CASIO CE2400 Service Manual

SERVICE MANUAL

(without price)

ELECTRONIC CASH REGISTER

CE-2400 (EX-259B)

OCT. 1996

Printer Model : CR-710

	CONTENTS
		Page
1.	FEATURES...................................................................................................	1
2.	SPECIFICATIONS ........................................................................................	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
	4-4-1. Display, RAM, drawer and printer check ........................................................	5
	4-4-2. RAM read only check .......................................................................................	6
	4-4-3. Voltage check of memory back-up battery .....................................................	6
	4-4-4. All characters print check ................................................................................	7
	4-4-5. Display the time ................................................................................................	7
	4-4-6. How to release the diagnostic mode ...............................................................	7
5.	OPTION CIRCUIT .........................................................................................	8
6.	CIRCUIT EXPLANATION .............................................................................	9
	6-1. Power supply circuit ...................................................................................................	9
	6-2. CPU (μPD75517GF-400-3B9) ....................................................................................	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. Initialize IC (Reset IC) ................................................................................................	14
	6-7. Printer error condition of CPU .................................................................................	14
	6-8. Error code ..................................................................................................................	14
7.	TO OPEN THE UPEER CASE ...................................................................	15
8.	PCB LAYOUT.............................................................................................	16
9.	CIRCUIT DIAGRAM ...................................................................................	17
10.	PARTS LIST ...............................................................................................	28

1. FEATURES

The difference between CE-2350 and CE-2400 is as follows.

Item	CE-2350	CE-2400
Department number	38	40
PLU number	400	500
Clerk number	10	20
Calculator function	Nil	Available

2. SPECIFICATIONS

2-1. Electrical specifications
	• Power consumption	Specification		0.35 A
		In operation	Max.	0.22 A
			Min.	0.09 A
		Power OFF		0.08 A
	• Memory protection	Back-up battery		Mangan battery (UM-3 × 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	1.5 G (The machine must be in the carton box)

2-3. Principal components

• CPU	Name	μPD75517GF-400-3B9
	Number of control bit	4
	Internal RAM	512 × 4 bits
	Internal ROM	12160 × 8 bits
	Main system clock	4.19 MHz
	Sub system clock	32.768 KHz
• RAM	Name	LC36256AL70/85/10
	Capacity	32 KB

— 1 —

	• 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			W 44.5 ± 0.5 mm
		Paper diameter			83 mm or less
		Paper thickness			0.06 ~ 0.09 mm
		Ink roll			IR-93
		Ribbon life			400,000 lines
	• Display	Name			LED (HDSP-5261)
		Number of digit			8 digits (LED × 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.
2-4. 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.

0	0	•	0		0	•	0	0					Date
			0		0	:	0	0					Time
			No 0			0	0	1					Consecutive No.
0 0 0			0	0	0 0 0 0								MAC print
•	•	2	7	4	9	•	•

— 2 —

Notes:

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.

0	0	•	0		0	•	0	0					Date
			0		0	:	0	0					Time
			No 0			0	0	2					Consecutive No.
•	•	•	•	•	•	•	•	–					Start printing for diagnostic program
•	•	2	7	4	9	•	•

— 3 —

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.

2		0		1		0		0					0
											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			3
											Hard key code
																			20	26	32	38	43
	Receipt						Journal						C	13		14			19	25	31	37	42
	FEED						FEED
																			18	24	30	36	41
	47						51					7		8		9
	46						50					4		5		6			17	23	29	35	40
																			16	22	28	34	39
	45						49					1		2		3
	44						48					0		10		11			15	21	27	33

— 4 —

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.

(5)Printing check

Print the following character.

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

— 5 —

(6) Receipt issue

The following receipt is issued.

0	1	•	0	1	•	9	2
4	5	1	2	:	3	4
		No 0		0	0	4

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

(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

blinks " -- " 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.

— 6 —

4-4-4. All characters						print check
									+
Operation :						8						ST
			0	1 •		0	1	•	9	2
			4	5		1	2	:	3	6
						No 0 0 0 5
	Z 0 0 0					0	0		0	0		0	0	CA CD
	1	1	1	1		1	1		1	1		1	1	CH	I
	2	2	2	2		2	2		2	2		2	2	RA	II
	3	3	3	3		3	3		3	3		3	3	PO	III
	4	4	4	4		4	4		4	4		4	4	CK IV
	5	5	5	5		5	5		5	5		5	5	#	ST
	6	6	6	6		6	6		6	6		6	6	VD CG
	7	7	7	7		7	7		7	7		7	7	TX	Q
	8	8	8	8		8	8		8	8		8	8	TA @
	9	9	9	9		9	9		9	9		9	9	NS AT
	+ CR TL
	•	• • • • • • • • –													–
	X		PL			No			:			%		RF

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.

— 7 —

5. OPTION CIRCUIT

Power protection battery B-6

Power protection battery B-6 is available for CE-2350.

However, interface circuit is not mounted to 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

Interface circuit for B-6

▼

Pin assignment for B-6 connector

Pin layout

Pin No.	Description
1	F.G. (Green)
2	Not used
3	CS (Black)
4	GND (Blue)
5	Not used
6	VP (Brown)

— 8 —

6. CIRCUIT EXPLANATION

6-1. Power supply circuit

FROM TRANSFORMER

F1

D2

1SR35-100A

CN1

1

02A-5277

C4

50F2S683J

1SR35-100A

F50WV3300C1

D1

2

1SR35-100A

D4

D3

1SR35-100A

2

5

7

8

9

1

WITH HEATSINK

OSH-1625-SP

PWD

2SD1196

VP 24V

LM2575T-5.0

3

R121K

Q1

5.1K

ZD3

RD16EB3

10

VIN 1

5

ON/OFF

VOUT

VIN

2

OUTPUT

C5

C103 ZD2

RD7·5EB3

R13 R8

2.7K R7

820

10KR15

C9

F50WV1

Q3

2SC4640

47-50RE2

GND

4

FEEDBACK

C8

1S2473

D814-RK

330-25RE2

R14

IC1

GND

Q2

100K

3

47~63KHz

D7

11

4

2SC4640

D9

C6

MCDR1419-681K

VLED 5.6V

1S2473

L1

12

D11

VCC 5.0V

1S2473

GNDP

GND

6

Q1 : Transistor for controlling voltage (VP)

Q2 : Transistor for voltage detection

Q3 : Transistor for controlling power down (PWD) signal

ZD2 : Zenner diode for controlling base current of Q2

ZD3 : Zenner diode for detecting power down (PWD) signal

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

[Voltage VP]

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

[Voltage VLED and VCC]

The voltage goes to pin No.1 of regulator IC1 and then it is out from pin No.2 of IC1 as stable voltage (5.6 V).

Then this voltage falls 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.

— 9 —

[PWD signal]

After plugging 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 informs "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: When plugging the AC cord into outlet, all voltages are supplied to the PCB. If you open the machine for repair, make sure to unplug it.

[Location for voltage check points]

Actual value on the E259-1 PCB [unit : V]

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	0	0	0	0

1

10

4

6

11

2

3

5

8

9

7

12

— 10 —

6-2. CPU (μPD75517GF-400-3B9)

	Pin No.	Signal	Descriptions	I/O	PW-on
					level
	1	AN0	Mode switch signal (RF, OFF, REG, X, Z) signal	In	2.0V
	2	AVREF	VCC terminal (+5 V)	—	5.0V
	3	VDD	VDD terminal (+5 V)	—	5.0V
	4	VDD	VDD terminal (+5 V)	—	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 common signal (Dg4)	Out	Pulse
	39	P32	Display segment common signal (Dg3)	Out	Pulse
	40	P31	Display segment common signal (Dg2)	Out	Pulse
	41	P30	Display segment common 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

— 11 —

	Pin No.	Signal	Descriptions	I/O	PW-on
					level
	50	P03/SI0/SB1	Key input signal (KI3)	In	High
	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 (32.768 KHz)	In	Pulse
	56	XT2	Sub system clock signal (32.768 KHz)	In	Pulse
	57	IC	GND terminal	—	—
	58	X1	Main system clock signal (4.19 MHz)	In	Pulse
	59	X2	Main system clock signal (4.19 MHz)	In	Pulse
	60	RESET_	Initialize 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)	I/O	High
	66	P132	RAM data signal (D2)	I/O	High
	67	P131	RAM data signal (D1)	I/O	High
	68	P130	RAM data signal (D0)	I/O	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

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.

6-3. Motor error detection circuit

When 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 high.

If motor happens over load (paper jam etc.), over load current (250mA) runs resistor R9. So " A" point voltage level becomes high.

Then IC4 outputs high signal and then CPU knows motor error occured. Whe the CPU receives "Motor error signal" CPU stops motor signal.

			VP
	1SR-35-100A		22K	R6
VP	D35		(±2%)				8	BA10393
						3
						2	+	1
To Printer		3.9	(R50X)				–	IC4
				(±2%)				C10
			R9	R10	1K
								TFC103
			Q8					1.5K	R26
		2SD1853
		GNDP		10K		R11
		— 12 —

	VCC
	10K
R37	MOTOR ERROR

To CPU

MOTOR