Sharp EL-2901E, EL-2192P, EL-2901C Service Manual

MODEL

EL-2901E
EL-2901C
EL-2192P

KEY LAYOUT

KEY SYSTEM : Plastic key + Key rubber

STANDARD FUNCTION

ELEMENT :
NUMERAL :

LCD
12

PARTS NAME :
SYMBOL :digits digit(s)2

Name

(mm)

Type
Pin:: 76 pins

: CHIP

u3866-015H

POWER SUPPLY

AC : O DC : X

AC ADAPTER

DIMENSIONS (mm)
CALCULATIONS

RECHARGEABLE BATTERY
POWER CONSUMPTION
AUTO POWER OFF TIME
MEMORY PROTECT

Four arithmetic calculations, Constant calculation,
Power calculation, Reciprocal calculation, Chain
calculation, % calculation, Add-on (discount)
calculation,memory calculation, adding mode, etc.

L
S

I

D

I
S
P
L
A
Y

S
E

C

T

I

O
N

200 (D) x 251(W) x 60 (H) mm

12 digits 1M

P
R

I
N
T
E
R

S
E
C
T

I
O
N

MODEL NAME
PRINTING SYSTEM
PRINTING CAPACITY
CHARACTER DIMENSION
INPUT BUFFER
PRINTING SPEED
PAPER FEED SPEED
PAPER RELEASE MECHANISM
INK RIBBON
INK ROLLER
PAPER
PAPER SIZE (Roll Paper)

MFL87 (KI-OB1078CCZZ)
Serial print system

19 digits

1.6(W)

3.5 (H)

mm

12 stages
Approx. 2.6 lines / sec.
Approx. 8.5 lines / sec.

Yes

Plain paper

58 mm (W), 80mm in diameter (max.)
(DPAPR1004CSZZ...5 rolls / pack)

+0

-1

BA TTER Y TYPE

Yes* (TAX / EURO only)

1

NOTE) *1 : This calculator operates only on AC power.

Further, the memory is retained only while the
AC cord is plugged in and clears when the AC
cord is disconnected.

30mA : AAC, ABC, AC7, TLC

5.2W, 47mA : UIC

AC only

CHARACTER PITCH : 9.0mm

9060ATRH

Black : EA-781R-BK, Red : EA-781R-RD

Parts marked with " " i s impor tant for maintain ing the safety o f the set. Be sure to r eplace these par ts with specified
ones for maintaining the safety and performance of the set.

SHARP CORPORATION

This document has been published to be used
for after sales service only.
The contents are subject to change without notice.

TAX+TAX-

for SEEG :

100

ON

OFF ·

P P·IC

5/4

↓

210

A

÷

×

=

C/CE

000

123

456

789

−

+

∗

M

∗

MU

%

M

−

M

+

M

◊

#/◊

TAX-

TAX+

STR

GT

F

3

GT ·

M

EG

18.75

6.9

M

EG

SERVICE MANUAL

1. Block diagram

2. Tax/Euro exchange functions

LSI used for this machine has a tax function and a EURO exchange
function. Either f unction is selected depending on the d estination of the
product.

Model name

SPEC
CODE

Tax

function

EURO

exchange

function

Country

EL-2192P U1C O SECL
EL-2901E AC7 O SEEG

EL-2901C

AAC /
ABC /

TLC

O SUK, SCA, Agent

<Selecting between Tax/EURO exchange functions>
Either of the Tax and Euro exchange functions can be selected by

changing the signal with the j ump er cables on the KEY PWB.
<Backup of Tax/EURO exchange functions>
This machine is an AC type which retains Tax data (tax rates and

others) and EURO exchange data in memory only while the AC co rd is
plugged in. Therefore, data in memory cannot be retained if the AC
cord is disconnected.

3. PTMFL87 PRINTER CAUTION NOTES

3-1. Servicing

The printer model PTMFL87 (Ki-OB1078C CZZ) used for the EL-2192P
/ EL-2901C / 2901E is available for service by an entire unit and
therefore none of individual service part s is available for supply .

3-2. Cautions for handling

(1) Cautions for holding

Hold the sections shown with the arrows to carry the printer.

(2) Sections which a force must not be applied to :

1) PWB A

2) Do not turn the front belt B manual ly.

3) Do not turn the pulley C manually.

4) Do not apply a force t o the hammer holder D.

(3) Sections which must not be touched :

1) Do not touch th e shaft E with a bare hand.

2) Do not touch th e font belt B with a bare hand.

3-3. Detecting Mechanism

The detector is of mechanical contact type and consists of the code
plate to output the character position detection signal to correspond to
each charac ter on the character belt , sensor gear unit to output th e
standard position si gnal, and fixed cont act-piece unit.

: Power supply line
: Signal line

AC input

LSI

LCD

Driver

Key,SL-SW

Printer

Power supply
circuit

D

C

BE

A

SCRSD

Code plate

Sensor gear unit

Fixed contact-piece unit

Fig. 1 Detecting Mechanism Fig. 2 Equivalent Circuit

S74S0S1

CP73 CP74 CP0 CP1

Standard signal(SD)

Reset signal( R)

Character position
signal(CP)

Standdard position
signal(SP)

Set signal(S)

Fig. 3 Time Chart

The charact er pos it ion d ete ct ing s ign al (CP) i s to b e ma de by th e u ser
from the leading edges of the set signal and reset signal. This CP
corresponds to the character on the character belt. The standard sig­nal (SD) i s a signal output onc e to the 75C P pulse, an d the signal t o
be made by the user utilizing the leading edge of the second CP from
the leading edge of thi s signal is the standard position si gnal (SP).

The reason w hy CP and SP are made using the raw signals output
from the detector is that the effect of chattering is taken into considera­tion.

The following will explain the basic operation.

3-4. Operation Sequence

The basic operati on is explained

(1) Initialization

In order to make sure that the hammer holder is at its home position,
i.e. the first column, print the space after power is turned on, and after
the carry / return, do one-line paper feeding and set the hammer
holder at its home position. This comple t es the initialization.

(2) 1-line printing operation

1) The printing operation is started by setting the motor driving signal
(MT) ON.

2) Prior to 1-line printing, detect the standard position signal (SP)
once and make the time from the leading edge of the character
position detection signal CP8 to the leading edge of CP9 to and
make it standard pulse width. (This to setting must be done at the
initialization and prior to the 1-line printing. to is utilized for error
detection.)

3) The character belt rotates until the de sired CP pulse is detected.

4) If the desired CP pulse is detected, power is supplied to the elec­tromagnetic clutch unit, the character belt is stopped, and printing
operation / carry operation are done. In the meantime, the power to
the electromagnetic unit is cut off. (For the detail, see 1 .3.2.Printin g
/ Carry Mechanism.)

5) After completion of the printing / carry operation, the character belt
rotates again.

6) The operations 3) through 5) are repeated and 1-line printing is
completed.

7) After the most signif icant digit printing, the el ectromagne tic clutch­signal TM becomes OFF, and then between T3 and T4, paper
feeding / column return operation is done by turning the electro­magnetic clutch ON again.

T3 = 80 to 200

m sec

T4 = (2.0 ~ 2.4) x Tcp

8) After paper feeding is started, it is completed when about 19CP is

counted.

9) The motor driving signal is turned OFF after 19CP counting after
the paper feed ing is starte d. In case SP is not found withi n 19CP
after the paper feeding is started, it is turned OFF after SP is
detected.

Fig. 5 Time Chart for 1-Line Printing (0.

|

___

| * printing)

(3) Continuous printing operation

1) After the 1-line printing operation in (2), the motor driving signal
(MT) is not turned OFF and the operations 2) through 8) are con­tinuously done for the necessary number of columns while the
motor is run.

2) After the most significant digit of the last line is printed, the opera­tions 7), 8) and 9) in (2 ) are done and the motor is stopped.

(4) Paper feeding operation

For the paper feeding operation, 1-line printing of space may be done
in the same way as for t he printing operation sequence.

3-5. Troubleshooting dislocated print belt

Install the character belt on the drive pulley and driven pulley. When
installing the character belt, the f ollowing points must be considered.

1) If the driven pulley is removed and mismatched with the CC cam, it
should be aligned as follows.

2) The character belt should be positioned as follows.
Manually t urn the motor to the po sition where the SD p ulse ap-

pears.

089 21 0

Motor driving signal(MT)

Standard pisition
detection signal(SP)

Character position
detection signal(CP)

Electromagnetic
clutch signal(TM)

Carry gear operation

Paper reeding operation

Rack operation

Hammer operation

Carry operation

Fig. 4 Time Chart at Initialization

089 17 232528 0

16 22 24 27

19CP(mim)

T4

T3

t0

0. *

Motor driving signal(MT)

Standard pisition
detection signal(SP)

Character position
detection signal(CP)

Electromagnetic
clutch signal(TM)

Carry gear operation

Paper reeding operation

Rack operation

Hammer operation

Carry operation

Printing pattern through
the adove operation

Boss of
frame

Hole

Driven pulley

Frame hole
(Driven hole
inserting part)

CC cam

· A. Drive pulley side

Adjust the "–" of the character belt to the position of the hole (mark).
("–" shown in the abo v e arrangement of charac t ers)

· B. Driven pulley side

Adjust the center of the space of the c haracter belt to the position of
hole (mark).

4. Note for disassembly and assembly

4-1. Disassembly of upper / lower cabinets

1) Hold the bottom housing and push down the upper housing at
circled 1 and slide the upper housing outwards.

2) Do the same at circled 2 and then 3.

4-2. Tightening torgue value

1) Key PWB : 1.5 0.2kg

2) Lower case : 2.5

0.5kg

Cutout

Driven pulley

Hole(mark)

1

2

3

1

2

2

4

5

6

3

1

2

4

5

6

3

UPPER CASE

UPPER CASE

LOWER CASE

3 x 8

List of destinations (Destinations are determined
by the name plate voltage and the plug shape. )

Destination

To identify destination

Major shipping country Remarks

Name plate voltage Plug shape No.
U1C 120V 60Hz 1 Canada
AAC 220-230V 50Hz 2 U. Kingdom
ABC 230-240V 50Hz 3 Austraria

AC7, TLC 220-230 50Hz 4 Germany, Agent

AC cord

NO. PARTS CODE

PRICE

RANK

TYPE OF LEAD

DESCRIPTION

MODEL NAME

2 LEAD 3 LEAD EL-2901C EL-2901E EL-2192P

1

AP O AC cord U1C O

2

AZ O AC cord AAC O

3

AS O AC cord ABC O

4

AP O AC cord AC7, TLC O O

Plug shape

0GS5420150////

(U1C)

12

34

(AAC)

(ABC)

(AC7,TLC)

0GS5420220////

0GS5420170//// 0GS5420160////

LCD unit

The S/L switch uses a key sheet (carbon printed)

Silver foil

Carbon printed

(Resistance: below 300

Ω

8 7 6 5 4

3

2 1

A

B

C

D

12345678

D

C

B

A

5. CIRCUIT DIAGRAM

6. PWB LAYOUT

(1) MAIN PWB

(2) KEY PWB

(2) KEY PWB

(OPEN) TAX specifications
(SHORT) EURO specifications

■ Parts guide

1Exteriors

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PART
RANK

DESCRIPTION

1

0GS6177490//// AG

C Paper cutter

2

0GS6345100//// AF

D Paper holder

3

0GS6143250//// AS

N D Display window (EL-2192P) [EL-2192P]

0GS6143260//// AS

N D Display window (EL-2901E) [EL-2901E]

0GS6143270//// AS

N D Display window (EL-2901C) [EL-2901C:AAC,ABC,TLC]

4

0GS6177860E/// AD

N C Key top (HALF)(3KEY)

5

0GS6177860B/// AE

N C Key top (MEMORY)(5KEY)

6

0GS6177860D/// AG

N C Key top (FUNCTION)(9KEYS)

7

0GS6177860F/// AD

N C Key top (TAX)(2KEY) [EL-2192P,EL-2901C]

0GS6177870F/// AD

N C Key top (EURO)(2KEY) [EL-2901E]

8

0GS6177500A/// AH

C Key top (NUMBER)

9

0GS6177500C/// AC

C Key top (-)

10

0GS6177500G/// AC

C Key top (+)

11

0GS6345120//// AC

C Key top bar

12

0GS6116720//// AU

N D Upper case

13

0GS6177540//// AD

C SL-SW arm

14

0GS6177850//// AC

N C SL-SW mask-L (BLINDER)

15

0GS6177840//// AC

N C SL-SW knob-L

16

0GS6177521//// AC

N C SL-SW mask-S (BLINDER)

17

0GS6177511//// AC

N C SL-SW knob-S

18

0GS6345110//// AC

C SL-SW contact

19

0GS6314420//// AF

N C SL-SW sheet (SPACER)

20

0GS5533350//// AP

N C Key rubber

21

XUBSD26P05000 AA

C Screw (2.6´5) [for PWB,P/H]

22

KI-OB1078CCZZ BC

E Printer unit (MFL87)

23

0GS5110270//// AD

N C Flat cable (P/H,M/B)

24

0GS6314430//// AD

N D Back-up tape (FOR H/SEAL)

25

0GS2192LCD//// AY

N E LCD unit (LCD + H.M.F)

26

0GS6314470//// AE

N C Insulation sheet (45´40´0.1)(FOR FLAT CABLE)

27

0GS5110260//// AF

N C Flat cable (M/B,K/B)

28

0GS2192PWB//// BF

N E PWB unit (PWB + LCD + H.M.F)

29

! 0GS3120060//// AX

N B Transformer (120V)(for CANADA) [EL-2192P]

! 0GS3120070//// AZ

N B Transformer (220-230V) [EL-2901E,EL-2901C:AAC,TLC]

! 0GS3120080//// AZ

N B Transformer (230-240V)(for AUSTRALIA) [EL-2901C:ABC]

30

0GS6314250//// AD

C LCD cushion

31

0GS6126550//// AU

N D Lower case

32

XUPSN30P08000 AA

CScrew (3´8) [for CABINET]

33

0GS6322000//// AC

D Foot rubber

34

! 0GS5420150//// AP

N B AC cord (for CANADA) [EL-2192P]

! 0GS5420160//// AP

N B AC cord (for SEEG) [EL-2901C:AC7,TLC]

! 0GS5420220//// AZ

N B AC cord (for ENGLAND) [EL-2901C:AAC]

! 0GS5420170//// AS

N B AC cord (for AUSTRALIA) [EL-2901C:ABC]

35

PTUBU1004CCZZ AA

C Protection tube (M4)

36

0GS9432130//// AD

N D Rating label [EL-2192P]

0GS9432170//// AD

N D Rating label [EL-2901E]

0GS9432140//// AD

N D Rating label [EL-2901C:AAC]

0GS9432150//// AD

N D Rating label [EL-2901C:ABC]

0GS9432160//// AD

N D Rating label [EL-2901C:TLC]

EL-2901E/C

EL-2192P

– 1 –

1Exteriors

CCP00076

1

3

2

4

5

6

7

9

10

6

5

8

12

13

14

13

15
18

17

19

16
17

18

20

21

21

21

21

21

21

21

22

23

25

26

21

27

21

21

24

28

21

29

35

34

30

30

31

32

33

33

32

32

32

36

11

EL-2901E/C

EL-2192P

– 2 –

2 Accessories

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PART

RANK

DESCRIPTION

1

0GS9208860//// AD

D Manual(E/F/S) [EL-2192P]

0GS9208920//// AP

N D MANUALManual [EL-2901E]

0GS9208910//// AD

N D Manual(E/F/S) [EL-2901C]

2

0GS9464640//// AC

C Important label [EL-2901C:AAC]

3 PWB unit

NO. PARTS CODE

PRICE

RANK

NEW

MARK

PART

RANK

DESCRIPTION

1

VRD-HT2EY822J AA

C Resistor (1/4W 8.2KW ±5%) [R1]

2

VRD-HT2EY104G AA

C Resistor (1/4W 100KW ±2%) [R2]

3

VRD-HT2EY204J AA

C Resistor (1/4W 200KW ±5%) [R3]

4

VRD-HT2EY244J AA

C Resistor (1/4W 240KW ±5%) [R4,R5,R6]

5

VRD-HT2EY122J AA

C Resistor (1/4W 1.2KW ±5%) [R7]

6

VRD-HT2EY563J AA

C Resistor (1/4W 56KW ±5%) [R8,R10]

7

VRD-HT2EY102J AA

C Resistor (1/4W 1.0KW ±5%) [R9]

8

VRD-HT2EY205G

N C Resistor (1/4W 2MW ±2%) [R11]

9

VRD-HT2EY133J AA

C Resistor (1/4W 13KW ±5%) [R12]

10

VRD-HT2HY331J AA

C Resistor (1/2W 330W ±5%) [R13]

11

VRD-HT2HY820J AA

C Resistor (1/2W 82W ±5%) [R14]

12

VRD-HT2HY511J AA

C Resistor (1/2W 510W ±5%) [R15]

13

VRD-HT2EY823J AA

C Resistor (1/4W 82KW ±5%) [R16]

14

RMPTC5823QCKB AB

B Block resistor (82KWX5 1/8W ±10%) [RP1,RP2]

15

VCEAGU1CW228M AE

C Capacitor (16WV 2200mF) [C1]

16

VCEAGU1CW227M AB

C Capacitor (16WV 220mF) [C2]

17

VCEAGU1HW105M AA

C Capacitor (50WV 1mF) [C4]

18

VCKYPU1HB102K AA

C Capacitor (50WV 0.001mF) [C5,C6,C7]

19

VCKYPU1HB103K AA

C Capacitor (50WV 0.01mF) [C8,C9]

20

VCTYPU1EX104M AB

C Capacitor (25WV 0.1mF) [C10]

21

VS2SC1815-GRC AB

B Transistor (2SC1815-GRC) [Q1]

22

VS2SC3068-/-1 AD

B Transistor (2SC3068) [Q2]

23

VS2SC3070-/-1 AE

B Transistor (2SC3070) [Q3]

24

VHEHZ6B1L//-1 AA

B Zener diode (HZ6BL1) [ZD1]

25

VHD10E1N///-1 AB

B Diode (10E1N) [D1,D2,D3,D4]

26

VHDDSS131//-1 AA

B Diode (DSS131) [D5,D6,D9,D10]

27

! 0GS3610330//// AE

A Fuse (250V/750mA) (EL-2192P)[F1]

28

! 0GS3610350//// AF

N A Fuse (250V/800mA) (EL-2901E/C)[F1]

101

0GS2192LCD//// AY

N E LCD unit (LCD + H.M.F)

102

KI-OB1078CCZZ BC

E Printer unit (MFL87)

(Unit)

901

0GS2192PWB//// BF

N E PWB unit (PWB + LCD + H.M.F)

EL-2901E/C

EL-2192P

– 3 –

COPYRIGHT ã 1999 BY SHARP CORPORATION

All rights reserved.

Printed in Japan.

No part of this publication may be reproduced,

stored in a retrieval system, or transmitted.

In any form or by any means,

electronic, mechanical, photocopying, recording, or otherwise,

without prior written permission of the publisher.

SHARP CORPORATION
Information Systems Group
Quality & Reliability Control Center
Yamatokoriyama, Nara 639-1186, Japan

1999 July Printed in Japan