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
6
10 F1
C1 HE12TKYB103K
1SR35-100A X 4
D1
D2
D3
D4
C3
WITH HEATSINK
OSH-1625-MP
Q1 2SD2396(K)
25V4700uF C8
HE60TKYB222K
R1 1K
ZD1
RD6. 8EB1
C7
10V100uF
R16
560 R17
150
HE60TKYB222K
C9
ZD5
RD3. 3EB2 VDD
R14
470K
Q7
2SC945 C23
ECQ-B1H103-KF
C28
DSTC50TKYR103K
CRH100-FH11J-1R0
1S2075K RD24EB2
R3
D6 ZD3 1S2075K
2SD1803(T)
8
9
10V100µ
50V4. 7uF
D5 C4
C11 C17
HE12TKYB103K
C6 HE50TKYB102K
ZD2
RD36EB1
Q2
R4 750
R6 24K
C5
HE12TKYB
103K
R5
100
1
2
7
3
4
5ZD4
RD4. 3EB2
D7
1S2471
T2
DCS-267
VF1
VF2
VN
VDD
VDW
VP
PWD
GND
GNDP
I
G
H
DE
A
B
C
F
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.
A
BGND
E
F
C
I
DG
H
RESET
Pin No.17
VDD
GND
S-80728AN
ABC DE F 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 00 4.13V 0 4.30V 0

— 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
RP
Pt
PT
MD
HD
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
Position B
Slide this direction
Screw B
Hook Hook
Hook Hook