CASIO CE300 Service Manual

SERVICE MANUAL

(without price)

ELECTRONIC CASH REGISTER

CE-300 (EX-247)

JANUARY 1997

Printer Model : MD-910

Page

1. SPECIFICATIONS ................................................................................................ 1

2. INITIALIZE (MAC) OPERATION .......................................................................... 1

3. BLOCK DIAGRAM

3-1. PCB connection ......................................................................................... 2

3-2. Block diagram (circuit) .............................................................................. 3

4. CIRCUIT EXPLANATION

4-1. Power supply circuit.................................................................................. 4

4-2. CPU (uPD78052GC-093-3B9) .................................................................... 5

4-3. Display controller (uPD16312GB-3B4)..................................................... 7

4-4. Initialize IC (Reset circuit) ......................................................................... 8

4-5. Power down detection circuit (PWD) ....................................................... 8

4-6. Address latch circuit ................................................................................. 8

4-7. RAM / ROM bank selection circuit............................................................ 9

4-8. Head drive circuit for printer................................................................... 10

4-9. Vpp sensor circuit.................................................................................... 11

4-10. Power supply circuit for display............................................................. 11

5. DIAGNOSTIC

5-1. To start the diagnostic program............................................................. 12

5-2. Check item................................................................................................ 12

5-3. Operation of each test ............................................................................. 12

5-4. To exit the diagnostic test....................................................................... 17

6. ERROR CODE

6-1. Operation error code ............................................................................... 18

6-2. System lock code..................................................................................... 19

7. IC DATA

1. TC74HC00AP ............................................................................................ 20

2. TC74HC08AP ............................................................................................ 20

3. TC74HC138 ............................................................................................... 20

4. TC74HC367AP .......................................................................................... 21

5. TL431CLPB............................................................................................... 21

6. TC74HC373AP .......................................................................................... 21

7. S-80745 / S-80719..................................................................................... 22

8. M5237L...................................................................................................... 22

9. MAX232 ..................................................................................................... 22

8. PCB LAYOUT ..................................................................................................... 23

9. CIRCUIT DIAGRAMS ......................................................................................... 25

10. PARTS LIST ....................................................................................................... 41

1. SPECIFICATIONS

Power consumption 120 V 220 V 230 V 240 V

In operation Max. 0.28 A 0.17 A 0.16 A 0.15 A

Stand by 0.14 A 0.09 A 0.08 A 0.07 A

Mode SW OFF Max. 0.12 A 0.08 A 0.07 A 0.06 A

Memory protection Backup battery Mangan Battery

UM-3 × 3 pcs. Backup period 1 year (25 °C) Battery life Replace the battery every 1 year.

Memory capacity 32 KB CXK58257AP-70/10L Clock and calender Accuracy Within ±30 sec. per month (25 °C)

Auto calender Effective until 2099 A.D.

Environment Operating temperature 0 °C~40°C

Operating humidity 10 % ~ 90 % Storage temperature -25 °C~65°C Storage humidity 10 % ~ 95 %

Printer Model MD-910-SSC

Print method Dot matrix printing Print digits 24 digits MCBF 1,500,000 lines

Ink cassette Life 250,000 characters Roll paper Type Fine-quality paper or Pressure-sensitive copy paper

Size 57.5 ±0.5 mm Roll diameter 83 mm or less

2. INITIALIZE (MAC) OPERATION

1. Set the mode switch to “OFF” position.

2. Pressing the “FEED” button and turn the mode switch to “PRG” position.

3. Release the “FEED” button.

4. Press “#2” key (Normally “SUB TOTAL” key).

5. Initialize operation is executed.

— 1 —

3. BLOCK DIAGRAM

3-1. PCB connection

Printer

(MD910SSC)

Mangan Battery (UM-3 × 3)

Winder Motor

E247-CNB

17P

Drawer

CORE 2 turn

10P

CN7 CN6

CN4

CN13

CN14

CN2

Fuse

E247-1

Transformer

CN3

24P

Rear Display (SH1019A)

12P10P

Main Display (SH101MA)

E278-E2-2

E278-E2-1

(RS232C) CN17

FPC

CN16

25P

Mode SW

E266-E3-1

— 2 —

3-2. Block diagram (circuit)

Reset circuit

Printer MD-910

S80719AN

Head drive cuicuit

HD.A~HD.H

CUSTOMER DISPLAY

SH1019A

MAIN DISPLAY

SH101MA

Segment & Digit data

PWD detection

CPU uPD78052GC-093-3B9

AD0~AD7

ROM

A8~A15

A0~A7

DI,DO,CLK,STB

uPD16312GB3B4

Select addess

AD0~AD5

DRWS

KC0~KC4

Keyboard FPC

Mode Key

RS232C circuit

RAM

— 3 —

4. CIRCUIT EXPLANATION

4-1. Power supply circuit

Q1: Power transistor Q2: Voltage detection transistor

Voltage level at above check point (unit: V )

Measurement position

ABCD

Voltage (V) 12.5V 5.3V 6.2V 2.47V

— 4 —

4-2. CPU (uPD78052GC-093-3B9)

Pin No. Signal Description In/Out

1 FB3 Not used — — — 2 FB4 RAM bank 3 Out High High 3 FB5 RAM bank 4 Out High High 4 AVSS GND — GND GND 5 PGM Not used — — — 6 RAM Chip select signal for RAM Out High Low 7 AVREF VDD — 5 V 5 V 8 RXD Receive data In High High

9 TXD Send data Ou t High High 10 WD Winder motor drive signal Out Low Low 11 DI Data signal from uPD16312 In Pulse High 12 DO Data signal to uPD16312 Out Pulse High 13 CLK Clock signal for uPD16312 Out Pulse High 14 STB Data strobe signal for uPD16312 Out Pulse High 15 KC0 Key common signal (KC0) Out Pulse High 16 KC1 Key common signal (KC1) Out Pulse High 17 KC2 Key common signal (KC2) Out Pulse High 18 KC3 Key common signal (KC3) Out Pulse High 19 AD0 Address / Data signal (AD0) In/Out Pulse High 20 AD1 Address / Data signal (AD1) In/Out Pulse High 21 AD2 Address / Data signal (AD2) In/Out Pulse High 22 AD3 Address / Data signal (AD3) In/Out Pulse High 23 AD4 Address / Data signal (AD4) In/Out Pulse High 24 AD5 Address / Data signal (AD5) In/Out Pulse High 25 AD6 Address / Data signal (AD6) In/Out Pulse High 26 AD7 Address / Data signal (AD7) In/Out Pulse High 27 A8 Address signal (A8) Out Pulse High 28 A9 Address signal (A9) Out Pulse High 29 A1 0 Address signal (A10) Out Pulse High 30 A1 1 Address signal (A11) Out Pulse High 31 A1 2 Address signal (A12) Out Pulse High 32 A1 3 Address signal (A13) Out Pulse High 33 VSS GND — GND GND 34 A1 4 Address signal (A14) Out Pulse High 35 A1 5 Address signal (A15) Out Pulse High 36 INIT PAD2 status — — — 3 7 VPP PAD1 status — — — 38 DSR Data set ready signal In High High 39 KC4 Key common signal (KC4) Out Pulse High 40 RD Output enable signal of RAM/ROM (RD) Out Pulse High 41 W R Write enable signal of RAM (WR) Out Pulse High 42 RA14 Address signal of ROM (Bank 0) Out High High 43 ASTB Latch enable for Address decoder (ASTB) Out Pulse Low 44 KI12 Key input signal (KI12) In High High 45 KI13 Key input signal (KI13) In High High 46 RA16 Address signal of ROM (Bank2) Out High High 47 RA15 Address signal of ROM (Bank 1) Out High High 48 MD Motor drive signal of printer (MD) Out Low Low 49 DRW Drawer drive signal (DRW) Out Low Low 50 BUZ Buzzer signal (BUZZ) Out Low Low 51 F D Paper feed signal of printer (FD) Out Low Low 52 HD.A Head drive signal of printer (HD.A) Out Low Low 53 HD.B Head drive signal of printer (HD.B) Out Low Low 54 HD.C Head drive signal of printer (HD.C) Out Low Low 55 HD.D Head drive signal of printer (HD.D) Out Low Low

— 5 —

Status of

Power On

Status of

Power OFF

Pin No. Signal Description In/Out

Status of

Power On

56 HD.E Head drive signal of printer (HD.E) Out Low Low 57 HD.F Head drive signal of printer (HD.F) Out Low Low 58 HD.G Head drive signal of printer (HD.G) Out Low Low 59 HD.H Head drive signal of printer (HD.H) Out Low Low 6 0 RESET Reset signal (RESET) In High High 61 DP Dot pulse form printer (DP) In Low High 62 RP Reset pulse from printer (RP) In High High 63 OFF Mode key status (OFF) Out High Low 64 PWD Power down signal (PWD) In Low High 65 RB0 Address signal for RAM (Bank 0) Out High High 66 RB1 Address signal for RAM (Bank 1) Out High High 67 RB2 Address signal for RAM (Bank 2) Out High High 68 VDD VDD — 5 V 5 V 69 X2 System clock (5 MHz) In Pulse High 70 X1 System clock (5 MHz) In Pulse High 71 I C GND — GND GND 72 XT2 Sub system clock (32.768 KHz) In Pulse Pulse 73 XT1 Sub system clock (32.768 KHz) In Pulse Pulse 74 AVDD VDD — 5 V 5 V 75 AVREF0 VCC — GND GND 76 BAT Low battery signal In High High

77 VPP.S VPP detection signal (VPP.S) In Lo w Low 78 FB0 Address signal of Fiscal ROM bank 0 Out High High

79 FB1 Address signal of Fiscal ROM bank 1 Out High High 80 FB2 Address signal of Fiscal ROM bank 2 Out High High

Status of

Power OFF

— 6 —

4-3. Display controller (uPD16312GB-3B4)

Pin No. Signal Description In/Out

1 SW1 Not used (GND) — GND GND 2 SW2 Not used (GND) — GND GND 3 SW3 Not used (GND) — GND GND 4 SW4 Not used (GND) — GND GND 5 DOUT Data out signal to CPU Out High High 6 DI N Data in signal from CPU In Pulse High 7 VSS GND — GND GND 8 CLK Clock signal (CLK) In Pulse High

9 STB Data strobe signal (STB) In Pulse High 1 0 KEY1 Not used — — — 1 1 KEY2 Not used — — — 12 KEY3 Draw er sensor signal (DRW.S) I n High High 13 KEY4 VCC — 5 V 5 V 14 VDD VCC — 5 V 5 V 1 5 SEG1 Display segment signal (Sa) Out Pulse Low 1 6 SEG2 Display segment signal (Sb) Out Pulse Low 1 7 SEG3 Display segment signal (Sc) Out Pulse Low 1 8 SEG4 Display segment signal (Sd) Out Pulse Low 1 9 SEG5 Display segment signal (Se) Out Pulse Low 2 0 SEG6 Display segment signal (Sf) Out Pulse Low 2 1 SEG7 Display segment signal (Sg) Out Pulse Low 2 2 SEG8 Display segment signal (Sdp) Out Pulse Low 2 3 SEG9 Display segment signal (Str) Out Pulse L ow 2 4 SEG10 Display segment common signal (Scom) Out Pulse Low 2 5 SEG11 Not used Low Low 2 6 SEG12 Not used Low Low 27 VEE Power for display (-VN) — -32 V -32 V 28 GRD10 Display digit signal (G10) Out Pulse L ow 29 GRD9 Display digit signal (G9) Out Pulse Low 30 GRD8 Display digit signal (G8) Out Pulse Low 31 GRD7 Display digit signal (G7) Out Pulse Low 32 GRD6 Display digit signal (G6) Out Pulse Low 33 GRD5 Display digit signal (G5) Out Pulse Low 34 GRD4 Display digit signal (G4) Out Pulse Low 35 GRD3 Display digit signal (G3) Out Pulse Low 36 GRD2 Display digit signal (G2) Out Pulse Low 37 GRD1 Display digit signal (G1) Out Pulse Low 38 VDD VCC — 5 V 5 V 39 LED4 Not used — Pulse Low 40 LED3 Not used — Pulse Low 41 LED2 Not used — Pulse Low 42 LED1 Not used — Pulse Low 43 VSS GND — GND GND 44 OSC System clock (500 KHz) In Pulse Pulse

Status of

Power On

Status of

Power OFF

— 7 —

4-4. Initilize IC (Reset circuit)

VDD: Voltage of memory protection battery

To Pin No.60 of CPU

When the voltage level at Pin No.60 of CPU is not stabilized, CPU does not work properly in rare case. Therefore, this machine uses the initialize IC for stabilizing the voltage. Even the voltage level of VDD (Pin No.2) is changed, Pin No.1 of initilize IC outputs stabilized 5 volts. When the VDD voltage become less than 1.9 V, the initialize IC send a reset signal to CPU.

4-5. Power down detection circuit (PWD)

To Pin No.64 of CPU

When the VP voltage become less than 4.8 V, the pin No.1 of IC5 become “Low” level. Then,the transistor Q44 become OFF. When Q44 become OFF, the voltage lebel of pin No.64 of CPU changes to “High” level from “Low”. Then, CPU knows power failure.

4-6. Address latch circuit

CPU uses 8 port (AD0 ~ AD7) for address bus and data bus. To select the address, CPU use the IC13. CPU send the address to IC13, and send ASTB signal at same time. Then, IC13 store the address and output the address immediately. In this way, CPU select the address and data signal.

— 8 —

4-7. RAM / ROM bank selection circuit

This circuit is used for address decoder for memory.

0000

2000

Memory Map

Mask ROM (16 K)

00001

000000

Bank 0

4000

EP ROM

6000

Common (16 K)

8000

EP ROM Bank select area

A000

(16 K)

C000

RAM common area (8 K)

E000

RAM BANK select area (4 K)

F000

Outer I/O area

FA80

Internal RAM (High speed access)

FFFF

— 9 —

RAM 256 K

00011

00010

Bank

Bank 1

KI signal port (F800,F801)

Bank 3

Buffer RAM 32 bytes

Internal RAM (High speed access) 288 bytes

Internal RAM (High speed access) Short direct area 192 bytes

General purpose register 32 bytes

Special function register (SFR) 256 bytes

00100

Bank 4

00101

00110

Bank 5

F800 FAC0 FAE0

FD00

FE20

FEE0

FFF0

RAM 1 M

11101

Bank 29

4-8. Head drive circuit for printer

TR5

TR4

TR3

TR1

TR2

Motor drive circuit Normally, the transistor of motor drive circuit is followng condition.

TR1, TR2, TR5 : OFF TR3, TR4 : ON MD (-) signal : VP level

When the CPU want to rotate the motor, CPU change the MD signal to “High” from “Low”. Then, TR1, TR2 and TR5 are become ON and MD (-) signal is become GND level, and then motor is rotated.

Head drive circuit When the CPU wants to print, CPU send “High” signal from HD.A ~ HD.H terminal.

This signal goes to printer unit, and then print. RP: Reset pulse from printer

DP: Dot pulse from printer

— 10 —

4-9. VPP sensor circuit

Protection circuit

To prevent the circuit breakage, the protection circuit watches the voltage level of VCC, VDD and VPP. When the each voltage level is more than following condition, this circuit cuts the voltage.

VCC,VDD: In case these voltages are become over voltage, this circuit outputs “SCR”

signal(High signal) and burn out the fuse.

VPP: In case the VPP voltage is more than 15 V or less than 13.9 V, the “VPP.S” level

is inverted and CPU cut the “VPP.ON” signal.

Detection voltage level (Unit: V)

VCC >= +6.5 V VDD >= +6.5 V +13.9 V =< VPP <=15.0 V

4-10. Power supply circuit for display

GNDVP

This circuit is making the power for display tube. Voltage level: -VN Est. -31.2 V

VF1 - VF2 Est. AC4.85 V

— 11 —

5. DIAGNOSTIC

5-1. To start the diagnostic program

1. Set the mode switch to “OFF” position.

2. Pressing the “FEED” button and turn the mode switch to “PRG” position.

3. Release the “FEED” button.

4. Input “9999900000” and press “ST” (“#2” key).

5. Diagnostic program is executed.

5-2. Check item

The following test can be checked in the diagnostic test.

1. Key code test

2. Switch status test

3. Individul function test.

5-3. Operation of each test

1. Key code test

When pressing a key, the machine displays the following key code.

HARD KEY CODE TABLE

FEED 055 051 789046 040 034 028 022 016

058 054 050 456045 039 033 027 021 015

057 053 049 123044 038 032 026 020 014

056 052 C0011 012 043 037 031 025 019 013

DISPLAY

0 1 3

Hard key code

048 042 036 030 024 018

047 041 035 029 023 017

“020” & “026” buttons are work for “#2” key.

— 12 —

2. Switch status test Press “C” button, the switch status is appeared on the display.

[DISPLAY]

No display No display

Low battery

L: Low battery

Nil: Battery OK

PAD2 status

1: Short 0: Open

PAD1 status

1: Short 0: Open

Always: 1

Drawer sensor

1: Close 0: Open

Mode switch status

1: PGM 2: RF 3: REG 4: CAL 5: X 6: Z No display: OFF

— 13 —

3. Individual function test 3-1. Series test

“Y” “X” “1” + “#2” key

Y: 0: Normal test

1: Execute next test even if an error happend at ROM check sum

X: 0: Autockecking of RAM capacity

1: 256 Kbit RAM test 2: 1 Mbit RAM test

Execute the following test in order.

1. Display test

2. Check sum test of EP-ROM

3. RAM test

4. Drawer open test

5. Printing test

6. Date and Time test

1. Display test (All segment light on)

2. Ckeck sum test of EP-ROM Normal end Error end

ROM SUM OK

XX00: Check sum value XXXX : Check sum value

3. RAM test (Read/Write test)

Normal end receipt

256 Kbit RAM 1 Mbit RAM

Error end receipt

RAM 32K E R

4. Drawer open test

5. Printing test

BBBBBBBBBBBBBBBBBBBBBBBB

YY: Bank XXXX: Address

ROM E R

RAM 128K R/W OK RAM 32K R/W OK

6. Date and Time test Set the date and time as follows.

Date : 31 / 12 / 96 Time : 25:59

Then, issues a receipt and display the following character.

1 2. 3 4 5. 6 7 8. 9 0

— 14 —

3-2. Print test

Input “Y” “X” “2” + “#2” key.

X: 0: Print the following character continuously.

Printing speed : 45 times / Min.

1: Print the following character, open the drawer and issue a receipt

Printing speed : 25 times / Min. Drawer open : 5 times / Min. Receipt issue : 5 times / Min.

Y: 0: No effect

1: Print the following character without waiting time. ( Continuously print )

To stop this test, press any key or turn the mode switch to “OFF” position.

Printing sample:

3-3. RAM read only test

Input “X” “5” + “#2” key.

X: 0: Read the data from start to end address and issues receipt.

1: Read the data from start to end address continuously until power off. Brink " - " signal on the display during checking.

Note: Be sure to execute the series test ( 1 + #2 ) before this test.

256 Kbit check receipt 1 Mbit check receipt

Display

3-4. INIT OPERATION (To set a Factory Default setting)

Input “8” “6” + “#2” key.

BBBBBBBBBBBB

RAM 128K READ OK RAM 32K READ OK

The machine is executed a INIT operation according to PAD status. Set the data and time to “0”. (00-00-00, 00:00:00)

3-5. Voltage check for Memory protection battery

Input “7” + “#2” key. Display the battery voltage.

To stop this test, press any key or turn the mode switch to “OFF” position.

X XX

X.XX: Voltage value

— 15 —

+ 37 hidden pages

CASIO CE300 Service Manual

CE-300 (EX-247)

CONTENTS

1. SPECIFICATIONS

3. BLOCK DIAGRAM

3-1. PCB connection

3-2. Block diagram (circuit)

4. CIRCUIT EXPLANATION

4-1. Power supply circuit

4-2. CPU (uPD78052GC-093-3B9)

4-3. Display controller (uPD16312GB-3B4)

4-4. Initilize IC (Reset circuit)

4-5. Power down detection circuit (PWD)

4-6. Address latch circuit

4-7. RAM / ROM bank selection circuit

4-8. Head drive circuit for printer

4-9. VPP sensor circuit

4-10. Power supply circuit for display

5. DIAGNOSTIC

5-1. To start the diagnostic program

5-2. Check item

5-3. Operation of each test