Casio PCR-255 User manual

SERVICE MANUAL

ELECTRONIC CASH REGISTER

(without price)

Printer Model : M42V

PCR-260(EX-266B)

PCR-255(EX-267B)

SEP. 1996

CONTENTS

Page

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

2. SPECIFICATIONS........................................................................................ 1

3. OPTION ........................................................................................................ 2

4. MAC OPERATION ....................................................................................... 2

5. BLOCK DIAGRAM ....................................................................................... 3

6. CIRCUIT EXPLANATIONS .......................................................................... 4

6-1. Power supply circuit .....................................................................................................4

6-2. Reset circuit ................................................................................................................. 5

6-3. Printer drive circuit ....................................................................................................... 6

6-4. Pin description ............................................................................................................. 6

7. DISASSEMBLY ............................................................................................ 8

7-1. To open the upper case ...............................................................................................8

7-2. To remove the Main PCB.............................................................................................8

7-3. To remove the keyboard ass'y .....................................................................................8

8. DIAGNOSTOC OPERATIONS.....................................................................9

8-1. To start the diagnostic operation...................................................................................9

8-2. Check items .................................................................................................................. 9

8-3. Operations .................................................................................................................. 10

9. IC DATA ..................................................................................................... 13

9-1. LB1268........................................................................................................................ 13

9-2. S-80728AN-Z .............................................................................................................. 13

10. CIRCUIT DIAGRAM ................................................................................... 14

11. PCB LAYOUT............................................................................................. 23

12. PARTS LIST............................................................................................... 24

— 1 —

1. FEATURES

2. SPECIFICATIONS

PCR-260

Function PCR-260 (U.S.A.) PCR-255 (U.S.A.)

Department number 10 10

PLU function 100 100

Customer display Nil Effective

PRG data back up function Nil Nil

Calculator function Effective Effective

120V

Power consumption In operation Max. 4.5W 0.09A

Stand-by - 0.06A

Mode SW OFF - 0.05A

Memory protection Backup battery Mangan battery UM-3 ×3 pcs. (25°C)

Backup period 1 year (25°C)

Battery life Replace every 1 year

Clock and calender Accuracy Within ±30 sec. per month

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 M-42V

Print method Print wheel selecting type serial printer

Print digits 12 digits (Amount 10 digits : Symbol 2 digits)

MCBF 700,000 lines

Ink roller Model IR-40 (Purple)

Life 1,000,000 characters

Roll paper Type Fine-quarity paper

Size 57.5±0.5 mm

Roll diameter 80 mm or less

Drawer S drawer (Coin 5/Bill 4) DL-1319

— 2 —

120V

Power consumption In operation Max. 0.11A

Stand-by 0.07A

Mode SW OFF 0.06A

Memory protection Same as PCR-260

Clock and calender Same as PCR-260

Environment Same as PCR-260

Printer Same as PCR-260

Ink roller Same as PCR-260

Roll paper Same as PCR-260

Drawer S drawer (Coin 5/ Bill 4) DL-1319

PCR-255

3. OPTION (PCR-260/255)

• Wet cover WT-69

4. MAC OPERATION (Memory All Clear Operation)

1. Set the Mode Switch to OFF.

2. Plug the power cord of the ECR off an AC outlet.

3. Remove the memory protection batteries.

4. Leave the ECR a few minutes and plug the power cord into an AC outlet.

5. Set the memory protection batteries.

6. Turn the Mode Switch to REG position.

— 3 —

Voltage detection

Winder Motor drive circuit

Printer drive circuit

Drawer drive circuit

Reset IC

Buzzer

KEYBOARD

DISPLAY

CPU

5. BLOCK DIAGRAM

— 4 —

CN8

*B, *D, *G

E412181*1

T1

TE-266-E2U

FUSE 1A

10 F1

C1

HE12TKYB103K

1SR35-100A X 4

WITH HEATSINK

OSH-1625-MP

Q1 2SD2396(K)

25V4700uF C8

HE60TKYB222K

R1 1K

ZD1

RD6. 8EB1

C7

10V100uF

R16

560 R17

150

HE60TKYB222K

ZD5

RD3. 3EB2 VDD

R14

470K

2SC945 C23

ECQ-B1H103-KF

C28

DSTC50TKYR103K

CRH100-FH11J-1R0

1S2075K RD24EB2

D6 ZD3 1S2075K

2SD1803(T)

10V100µ

50V4. 7uF

D5 C4

C11 C17

HE12TKYB103K

C6

HE50TKYB102K

ZD2

RD36EB1

750

R6

24K

C5

HE12TKYB

103K

R5

100

5ZD4

RD4. 3EB2

D7

1S2471

T2

DCS-267

VF1

VF2

VDD

VDW

PWD

GND

GNDP

6. CIRCUIT EXPLANATIONS

6-1. Power supply circuit

1. Plug the power cord into AC outlet, secondary voltage (9.65VAC) of the power transformer T1 will

be appears at "A" point.

2. Then, its AC voltage is rectified by the diode bridge and change it to DC voltage. ("B" point)

3. DC voltage appears more than 7V at the corrector of power transistor 2SD2396, and then the power

transistor is turned on.

Then VP is supplied. ("C" point)

4. When the VP voltage becomes more than 3.3V, the transistor 2SD945 is turned on and then PWD

signal becomes GND level. ("F" point)

When the PWD signal becomes GND level, CPU knows no power failure.

5. VP is supplied at the DC DC converter trans T2, the DC DC converter makes display and logic circuit

voltage.

VN ,VF1,VF2 : Display voltage ("I", "J" point )

VDD : Logic circuit voltage ("H" point)

Transistor 2SD1803 is used for oscillating the primary voltage of DC DC converter trans.

— 5 —

Voltage level is measured at the following condition.

1. Plug the power cord in AC outlet.

2. Mode switch position : REG, display 0.00

3. Put in the memory protection batteries.

4. Plug out : Plug out the power cord , the memory protection batteries in.

6-2. Reset circuit

When the voltage level at the pin No.17 of CPU is

not stable, CPU does not work properly.

To make a stable voltage, the reset IC(S-80728AN)

is used for this circuit.

In case the voltage level of VDD becomes down

output terminof reset IC is out the stable voltage.

BGND

RESET

Pin No.17

VDD

GND

S-80728AN

ABC

GH I

Power ON

9.65 VAC

10.52V

5.76V

10.45V

0.78V

0.12V

Pulse

5.07V

-23.9V

Plug out

000

4.13V

4.30V

— 6 —

6-3. Printer drive circuit

When the CPU start printing, CPU send MD signal to rotate motor unit.

Then the printer send back the RP(reset pulse),PT and PT (Timing pulse) to CPU.

After CPU receive RP,Pt and PT, CPU knows the position of print wheel.

And then, CPU send HD signal to operate the printing magnet when the character selected.

The CPU counts the TP signal to select the character.

6-4. Pin description (CPU uPD78044AGF)

CPU

Pin No.44

Pin No.45

Pin No.47

Pin No.62

Pin No.63

Printer M42

Pin No. Signal In/Out Mode SW

REG Mode SW

OFF AC cord

Plug off Description

1 P94/FIP6 Out Pulse -24V L Display digit signal DG7

2 P93/FIP5 Out Pulse -24V L Display digit signal DG6

3 P92/FIP4 Out Pulse -24V L Display digit signal DG5

4 P91/FIP3 Out Pulse -24V L Display digit signal DG4

5 P90/FIP2 Out Pulse -24V L Display digit signal DG3

6 P81/FIP1 Out Pulse -24V L Display digit signal DG2

7 P80/FIP0 Out Pulse -24V L Display digit signal DG1

8 VDD - +5V +5V +5V VDD terminal

9 P27/SCK0 In/Out - - - Not used

10 P26/SO0/SB1 In/Out - - - Not used

11 P25/SI0/SB0 In/Out - - - Not used

12 P24/BUSY In/Out - - - Not used

13 P23/STB Out H H H Strobe signal for AVREF

14 P22/SCK1 Out L H H SK signal for EEPROM

15 P21/SO1 Out L H H DI signal for EEPROM

16 P20/SI1 In H H H DO signal for EEPROM

17 RESET In H H H Reset signal

18 P74 Out H H L Drawer open signal

19 P73 Out L H H Common signal for PAD condition

20 AVSS - GND GND GND GND for AD converter

21 P17/ANI7 In GND GND GND GND

22 P16/ANI6 In GND GND GND GND

23 P15/ANI5 Out L L H Chip enable signal for EEPROM

24 P14/ANI4 In GND GND GND GND

25 P13/ANI3 In GND GND GND GND

26 P12/ANI2 In GND GND GND GND

27 P11/ANI1 In GND GND GND GND

28 P10/ANI0 In H H H Low battery detection terminal

29 AVDD - H H H Power for AD converter

30 AVREF In L L L Voltage for AD converter (VDD)

31 XT1 In Pulse Pulse Pulse Sub system clock

32 XT2 - Pulse Pulse Pulse Sub system clock

33 VSS - GND GND GND GND

34 X1 In Pulse L L Main system clock

35 X2 - Pulse H H Main system clock

36 P37 In L L L Mode switch position (OFF)

37 P36/BUZ Out L L L Buzzer signal

38 P35/PCL In L L L Mode switch position (Z)

39 P34/T12 In L L L Mode switch position (X)

40 P33/T11 In L L L Mode switch position (CAL)

— 7 —

Note : Above data is measured under following condition.

Mode SW REG : AC cord plug in the AC outlet, Memory protection batteries in,

Mode SW position : REG

Mode SW OFF : AC cord plug in the AC outlet, Memory protection batteries in,

Mode SW position : OFF

AC cord plug off : AC cord plug out the AC outlet, memory protection batteries in,

Mode SW position : OFF

Pin No. Signal In/Out Mode SW

REG Mode SW

OFF AC cord

Plug off Description

41 P32/TO2 In H L L Mode switch position (REG)

42 P31/TO1 In L L L Mode switch position (RF)

43 P30/TO0 In L L L Mode switch position (PRG)

44 P03/INTP3/CI0 In H L L Reset pulse RP from printer

45 P02/INTP2 In H Pulse L Sub timimg pulse Pt from printer

46 P01/INTP1 In L L H Power down signal PWD

47 P00/INTP0/TI0 In H L L Main timing pulse PT from printer

48 IC - GND GND GND GND

49 P72 In H H H TAX PAD signal for Japan

50 P71 In - - - PAD2 condition

51 P70 In L H H PAD1 condition

52 VDD - +5V +5V +5V Power (+5V)

53 P127/FIP33 In L L L Key input signal KI7

54 P126/FIP32 In L L L Key input signal KI6

55 P125/FIP31 In L L L Key input signal KI5

56 P124/FIP30 In L L L Key input signal KI4

57 P123/FIP29 In L L L Key input signal KI3

58 P122/FIP28 In L L L Key input signal KI2

59 P121/FIP27 In L L L Key input signal KI1

60 P120/FIP26 In L L L Key input signal KI0

61 P117/FIP25 Out L L L Winder motor drive signal WMO

62 P116/FIP24 Out L L L Printer moter drive signal PMO

63 P115/FIP23 Out L L L Head drive signal for printer PHD

64 P114/FIP22 Out Pulse L L Key common signal KC3

65 P113/FIP21 Out Pulse L L Key common signal KC2

66 P112/FIP20 Out Pulse L L Key common signal KC1

67 P111/FIP19 Out Pulse L L Key common signal KC0

68 P110/FIP18 Out H H H Not used (+5V)

69 P107/FIP17 Out Pulse -24V L Display segment signal Sdp (Decimal point)

70 P106/FIP16 Out Pulse -24V L Display segment signal Sg

71 VLOAD - -24V -24V L Display voltage VN

72 P105/FIP15 Out Pulse -24V L Display segment signal Sf

73 P104/FIP14 Out Pulse -24V L Display segment signal Se

74 P103/FIP13 Out Pulse -24V L Display segment signal Sd

75 P102/FIP12 Out Pulse -24V L Display segment signal Sc

76 P101/FIP11 Out Pulse -24V L Display segment signal Sb

77 P100/FIP10 Out Pulse -24V L Display segment signal Sa

78 P97/FIP9 Out H Pulse L Mode switch common signal

79 P96/FIP8 Out Pulse -24V L Display digit signal DG9

80 P95/FIP7 Out Pulse -24V L Display digit signal DG8

— 8 —

7. DISASSEMBLY

7-1. To open the upper case

1. Take out the printer cover and release the screw A.

2. Pushing the position B and slide the upper case to backward.

3. Lift up the upper case and remove the drawer connector.

7-2. To remove the Main PCB

1. Remove all cables on Main PCB and release 3 pcs of screw B.

2. Take out the Main PCB ass'y.

7-3. To remove the keyboard ass'y

1. Release the 4 hooks and push the keyboard ass'y down.

Screw A

Position B

Slide this direction

Screw B

Hook Hook

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