Casio CE-235 Service Manual

SERVICE MANUAL

ELECTRONIC CASH REGISTER

CE-2350 (EX-259)

JAN. 1995

CONTENTS

1. FEATURES.............................................................................................................. 1

2. SPECIFICATION .................................................................................................... 1

3. MAC (Memory All Clear) OPERATION .............................................................. 2

4. DIAGNOSTIC OPERATION ................................................................................ 3

4-1. How to start .................................................................................................. 3

4-2. Mode switch and PAD status display check .................................................... 4

4-3. Hard key code check .................................................................................... 4

4-4. Hard check function ..................................................................................... 5

5. OPTION CIRCUT ................................................................................................... 8

6. CIRCUIT EXPLANATION ..................................................................................... 9

6-1. Power supply circuit ...................................................................................... 9

6-2. CPU ............................................................................................................. 11

6-3. Motor error detection circuit .......................................................................... 12

6-4. Mode key switch status read ......................................................................... 13

6-5. RAM address / head drive signal switching circuit ............................................ 13

6-6. Initilize IC (Reset IC) ...................................................................................... 14

6-7. Printer error condition of CPU ........................................................................ 14

7.TO OPEN THE UPPER CASE ............................................................................ 15

8. PCB LAYOUT ........................................................................................................ 16

9. CIRCUIT DIAGRAM .............................................................................................. 17

10. PARTS LIST ........................................................................................................ 28

1. FEATURES

The differece between CE-2300 and CE-2350 is as follows;

2. SPECIFICATION

2-1. Electrical specifications

Power consumption :

Specification : 0.35A

In operation Max. 0.22A Stanby Min. 0.09A Power OFF 0.08A

Memory protection

Back-up battery : Mangan battery (UM-3 x 3 pcs.) Back-up period : 1 year (25°C) Battery life : Replace the battery every year.

Clock & Calendar

Accuracy : Within 120 sec. per month (25°C) Auto calendar : Effective until 2099 A.D.

2-2. Environmental specifications

Operating temperature : 0°C ~ 40°C Operating humidity : 10 % ~ 90% Storage temperature : -25°C ~ 65°C Storage humidity : 10% ~ 95% Vibration strength : 1.5G (The machine must be inthe carton box.)

2-3. Principal components

CPU : Name : uPD75516GF-351-3B9

Number of control bit : 4 Internal RAM : 512x 4 bits Internal ROM : 12160 x 8 bits Main system clock : 4.19 MHz Sub system clock : 32.768 Khz

Item CE-2300 CE-2350

Department number 8

19 x 2

(for using DEPT SHFT key) PLU number 200 400 Clerk number 4 10 Post-finalization receipt printing 24 lines 52 lines Total/Change indicators Mounted Nil RAM capacity 8 KBytes 32 KBytes

RAM : Name : LC36256PLL

Capacity : 32 KB

Printer : Name : CR-710-001

Print method : Rubber-type inner-hummer printing system Receipt number : 2 receipt (Receipt & Journal) Print digit : 12 digits

(Numeric : 10 digits, Symbol : 2 digits) Printing speed : Approx. 2.4 lines/sec. MCBF : 1,500,000 lines Paper width : W44.5 ± 0.5 mm Paper diameter : 83 mm or less Paper thickness : 0.06 ~ 0.09 mm Ink roll : IR-93 Ink roll life : 400,000 lines

Display : Name : LED (HDSP-5261)

Number of digit : 8 digits (LED x 4 pcs.)

Power transformer : Name : TE-233-E4D Keyboard : Input system : 2 keys roll over Drawer : Name : DL-2416 (D-15TC-A55SP-1*) M type drawer

for U.S.A.

DL-2351 (D-15TC-A54SP-1*) M type drawer

for Canada

2-3.Option

Wet cover Name : WT-63 Power protection battery : B-6

Drive period : Approx. 3 hours with the following conditions Drive conditions : Processing time : 60 sec./ customer

Quantity of sales : 8 items / customer

Registered amounts : 3 digits / item

Number of customer : 25 persons / hour

Charging time : 8 hours to full charge

3. MAC (Memory All Clear ) OPERATION

Procedure (1) Plug the power cord into an outlet. (2) Pressing the JOURNAL FEED button and turn the mode switch to Z position. (3) Release the JOURNAL FEED button. After few seconds, MAC operation will be

executed.

(4) The following receipt will be issued, if completed.

Note :

1. After initialize operation, the clock counts from 00 : 00 A.M. and also the calendar is started from 00 - 00 - 00.

2. If the memory of RAM is broken, the machine will be initialized after power on.

4. DIAGNOSTIC OPERATION

4-1. How To Start

1) Plug the power cord into an outlet.

2) Execute the MAC operation.

3) Turn the mode switch to "Z" position.

4) Input 99999999 and press the sub total button.

5) Start the diagnostic program and issued following receipt.

Note : If you have done the registration after MAC operation, the Diagnostic program

can not start.

Date Time

Consecutive No.

MAC print

Date

Time

Consecutive No.

Start printing for diagnostic program

4-2. Mode switch and PAD status display check

When the Clear key is pressed or changing the position of mode switch, the machine displays the mode switch position.

Drawer status : 1 : Drawer open

0 : Drawer close

PAD status : PAD 1 PAD 2

0 0 Short Short Canada 0 1 Open Short 1 0 Short Open 1 1 Open Open U.S.

Receipt switch position :

8 Receipt OFF 0 Receipt ON

Mode switch position : 1 : Z

2 : X 4 : REG 8 : RF

4-3. Hard key code check

When all keys except numerical keys, Clear key, RECEIPT FEED key, JOURNAL FEED key are pressed directly, the machine displays the hard key code as shown below.

2 0 1 0 0 0

2 3

Drawer status

PAD status

Receipt SW position Mode SW position

Hard key code

4-4. Hard check function

Enter 1 digit from numeral key and press the sub total button (ST), the following Hard check function will be executed.

(1) 1+ST : Display, RAM, Drawer, Printer check (2) 5+ST : RAM read only check (3) 7+ST : Voltage check of memory back-up battery (4) 8+ST : Print all characters (5) 9+ST : Display the time

4-4-1. Display, RAM, drawer and printer check

Operation : 1 + ST

1) All segments turn on.

8 8 8 8 8. 8. 8. 8.

2) Date and time set Set the following data in the machine automatically. Date : 1st January, 1992

Time : 12:34:00

3) RAM write and read check The machine writes data into RAM and read out the data to compare with written data.

When this check is finished correctly, the machine goes to check No. 4). However, if an error is occurred, the machine sounds an error tone, prints the error receipt, and stops Hard check program.

Error receipt sample " -- -- "

4) Drawer open check Open the drawer.

20 26 32 38 43

Receipt

FEED

Journal

FEED

C 13 14 19 25 31 37 42 47 51 7 8 9 18 24 30 36 41 46 50 4 5 6 17 23 29 35 40 45 49 1 2 3 16 22 28 34 39 44 48 0 10 11 15 21 27 33

5) Printing check Print the following character.

Z 0 0 0 0 0 0 0 0 0 CA CD

6) Receipt issue The following receipt is issued.

7) Test display

7 6 5 4 3 2. 1 0

4-4-2. RAM read only check

Operation :5 + ST Note : Be sure to execute the RAM write and read check (1 + ST) before this check. The machine reads out the data to compare with written data until an error is occurred and

brinks " -- " on the display during this check. To stop this check, turn the mode switch to OFF position. If an error is occurred, the machine sounds an error tone, prints " -- -- " on the receipt, and stops this check.

4-4-3. Voltage check of memory back-up battery

Operation :7 + ST Display the voltage of back-up battery in real time. (Measurement is Volt (V) level.)

To stop this check, turn the mode switch to OFF position.

4-4-4. All characters print check

Operation : 8 + ST

4-4-5. Display the time

Operation : 9 + ST The machine display the time.

To stop this check, press the Clear key. 1 2 -- 3 4 01 The time counts up. If you make following operation, the machine resets the time data and starts again.

Operation : 9 9 + ST

4-4-6. How to release the diagnostic mode

Execute MAC operation.

5. OPTION CIRCUIT

Power protection battery B-6 Power protection battery B-6 os available fro CE-2350.

However, interface circuit is not mounted the machine. When you use the B-6, mount the following parts.

Parts list for interface

Code No. Parts Name Specification Q’ty

2200 3577 Transistor 2SA1015(GR,O,Y) 1 2301 0011 Diode 1S2471 2 2310 3541 Zener diode RD12EB2 1 2600 7313 Carbon film resistor R-25-10K-J 3 2614 0552 Carbon film resistor R-25-2K-J 1 2801 7098 Electrolytic capacitor 50RE2 1 6219 4553 Connector fixing plate E311094-1 1 6236 6180 P1625-06P connector ass’y E314531B-10(#22-200) 1

Pin assignment for B-6 connector

Pin No. Description

1 F.G. (Green) 2 Not used 3 CS (Black) 4 GND (Blue) 5 Not used 6 VP (Brown)

Interface circuit for B-6

6. CIRCUIT EXPLANATION

6-1. Power supply circuit

Q1 : Transistor for controlling voltage (VP) Q2 : Transistor for voltage detection Q3 : Transistor for controlling power down (PWD) signal ZD2 : Zener diode for controlling base current of Q2 ZD3 : Zener diode for detecting power down (PWD) signal

After plug the AC cord into the outlet, the AC voltage (23.8V) appears at CN1 connector. Then this voltage is rectified by the diode brige and it become constant voltage through the capacitor C1.

[Voltage VP]

A constant voltage (31.4V) appears on the “ 2 “ position. This voltage made from the constant voltage circuit consist of transistor Q1 and Q2, zener diode ZD2, resisror R7, R8, R12 and R13.

[Voltage VLED and VCC]

The voltage goes to pin No.1 of regurator IC1 and then it is out from pin No.2 of IC1 as stable voltage (5.6V). Then this voltage down to 5 volts through the diode. It is used for VCC ( for logic) and VLED (for display drive). Also, it goes to pin No.4 of IC1 and using to control the output voltage level. Inductor L1 is used to stabilize the VCC voltage when the drawer opened.

5 7 8 9

[PWD signal]

After plug the AC cord into outlet, VP voltage appears on the base terminal of transistor Q3. When the VP exceeds 16 volts, Q3 is turned on by the differential voltage between base and emitter terminal of transistor Q3. Then the PWD signal goes to GND level and informes “ Power ON “ to the CPU. When the VP drops less than 16 volts, Q3 is turned off. Then the PWD goes high level since the PWD is pulled up to VDD. When the CPU receives “ High “ signal of PWD, CPU goes to “ Power failure process “.

Note : During plug the Ac cord into outlet, all voltages are supplied to the PCB.

If you open the machine for repair, make sure plug off.

[Location for voltage check points]

Actual value on the E259-1 PCB (unitV)

Check point 1 2 3 4 5 6 7 8 9 10 11 12 Power ON 23.8(AC) 31.4 25.2 7.61 24 8.2 8.1 0.6 0 5 5.6 5 Power cord off 0 0 0 0 0 0 0 0 4 0 0 0

6-2. CPU (uPD75516GF-351-3B9)

Pin No. Signal Descriptions In/Out

PW-ON

level

1 AN0 Mode switch signal (RF,OFF,REG,X,Z) signal In 2.0V 2 AVREF VCC terminal (+5V) - 5.0V 3 VDD VDD terminal (+5V) - 5.0V 4 VDD VDD terminal (+5V) - 5.0V 5 P113 Motor drive signal (M4) Out Low 6 P112 Motor drive signal (M3) Out High 7 P111 Motor drive signal (M2) Out Low 8 P110 Motor drive signal (M1) Out Low

9 P103 Stamp / Clock signal Out Low 10 P102 RAM address signal (A12) / Receipt and Journal feed (FEED) Out Low 11 P101 RAM address signal (A09/A11) / Head drive signal (HD6) Out Low 12 P100 RAM address signal (A08/A10) / Head drive signal (HD5) Out Low 13 P93 RAM address signal (A03/A07) / Head drive signal (HD4) Out Low 14 P92 RAM address signal (A02/A06) / Head drive signal (HD3) Out Low 15 P91 RAM address signal (A01/A05) / Head drive signal (HD2) Out Low 16 P90 RAM address signal (A00/A04) / Head drive signal (HD1) Out Low 17 SI1/P83 Key input signal (Ki7) In High 18 SO1/P82 Key input signal (Ki6) In High 19 SCK1/P81 Key input signal (Ki5) In High 20 PP0/P80 Key input signal (Ki4) In High 21 KR7/P73 Not used Out 22 KR6/P72 Display segment signal (SG1) Out Pulse 23 KR5/P71 Display segment signal (SF1) Out Pulse 24 KR4/P70 Display segment signal (SE1) Out Pulse 25 KR3/P63 Display segment signal (SD1) Out Pulse 26 KR2/P62 Display segment signal (SC1) Out Pulse 27 KR1/P61 Display segment signal (SB1) Out Pulse 28 KR0/P60 Display segment signal (SA1) Out Pulse 29 P53 Display segment signal (SDP0) Out Pulse 30 P52 Display segment signal (SG0) Out Pulse 31 P51 Display segment signal (SF0) Out Pulse 32 P50 Display segment signal (SE0) Out Pulse 33 VSS GND terminal 34 P43 Display segment signal (SD0) Out Pulse 35 P42 Display segment signal (SC0) Out Pulse 36 P41 Display segment signal (SB0) Out Pulse 37 P40 Display segment signal (SA0) Out Pulse 38 P33 Display segment coomon signal (Dg4) Out Pulse 39 P32 Display segment coomon signal (Dg3) Out Pulse 40 P31 Display segment coomon signal (Dg2) Out Pulse 41 P30 Display segment coomon signal (Dg1) Out Pulse 42 P23/BUZ Buzzer signal Out Low 43 P22/PCL Motor drive signal (for paper feeding) Out Low 44 P21 Step motor common signal (for print wheel) Out High 45 P20/PT00 Drawer open signal (DW) Out Low 46 P13/TI0 Key input signal (Ki9) In High 47 P12/INT2 Key input signal (Ki8) In High 48 P11/INT1 Power down signal In Low 49 P10/INT0 Reset pulse from printer In High 50 P03/SI0/SB1 Key input signal (Ki3) In High

Note : The “PW-ON level” is measured under following conditions.

1) Mode switch is REG position.

2) The display is the time.

3) Receipt switch is ON position.

4) PAD1 and Pad2 are both open.

Pin No. Signal Descriptions In/Out

PW-ON

level

51 P02/SO0/SB0 Key input signal (Ki2) In High 52 P01/SCK0_ Key input signal (Ki1) In High 53 P00/INT4 Key input signal (Ki0) In High 54 VSS GND terminal 55 XT1 Sub system clock signal (32.768KHz) In Pulse 56 XT2 Sub system clock signal (32.768KHz) In Pulse 57 IC GND terminal 58 X1 Main system clock signal (4.19MHz) In Pulse 59 X2 Main system clock signal (4.19MHz) In Pulse 60 RESET_ Initilize signal In High 61 P143 RAM write enable signal (WE_) Out High 62 P142 RAM chip enable signal (CE_) Out High 63 P141 Journal feed common signal Out Low 64 P140 Receipt feed common signal Out Low 65 P133 RAM data signal (D3) In/Out High 66 P132 RAM data signal (D2) In/Out High 67 P131 RAM data signal (D1) In/Out High 68 P130 RAM data signal (D0) In/Out High 69 P123 Key common signal (Kc02) Out Pulse 70 P122 Key common signal (Kc01) Out Pulse 71 P121 Key common signal (Kc00) Out Pulse 72 P120 RAM address signal (A14) Out Low 73 AVSS GND terminal 74 P153/AN7 Receipt ON/OFF signal In High 75 P152/AN6 Motor error signal In Low 76 P151/AN5 Pad data signal (PAD2) In High 77 P150/AN4 Pad data signal (PAD1) In High 78 AN3 GND terminal 79 AN2 Battery voltage detection terminal In 0~4.5V 80 AN1 Drawer sensor signal In Low

6-3. Motor error detection circuit

When the CPU output motor signal, transistor Q8 becomes on and the voltage level at “A” point becomes GND. Then, paper feeding motor rotate. Normally, pin No.1 of IC4 appears low signal. IC4 detects differential voltage between pin No.2 and 3. In case pin No.3 is higher than No.2, output(Pin No.1) signal is hogh. If motor happens over load ( Paper jam etc.), over load current (250mA) runs resistor R9. So, “A” point voltage lebel becomes high. Then IC4 outputs high signal and then CPU knows motor error occured. When the CPU receives “Motor error signal”, CPU stops motor signal.

6-4. Mode key switch status read

The CPU knows the mode switch status by voltage level of pin No.1. the voltage level is down by resistor. Each voltage is as shown below.

To Printer

To CPU

Mode REG X Z RF OFF Voltage (V 196 3.29 4.36 0.98 0

REG

16Kohms

6.2Kohms

2Kohms

560 ohms

To Pin No.1 of CPU

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Casio CE-235 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual