Sharp ER-04RP User manual

SHARP SERVICEMANUAL
CODE: OOZER04RPSM-E
RemotePrinter
MODEL ER-04Rp
OPTION FOR IN LINE SYSTEM
1.
2.
3.
4
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
General .........................
Specifications....................
Settingof Dipswitches . . . . . . . . . . . . .
Disassemblyprocedure . . . . . . . . . . . .
circuitdescription.................
Printerunitdescription . . . . . . . . . . ●. .
Autocutterunit ...................
Overviewand operatingprincipleofthe
Troubleshooting..................
Disassemblyand reassembly. . . . . . . .
Test Function(SWI-7: ON) .........
Specialservice
Circuitdiagram
tool. . . . . . . . . ●*● ● .●~
1
. . . . . . . . . . . . . . . . . . . . . . . . . . .
1
...........................
... ... ... .O*. .**~=*. *.. Q... 2
... .*. ..** ... .**. ... *.~*. ~~
3
... ... .. O........**.**.**** 5
... ... ... ... .*. .*. .*** 0*~*~ 9
,.. ... ... *Q. ... ... *.** ..Q. 10
printer . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . 18
..........................22
●... ... ... m~o.... **** .....34
..........................35
37
....*......*...*...*..*..*.**..*....*””””””””
Installation
Installation
procedureof
procedureof
in-linecable . . . . . . . . . . . . . . . . . . . . . . . . . . ..43
ER-04RP for moungingon awall ...........43
This document has been published to be used
SHARP CORPORATION ‘“rafiersa’esse’’’ice”y’y-
The contents are subject to change without hotice.

.—.l.— ——”-..”-.——————————
1. General 13) Outlook
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 cut-
ter feature.
The ER-04RP is available as ades~op or can be mounted on a wall.
System diagram
\\ SRN(lMbps) 5$
--r Y+
ECR ER-04RP ECR ERU4RP ER-04RP
1) The maximum number of option units depends on the system’s
application program.
2) The total cable distance should not exceed lkm.
2. Specification
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
External interface
SRN interface ... one host, nunits of printers
Control method
Controlled by the command from the host (ECR, POS)
Printer
Model: DP-614 serial dot printer
Printing area: 36 columns/line (normal mode)
18 coloumns/line (enlarge mode)
Font: 8x8dot matrix
Print color: Black/red (two colors)
Print speed: 3.0 Iines/second
Linefeed: 18 lines/seconds (fast mode)
Kinds of printing character sizes
Normal, Double size
Auto paper cutter
Print data protection
Backed up by capacitor.
Installation
Desktop or mounted on a wall
Cabinet
Moisture tight
Print paper
Kind: Plain paper
Size: 76.0 k0.5mm, paper roll diameter 83mm
Thickness: 0.07-0.09
Weight: 52- 64g/m2
Ink ribbon cassette
Color: Two colors of black and red
Character set
ASCII conforming 7-bit/8-bit character
Operation mode
Self test
On-line (normal print mode)
Off-line (standby mode)
Print halt mode
Controlpanel
f \IPaperoutiet
I‘IA
POWER
ONLINE
ALARM
m
“n’’neswi’c’mk\ Ribbon /
cover
Paper
Connector
~b nm
0
In
cover
ACpowerreceptacle b.- 4
Powerswitch
Fig. 1-1
14) Size/Weight
176(W) x263(D) x125(H)mm (include to connector)
(6.9”(W) X10.4”(D) X4.9’’(H))
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(32-104”C)
300/0-90Y0
17) Reliability
Printer (except dot head): MCBF 2.5 million line
Dot head: 50 million characters
Ink ribbon: ApprcIx.2million characters
18) Descriptionof Each Block (Ref. Fig. l-l)
@AC cord assy Insert the connector into the AC inlet of
the printer and the plug into an AC out-
let.
@AC inlet An inlet for power input. Insert the con-
nector of the power cord assy into this
inlet.
@Power switch Set the switch ON to turn on power to
the printer.
@Online switch 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.
-1- @Line feed switch Press the switch to feed the paper (in

ER--04RP
3.
Line feed switch
POWER indicator
(yellow green)
ONLINE indicator
(yellow green)
ALARM indicator
(red)
@Connector
@Printer cover
@Ribbon cover
@Upper cover
@Bottom cover
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 on-
line switch or turn off and on the printer
power.
Used to connect the printer to the SRN
host via acable. 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.
Setting of Dip switches
Remove the bottom cover of the remote printer to access the three
8-position dip switches.
The following describes the dip switch functions.
3-1. SW1 (DS1)
Swl -1 Used to select CR code enable/disable.
ON: CR code enabled
OFF: CR code disabled
SW1-2,3,4 Used to select the diagnostic program type.
Swl -2 SW1-3 Swl -4 Function
ON ON ON ROWRAM test
OFF ON ON Host terminal emuiation mode
ON OFF ON RAM verify
OFF OFF ON Dip switch scan test
ON ON OFF Print test
OFF ON OFF SRN flag continuous transmission “1
ON OFF OFF SRN packet continuous transmission ●1
OFF OFF OFF Line inspection program
●1These 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.
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 SW1-6 Conversion type
OFF OFF Type 1
ON OFF Type 2
OFF ON No code conversion
ON ON No code conversion
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 ac-
cordance with the setting of SW1-2,3,4.
ON Diagnostic mode
OFF Normal operation mode
,Used to set the auto cutter YES/NO.
The ON status of the switch indicates that the auto
cutter is used.
ON IAuto cutter= used
OFF Auto cutter =Not used
3-2. SW2 (DS2)
SW2-1,2,3,4 Not used. All fixed to ON.
SW2-5 Used to select the SRN transmission speed.
IOFF \480 Kbr)s 1
I
ION 1Mbps 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.
SW2-6,7 Used to set the carrier off monitoring time.
4
SW2-6 SW2-7 Timer value
1Mbps 480 Kbps
OFF OFF 6.4mS 12.8mS
ON OFF 4.8mS 9.6mS
OFF ON 3.2mS 6.4mS
ON ON 1.6mS 3.2mS
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.
SW2-8 Not used. Fixed to OFF.
-2-

ER+4RP
3-3. SW3 (DS3) 4. Disassembly procedure
The dip switch is used to set the SRN terminal address.
In the normal operation mode (SW1-7 OFF), the switch is scanned 4-1. Removal of upper cover and bottom cover
immediately after the master reset has done, and is set in the SRN
controller. Master reset must therefore be done when the address 1)
setting is changed.
In the diagnostic mode, the address is set each time, immediately
before the execution of the SRN basic test. 2)
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 abinary number with the SW3-1 setting as
To remove the upper cover, remove the screws M3x6 (at four
locations) shown in the figure and unfasten the connector with the
upper cover lifted up.
Remove the screws M3x6 (at four locations) on both sides to
remove the bottom cover. 1~
the mst significant bit and the SW3-8 as the least significant bit.
3-4. Dip switches DS1-DS3 factory setup
SWITCH IFunction Default
,
[Swl -1 ICR code (disabled) OFF
!
H
SWI-2
1
OFF
Selection of diagnostic program (line ------------
Swl -3 OFF
inspection test) ------------
ISWI-4 IOFF
!
Swl -5 Selection of conversion type (type 1)OFF
------------
SW1-6 OFF
Swl -7 Diagnostic mode (prohibited) OFF
ISW1-8 \Auto cutter (Yes) ON
t
H
SW2-1
F
ON
SW2-2 Not used ON
SW2-3 Fixed to All “ON”. ON
SW2-4 ON
SW2-5 SRN transmission speed (1M bits) ON
SW2-6 ~Carrier off timer (6.4ms) OFF
------------
SW2-7 OFF
iSW2-8 INot used IOFF
H
SW3-1
t
OFF
------------
SW3-2 OFF
------------
ISW3-3 IIOFF
II~------------
ISW3-4 Terminal address (OOH) IOFF
------------
HLOFF
------------
ISW3-6 IIOFF
14P------------
ISW3-7 1IOFF
iI~------------
ISW3-8 OFF
/
/
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.
Printer mechanism
Fig. 4-2
-3-

-.........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-
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. (Twospacers will come off at the same time.)
nector cover holding screw (at one place) to remove the PWBS. Auto cutter unit
Control
SRN interface PWB
?
PWB
e’
pacer
ter mechanism
Fig. 4-5
Fig. 4-3
4-4. Removing the power supply
power supply unit
1)Removing the power supply PWB
PWB and AC
●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.
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 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
Power transformer
Noise filter PWB I
/.
Fig. 4-6
47.
When fixing with the switch panel interface connector PWB removed,
use fixing screw of 3x8. If the any other screw is used, it makes
contact with the power PWB.
●Remove the printer mechanism and the screw (at one place) to
remove the PE sensor PWB and PE sensor holder as an assemb-
ly.
To remove the PWB alone, twist the PE sensor holder lug and
detach the PWB from the holder.
Lug
/
+
+
.\.
<’ \/
Fig. 4-4
-4-

.....,.—w. ...m.”—— —.—.. .—.—-.—-.... —.— ..-..——
5. Circuit description
5-1. General
The ER-04RP is aremote printer using the SRN
work) as an external interface through which
electronic cash register and a POS tefiinal.
(Sharp Retail Net-
connected to an
The remote printe; has acontrol circuit that consists mainly of aCPU,
aROM, aRAM, 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 aprinter
mechanism, and a power supply circuit for supplying necessaw
power to each circuit.
Fig.5-l shows ablock diagram of the remote printer.
[=1 osc7.37m
r-iOh
panel IImmm
AC115V
AC~V
I1I
‘1—’1 VRAM
Laupercapacitor
ALno 4
culter
>\
5-2. SRN control circuit
1) UOallocation and memory mapping
TheCPU used in the SRN control circuit is asingle 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 aROM, aRAM, and
external expansion 1/0s peripherally arranged as shown in the at-
tached page.
The RAM has acapacity 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 acapacity of 256K bits and contains control software
and CG data for character printouts.
2) CPU peripheral circuitry
The M50734SP CPU is aCPU with an external memory, and reads
the 8low-order bits of the address through the AO/DObus lines from
an 8-bit latch HC373.
The ROM has acapacity of 256K bits, and the RAM 64K bits or 256K
bits. Asuper 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.
Aceramic oscillator is used as the CPU clock to provide aclock
frequency of 7.37MH2.
Fig,5-1 ER-03RP block diagram
“< 0. ,
( I -6H) ;< “: ‘> )\
CI-5HI >
)\ \
I$)
I
IROM I
I I
272S6/S12
(It50CKf T1II IIll
[1-4HI gI!1
(1-4*) ,1!—
I
Fig.5-2 ROM/RAM circuits
-5-

ER--O4RP
3) Connectionwith 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 \
wlap Ra 10Pw
-
Wu
DATA
Itvour ~(liuq
-m(sdq Printer con-
fflc -m (P-11)
*
(l MbPs) ND(CS) w10P --ruuurlRIJ *lop U&
b
Am
ml *Ael
I6P Ifi
bwr
I+W (~)
+24V(0.M)
+12V(150rnA)
Fig.5-3 SRN interfacelprinter controller signal diagram
Interface sianal descrit)tion
1.
2.
3.
4.
5.
6.
7.
S~R
The SRN interface is reset with alow state of signal. The CPU
resets the SRN interface any time through the printer controller
P03 port.
RESET
Reset signal.
This signal is at ahigh during the power ready state (when
+5V*5% is secured) and low otherwise.
——
RD, WR
Signals for data read/write between the SRN interface and the
controller.
SRNS
SRN interface select signal
DO-D7
Data bus
TRRQ
interrupt request signal from the SRN interface to the controller
Power supply
+5V :Logic drive power +5Vti”/0, 250mA
+12V: SRN line bias circuit power 12V~l Y0,150mA
‘RNS ~i
Aao,l
m+max120ns T
Readdata
imin50rts
Writedata
4) Initial reset and power down interrupt circuit
IC3 is for generating apower down interrupt and a reset signal. When
the supply voltage drops due to apower 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 apower 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 com-
pleted 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
ahardware 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 apower
down reset is caused, thus providing attiple fail-safe mechanism.
[1-4H1 v; 1
,
[1.
().
Fig.5-5 Reset and power down interrupt circuit
Voc(5V) t~
Abaut4.6V II
m7
Povverdown
interrupt
P37 J
RESHOW
+
WD I
Fig.5-6 Timing chart
MB62H149AC gate &ray timing
Fig.5-4 SRN intedace data write/read timings -6-

ER44RP
5) Printer control circuit
When alow state of signal through the port P31 of the CPU, the
motor starts to run with timing pulses appearing on the DP line of
CN5.
After the motor started, printing takes place in synchronism with
the timing that the Pport P34 turns from high to low.
Of nine CPU output ports P20-P29 and P30, alow state of pulse
is sent at selected PORS,and a character is printed with one
energization of the DOT solenoid against two timing pulses.
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
1)
2)
3)
4)
5) low at aprescribed timing. CPU
1C5
TFII 1OK-9
2gRRS :: ~:;
CN3
CN3 -6 3~R9S
cn3 4~ RR; 1s P22
CN3 -7 SgRF15 16, P23
6V RRS 17 P24
7
CN3 -4 QRQS 10 P2S
e~RR6 19, P26
CN3 -5 08 i8.10 9V RQS 20, ?27
CN3 -3 #23 {09 )9 20 102 RQS
-- 1
1
CN3 -1
CU3 -e
CM; -9
CN3 -Id
CM3 -1s
P30
P31
P32
?33
p~,
P?s
p~s F
9134
a14 4
Flls 4
CN3 -2 m,~
‘XIN
F28 Xoul
I1,, ,3, ,
0H14Z
%-%
VREr
z●
SYNC E
40
Vcc
M: B- 12-15
(2- 19)
[
CN2 -1
CN2 -2
,“” Im
m
(CNTR)P02
P03
P04
Po!i
P06
P07
V55
J
74HC: 4
IC12
3~ Ra4 ,1
?4HCI 4
1OK-8 I
H
2Ral
3RR I
4RR! 7
SRQI
6RR1
7RP! ‘
ERR1
9Rnl
Plo
PI:
PI?
?13
P14
Pls
PI 6
P1’
1
CN2 -4
[N? -6
CN2 -9
[1
Fig.5-7 Printer control circuit
6) Paper end sensor circuit
Fig.5-8 shows the paper end sensor circuit. Areflection type
photointermpter is used as the sensor. When the paper is present,
the light reflected from the paper strikes the phototransistor, there-
fore, the collector of the phototransistor is at alow. On the other CPU
’40
hand, when the paper runs out, since no light is reflected, the collec-
tor is at ahigh, which causes the input port P40 of the CPU to go
high, thus informing the paper end state.
--—-—-—-
1I1
-—-—-—-—- 1I.
Fig.5-8 Paper end sensor circuit
-7-

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.
-- —._
--—-—-—-—-—-—- —. —-—-—-—
1
IIVcc
I
Ib
ILA11i
I
I
I
t
SwI— ON-LINE I
r“
.
T
P42
t-
+SW ~FEED A1P43
~Ab‘
T T
L- —-—-—-—-—-—-- ;
L.–._._.–-–.–.–
Fig.5-9 Operation panel circuit
8) Cutter control
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 Yare controlled as shown in the table below to rotate the motor
forward or backward.
Forward Reverse stop stop
xHLLH
YLHLH
Fig. 2-8 shows the timing chart. On falling of Sin 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.
2oms
Fig 2-8. Time chart
CPU
–-~—-- ““+
_–l–
“- +
II I ,.. 1
OwY
5-3. SRN interface circuit
1)Circuit description
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
acoaxial cable. (RG-58U)
*f
~y-
CPU
Z-80 DMA
BUS
IF
ROM ADLC
RAM link MOD.
controller A
Printer controller T
qlq
Driver Receiver
I
1
1Mbps
DATA
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.
IMHz P-P 5V Ou@ut impedance
5V a
Check on oscilloscope
Ov b
‘0.w sTo.5p Sq
+
Fig.
2, Connect adummy network to the printer.
Connect the oscillator and the oscilloscope as shown below.
5-11
Fig. 2-9. Cutter control circuit
-8-
Fig. 5-12

ER-04RP
3. Adjust the VR1 5~ potentiometer to obtain the fOi10win9
waveform.
wT1 :580nsec-620nsec
0.61Js0.41.Is T2: 380nsec-420nsec
Fig. 5-13
4. Power supply circuit
1)
2)
Power supply circuit (secondary side)
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 aregulator IC of low saturation voltage type which sup-
plies stabilized +5V power to the circuits.
The 24V power is stabilized by IC2 with the current boosted by
transistor Q1.
The +12V power is created from the 24V power using IC3.
The fuse is T1A250V, and protects the 5V power from overcur-
rent.
Noise filter circuit (primary side)
The noise filter circuit uses acommon mode type filter to
eliminate noise generated from the AC power supply as well as
radiation noise from the printer and thus assure stable opera-
tion of the printer.
........
N4T-N
“1~c3222
ACIN cl —; \ C2 hACOUT
IMT ; : T104 C4 ,
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
(1)
(2)
(3)
(4)
Do not operate the printer when the printer is not loaded with
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.
Do not try to move the print head by hand. Since the belt that
drives the print head is directly coupled with agear 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.
Since the printer uses apermanent magnet (in the motor) and
an electromagnet, avoid using the printer in alocation that may
be subjected to alarge amount of iron filings, dust, dirt, etc.
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 alocation where alarge amount of
dust or dirt, high temperature, or high humidity is encountered.
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.
ox
rlr
6-2-2. How to loadthe roll paper
Load the paper as shown below.
Correct
o
Incorect
x
-—
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.
(1)
(2)
(3)
Pull out the paper upward. (For friction type only)
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 apaper feed knob, pull the knob to
release the shaft, and rotate the shaft to eject the paper. (In this
case, the paper can be ejected in either direction)
Eject the paper by electrically operating the printer (pressing the
paper feed button with the power ON).
6-3. Hints in using the ribbon cartridge
Use the ribbon cartridge of prescribed specification. If anon-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
(1)
(2)
(3)
Tghten the ink ribbon by rotating the ribbon cartridge knob
clockwise (arrow direction).
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
cartridae knob once again in the clockwise direction (arrow
directi~n) to remove the slackness in the ribbon.
6-3-2. How to remove the ribbon cartridge
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)
(2)
7.
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 avacuum cleaner).
Thoroughly clean eve-y part of the printer by vacuuming dust
and dirt.
Use alcohol or benzine to wipe off dirt.
trichiene, or ketone detergents as these
damage the plastic parts.
Auto cutter unit
7-1. Maintenance and handling
7-1-1. Note for handling
(1)Note or use
Never use thinner,
may deteriorate or
Do not use this unit to cut paper other than the specified record-
ing 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 avacuum 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 Maltemp Brush
Lock lever shaft Maltemp Brush
Crank pin Mo grease Brush
Movable blade sliding section Mo grease Brush
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 acompact 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.
7-2-2. Mechanism and operating principle
(1)
(2)
(3)
Power transmission mechanism section
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 rota-
tion). (Fig. 1)
Detecting section
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 mov-
able 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 cut-
ting.
Fig.2 Cam
(+;
&)
/
Cutter gear Fig. 2
Fig.3
Movable blade mechanism
Rotating movement is converted into alinear movement by the
crank pin to drive the movable blade to cut recording paper.
“Crank pin
Fig. 4
In full cut, the crank pin turns one rotation to return to the
home position. The movable blade moves 12mm.
@Partiai cut
IYvAvAv~vAvAv/ I
Fig.5
Fig.5
In partial cut, the crank pin turns reversely to the home posi-
tion when the switch signal is received.
The movable blade moves 9mm.
-10-

ER-04RP
7-3. Repair
For troubleshooting, descriptions are made for the following items.
Troubleshoot according to the descriptions, locate the trouble posi-
tion, and repair it.
7-3-1. Phenomenon
Search this column to identify the trouble phenomenon.
7-3-2. State
Thesametrouble may have different states. Check this column.
7-3-3. Cause
me possible causes are listed in this column. Check this mlumn for
the cause.
7-3-4. Check position and procedure
Thiscolumn states how to inspect to identify the cause.
7-3-5. Repairprocedure
Repair the trouble according to the description in this column.
Phenomenon
1. The motor does
not rotate.
2. The recording
paper is not cut.
State
BThe 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
sThe 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 Repair procedure
Drocedure
●Check the input power. I* Ifthe voltage is outside
Use atester to check the specification, repair
across the motor. the power supply circuit.
●Apply the rated voltage ●If the motor doesn’t
across the motor and rotate, replace the
check if it rotates. motor with anew one.
●Remove the cutter cover “Remove foreign
and check the moving materials.
section.
●Use atester to check ●If it is abnormal, replace
the switch output. the switch.
I
●Check the thickness of ●Use the specified
recording paper. recording paper.
(Max. O.lmm)
sCheck the path of sRemove foreign
remrding paper. materials,
“Remove the cutter cover ●If the cover is deformed,
and check for replace it.
deformation.
●Remove the cutter cover ●Remove paper dust and
and check for dust. lubricate the section.
●Remove the movable ●If the blade is broken or
blade and check the worn down, replace it.
blade tip.
-11-

ER44RP
7-4. Disassembly and assembly
7-4-1. Disassembly procedure
Reverse the assembly procedure for disassembly.
7-4-2. Assembly procedure
Follow the assembly instructions shown below.
“Fig. No.” is the disassembly figure No.
Assembly Assembly part name Fig. No. Assembly procedure and note
procedure
1Cutter frame ass’y 1b
2Paper guide 2
3M2.6 X83,,
4%. Lock lever Rass’y 4
s% E3 6
6@ Lock lever Lass’y –5: ‘}
7* E3 6
Lock lever SP f
8* x2 7A
9‘Cutter gear ass’y 8
10 E2.5 x2 9
A
11 Motor ass’y 10
12 Worm ass’y 11
13 M2.6 X5x2 12
14 M2 X8(SW) x2 13 :T
15 Insulation lock tie 14 4
16 Cutter SP 15 A,
17 Guide plate 16
18 Movable blade 17 1‘l—-
A
19 Cutter cover ass’y 18
20 M2.6X8x2 3
21 E3 x2 6
Lubricate the lock lever shaft. (Maltemp)
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)
Lubricate the teeth of each gear. (Mo grease)
Lubricate the movable blade and the crank pin. (Mo grease)
Check that the guide plate and the movable blade are
securely engaged with the guide shaft and the crank pin,,
and attach the cutter cover.
Parts marked with ““x’ are not required for the AC-3.
-12-

/-12
,—14
I
/
.0,
\
/–17
7.9
/
I/-18
I
-13-

,..,,........... .
.....
ER+4RP
8. Overview and operating principle of the
printer
8-1.Overview
8-1-1. Features
The DP614 printer is acompact serial dot printer, and has the follow-
ing 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.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Printing method
Serial impact dot matrix printing method
Printing direction
Bi-directional (unidirectional for graphic printing)
Printing speed
3.0 lines/see. Al 070
(At motor voltage +25V, +25”C)
Print format
1) Character matrix 7x7 (including half dots)
2) Dot composition
180 (360) dots/line
Numbers in parentheses include half dots.
3) Print columns and character size
40 columns 1.4(W) x2.4(H)mm
Color change
Color change is accomplished by energizing the color change
solenoid.
1)Voltage: 24tl VDC
Resistance: 33A3Q (25tC)
Paper feed
1)Voltage: 24~~VDC (across solenoid terminals)
Resistance: 33*3Q (25”C)
2) Paper feed pitch 4.23mm (1/6”)
2.82mm (1/9”) for graphic type
3) Quick paper feed Approx. 18 lines/see.
Recording paper
1)
2)
3)
Type Friction type: Roll paper
76mmH.5mm (width)
@83mm(outer dia.)
Pin wheel type: Fan fold paper
Width 76mm (3”) to 89mm (3.5”)
Kinds of paper Plain paper and non-carbon paper
Recommended paper
(Cutforrn paper) 45-55kg/l 000 sheets(1091x788mm/sheet)
(Copy paper) Non-carbon paper
Friction type: One original +one copy
Pin wheel type: One original +two copies
Inking
Motor
Printhead
Total thickness 0.2mm max.
Special cartridge ribbon, re~black two-color or black
monocolor
DC brush motor
Voltage: 24~1VDC
Current: Peak current Approx. 1A
Average current 0.2A max.
Number of wires:9
Wire diameter: ().smm
Wire pitch: 0.353mm
Solenoid: Voltage 24*1 VDC
Resistance: 17Q (25”C)
11. Overall dimensions 137(W) x136(D) x63.5(H)mm
(5.4”(W) X5.35”(D) X2.5(H))
12. Weight Approx. 690g (1.5 Ibs)
13. Reliability Printhead life: 50 million characters
Printer mechanism: MCBF 2.5 million lines
14. Operating temperature oto +50”C
8-2. Mechanism and operating principle
8-2-1. Outline of mechanism
The printer mechanism consists of the following nine blocks.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Frame block
Motor block
Powertransmission mechanism block
Sensor mechanism block
Head feed mechanism block
Printhead mechanism block
Paper feed mechanism block
Ribbon mechanism block
Color change mechanism block
8-2-2. Mechanism and operating principle
Of the above nine blocks, seven mechanism blocks excluding the
frame and motor blocks are described next for their structures and
operating principles.
(1)Power transmission mechanism block
This mechanism block is disposed en bloc on the right side of
the printer unit, and consists of amotor pinion fixed to the motor
shaft, areduction gear, and a drive gear, plus four gear trains
coupled to the drive gear, i.e. a head feed gear train, apaper
feed gear train, aribbon feed gear train, and a ribbon reset gear
train.
Reduction gear gear
Head feed gear train
This gear train consists of apulley drive gear, which is driven
by the drive gear, adrive pulley, and an idle pulley. The drive
pulley drives atiming belt SA to feed the printhead.
Drive gear
rive gear
Idle pulley
-14-

@Paper feed gear train
This gear train mnsists of aPF slip gear, which is coupled by
friction to the drive gear, aPF drive gear BK, which is coupled
via aclutch to the drive gear, aclutch gear BK, aPF reduction
gear, and a PF shaft gear, to transmit power to the PF shaft.
Drive gear PF shaft gear
\PF drive gear BK / /
PF SI \PF ~eductiongear
Clutch gear BK
@Ribbon feed gear train
The gear train consists of aribbon slip gear, which is coupled
by friction to the drive pulley, aribbon reduction gear, and a
ribbon drive gear, and works to continuously take up the ribbon
as the motor rotates.
Drive pulley\n ~
Ribbon reduction gear
@Ribbon reset gear train
me gear train consists of areset 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.
Drive gear
(2)
Ribbon
/
Reset cam ‘drive gear
Sensor mechanism block
reset cam
The sensor mechanism block consists of three sensors, i.e. a
DP (dot pulse) sensor, aHP (home position) sensor, and an RP
(reset pulse) sensor, and plays an important role in the operation
and control of printer mechanism parts.
Carriage
RP sensor DP disk
BK
otor BK
nterrupter)
ER+4RP
@DP (dot pulse) sensor and HP (home position) sensor
The DP/HP sensor block consists of adot pulse disk directly
coupled to the motor shaft and having equispaced apart 20
slits, aDP disk integrally fomed with ahome position sensor
pulse disk having one slit, and photointerrupters solder
bound to the connector PCB SA and corresponding to the
respective disks. Apulse is generated as each slit of the disk
passes the sensor.
The dot pulse sensor outputs asignal (DP) which is used to
control the print solenoid, paper feed, and mlor change. On
@
the other hand, the home position sensor issues asignal
(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 asignal (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 atiming 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 Uand L, and is fixed to
the timing belt. When the motor is rotated by aprint 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 aprescribed timing to stop the carriage. At this
time, the head stops at approximately the center position.
Itfix A
Tming
rriage drive pipe L
Tming belt SA
(4) Printhead mechanism block
The printhead mechanism consists of anose assembly housing
nine wires, asolenoid base comprising solenoids and armatures
for driving the wires, and a cover for keeping the armature
stroke to aprescribed 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 adot on it.
HP sensor (photointerrupter)
-15-

..,.,”., ,..., ”..... ”.. ””....—”---- ... - --- - -—
ER-04RP
‘T
Print
In 1topper
spring
Nose assembly’ \Solenc)id base
(5) Paper feed mechanism
The paper feed mechanism consists of the paper feed power
transmission mechanism described in 2-2-2. (l)-(2), apaper
feed solenoid which controls the clutch mechanism, aPF trigger
lever, and a clutch cam. The PF shaft is driven to feed the paper.
The clutch mechanism has aspring clutch, consisting of aPF
drive gear BK, aclutch gear BK, aclutch 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.
PF shaft ,PF shaft gear
PF drive gear BK
v
\‘% eed
d
Drive ge
rlever
PF slip spri
PF Clutch cam /\
Clutch spring Clutch gear BK
@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.
‘Rear
Pressure roller T-1
Pressure roller spring Bottom
(6)
[Paper feed overload protection mechanism]
Asafety 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 agreater load than aprescribed torque,
it slips on the PF shaft to absorb the overload.
Side plate R
/
PF
ive gear
Sll slip gear
yl Pivot drive gear
[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 aknob 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.
—.Knob
PF
—
PF ratchet \.
PF shaft gear
Ribbon mechanism biock
The mechanism biock consists of aribbon cartridge in which an
endiess ribbon is housed, aribbon 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 con-
tinuously taken up.
The ribbon drive poie SA is coupied to the ribbon drive gear via
aratchet, 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.
m
Ribbon drive gear
-16-

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
[Safety mechanism]
If the ribbon gear binds because of aribbon 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
(7) Color change mechanism block (for Dtype only)
The mechanism block consists of aribbon plate on which to
mount aribbon cartridge, acolor change lever, acolor change
solenoid, aribbon 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 ared 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 anon-printing area at the extreme right
or left, to avoid accidental resetting during printing.
Ior change
solenoid
ge lever
Color c~ange spring %~ib)on re,et cam [Black printing]
Iin
printing]
[Resetting]
Itable
Fixed
-17-

9. Troubleshooting
9-1. Repairing procedure
Repairs should be done in accordance with Section 3“Troubleshoot-
ing 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
/
‘- ~up.: ~...y>./[://
/f
ii
\4 2 8 6 9 COMMON 7531F.G
\10 117 1
Connector BConnector A
1r
Printhead SA
Head FPC
9-2-2. Wiring diagram FPFcoil
DC motor
-=
I
o-
L
!
iIIIIll
Lrlll I I
Connector CC:nnect:r A
11’ It K,1
r’
6-
7 4 24\’
8-
s
1..W”.. II 11~
6+24V ,
IIL * I I 81+24
ml~ ,
91+24V
10 +24\r
13 FGND
I[II IIS FCND
Connector PCB SA Y
11I
1[ I1iI
Validation (option) I
TI1
m
RP sensor m
Paper end (option)
-18-
1
Connector PWB SA
UKOG-6669RCZ
I
‘o control block
I
To control
block
Wiring diagram