensor
and its output waveform. Also check replace sensor, or
connector PCB SA for continuity. replace connector

Check hardware circuit in control block

and wiring from control block.

Remedy

Replace motor.

Repair control block.

Replace connector

PCB SA.

Remove foreign
matter, etc.

Replace printhead SA.
(Also replace ribbon
cassette if wire gets
caught in ribbon)

Remove foreign

broken gear.

Remove foreign

oil, or replace carriage

BK and carriage rail.
Repair control block,

PCB SA.

Repair control block,

PCB SA.
Repair control block or

rectify wiring.

I

9-3-2. Printing trouble

Phenomenon

Cannot print (ail dots
or particular dots) normal failure

Symptom

Carriage motion is

Head FPCconnection Check connection of FPC. Firmly insert FPC to

Printhead SA defective

Improper mounting of Check mounting condition of ribbon.

ink ribbon

DP/HP/RP signal Check voltage applied to each sensor

abnormal and its output waveform. Also check

Trouble in control block

Connector PCBSA
defective

Foreign matter caught
in printing area

Deformation or Remove printhead SAand check ribbon
improper mounting of
ribbon mask

Possible cause

Checking procedure

Replace printhead SA with a new one
and check the result.

connector PCB SA for continuity.

Check hardware circuit in control block
and wiring from control block.

Check for continuity between connector
A and connector B. (Refer to 8-2. Wiring
diagram)

Remove printhead SAand check printing

area for foreign matter.

mask for deformation and mounting

condition.

-19-

Remedy

establish proper
connection.

Replace printhead SA.

Mount ink ribbon

correctly.

Repair control block,
replace sensor, or
replace connector
PCB SA.

Repair control block or
rectify wiring.

Replace connector
PCB SA.

Remove foreign
matter.

Replace or property
mount ribbon mask.

Phenomenon
~rinted characterstoo
ight

Symptom

No ribbon feed

I

+

Bi-directional printing
misaiiqnment than 3.5 coiumns (17

Misalignment greater
dots)

Misalignment inside of
2 dots (misalignment
inside of 0.3mm is

within specification)

Possible cause

Improper mounting of
ribbon cassette

Ribbon cassette
defective

t Foreign matter caught

in ribbon drive
mechanism or broken 1$moothiy.

1gearcausing action ‘

; faiiure
~Troubie in ribbon sii~

mechanism

improper gap
between printhead

I and piaten

Troubie in controi biock ‘ Check voitage appiied from controi biock

improper mounting I Try to shift RP sensor mounting position

~position of RF sensor

improper mounting Try to shift connector PCB SA forward or
position of connector backward to check if bidirectional

PCB SA printing misalignment is corrected.

Check mounting condition of ribbon
cassette.

Rotate ribbon cassette takeup knob in

, arrow direction to check knob operation

and ribbon takeup condition.

Manualiy rotate motor pinion in direction
toward you to check if gear train moves

; With ribbon cassette mounted in

position, manuaiiy rotate motor pinion in
direction toward you to check if ink
ribbon is taken up properiy.

Check gap between printhead and

piaten.

as weii as voitage added time.

to left or right to check if bidiredional

I printing misalignment is corrected.

Checking procedure

Remedy

Properly mount ribbon
cassette.

Replace ribbon
cassette.

Remove foreign —
matter, etc. and
replace broken gear.

~Repiace ribbon siip

mechanism.

Adjust gap.

Repair control biock.

Readjust RP sensor.

Readjust connector
PCB SA.

9-3-3. Paperfeed trouble

Phenomenon

Cannot insert paper

Paper feed does not
operate at ali or faiis
to operate sometimes

Paperfeed pitch

mproper

Symptom

PF coii does not puii in

PF coii puiis in

Paper feed pitch too
great

Possibie cause

Paper iead edge is

i bent or improperly cut ~and cut straight.
I Troubie because of

I non-standard paper I paper used.

Troubie because of
paper dust or foreign foreign matter. and foreign matter.
matter

improper ioading of
paper on pin wheeis

I
i Checkthat paper iead edge is not bent

I Checkthickness, width, and diameter of

. .

Check paper feed route for dust and

Check if guide hoies of paper are
engaged with pin wheeis properly

(symmetrically and without being

stretched too tight or compressed too

Checking procedure

I once again.

I Use paper of
I prescribed

Remedy

insert paper properly

specification.
Remove paper dust

Load paper properiy.

1ioose).

Gap between PF coii

i and PFtrigger iever is

too wide
PF coii defective

Connector PCB SA
defective

Troubie in control biock

Troubie because of
paper jam

Gap between PF coil
and PF trigger iever is
too smali

Trouble in paper feed
mechanism

Troubie in ciutch
mechanism

I

Check gap between PF coii and PF Readjust gap between
trigger iever. PF coii and PF trigger

iever.

Check resistance of PFcoil. Replace PF coil.
(Specification: Approx. 30Q)

Checkfor continuity between soider part

on connector PCB SAand connector A. PCB SA.

Check hardware circuit in control biock
and wiring from controi biock.

Check paper feed route and paper
ioading condition.

Check gap between PF coii and PF
trigger iever.

Check if paper feed mechanism has not
seized up because of foreign matter or
broken gear, or if PF siip mechanism is
generating enough force to feed paper.

Check ciutch gear BK, drive gear BK,
and ciutch sp~ng for abnormal wear and

Repiace connector

Repair controi biock or
rectify wiring.

Rectify paper feed
route and ioad paper
correctiy.

Readjust gap between
PF coil and PF trigger
iever.

Remove foreign
matter, repiace broken
gear, or repiace PF
slip mechanism.

Replace defective
pa~s.

-20-

,.—.”.-.””---—---”-””—,—————

9-3-4. Ribbon feed trouble

Phenomenon

No ribbon feed

Color change trouble

9-3-5.

Phenomenon

Jored printing

Symptom

Symptom

Nocolor change

Possible cause

Improper mounting of
ribbon casSette

Ribtin ca.SSette

defective

Foreign matter caught
in ribbon drive

mechanism or broken
gear causing action
failure

Trouble in ribbon slip

mechanism

Possible cause

Maladjustment of
color change timing

I

I

I

Checking procedure

Check mounting condition of ribbon
cassette.

Rotate ribbon cassette takeup knob in
arrow direction to check knob operation
and ribbon takeup condition.

Manually rotate motor pinion in direction

toward you to check if gear train moves

smoothly.

With ribbon cassette mounted in
position, manually rotate motor pinion in
direction toward you to check if ink

ribbon is taken up properly.

Checking procedure

Vith printhead positioned at extreme left,
:heck if registration mark (0)on ribbon
eset cam is aligned with engaging
losition with reset cam drive gear.

Registration
mark

Remedy

Properly mount ribbon
cassette.

Replace ribbon
cassette.

Remove foreign
matter, etc. and
replace broken gear.

Replace ribbon slip
mechanism.

Remedy

Realign registration
mark.

~

Mixedcolor printing

Mixed color printing

Maladjustment of CC
coil gap

CC coil defective

Connector PCBSA
defective

Trouble in control block

Maladjustment of

color change timing

Ribbon mask shape

I

defective

CC lever operation
failure

leset

cam drive aear Rib&n reset cam

with CC lever pulled in CC coil, check
gap between ribbon plate and CC lever.

Checkresistance of CC coil.
(Specification: Approx. 30Q)

Checkfor continuity between solder part
on connector PCB SA and connector A.

Check hardware circuit in control block
and wiring from control block.

With printhead positioned at extreme left,
check if registration mark (0)on ribbon
reset cam is aligned with engaging
position with reset cam drive gear.

Registration
mark

o+

+

A

m

Reset cam drive gear Ribbon reset cam

With paper and ribbon loaded in position,
carefully move ribbon plate up and down
to check if ribbon does not catch ribbon
mask.

Check if CC lever operates smoothly.

.

Readjust gap.

Replace CC coil.

i

Replace connector
PCB SA.

Repair control block
and rectify wiring.

Readjust registration

mark.

Replace ribbon mask.

Replace parts or
make corrections.

-21-

“,...,,,....1 ...-...”---- ... ”...... -.—. - ---

ER-04RP

10. Disassembly and reassembly

Observe the following precautions in maintenance.

PRECAUTIONS

(1)

When the printer is operating satisfactorily, do not try to
disassemble, reassemble, or adjust the printer mechanism
without proper reasons. Exerdse particular care not to loosen
the mounting screws on each part by accident.

After finishing inspection,

(2)

power-on to confirm that there is no abnormality.

Never try to print without paper and ribbon loaded in the

(3)

printer.

(4)

Check that the paper is loaded properly.
Care must be taken in maintenance so that parts, screws

(5)

used for maintenance will not be ieft in the printer.
When handiing printed circuit boards, avoid using gloves that

(6)

tend to generate static electricity.

(7)

Do not piace printed circuit boards directiy on the printer or
the fioor.

in disassembly and reassembly, check the ieads and cords

(8)

for damage and avoid such wiring as to cause strain to them.

10-1. List of maintenance tools

1.

Phiiiips screwdriver (iarge size) for 3mm size

2.

Normai screwdriver (smaii size)

3.

Tweezers

4.

Beit tension gauge (diai tension gauge) 10Og

5.

Scaie

6.

Soidering pencii

7.

Long-nose piiers

8.

Thickness gauge (0.5, 0.6mm)

9.

Lubricating pen

10.

Screw iock paint

11.

Osciiioscope

always check the parts before

10-2. Disassembly process

Disassemble and reassemble the printer in accordance with the fol­iowing disassembly procedure.

1. CC (coior change) coii SA

2. Ribbon piate BK
L

3. Printhead SA
J

4. PF (paper feed) coii SA

5. Drive gear
J

6. CC (coior change) iever

L

7. Detent iever

8. Carrier biock

9. Platen BK
L

10. PF (paper feed) biock
L

11. Paper pressure roller (10-3-11)

12. RP (reset puise) sensor SA (10-3-12)

13. Connector PCB SA (10-3-13)

(lo-3-1)

(10-3-2)

(lo-3-3)

(lo-3-4)

(lo-3-5)

(10-3-6)

(lo-3-7)

(10-3-8)

(lo-3-9)

(lo-3-lo)

-22-

L

14. Motor BK (10-3-14)

15. Ribbon feed biock

16. Timing beit SA

(10-3-15)

(10-3-16)

ER-04RP

Parts number reference Figure

N

-23-

\\

I

,,.,..,,,,

” .,.,-.... ---

ER-04RP

10-3. Disassembly/reassembly procedures

Work on disassembly/reassembly of each block in accordance with
the disassembly/reassembly flow.

NOTE: Reference numerals used in text
(Example) Connector PCB SA(~)

The reference numeral 5-2 indicates the figure number in
the attached drawing “(Fig. 9-l). Proceed with work by

referring to the drawing.

IDisassembly/reassembly flow]

CC coil SA (Section 10-3-1)

T

Disassembly

J

Ribbon plate BK

Reas~embly

1.

10-3-1. Disassembly/reassembly of CC (color

change) coil SA

I

‘ Tools

Phillips screwdriver
Soldering pencil

[Disassembly procedure]

1. Remove the holding screw (5-14).

2. Disengage the cord from the cord holder pawl.

3. Unsoiled the cord from the connector PCB SA (5-2) using the
soldering pencil.

[Reassembly procedure]

Reverse the disassembly procedure.

However, the following adjustment is necessary.

ADJUSTMENTS

Move the printhead to the center of the carriage rail so that the CC

coil core contacts the CC lever as shown by (A) in the figure below.

Move the CC coil in directions indicated by arrows e and + to adjust

the clearance between the CC Iever and the ribbon plate to 0.2-

0.5mm.

Screw lock

coil core

CC

CC lever

Ribbon plate

I

[Disassembly procedure]

1, Remove the CC coil holding screw (5-14) to remove the CC coil.

2. Remove the two color change springs (6-2).

3. Disengage the portion A while lifting up the color change lever
(6-3), and then, disengage the hinge (portion B) on the right side
of the ribbon plate (6- 1).

Portion

Portion B

4. Slide the ribbon plate to the right, and disengage the hinge (por­tion C) on the left side to remove the ribbon plate.

[Reassembly procedure]

Reverse the disassembly procedure.
NOTE: Take care not to deform the ribbon plate BK when reassem-

bling.

10-3-3. Disassembly/reassembly of printhead SA

(Refer to drawing for F type)

[Disassembly procedure]

1. Remove the flat cable from the connector. Work is made easier if
the flat cable is removed from the end.

2. With the lock lever released, extract the printhead SA (3-16) up-

ward.

[Reassembly procedure]

Reverse the disassembly procedure.
NOTE: Check that the flat cable is not in contact with the HP and DP

discs.

10-3-2. Disassembly/reassembly of ribbon plate BK

Tools

Phillips screwdriver

Tweezers

10-3-4. Disassembly/reassembly of PF (paper feed)

coil SA (Refer to drawing for F type)

Too!s

Phillips screwdriver

Soldering pencil

IDisassembly/reassembly flow]

CC coil

SA (Section 10-3-1)

Disassembly Rea~embly

I

&

PF mil SA

-24-

II

””””. . .

. . . . . .—. — . - ---

...

[Disassembly procedure]

1. Remove the holding screw (5-12).

2. Disengage the cord from the cord holder pawl.

3. Unsoiled the cord from the connector PCB SA (5-2) using the
soldering pencil.

[Reassembly procedure]

Reverse the disassembly procedure.
However, the following adjustment is necessary.

ADJUSTMENT

As shown in the figure below, move the PF coil in directions shown by
arrows + and ­PF coil SA and the PF trigger lever to 0.1- 0.2mm with the tiP of the

PF trigger lever overriding the clutch cam as shown by (A).

Clutch cam

o

Q_,@

(A)-

PF trigger lever

to adjust the clearance (B) between the core of the

Core of PF coil SA

\

0

0

/

%

“~

0.1-O.2dm

%

ER-04RP

Remove the ribbon reset cam (4-26).

4.

Remove the ribbon reset cam drive gear (4-25).

5.

Remove the E-ring (4-14).

6.

Remove the clutch gear BK (4-12).

7.

Remove the clutch cam (4-11).

8.

Remove the clutch spring (4-13) by rotating it counterclockwise.

9.

Pry off the PF reduction gear (4-15) with the normal screwdriver.

10.

NOTE: Takecare not to ruin the teeth of the PF reduction gear.

Remove the PF drive gear (4-10).

11.

Remove the drive gear (4-5), PF slip gear (4-6), and PF slip

12.
spring (4-7).

Remove the reduction gear (4-4).

13.
Remove the motor pinion (4-3).

14.

NOTE: The motor pinion is glued to the motor shaft. Remove

the motor pinion taking care so as not to bend the motor

shaft or ruin the teeth of the motor pinion.

[Reassemblyprocedure]

Reverse the reassembly procedure.
However,the following adjustments are necessary.

NOTE 1: Check the backlash amount for engagement of the gears.
NOTE 2: Use screw lock paint to fix the motor pinion in place.

ADJUSTMENT 1I

The following adjustment must be made when reassembling the rib-

bon reset cam. Adjust and assemble in accordance with the following
procedure.

As shown in the figure below, move the carriage to the extreme
left end of the frame BK by manually rotating the clutch gear.

In this situation, adjust the position so that the “R” cut portion on

the pulley flange faces to the right.

10-3-5. Disassembly/reassembly of drive gear

(Refer to drawing for D type)

Tools

Normal screwdriver (small size)
Tweezers

IDisassembly/reassembly flow]

-

[Disassembly procedure]

Reassembly

1.Remove the E-ring (4-18).

2. Disengage the hook (frame
(4-17), and remove the PF
spring (4-17).

3. Remove the E-ring (4-27).

side) of the PF trigger lever spring

trigger lever (4-16) and PF trigger

Carriage

Frame

\

Pulley flange

With the position adjusted in the above step o, reassemble the

@

ribbon reset cam so that the registration mark (0) on the cam
faces the center of the reduction pivot.

Reduction pivot center

\

Ribbon reset cam registration

/

portion

t

-25-

ER-04RP

IADJuSTMENT 21

To reassemble the PF reduction gear and the PF drive gear, engage

one of the longer teeth of the PF reduction gear with the PF drive
gear (as shown by arrow) and push it in until it snaps into place.

gear

Reduction gear

Drive

/

gear

ADJUSTMENT 3

Reassemble the PF trigger lever with the hook A of the PF trigger
lever spring engaged with the frame.
Next, engage the hook B of the PF trigger lever spring with the PF
trigger lever using tweezers or other appropriate tool.

/

Frame

ed with hook B
of PF trigger
lever spring

O

Motor BK

/

Motor pinion

Adjusting direction

A

Pull out motor pinion in arrow

direction to disengage it from

reduction gear

B

10-3-6. Disassembly/reassembly

lever

Tools
Tweezers

IDisassembly/reassembly flow]

Drive gear (Section 10-3-5)

?

Reduction gear

/

of CC (color change)

IADJUSTMENT 4
After reassembly, make test printing, and if misalignment is noted in

bi-directional printing, make the adjustment in accordance with the

following procedure.

cProcedures

Adjust the reduction gear engagement with the motor pinion so
that no misalignment occurs in bi-directional printing.

<Method of adjustments

Make adjustment in accordance with the table and figures below.

Phenomenon Method of adjustment

H H H-----H —

H H ~.----~ —

Adjust engagement with the
reduction gear by rotating the
motor pinion in direction shown
by arrow A in the figure below.

Adjust engagement with the

H H H-----H — reduction gear by rotating the

H H H-----H —

motor pinion in direction shown
by arrow B in the figure below.

!

Disassembly

I

+

CC lever

T

Rea~embly

[Disassembly promdure]

1. Disengage the hook of the CC lever spring (6-4) from the frame
(1-1).

2. Remove the CC lever (6-3) and CC lever spring (6-4).

[Reassembly procedure]

Reverse the disassembly procedure.
NOTE: As shown below, hook up the CC lever spring to the CC

spring retention hole of the frame BK, and check that the CC

lever moves lightly with the CC spring force.

-26-

ER-04RP

10-3-7. Disassembly/reassembly of detent lever

Tools

Tweezers

IDisassembly/reassembly flow]

-

=

[Disassembly procedure]

1.Disengage the hook of the detent lever spring (4-9) from the frame

(l-l).

2. Remove the detent lever (4-8) and spring.

[Reassembly procedure]

Reverse the disassembly procedure.
NOTE 1:

As shown below, hook up the detent lever spring to the
square spring retention hole of the frame BK, and check
that the detent lever moves smoothly.

Detent lever

[Reassembly procedure]

Reverse the disassembly procedure.

10-3-9. Disassembly/reassembly of platen BK

Tools

Phillips screwdriver
Normal screwdriver (small size)
Long-nose pliers

Thickness gauge

IDissssembly/reassembly flow]

Printhead SA (Section 10-3-3)

I

Disa~embly

I

+

Platen BK

[Disassembly procedure]

1. Remove the paper pressure SA (2-2) by pushing the holding
pawls in arrow direction using the normal screwdriver.

Rea~embly

I

1

u

Detent lever spring position

NOTE 2:

10-3-8.

For graphic type, reassemble the above before reassem­bling the PFshaft BK.

Disassembly/reassembly of carrier block

Tools
Tweezers

Normal screwdriver

\

IDisassembly/reassembly flow]

=

6

[Disassembly procedure]

1.

Move the carriage BK (3-1) to the center of the printer carriage
rail, and remove the E-ring holding the carriage rail (3-12) at the
platen side.

2.

Pull out the carriage rail (3-12) to the left.

3’

Remove the cartiage BK by lifting up its front side.

4.

Remove the E-ring (3-13) holding the carriage rail (3-12) at the
motor side.

5.

Pull out the carnage rail (3-12) to the right.

Holding pawls

2. Remove the two holding screws (3-15).

3. Remove the platen BK in frontward direction.

[Reassemblyprocedure]

Reverse the disassembly procedure.
NOTE 1:

NOTE 2:

NOTE 3:

NOTE 4:

The following adjustment is necessafy after reassembly.

Fit the guides of the platen BK onto the projections (on
right and left sides) of the side frame to reassemble it in

place.

Set the platen BK in the position where the widest head
gap is achieved, and temporarily fix it there with holding
screws.

When reassembling the paper pressure SA into the frame
BK, make sure that the holding pawls firmly engage the
frame BK.

Remove the ribbon mask (3-2) before reassembling the
carriage BK in position.

SA

-27-

ER-04RP

IADJUSTMENTI

Measure the gap between the printhead and the platen with the
thickness gauge, and move the platen BK back and fotih to adjust the
gap to 0.55mmH.05m-m at right and left ends as well as at the
center.

After the adjustment, tighten the holding screws to firmly fix the platen
BK in place.

NOTE: Fit the ribbon mask after the above adjustment.

10-3-10. Disassembly/reassembly of PF (paper

feed) block

I Tools
~Normal screwdriver (small size)

Long-nose pliers

Tweezers

IDisassembly/reasemblY flow]

CC coil SA (Section 10-3-1)

10-3-11.

Disassembly/reassembly of paper
pressure rollers

Tools
Tweezers
Normal screwdriver

IDisassembly/reasemblY flow]

Printhead SA (Section 10-3-3)

F

Y

Disassembly

L

Paper pressure rollers

Reassembly

I

‘r

Reassembly

I PF coil SA (Section 10-3-4)

Disassembly

.L

PF shaft BK

II

I

II

[Disassembly pro-ure]

Remove the E-ring (2-8) holding the PF shaft BK (2-5).

1.

Push the bearings (gearwheel train side) installed on the right and

2.
left sides of the frame (l-1) toward the inside to remove the PF
shaft BK (2-5), PF shaft washer (2-7), PF shaft bearing (2-6), two

pin wheel washers (2-3) (for P type), and two pin wheels (2-13)
(for P type).

Using the long-nose pliers, unbend the crimped edges (four lma-

3.

tions) of the side frames holding the rear plate (2-4) and remove
the rear plate (2-4).

Remove the pin wheel guides (2-14, 2-15) and the lock levers

4.
(2-16, 2-17).

[Reassemblyprocedure]

Reversethe disassembly procedure.
NOTE 1:

NOTE 2:

NOTE 3:

NOTE 4:

PF shaft bearing

Observe the direction in which to assemble the pin wheel
washers. (For P type only)

Install the pin wheels to the PF shaft so that the pins on the
right and left pin wheels are aligned with each other.

Check to ensure that the PF shaft bearings move lightly
and smoothly.

Observe the direction in which to assemble the washers.

Washer

I

\

Q

b

[Disassembly procedure]

1. Remove the two paper pressure rollers (2-3) from the paper pres­sure roller springs (2-4) using the tweezers.

2. Insert the normal screwdriver to extract the spring upward.

[Reassembly prmedure]

Reverse the disassembly procedure.
However, the following adjustment is necessaty.

iADJUSTMENT!

As shown in the figure below, lightly press the center of the paper
pressure roller in the arrow direction using the normal screwdriver to
see if the pressure roller moves parallel. If the balance is not good,

bend the pressure spring retainers on the bottom plate in the arrow
directions (e) to adjust the balance.

Pressure roller

e spring retainers

Bend retainers in arrow directions to adjust spring balance.

10-3-12. Disassembly/reassembly of RP sensor SA

Tools

Phillips screwdriver

1

I

[Disassembly prooedure]

1.Remve the holding screw (5-16).

2. Disengage the cord from the cord holder pawl.

3. Unsolder the cord from the connector PCB SA (5-2) using the
soldering pencil.

@

-28-

ER-04RP

[Reassembly procedure]

Reverse the disassembly procedure.
However, the following adjustments are necessary.

ADJUSTMENT 1

Adjustment of bi-directional printing misalignment

<Procedure>

Move the RP sensor SA to the right or left to adjust so that no
misalignment occurs in bi-directional printing.

H H H H------H —
H H H H------H ~

cMethod of adjustment>

Make the adjustment in accordance with the following table.

Phenomenon

H H H-----H —

H H-----H —

~

I

H H H-----H —

H H H-----H —

IADJUSTMENT 21

RP/HP waveform adjustment
<Procedure>

Measure the relationship between the RP waveform and the HP
waveform on the oscilloscope when bi-directional printing is made.

RP

HP

OFF

I

Method of adjustment

Move the sensor SA to the right
(toward the drive gear).

Move the sensor SA to the left

(toward the home position).

ON

r

. .

[Disassembly procedure]

1.Unsolder the red and black motor leads from the connector PWB

SA (5-2) using the soldering pencil.

2. Remove two holding screws (5-10).

3. Remove the connector PCB SA (5-2).

[Reassembly procedure]

Reverse the disassembly procedure.

However, the following adjustments are necessary.

BEFORE OPERATIONS

Replacement of diode (for printing speed adjustment) on PWB
<Procedure>

Make sure to replace the diode with a new one when the PWB is

replaced.
NOTE 1: If this procedure is not observed, it may not be possible

to satisfy the specification with regard to the printing
speed.

NOTE 2: Observe the polarity of the diode.

I

ADJUSTMENT 1

Adjustment of bi-directional printing misalignment

cProcedure>

Move the connector PWB SA back and forth to adjust so that no
misalignment occurs in bi-directional printing.

H H H H------H
H H H H------H

<Method of adjustment>

Phenomenon

OFF

I

H H H-----H —

H H H-----H —

Move the PWB SA forward
(toward the platen).

--

Method of adjustment

DP

<Check points>

RP waveform —
HP waveform —
GND

<Method of adjustment

Make the adjustment in accordance with the following table.

Value of A

1

5ms and lower

5- 8ms

8ms and over

I

<Checb

After the adjustment, check to ensure that no misalignment occurs
in bi-directional printing.

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

1[

Pin @of connector CNB
Pin @of connector CNB

— Pin@ of connector CNB

Move the sensor SA to the left (toward the
home position).

No adjustment necessary
Move the sensor SA to the right (toward the

drive aear).

%

Method of adjustment

10-3-13. Disassembly/reassembly of connector

PWB SA

Tools
Phillips screwdriver
Soldering pencil

H H H-----H —

H H H-----H —

Move the PWB SA rearward
(away from the platen).

\

ADJUSTMENT 2

RP/HPwaveform adjustment
cProcedure>

Measure the relationship between the RP waveform and the HP
waveform on the oscilloscope when bi-directional printing is made.

I

RP

HP

OFF

I

DP

cCheck points>

RP waveform
HP waveform — Pin @ of connector CNB
GND — Pin@ of connector CNB

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

1[

— Pin@ of connector CNB

ON

-

OFF

-

}1

bT

%

-29-

ER-04RP

cMethod of adjustment>

Value of A

5ms and lower

5- 8ms

8ms and over

I

Method of adjustment

Move the PCB SA forward (toward the
Dlaten).

,

r

No adjustment necessary
Move the PCB SA rearward (away from the

nlaten).

cMethod of adjustments

Adjust the diode (for printing speed adjustment) on the connector

PCB SA so that the cycle A comes within the range shown in the

table below.

Model

DP-61O
DP-612

Value of A

500ms - 555ms
602ms - 634ms

Method of adjustment

Value of A is smaller than the
specified range: Use diode of greater

capacity.

<Check 1> After the adjustment, check to ensure that no misalign­cCheck 2> Check to ensure that the flat cable is not in contact with

ment occurs in bidirectional printing.

the HP and DP disks when the printhead SA is moved to
the extreme right end.

10-3-14. Disassembly/reassembly of motor BK

Tools
Normal screwdriver (small size)

IDisassembly/reassembly flow]

CC

coil SA (Section 10-3-1)

Reassembly

I

Ribbon plate BK (Section 10-3-2)

I

Disassembly

J

Motor BK

I

[Disassembly procedure]

1. Remove two holding screws (4-2).

2. Remove the motor BK (4-l).

[Reassembly procedure]

Reverse the disassembly procedure.
NOTE: Use screw lock paint to fix the motor pinion in place.

However, the following adjustment is necessary.

DP-614
DP-617

649ms - 794ms Value of A is greater than the
844ms - 925ms

specified range: Use diode of smaller
capac~.

10-3-15. Disassembly/reassembly of ribbon feed

block

IDisassembly/reassembly flow]

-

I Ribbon plate BK (Section 10-3-2)

Disassembly

I I

4

Ribbon feed block

Reassembly

I

[Disassembly procedure]

1.Extractthe ribbon drive pole SA (4-24) upward.

2. Extract the ribbon drive gear (4-23).

[Reassembly procedure]

Reverse the disassembly procedure.

10-3-16. Disassembly/reassembly of timing belt SA

ADJUSTMENT

Printing speed adjustment

cProcedures

Measure the cycle A of the RP waveform on the oscilloscope

when bi-directional printing is made.

RP

1-

<Check points>

RP waveform —
GND

Make the adjustment under the following conditions.
Ribbon cassette:
Paper:
Motor driving voltage:
Ambient temperature:
Continuous printing

Pin @of connector CNB

— Pin@ of connector CNB

Loaded
Loaded
+24Vfl
Room temperature

Tools
Phillips screwdriver
Normal screwdriver (small size)
Tweezers
Tension gauge
Scale

IDisassembly/reassembly flow]

Printhead (Section 10-3-3)

I 1

Carrier block (Section 10-3-8)

Timing belt SA

-30-

Reassembly

II

ER-04RP

[Disassembly procedure]

Remove the E-ring (4-22).

1.

2.

Remove one or two adjust washers (4-21).

3.

Remove the pulley drive gear (4-20).

4.

Remove the two pulley flanges (3-7) by spreading them outwardly.
Remove the timing belt SA (3-4), idle pulley (3-6), drive pulley

5.
(3-9), ribbon slip gear (3-10), and ribbon slip spring (3-11).

Remove the ribbon reduction gear (4-19).

6.
Remove the screw (3-8) (M3x4) holding idle pulley plate BK.

7.
Remove the idle pulley plate BK (3-5).

8.

[Reassembly procedure]

Reverse the disassembly procedure.

NOTE 1:

NOTE 2:

Installation of idle pulley BK
Temporarily fix the idle pulley BK with the holding screw
(M3x4) after ensuring that the projection on the frame SA is
fitted into the hole of the idle pulley BK.

Installation of timing belt SA

As shown in the figure below, position the idle pulley and

the drive pulley with their cut portions facing outward, and
install the pipe of the timing belt SA by fitting it onto the cut
portion. The pipe must be installed with its longer podion
pointing up.
After installation, rotate the timing belt in one turn to
that the belt moves smoothly.

IADJUSTMENT]

● Adjustment of timing belt tension

With the pipe of the timing belt SA fitted onto the cut portion (see
the figure below), apply load to the center of the timing belt.
Adjust the belt tension by moving the idle pulley BK so that the

portion of the belt on which the diaf tension gauge is pressed sags
lmm when a pushing force of 40g is applied.
After the adjustment, tighten the holding screw tightly.

Dial tension gauge

ensure

Scale

Idle pul

Holding

screw

Hole (fu~rum)

I

idle pulley BK

Pipe

/

Drive
pulley

10-4. Lubrication
10-4-1. Lubrication time

Since the printer is maintenance free, lubrication is not necessary in
usual use of the printer. However, lubrication is necessary at the time
of disassembly, reassembly, and cleaning of the printer.

10-2-2. Kinds of oil

(1) Multemp PS.NO.1
(2) Floil 946P
(3) Epinoc Grease AP

.. .... .. . Maker: Kyodo Yushi

... ...... Maker: Kanto Kasei

... ...... Nippon Oil

l&4-3. Oil quantity

Large quantity ... ... ...

Adequate quantity ...... ...

Small quantity

Generous amount
Approx. 3 to 4 drops. Approx. 0.2mm

thickness in the case of grease.

... ... ...

Approx. 1 drop. Approx. O.lmm thick-

ness in the ti$e of grease.

10-4-4. Lubricating spots

Refer to the attached drawing and the lubrication table on the follow­ing page.

-31-

ER-04RP

10-4-5. Lubrication table ... Also refer to the

attached drawing for D type.

Arrow

number

1 4-16 Mounting pivot

4-8, 4-15 Mounting pivot

2

4-10,4 -11,4-12,6-3 Mounting pivot

3
4 4-5, 4-6,4-7, 4-26 Mounting pivot

4-4, 4-25 Mounting pivot

5

4-20 Mounting pivot

6

4-19 Mounting pivot

7

4-23, 4-24 Mounting pivot Multemp Adequate

8

4-26 Cam on reverse side

9

10

4-10,4-12,4-13 Joint (3 locations)
4-11 Circumference Multemp Adequate

11

4-5, 4-6,4-7 Joint (3 locations) I Multemp I Large I At replacement

12

I

13

1

1

I

I 20 \ 6-1 Slidinq portion (4

I 3-12 Surface

14 3-3. Entire face

15

3-4 Carriage drive pipe surface
16 4-23 inside (ratchet) Multemp Adequate I At replacement
17 3-9, 3-10,3-11 Joint (3 locations) Muttemp Large I At replacement
18 I 3-6, 3-7 Mounting pivot I Multemp
19

I 2-5 Bearing mount and PF ratchet (3 locations) I Multemp I Adequate At replacement

Lubricating spot

locations)

Kinds of oil
Multemp

Multemp
Multemp
Multemp
Multemp Adequate At replacement
Multemp
Multemp Adequate

Multemp Adequate
Epinoc

I Multemp I Adequate I At replacement

Floil 946P

Multemp

IMultem~ I Adeauate ! At re~lacement I

Oil quantity

Adequate
Adequate
Adequate At replacement
Adequate

Adequate

Large

Large

Small

I Adequate I At replacement

Lubrication time

At replacement
At replacement

At replacement

At replacement
At replacement

\ At replacement

At replacement
At replacement
At replacement

At replacement
and cleaning

At replacement

Notes

Do not apply to timing belt.

-32-

ER-04RP

-33-

‘.

\

\

\y

In

. .

.... ......-.”

. . . . . . . . --- . -- —

ER-04RP

11. Test function (SWI-7: ON)

To execute the test function, first turn power off, set the switch SW1-7
to ON, and then turn power on. The operation initiates the execution

of the test as set by SW1-2, SWI -3, and SW1-4.

11-1. ROM/RAM test (SW1-2:ON, SWI-3:ON,

SW-I -4:ON)

A sum check of the ROM and a read-after-write test on a particular

area of the RAM are performed.
The RAM is tested with respect to the comman~data buffer area.
80H bit shift pattern is used as the write data.

(8oH + 40H + 20H ...... OIH + 80H)

After the test is mmpleted, the following printout is produc~.
The sum data and the version of the ROM are printed out.

12345678901234567890 1234

~ ROM T EST O K 2418 V ER. 1 .0

~ RAM TEST OK (3 2KB)

~ (Paper feed)

12345678901234567890 1234

ROM TEST NG FF E3 V ER. 1 .0

RAM TEST NG ( 8KB)

! (Paper feed)
The RAM size varies according to the destination.

The RAM size is checked upon power-on to automatically set 8KB or
32KB whichever used.
The RAM size type is printed starting on the 13th column on the RAM
test result print line.

After the printing is completed, the buffer area is initialized.
For the RAM verify test, 64 bytes of object codes on the ROM is
transferred to a particular area on the RAM.

11-2. Host terminal emulation mode (SWI-2:OFF,

SWI-3:ON, SW1-4:ON)

The SW3 status is read, and with the read value as the receiving

station address, a printout commantidata packet is created and

transferred to the remote station. At this time, the transmitting station

address remains as previously set.

123456789012345678901 234

SRN TEST FROM 1 BH TO 2CH

Printout on receiving station printer by printout packet from transmit-

ting station

12345678901234567890 12345678901234 Black
SRN S E ND T E S T F ROM 1 B H T O 2 C H 0001 printing

I

Printout on transmitting
station printer (black
printing)

One packet is carried on one line, and a flag is set on the final packet.
If a transmit error status is returned from the SRN interface, the data
will be re-transmitted. If the transmission failed at the third try, the
status returned from the SRN interface will be printed out to terminate
the test.

12345678901234567890123456789012

SRN STATUS 10010000

status

When ACK or NAK is returned, the following printout is produced.

12345678901 2345
RSI

(RS1 is the 2Bth byte of status information, and RS2 the 29th byte)

When the above printout is produced, the counter is incremented and
the next packet is transmitted. The interval bemeen packets is about

3 seconds.

=Ooti

RS2 = 9 9 HI Blackprinting

COMMA N D 11 H ‘lack

Identificationcodeof
commandthatcaused
error

printing

11-3.RAMverify (SWI-2:ON, SWI-3:OFF, SW1-4:ON)

At the end of 7-1. ROM/RAM test, the copy data in the verify area is
compared with the original ROM data, and the result is printed out.

12345678901 23
RAM

12345678901 23

IR A M VERIFY

11-4.

VERIFY O K Blackprinting

Or

O KI Blackprinting

Dip switch read test (SW1-2:OFF, SW1-3:OFF,
SW1- 4:ON)

The switch values are read and printed out.

12345678901234567890123456789012 345

1

2 345678
SW I ON ON ON ON
SW2 ON ON ON ON o N ON ON o N
SW3 O F F OF F O F F O F F 0 F F ON O N ON

O F F ON ON ON

11-5. Printout test (SW1-2:ON, SWI-3:ON,

SW1”4:OFF)

All internal character codes are printed in a black matrix pattern one
at a time. After that, a pattial cut is performed, and the same contents
as the first ones are printed out in red.
The above cycle of operation is repeated endlessly.
The program can be terminated only by turning power off.

k

Transmittingstationaddress

I

11-6. SRN flag continuous transmission

(SW1-2:OFF,SW1- 3:ON, SW1-4:OFF)

SRN interface is reset, and the flag pattern continuous transmis-

The

sion diagnostic (diagnostic 3) is carried out. NO printout operation is

performed in this test.

The program can be terminated only by turning power off.

11-7. SRN packet continuous transmission

(SW1-2:ON, SW1-3:OFF, SW1-4:OFF)

The SRN interface is reset, and the packet continuous transmission

diagnostic (diagnostic 4) is carried out. No printout operation is per­formed in this test.
The program can be terminated only by turning power off.

-34-

,.W,.,..,

....

Line inspection program (SW1-2:OFF,

11-8.

SWI-3:OFF, SW1-4:OFF)

The diagnostic programs of the printer are sequentially performed to
test the hardware functions.

(Testsequence)

(1) Printout test
(2) Dip switch read test
(3) ROM/RAM test
(4) Host terminal emulation mode

The line inspection program can be terminated by turning power off.

Host terminal emulation mode (4) is continuously performed until the
power is turned off.

12. Special service tool

12-1. Disassembly of the control PWB and the

SRN interface PWB

Remove the rear cover.

1)

Disconnect all the connectors. (7 positions)

2)
Remove the four fixing screws of the PWB and one fixing screw of

3)
the connector cover. Then the PWB’Scan be removed.

ER-04RP

Insert the connectors (which were disconnected in procedure 1))

5)

r

to the UKOG-6669RCZZ.

$

4) Attach the UKOG-6669RCZi! to the ER-04RP body so that it
comes in the position of the printer control PWB. Use the screw
removed in procedure 1) for fixing.

w

?

I

?

7

I

-35-

ER-04RP

~...------l

12-2. ER-03RP Service Tools

o

connection

PE saneor

Auto

cutter

Printer
control

SRN

z

o
z

z: ~

CNS

o

CN2

10PIN

I

10PIN ,

._ . ...-----4

1

I

0?. *

u

o ~

-

c

r

-36-

ER+4RP

x

—

c

w

— I

b

b

m
x

,
!

0
K

a

0

m

I

c

ZN2

L

?NJ

—

[

CNY

L

m

m

v

m

I

nJ

I

+

-37-

ER--O4RP

m

I

U-J

I

v

I

m

I

-.

1

r.

u

:\l

,

I

[

I

1!!

Ill’:

W

J

0

r

1-

—

J

I

r’.
x

I

~

X- WCO-L9ZS

~D5N31 3d

I

r
.
.

c

QN3

a
:

k

1

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I I

[d& ) k -b6C--3ZS

H51Nbm23h b3-t’.

m

I

m

I

T

I

T

$d l~hbd ND ! 1Ub3do

?,.~

:dL:x-uio-.9zs

.

lhj

\

-38-

ER-04RP

A-U90-19ZS

tNd-Ii?S-3dOl-sd

>N3

1

u

I ,
1 1

I r

tNd-Ilt5-~doI-sd

SN2

1

I

a3RoJ

9N)

1

I

—

I

I I

o

IA

6
Y

c

-

I

W

m

0

I

—

-i

l—

—

m

...-

. .

I

D

,

—

.

-39-

a

ER-04RP

u)

I

L

0

“

a

Ln

I

I

1

1 1

L

1 1 I

-1

m

—

z
a

h

(

u

K)

I

m

I

T

I

m

I

nJ

I*

-40-

ER44RP

!.. ,

-----

I

,

x

—

u

—

L

r

,Z

Zz

Ulul

,!

-­“.

IA

! 1!\ ! !

1

I

I 1

I I nfl

)1

c

t

t

III*

m
.

)

I !1

111111

1 ! ! I 1 1

1 1 ,, I I

Ill

I

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—

I

I

II

{

-- A----

..”..

.-

A

,r

n

,“ --”

-41-

.,.,.............“

1

.—

u

—

----- -- “.

ER-04RP

. ..-. .——-

u-l

k

—

IA

AOT/f1001

a

gl

L

c

k?

L

lx

a

-42-

I

.....”””.......- .——— - “-

“-“

14. Installation procedure of inline cable

The ER-04RP is provided with the BNC-T mnnector and the ferrite

core as accessories. install the cable as follows:

1) Coonect branch cable @ to BNC-T connector @, and connect
terminal resistor @ to the terminal of the ER-04RP.

2) Install ferrite core @ to branch cable @ and fix it with accessov

band 6.

15.

Installation procedure of ER-04RP for
Mounting on a wall

No.

1

2
3
4
5

6
7 OCZ71 F 4717 6// AD
8
9

1) Open the cover

PARTSCODE

OCZ71 3SEC01 13

OCZ71 3SEC01 14

OCZ71 SEC- 1840

OCZ71 SEC- 1843 AP
OCZ71 SEC- 1844 AL
OCZ71 SEC- 1845 BD

OCZ71 G22 96 7/1

OCZ71 G59 378 i/ AD

a) Lift the paper cover@ in the direction of arrow @.
b) Lift the ribbon cover@ in the direction of arrow@.

PRICE

RANK

BD

BA

DESCRIPTION Q’W

Printer cover
Bottom base
Operation sheet

AL

Wall fitting angle A
Wall fitting angle B 2

Cable angle

Holder
Screw (M3 x 6)

AD

Screw (M3 x 8)

ER-04RP

J

1
1
1

1

1
1

2

1

Fig. 1

Note: The ferrite core is for EMI margin up. Use it when the ER-

04RP serves as the terminal of an ECR.

3) Connect the BNC-T connector to BNC connector @ of the ER­04RP.

T

i

ECR

Fig. 2

Fig.1

-43-

ER-04RP

Remove the four screws @ suited on the back cover@.

2)
Remove the back cover @.

3)
Remove the screw @ and connector cover@.

4)

Remove the connector guide @ and SRN connector cable @ in

5)
the direction of arrow ~.

SRN connector cable @ is rather long, pull out the cable when
removing.

Loosen the fixing nut of SRN connector cable @, and remove it

6)

from connector angle @.

Return connector guide @ to the original position.

7)
Pass the SRN connector cable @ through bottom base@.

8)
Hang the bottom base @ to the ER-04Rp in the direction of

9)
arrow D.

Fix the bottom base @ to the connector guide @ with the screw

10)

@.
Fix the SRN connector cable @ to cable angle @ with a fixing

11)
nut.

Fix the cable angle @ to the connector guide @ with two

12)

screws.

~~ Screw(M3 x 6)

Fig.2

Fig. 3

-44-

Connectthe SRN cable@.

13)
Connect the AC cord.

14)
Attach the holder @ to the AC cord @.

15)

Fix the holder @ to the cable angle@ with a screw @.

16)
Remove the four screws @ suited the back cover@.

17)
Fix the two wall fitting angle B @ to the back cover@ with four

18)
screws @.

Replace the back cover @ to the ER-04RP withfourscrews@.

19)

-4

P

Attach thewallfittingangleA@ to the wall.

22)

● Tghten the six screwsto fixthewallfittingangleA.

The six screws are not included in the wall fittingkit, use

mmmerciallyavailableones whichhave enoughstrengthand
are modeofsuitablematerial.

* When selecting the place of installing the printer unit, con-

sider well its weight,how much it vibrates during operation,
and the environmentalconditionssuch as ambient tempera­tureand humidity.
And the place is the ER-04RP don’t drop out of wall when

personlean againsta wall.

23) Hang the ER-04RP on the wall fitting angle A@.

L

Fig. 4

Remove the operation panel @ and take off the adhesive on the

20)

upper cover @.

21)

Replace the wall fittingoperationpanel@ and attachthe printer

cover@ to

ER-04RP.

P

<v

20 Operation panel

@ Printer

/

cover

17

Fig.6

Fig. 5

-45-

SHARP

COPYRIGHT ~ 1995 BY SHARP

All rights reserved.

Printed in Japan.

No

part of this publication may be

in a retrieval system, ortransmitted,

stored

in any form or by any means,

electronic, mechanical,photocopying, recording, or otherwise,

without priorwritten permissionof the publisher.

CORPORATION

reproduced,

SHARP CORPORATION

Information SystemsGroup
Quality & Reliability Control Center
Yamatokoriyama,

1995 May Printed in Japan @

Nara 639-11, Japan