Sanyo ECR105 User manual

065.005. 1
067.673.4
SANYO
nn
QUEL
-
07170
SERVICE MANUAL
ECR105/115
ELECTRONIC CASH REGISTER
ECR105 ECR115
SPECIFICATIONS
Number of Departments: 2
Number of totals: 9
Battery: Rechargeable Ni-Cd Uatteries for memory protection
Memory holding time: Approx. 1.000 hours without Power supply from AC
Printer: Digital wheel type serial printer
14-digits for numeric and 1 digit for symbol
Indicator: Green fluorescent multi digits display tube
1 digit for symbol + 1 digit for repeat counter + 7-digits for amount
Up to 7 digits: Ten key system
Multiplication: Quantity & 4-digits
Price & 5-digits
Result & 7-digits
Number print Ps 8-digits
Number of figures for input:
Number of figures for total: Non-resettable GT: 12-digits
Other amount total: 8-digits
Counters: 4-digits
Roll paper: 57.5mm x Max. 80 (¢) mm
Inking: Ink roll R-S874274 (Purple)
Operation temperature:
Power supply:
Power consumption:
Dimension:
Weight:
0~ 40°C (32 ~ 104°F)
AC Local! Voltage + 10%, 50/60 Hz
Max, 6W
318(W) x 408(D) x 242(H) mm (ECR105)
405(W) x 423(D) x 250(H) mm (ECR115)
Net 5.8Kg (ECR105)
Net 8.0Kg (ECR115)

INDEX
: Page
CABLE CONNECTION DIAGRAM .........0.0.0 0002 eee ee 1
SCHEMATIC DIAG RAM vic iee5 2-5 hs ise aa RO eed oS Se dee, Stee a eds ews eo ee ee ee 2,3
P.C.-BOARD' DIAGRAM (s.c%e-e5-2 OS dee eS oe eee Med Da Sele a, SSE ee Bohl TE GRAS ee 4,5
BLOCK.DIAGRAM © 22s: oh eo ed AY eS eee eed one ee ae eee AO te a eal ale 6
OPENING THE.UNIT 25 co-23 4. che OE ie Oe le eee ae lochs AG esis w bee ee me 6,7
REASSEMBEING
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hanes
ol
cutee
Rats
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Ag
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7
SETTING OPTIONAL SELECTIONS... 0.2.0.0. 2 ete ee te eee 7,8
DEVICE
SPECIFICATIONS
....
20.0.0...
cc
ee
ee
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ete
eens
8-10
DESCRIPTION OF CIRCUITS .. 0.0.0.0... 2 ee eet eens 11-13
PRINTER: 2: ooo kd 8 eo eee Ba ee Et SE 8 a ec eter, yea Ph De SE 14 — 24
EXPLODED:
VIEW
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25
PARTS EIST vs, sense setters 3d) Berean acs ee Ste act aealles Bod ee Ree EN ene ae paar ae eS, ay eA gee ge WE ath 26 — 28
ORAWER EXPLODED VIEW/PARTS LIST ........ 0.00 ce ee ee ee eet eee eee “2... 29, 30
PRINTER MECHANISM EXPLODED VIEW/PARTS LIST .. 0.0... 0... eee ee eee 31
CABLE CONNECTION DIAGRAM
POWER
PCB
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4
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V7 LILEILLLILLILIZILLILG. M2 12> AC
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115
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Gas
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PRINTER
ECR 115 only
M1
(MAIN) PCB
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SCHEMATIC DIAGRAM
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FG98B7
REAR DISPLAY
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PC
470/10
Wired
:
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R40
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O5ea2 5.6 sw
040
>
05442
as7
«
|
Prater csioi csi
“42-5

P.C. BOARD DIAGRAM
(
)
bracket
diode
is
for
ECRII5
only,
((
))
bracket
diode
is
for
ECR
105
only,
.
.
NOTE
M1 P.C.B
re
:
C.B
M2 P
g'O'd
LI
gore
2a,
i
i
OI
OAS
|
mereseenaifiess
SOR pap peg
eS
0
ae

BLOCK DIAGRAM 1c2
KEY MATRIX
MODE MATRIX
KEY RETURN SIGNAL
MODE RETURN SIGNAL
RES
X2 XT1 XT2
x1
OPENING THE UNIT
1, Disassembling.
(1) Disconnect AC cord.
(2) Detach the printer cover.
(3) Push and lift the loweredge of cabinet (A).
Fig. 1
2. Removing the printer.
(1) Disconnect the flat cable (B)) and earth line (©).
TP
tP
PRINTER
M-4211
Pew —o] ORE
1C3
DRIVER
1c4
ORIVER
Qi
DRAWER
BUZZER
POWER DOWN
DETECTION
CIRCUIT 1C1, QZ
RESET CIRCUIT
1C1, Q2
Fig. 2

(2) Pull the hook ((O)) and lift the printer.
(3) Removing the printer from cabinet.
Wiis
Printer Unit
3. Removing the main PCB.
Fig. 4
(1) Turn off the battery switch located beside the Nicd
battery.
(2) Disconnect the connector of power, printer and etc.
(3) Removintg 4 screws fastening the main PCB and metal.
(4) Push 2 hooks ©) and take out the metal.
(5) Removing the main PCB from cabinet.
REASSEMBLING
(1) Avoid misconnection between connector and terminal
of PCB, confirm the connection is correct and tight it.
(2) Plug in AC cord at first, then turn on the battery
switch,
CLEAR THE NON-
RESETTABLE TOTAL AND
Z-COUNTER
It is possible to clear the Non-reset-
able total and Z-counter by the
following key operation.
(P Mode)
(1) (90) O (5)
(2)
(3) CASH]
This operation will clear all totals
maintained in the memory to zero
(except the date and time), and
printout all characters. (Fig. A)
(olejelslejeleleleleleleleien: 4
T111777171319104
22222222222222K2
33333323333333M3
GO444444444444T4
5555555555555590
66666E66666666 N+
TITITTTITITTITI To
BESSESSBSEBESBNX
e99999990900S999fa
rIxx99x9x99999 KS
wore recesesoeree XK
SETTING OPTIONAL SELECTIONS
(1) Shift of decimal point
The number of digits after the decimal point can be
selected out of DP = 0, 1, 2 and 3 by diodes at the
location marked DPO, DP1, DP2 and DP3. (Fig. 6)
DPO, DP1, DP2 and DP3. (Fig. 6)
(D26)(D21)(018) (D13)
(2) 5 Rappen rounding (for Swiss market)
The least significant digit of the result of % or tax
calculation will be rounded to 0 or 5 as follows:
Normal calculation : Round to
O~2 : 0
3~7 : 5
8~9 : 10
(3) Department (M115 : D24), Paper feed (PF : D22)
These diodes should be always mounted.
ed
om
Psess ord &
eS
on SS aceen: L \_
aCuruMm ema us
acento
2.
14
ic

(4) % Mode, Tax Mode, Japan Mode Absolute Maximum Ratings (Ta = 25°C)
These mode can be selected by diodes at the location
marked EUR (D23) and DOM (D716). (Fig. 6)
The combinations are shown in the following table.
Power Supply
Voltage
Input Voltage
Operation
Temperature
reea {x [eI
ree ee
© : Add the diode.
X : Do not add the diode.
Storage
Temperature
$390
Besides the above selection it is necessary to change S20
rubber key. Slo
soo
(5) Don’t use diodes at the location marked D14, D17 POO/INT4 O
(CV) and D25 (45P). (Fig. 6) Po1/SCK O
(6) Mode switch selections po2z/S0 0
ECR 105: Add the diodes marked D4 (PS), D6 (R), D7 ae
(Z) and D8 (X). (Fig. 6) PIV/INTIO
ECR 115: Add the diodes marked D12 (PS), D19 {Z), PIZ/INT2Z O
D20(X), 027(R). (Fig. 6) P13/TI0 ©
P200
P210
DEVICE SPECIFICATIONS P20
P23/BUZ O
IC2 uPD75208 P30 0
The uPD75208 is a general purpose single chip 4 bit micro- P31 0
computer. This is fabricated with C MOS technology. PO
This contains a ROM, a RAM, 1t/O Ports, a fluorescent eae
display controller/driver, etc. PEO
The yP075208 is packaged in a type of 64 PIN shrink P62 ©
plastic DIP package (uPD75208CW). be :
P4l 0
Paz oO
P43 O
PPO O
X10
X2 ©
Fig. 7 Vss0
Vo Except display output pins
Output voltage
Display output pins
Per pin, except display output pins
O Voo
QO Sé4
OSs
O $6
Ss?
S8
$9
Vers
Vues
QO T18/S10
QO T14/S11
© TIV PHO
O T12/PH!
O T11/PH2
O T10/PH3
OT?
OT8
OT7
Oo T6
OTS
OT4
O T3
OT2
O Tl
Oo TO
OQ RESET
OQ PS}
O PSs2
O PS!
© PSO
QO XT2
O XTi
uPD75208CW
Output Current High- 10H | Per pin, TO to T15
t
|
|
Output Current Low lou
Total, all outputs
|
Per pin, SO to S9 —15 mA
| 1 —30 | mA
| Total, except display output pins i —20 mA i
; | Total, display output pins -—120 | mA
; Per pin 17 “mA
60 mA
: : i
| Total Power (1) Consumption Pr Plastic Shrink DIP | 600 i mW
-8-

Signal description (uPD 75208)
Pin name
POO/INT4
PO1 SCK
POQ2 SO
PO3/SI
P10/INTO
PIT1/INT1
P12/INT2
P13/TIO
P20
P21
P22
P23/BUZ
P30
P31
P32
P33
P60
P61
P62
P63
P40
P41
P42
P43
PPO
x1
X2
Vss
XTI1
XT2
P50
PS1
P52
T9
T10/PH3
T11/PH2
T12/PH1
T13/PHO
T14/S11
T15/S10
VLOAD
VPRE
sg
$8
$7
$6
$5
$4
VoD
Signal name
at
a)
2 OQ
VEL
VPRE
Sa
Sb
Sc
Sd
| 7~o000
1ooo0o!loooooooooTt1ilttittitt+ |+oooo0orTr------| o0001---1
Description
Segment signal
o”
ow
Power down signal
Not use
a
oe
Timing pulse
Timing auxiliary pulse
Reset pulse
Not use
Key scan signal
”
”
Not use
Key return signal
Buzzer signal
Main clock
“ow
OV
Sub clock
Not use
wo
Power on reset signal
Digit signal
Drawer open signal
Rewind motor drive signal
Printer Motor Signal
Printer Solenoid Signal
Not use
Not use
—23V
—3.6V
Not use
ow
Segment signal
}
|
Not use |

I1C1 TC 74HC132P 1C3, 1C4 M5272L
* QUAD 2-INPUT SCHMITT NAND GATE * Current driver (high active type)
Pin Configuration
Output — function
NT our _]
Pa cio |
TRANSISTOR ABSOLUTE MAXIMUM RATING
VcBO VCEO VEBO Ic i
28C3331 LF Amplifier 100 ~ 800
2SD863 Voltage regulator ms es 100 ~ 200
280536
Small
signal
Amplifier
40
30
He
400
100
~
200
2SC945
LF
Amplifier
60
50
100
250
|
200
~
400
CIRCUIT DRAWING
c
Gm t nt eeger enna
< Bottom view >
ABSOLUTE MAXIMUM RATING
ISURGE (mA)
1S2471C | High speed switching ' 130 VF = 1.2V (IF 0.1A)
1S2473
High
speed
switching
|
40
400
VF
=
1.2V
(IF
0.1A)
0S442 High speed switching [ 35 500 VF = 0.68V (IF = 1.5mA)
0S135
Rectifier
,
200
50A
VF
=
1V
(IF
=
1A)
DSF10 Rectifier VF = 1V (IF =1A)
i GZAS. 12 | 500
| GZAQ_ 1x
ZENER
DIODE
ABSOLUTE
MAXIMUM
RATING
|
ave
IR
(uA)
;
VR(M)
|
TYPENO.
|
P
(mw)
IzM
(mA)
|
Min.
(V)
|
GAZ2.7x
|
500
|
1250
1906
|
6.2500
|
«2275-'
10
+
100
|
GZA4.7Y
!
500
|
1250
90
|
4.65
|
5.00
;
10
,
10
1250
|
=
86
:
0
;
840
j
5
|
1
{
1
— 10:—

DESCRIPTION
OF
CIRCUITS
(ECR115
only)
General Description
display
1)
M2P.C.B. Savers < leaeee
AC local Noise Supply ‘ ahaa
Voltage
Preventin
:
AS
Y
yc
Printer
reverting Circuit 1 Logic circuit
Circuit :
Ni-Cd
Battery
Power Supply Section.
(1) (2)
Noise
Preventing Transtormer
Circuit
AC
local
Rectifying
Voltage Circuit
Vp -GND : 8.6V typ.
Vp’ —GND : 7.4V typ.
Vit —GND : —23V typ.
Vcc —GND_ : 5.0V typ.
Veom—-GND_ : 5.0V typ.
(While AC is supplied)
VF —VEF : 3.8V AC typ. (V.E.)
oc-oc
CONVERTER
(1) Noise filter circuit
Alternating input current is led to transformer through
Fuse and noise filter, composed of C and L. The filter
components work not only to prevent internally
generated noise from being fed back to AC fine, but
also to attenuate the spike voltage for prevention of
the effects to Power Supply Circuit. The ring core
wound by GND wire of AC cord also works as a noise
filter.
(2) Power transformer
Power transformer transforms the AC input voltage.
R-W770861 : for AC 100/115V
R-W770861-1 : for AC 220/240V
— ow a we 68 wo em om om om om om a om om ow awe eT a
r I ! ! | 1 i | | | 1 !
battery
Fig. 11
(3) Rectifying circuit
AC input, having transformed by power transformer, is
bridge-rectified by diode D36 ~ D39 and C25. The
voltage after rectification is 4 ~ 10VOC for the rated
input.
tT
| | |
l l
|
'
i lie eal --------4
g
e)
<
3
=
Vee
<
z
oe eee

(4) DC-DC converter
At the power on, Q5 turns ON by the base current
through R50. The collector current of Q5 generates the
voltage on the winding N1 and N2. The positive
voltage on the terminal 7 for the terminal 6 (GND)
increases the collector current of Q5 through R55 and
C23. When the transformer gets satulated, the Q5 turns
OFF. After some period, the level of the base of Q5
goes up by the charge current through R50, and Q5
turns ON again.
The circuit repeats this cycle. Thus the voltage is gener-
ated on N1, N2 and N3, 034 and 035 rectifies the
voltage of N2. When Vcc exceeds the specified zener
voltage, the current flows through ZD2 and D33 and
turns Q4 ON and Q5 OFF to regulate Vcc and VLL to
the specified voltage.
Q5___collector be—teye
in3
+20V min 30kHz.
approx.
+10V
approx,
GND —
Fig. 13
Display
The uPD75208 has a built-in display controller which reads
out the contents of the display memory and automatically
generates digit and segment signals and a high voltage out-
put buffer which can directly drive fluorescent display.
The output of timing signals and segment signals are as
follows. (Fig. 14)
—12—
———— Osplay cycte __
(ae e lany [aot eee
° fel
ae gy Seen | es ee
J ee -
|
|
AoA AH
o
eres i ee Se
|
reg: fee rere
on ee a
eae Ceres icy (ee eee
| | Key scan timng
Oe TE Gb GS GE? GO CAD ED CED CD GD GE Gd GD
Fig. 14
ot
4 4 4
~~ @
a
US ieee, | ny
da oP
Name of Segment
Fig. 15
Key scan
KT1 ~ KT7 are provided as inputs for numeric keys and
function keys from CPU (IC2), When a key is depressed.
KTn (KT1 ~ KT7) pulse appears on Km (KO ~ K3) line
through the keyboard. Then CPU catches the pulse and
decides which order to perform by matching it up with
"the signal CPU discharged. Also, KTn signal is used for mode
control lock.
in case of depressing[1]Key
kt J L011)
K3-——_——"L"
KT1~ eaamelia Selteas K3
eo eee
GhDeed eee ee
Fig. 16
iliac a a Nt ce a A hs et Be te ae) Ne od Ta Bh Ain ros il,

Power down detecting circuit
This
circuit
detects
the
power
failure
or
the
power-on
and
generates
PD
signal
to
keep
memory
or
to
prevent
the
circuit
from
erroneous
operation
in
the
unstable
traditional
period
of
power
supply.
SS
The
level
Vp
drops
when
the
AC
power
supply
is
turned
off
or
when
an
instantaneous
power
failure
occurs.
The
circuit
detects
the
Vpp
falling
down
less
than
some
2.3V
and
make
the
PD
signal
Low-level.
On
receiving
PD
signal
the
CPU shelters
the
present
program
counter
and
the
contents
of
each
register
from
extinction.
Also
the
CPU
.
stops
the
clock
oscillation
of
X1
(4.19MHz)
to
save
the
Fig.
21
power
consumption.
When
AC
power
supply
is
turned
on,
.
PD
signal
is
recovered
High-level.
CPU
will
active
again.
;
Drawer
circuit
:
V
Vp
When
the
CPU
outputs
high
level, [C4
(1
pin)
turns
on
to
cM
drive
the
solenoid
of
drawer.
.
See
ee
ae
VCM
1C2
DRW
50
Pin
|
es
GND
ICA
Vv
{1
Pin)
a
ar
ee
7
GNO---[-_
g0ms:—>|
Fig.
22
Fig. 17
Rewind
circuit
Rewind
motor
controls
RW
signal.
It
is
active,
when
printer
p<
Ac
Power
08
works.
as
es
ee
|
'
ae
a
:
---VCM
:
{perce
POET
SOW
SLOT
mes
RW
me
a
See
ff.
{I1C2
51
Pin)
GND
Hi
IC4
in
ss
erat
eth
Ss,
Note
H
(7
Pin)
ae
Po
|
|
---GND
Fig.
18
CPU
clock
oscillation
Fig.
23
xT1
;
Reset
circuit
3v
FS
ST
This
circuit
generates
RES
signal.
Reset
signals
reset
the
ov
ain
CPU.
This
signal
is
generated
by
turning
on
the
AC
with
xT2
VcM
lower
than
about
2.6
volts.
If
the
battery
voltage
is
5V
normal,
this
signal
is
not
generated
even
if
the
AC
is
off.
a
OV
x1
Noo.
kn
kk
_
_eee_e_—eee
ee
X2
Yeu
:
5V
wes
—|
|
Fig.
19
ON
:
Buzzer
circuit
Fig.
24
When
the
numeric
key
is
depressed
or
error
inputs
has
been
done,
the
CPU
(IC2)
generates
a
buzzer
signal.
The
signal
is
driven
by
transistor
Q1
and
the
buzzer
sounds.
ae
@en
tL.
Liens
\
14V
2
@4-L_/4-L+L-U_t--6np
}
‘
1
tne
240us
240u5
<< BZ. "ON" ——#e— BZ “OFF”
Fig. 20 -—13-

PRINTER
Timing Signal
Printing
of
one
line
(printing
of
four
columns
'’6.
RF—")
Paper
feeding
and
Carriage
return
Selection
Printing
Selection
Printing
and
advancing
Selection
Printing
and
advancing
Operation
x
1){Motor
drive
pulse
signal
Reset pulse signal R —
m
1)
[Reset
puise
RP
—
c ae)
‘ cle ‘1 H
2 ‘
ure ie Cho a |
ote pa]
an =; ee
[ Lf
' rr ' ’ t
' t" t | 7 t
‘ '
i ’
' t
a
7 75 1
ri” Cy =<
‘ > an “a ‘
’ tc. er Hey ' oo st |
Timing puise signal T
Timing auxiliary puise
signal t
=
1)
[Timing
pulse
TF}
|
Operation of hammer
f
|
nN
E
m1) (Trigger coil drive pulse} 9
Rotation
of
print
wheel
a,
Movement of print wheel
Operation of positioning
\
|
iit
it
li
1
Paper
feeding
—
<<
(Equivaient
to
25ci.)
Stop
(Equivalent
to
1Ocl.)
lac.
23486786910 2 O12
pet
re
ee
Fee
go
oe
8
ae
a
|
ee
eee
ee
el
ass
Led
LL
a
ae
.
:
eae
:
;
herereerys
:
'
4)
a
1)
[Timing
pulse
TP
+
m1) [Trigger coil drive pulse
Rotation of print wheel
Operation of hammer
Operation
of
positioning
_«
hy
ed
plate
ne
ee
ue
5
/—_—
Paper feeding
Notes:
#1)
The
signals
and
pulses
in
(nave
to
be
provided
by
the
user
of
this
printer.
#2)
For
the
width
of
the
trigger
coil
drive
pulse
for
the
top
column
in
a
line,
the
value
equivalent
to
six
times
as
large
as
the
timing
pulse
intervai
for
selecting
the
first
column
should
be
added
to
the
timing
pulse
interval
TW2
at
the
time
of
selection.
Similarly,
the
value
equivalent
to
Fig.
25
#5)
six
times
as
large
as
TW1
should
be
added
to
the
timing
puise
TW1
at
the
ume
of
selection
(empty
position)
during
the
paper
feeding.
=
=415
(Equivalent
to
1Oel)
[_
tae:
et
Continuous
printing
(indicated
by
a
line
_.__)
(21 cl.) Printing and advancing | Selection
nn Oo
2 ees
LS
-_
The
timing
pulse
signal
T
for
printing
and
advancing
may
be
indicated
by
a
broken
line.
The
timing
auxiliary
pulse
signal
t
for
printing
and
advancing
may
remain
in
a
state
of
“make”
with-
in
the
time
four
times
as
long
as
the
timing
pulse
interval
TW1
for
selecting
the
first
column,
and
it
may
be
in
a
state
of
“break”
in
other
areas
of
printing
and
co-
jumn
advancing.
In
this
case,if
the
timing
auxiliary
pulse
signal
t
is
in
a
state
of
“make”,
the
timing
puise
signal
T
is
made
until
the
final
point
within
the
time
four
times
as
long
as
the
timing
pulse
interval
TW1
or
is
not
made
until
the
final
point
for
printing
and
ad-
vancing.
cl. represents the cycle of timing
puise.

PRINTER
Timing detecting
The
detecting
mechanism
of
this
printer
employes
a
mecha-
nical
contact
system.
It
generates
two
series
of
signals
{Timing
pulse
signal
T
and
Timing
auxiliary
pulse
signal
t)
corresponding
to
the
types
on
the
print
wheels,
and
also
generates
a
Reset
pulse
signal
R
per
one
rotation
of
the
print
wheel.
The
signals
thus
obtained
are
shaped
and
used
as
the
timing
pulse
signal
and
the
reset
pulse
signal.
4 Carriage return and paper feeding
When the type for the top column in one line print-
ing, the carriage return and paper feeding are per-
formed by adding the timing pulse interval TW2
between TPn and TPn + 1 and the value equivalent
to six times as large as the TP interval TW1 measured
for the type selection for the first column in Item
2 above to the width of the trigger coil drive pulse.
5 Turning the motor OFF
(5) Qui
1
ick paper feeding
The paper is fed the first one line in the same manner
as in the case of 2 in Item (4) “Paper feeding for
one line’’,
For printing of the lines from the second line on,
the subsequent timing pulse TP is counted while the
motor is running, whereby permitting the selection
of the empty type (TP10) from the twenty-first
pulse generated, as in the case of 2 in Item (4)
T13
To
tN)
When
the
top
column
in
one
line
printing
has
been
“Paper
feeding
for
one
line’’.
Fining
pilewaiouly
printed,
the
print
wheel
starts
running
and
generates
3
Quick
paper
feeding
is
performed
by
repeating
the
the
timing
pulse
TP.
Interrupt
the
motor
drive
signal
operation
described
in
2
above.
'
t13
to
at
the
fourteenth
timing
pulse
TP
after
counting
the
4
Turning
the
motor
OFF
pulses
from
the
first
pulse
generated,
The
operation
described
in
3
of
Item
(4)
is
per-
Timing
auxiliary
pulse
signal
t
Notes:
formed.
(The
motor
is
turned
OFF
for
one
line
1)
Confirm
the
reset
pulse
between
the
timing
pulses
paper
feeding.)
,
|
R
i
:
TP13
and
TPo
during
the
one
line
printing
cycle.
!
2)
The
first
timing
pulse
generated
after
the
ad-
Reset
pulse
signal
R
vancing
operation
cannot
be
used
for
the
type
TPi3
TP
selection,
Timing pulse TP
(3) Continuous printing Drum Pattern
RPo 1 The first line is printed in the same manner as in
the case of the first line in [tem (2) above.
2 For printing of the lines from the second line on,
the subsequent timing pulse TP is counted while
os the motor is running, whereby permitting the
Fig, 26 printing of the first column in the second line
PRINTER OPERATION DURING ONE after the twenty-first pulse is generated, as in the
PRINT CYCLE case of “Printing of one line’ 2 , 3 and 4 in
Item (2) above.
The printer operation during one print cycle is described, 3 Continuous printing is performed by repeating the
referring
to
Fig,
25.
operation
described
in
2
above.
(1) Initialization
4 Turning the motor OFF .
It
is
necessary
to
perform
the
required
initialization
The
operation
described
in
5
of
Item
(2)
above
Prior
to
printing
or
paper
feeding
in
orded
to
con-
is
performed.
(The
motor
is
turned
OFF
for
one
line
firm
that
the
carriage
remains
in
the
waiting
state
(for
printing.)
the
first
column).
The
initialization
is
finished
by
feed-
(4)
Paper
feeding
for
one
line
ing
the
paper
by
one
line.
1
The
timing
pulse
TP
after
starting
the
motor
by
ap-
Detection
wheel
-
(2)
Printing
of
one
line
plying the motor drive pulse signal is counted, and
Fig. 27 1 The printer counts the timing pulse TP after apply- the reset pulse RP after counting the eighth pulse
ing
the
motor
drive
pulse
signal
to
run
the
motor.
is set as RPo and the first timing pulse TP after the
The
reset
pulse
RP
after
counting
eight
pulses
is
19 18 $7 {6 1§ 14 33 12 I! 10 9
Reset pulse RP
reset pulse RPo is generated is set as TPo.
set
as
RPo,
and
the
first
timing
pulse
TP
after
the
2
Paper
feeding
reset
pulse
RPo
has
been
generated
in
set
as
TPo.
The
empty
type
(TP10)
is
selected.
Simultaneously,
2
Selection
of
type
the
timing
pulse
interval
between
TP10
and
TP11
Apply the trigger coi! drive pulse to the trigger is measured to obtain TW1. It is made possible to
magnet between the timing pulses TPn and TPn + select the empty type on the print wheel and to
1 which correspond to the desired type. feed the paper by adding the measured TW1 and
Simultaneously, measure the timing pulse interval the value equivalent to six times as large as TW1 to
between TPn and TPn + 1 to obtain TW1. the width of the trigger coil drive pulse.
After
the
desired
type
has
been
selected,
the
print
3
Turning
the
motor
OFF
wheel will stop (the timing pulse remains to be After the paper has been fed for one line, the print
TPn + 1) and advancement will be performed auto- wheel starts running, and the motor drive pulse
matically. signal is interrupted as the fourteenth timing pulse
3 Selection of type for the next line TP generated after counting the timing pulses from
The print wheel starts running again to cause the the first timing pulse generated.
first
timing
pulse
to
be
TPn
+
2,
permitting
the
type
Note:
selection
from
the
second
time
pulse
TPn
+
3.
Then,
Confirm
the
reset
pulse
RP
between
the
timing
the
type
selection
is
performed
in
the
same
manner
pulses
TP13
and
TPo
during
the
one
line
paper
as
in
Item
2
above.
feeding
cycle.
a6 . Gen

Specifications
1.1 Features
The
Micro
Serial
Printer
Model-42III
is
designed
to
print
the
results
obtained
from
hand
held
electronic
calculator
and
has
the following features.
1.2
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Very compact, light-weight design.
Clear print quality avaiable.
Carriage return is possible in any position, resulting in inherent high-speed printing.
Quiet drive and minimized printing noise.
Quick paper feeding and paper release are possible.
Power is supplied by UM-3 manganic battery cells when necessary (low power drive).
Ordinary paper can be used.
Motor speed control is not necessary.
Specifications
The specifications of Model-42III are shown below. For further details needed for your circuit and housing design, refer to
the
separate
“SPECIFICATIONS
OF
Model-42III"
and
“GUIDE
TO
CIRCUIT
AND
HOUSING
DESIGN
FOR
Model-42III.
1
2.
3
as
10.
11.
12.
13.
14,
15.
16.
17,
. Printing system
Print column capacity
. Character position
. Character size
Character spacing
1) Column spacing
2) Line spacing
Printing speed
1) 19 columns
2) 7 columns
Printing paper roll
1) Type of paper
2) Paper width
3) Outside diameter
4) Paper thickness
5) Basis weight
Paper feeding
. Inking
Ink roller
1) Color
2) Life
3) Standard
Motor
1) Terminal voltage
2) Mean current
Detector
Trigger coil (magnet)
1) Terminal voltage
2) Direct current resistance
Connection Printer side
Guaranteed operating temperature
Reliability (MCBF)
Overall dimensions
Weight
Print wheel selecting type serial printer
19 columns max.
Symbol column 13 positions + 1 empty position
Numeral column = 14 positions
1.6mm(W) x 2.3mm(H)
2.1mm between numerics, 2.6mm between numeric and symbol, 2.3mm
between symbols
4.6mm
(Average speed at 6.0 VDC)
Approx. 0.9 line/sec.
Approx. 2.2 line/sec.
Ordinary paper
57.5 +0.5mm
¢80mm or below
0.06 ~ 0.85mm
47 ~ 64 g/m? (40 ~ 55 kg/1000 sheets/1091 x 788mm)
Quick feed; Approx. 8 line/sec, paper release mechanism attached.
Purple or black
Refer to the separate ‘‘SPECIFICATIONS OF Model-42111”.
{R-40
6.0 *9-2 voc
Approx. 0.25A (at 6.0 VDC, 25°C, 19 columns 7-character shift print ing)
Mechanical contact
Reset pulse signal R, timing pulse signal T, timing auxiliary pulse signal t
+0.5
60°05 voc
Approx. 20Q (25°C)
Jumper wire
o°c ~ 50°C
700,000 columns
86mm(W) x 49.5mm(D) x 19mm{H)
Approx. 90g
—~18—-

Repair
Repairs of the Model-42III Micro Printer are grouped into two cleases (A and B) as defined in Paragraph 2.1 below, according
to
the
difficulties
involved.
Be
sure
to
have
the
printer
repaired
by
those
persons
who
are
qualified
at
least
for
the
correspond-
ing repair class.
2.1 Repair Classification
Class A: General knowiedge of the construction and operating principle of the printer, as well as basic repair technique
is required. Neither special experience nor trained skill is required.
Class B: Advanced knowledge of the construction and operating principle of the printer is required.
Techniques for handling special tools, jigs and measuring instruments in disassembly and assembly as well as
Practical repair experience are required.
2.2 Repair Procedures
Should a trouble occur, refer to Paragraph 2.4 ‘Troubleshooting Table” to confirm the nature and condition of the
trouble,
determine
the
cause
of
trouble,
then
check
the
defective
part
and
perform
the
suggested
remedy.
Troubleshoot-
ing Table is divided into the following five columns:
(1)
NATURE
OF
TROUBLE:
Find
the
nature
of
the
trouble
in
this
column.
(2)
CONDITION
OF
TROUBLE:
Compare
the
actual
condition
of
the
trouble
with
the
description
given
in
this
column,
then
confirm
whether
or
not
they
are
identical.
{3)
POSSIBLE
CAUSE:
Possible
causes
of
the
trouble
are
listed
in
this
column
for
the
respective
trouble
conditions.
Determine
the
cause.
The
next
column
“REPAIR
CLASSIFICATION”
suggests
you
the
level
of
repair
skill
required.
(4)
CHECK
POINT:
Points
of
the
mechanism
most
likely
to
cause
the
trouble
are
listed
in
this
column.
Check
each
item
according
to
the
instruction
in
the
column
and
locate
the
defective
Part.
(5)
REMEDY:
The
remedy
for
the
corresponding
cause
of
trouble
is
suggested
in
this
column.
If
the
trouble
persists
after
the
implementation
of
the
suggested
remedy,
check
other
items
in
“POSSIBLE
CAUSE”
column
and
perform
the
corresponding
remedy.
When you desire to visually examine the condition of gear trains and the operation of parts operatively associated there-
with, do it while manually turning the motor gear counterclockwise.
1.3 Terminal Contacts Arrangement
Connection
Terminal
No.
The
side
of
printer
detector
is
designated
as
1.
Trigger coil (—) 1
Trigger coil (+) 2
Motor (+) 3
Motor (—) 4
Timing Pulse T 5 O—————o-—c
Reset Pulse R 6 O——————o-—
Common line for C 7
detector
Timing Support t 8 O_o"
Fig. 29
~19-

2.4 Troubleshooting Table
REPAIR
ee POSSIBLE CAUSE CLASSI-
FICATION
NATURE OF
TROUBLE
CHECK POINT REMEDY
1. Motor does | Turning power | 1) Jumper wire C3 © Verify electrical continuity Resolder the parts or replace
not run. ON does not is not conducting. across the motor power the jumper wire C3.
cause the motor terminals according to
to rotate or the Par. 2.3.
rotation is
locked.
@ Check electrical continuity @ Repair the input power side.
across the motor power
terminals according to
Par. 2.3
— Standard: Refer to
1.2-10.
2) Improper power
supply to motor
A20 {power supply
circuit)
® Turn by hand the first reduc- @ Remove the foreign matters.
tion gear B15 counterclockwise
and check if each mechanism
operates properly.
Rotating mechanism
is clogged with
foreign matters.
© Turn by hand the first reduc- © Replace the hammer A6.
tion gear B15 counterclockwise
and check if the print wheel
assy and related mechanisms
operate properly.
Hammer A6 and
Print wheel assy A7
are locked,
@ Modify the mounting position.
Print changeover cam © Check it.
B7 is mounted
improperly.
@ When no troubles are found by | @ Replace the motor A20.
checking the aforementioned
Causes 1) to 5).
Failure of motor
A20.
Jumper wire C3 © Check electrical continuity e Resoider the parts or rpiace
2. No column | Motor rotates
can be normally, but is not conducting. across the terminalis of the jumper wire C3.
printed, no column can detector assy C2 and trigger
: be printed. coil assy B13 according to
Par. 2.3.
e@ Reptace the trigger col assy
B13.
Coil of the trigger © Measure the resistance vaiue of
coil assy B13 is the trigger coil assy B13
broken. according to Par. 2.3.
— Standard: Refer to Par.
1.2-12.
© Refer to Cause 5) of Nature @ Modify the mounting position.
of Trouble 1.
3
Print changeover cam
B7 is mounted
improperly.
4) Breakage of the B @ Visually check after removing e Replace the hammer tans fer
hammer spring of the ink rolier assy from the lever assy AS.
hammer transfer carriage A4,
lever assy A5.
Faulty engagement ®@ Modify the engagemen.
of the print can A12 @ When disengagement i jikely to
with the hammer i occur, bend the hammer soring
transfer lever assy : of hammer transfer leer assy
AS. AS to permit easy enqgerrient.
2
: Heating elements are 8 @ Check the circuit side to be @ Modify the circuit sid
| : not energized (input H : sure that the input pulse is
‘ pulse isnot applied = | . applied properly.
' properly for the | — Standard: Refer to ‘‘Speci-
| trigger coil assy B13)! | | fications’.
(QO

REPAIR
NATURE OF| CONDITION OF POSSIBLE CAUSE CLASSI-
CHECK POINT REMEDY
TROUBLE TROUBLE FICATION
3. Printed Upper and
characters lower, and right
are chipp- and left portions
ed. of the printed
characters are
chipped.
4. Omission Omission of
of charac- | character
ter. occurs in all
columns.
5. Erroneous | Prints a charac-
printing ter different
from that to be
printed.
>
1) Platen assy A17 is
mounted improperly.
2) Wear oft print cam
At12, hammer
transfer lever assy
AS and hammer
AG.
3) Wear of positioning
plate Al and stick-
ing of foreign matters.
4) Foreign matters
sticking to the print
wheel assy A7 and
hammer A6.
5) Print wheel assy A7
is too weak, and
characters are worm
out.
1) Trigger lever spring
BS is mounted
improperty.
2) Setecting ratchet
spring A18 is too
weak or disengaged.
3) Hammer spring of
the hammer
transfer lever assy
A5 is too weak.
4) Faulty operation of
print wheel assy
A?7.
5) improper adjustment
of detection wheel
Ci.
6) Bending of the
brush of detector
assy C2.
© Check if the platen assy A17 is
perly set to the frame.
@ Visually check the stroke of
hammer A6 by putting the
trigger lever B4 into sucking
state by hand.
© Check the wear of the tooth of
positioning plate Al for
advancing column as weil as
the sticking of foreign matters.
@ Visually check the hammer tip
and the front and back surfaces
of print wheel.
@ Visually check the frame of
print wheel and the characters
of the same.
© Visually check from the bottom
of the printer.
© Visually check from the top of
the printer.
@ Return the print wheel assy
A7 and carriage A4 to the
waiting position. Then, slide
the carriage by hand after the
Positioning plate A1 is released,
and check if the print wheel
slides smoothly.
@ Check.
@ Check the bending of the brush.
~ 21 _
@ Modify the mounting position,
@ Replace the worm parts.
@ Replace the positioning plate
Al,
@ Remove the foreign matters.
© Remove the foreign matters.
© Replace the print wheel assy
A7.
@ Modify the mounting position,
© Replace the selecting ratchet
spring A18.
© Replace the hammer transfer
lever assy A5.
@ Replace the print wheel assy
A7.
@ Adjust the detection wheel
C1.
© Replace the detector assy
C2.

REPAIR
NATURE OF CONDITION OF
TROUBLE
TROUBLE
POSSIBLE
CAUSE
Seon
CHECK
POINT
.
REMEDY
4.
Omission
of
7)
Trigger
plate
812
@
Check
if
the
foreign
matters
©
Remove
the
foreign
matters.
character
and
trigger
yoke
of
stick
to
them.
:
selecting
gear
assy
5.
Erroneous
B14
are
clogged
printing
with
foreign
matters.
8)
Trigger
plate
812
®@
Check
if
they
are
scratched
or
©
Replace
the
trigger
plate
B12
and
trigger
yoke
of
burred.
and
selecting
gear
assy
B14.
the salecting
gear
assy
B14
are
scratcned
or
burred.
9)
Carriage
feeding
gear
©
Modify
the
mounting
position.
A16
is
mounted
improperty.
10) Maulty column ad- e@ Refer to Nature of Troubie 9.
vancing.
11) Faulty retuming. pa @ Refer to Nature of Trouble 10,
6.
Printed
Char}
Printed
charac-
|
1)
Ink
roller
assy
is
e@
Check.
@
Modify
the
mounting
position.
acters
are
ters
are
stained
mounted
impro-
stained
or
or
indistinct.
Perly.
indistinct.
12)
Use
of
improper
A
©
Check
if
the
specified
ink
rolier
|
¢
Replace
it
with
the
specified
ink
ink
roller
assy.
assy
is
used.
—
Standard:
Refer
roller
assy.
to
1.2-9.
3)
Ink
roller
spring
A14
@
Remove
the
ink
roller
assy
and
|
©
Replace
the
ink
roiler
spring
is
too
weak.
visually
check.
Al4,
4)
Exhaust
of
ink
for
A
®
Check
the
ink
roller
for
remain-
|
@
Replace
ink
roller
assy.
ink
rofler
assy.
ing
quantity
of
ink.
5) Wear of print cam © Refer to Cause 2) of Nature of
A12, hammer Trouble 3.
transfer lever assy
A5 and hammer
AG.
6)
Print
wheel
assy
A7
@
Check
if
they
are
clogged
with
|
@
Remove
the
foreign
matters.
and
piaten
assy
A17
ink
or
paper
particles.
are
clogged
with
foreign
matters.
7)
Bending
of
the
paper
©
Visually
check
from
the
top
of
|
@
Modify
the
shape
of
ear
portion
guide
ear
portion
of
the
printer.
or
replace
the
platen
assy
A\17.
platen
assy
A17
(metal
portion
at
the
outlet).
7.
Paper
feed-
Motor
runs
nor-
|
1)
Jumper
wire
C3
is
@
Refer
to
Cause
1)
of
Nature
of
ing
is
im-
imally,
but
the
not
conducting.
Trouble
1.
possi
bie.
iPaper
cannot
be
coil assy B13 is ' Troubie 2.
broken. |
3)
Heating
elements
©
Refer
to
Cause
6)
of
Nature
of
©
are
not
energized.
Trouble
2.
:
{input
pulse
is
not
applied
properly
for
the
trigger
coil
assy
B13).
a
|
2)
Coil
of
the
trigger
e
Refer
to
Cause
2)
of
Nature
of
|
i
-22-

NATURE OF
TROUBLE
7. Paper feed-
ing is im-
possible.
. Paper feed-
ing does
not occur
at specifi-
ed pitch.
9. Improper
column
advancing.
CONDITION OF
TROUBLE
Characters are
Not printed at
regular line
pitch.
Carriage A4
does not carry
column,
POSSIBLE CAUSE
4) Paper guide of pla
ten assy Al7 is
clogged with foreign
matters.
5) Scratch or-wear of
paper feeding gear
train.
1) Use of improper
paper.
2) Platen assy A17 is
mounted impro-
perly.
3} Faulty platen assy
Al?7.
4) Faulty paper feed-
ing drive gear assy
B1.
5) Scratch or wear of
paper feeding gear
train.
6) Improper supply of
paper.
1) Wear of trigger fever
B4.
2) Wear of selecting
ratchet 86.
REPAIR
CLASSI-
FICATION
CHECK POINT
© Check the travelling route of
the paper guide.
@Purt the trigger lever 84 into
sucking state by hand, and
visually check the gear train,
while paper feeding operation
is being performed.
@ Paper feeding ratchet wheel
All,
© Paper feeding drive gear assy
Bt.
® Paper feeding transmission gear
B2
®@ Paper feeding gear.
(inculded in the piaten assy
A117).
@ Check if the specified paper is
used. - Standard: Refer to
1,2-7,
@ Refer to Cause 1) of Nature of
Trouble 3.
@ Check if the paper feeding
rubber is worn out or it is
slippery because of sticking of
foreign matters.
© Check if the inside spring is
broken.
© Refer to Cause 5) of Nature of
Trouble 7.
@ Check if the paper supply is
performed properly.
®@ Check the wear (at the portion
where the lever is engaged with
selecting ratchet B6).
@ Check the wear.
= 23 =
REMEDY
e@ Remove the foreign matters.
© Replace the faulty parts.
© Replace it with the specified
paper.
@ Roughen the surface of the
paper feeding rubber using
sand paper or replace the
platen assy A17.
@ Replace the paper feeding
drive gear assy B1.
© Modify the improper paper
supply.
© Reptiace the trigger lever B4.
@ Replace the selecting ratche!
BE.