Sharp ER-A310, ER-A330 User Manual

SERVICE MANUAL

ER-A310

ER-A330

CODE: 00ZERA310USME

ELECTRONIC CASH REGISTER

ER-A310 MODEL ER-A330

SRV Key : LKGIM7113RCZZ PRINTER : ER-A310 : CR-510

ER-A330 : UCR-812A (For "U" & "A" version)

CONTENTS

CHAPTER 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

CHAPTER 2. OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

CHAPTER 3. SRV. RESET AND MASTER RESET . . . . . . . . . . . . . . . . . . . . . . 6

CHAPTER 4. HARDWARE DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

CHAPTER 5. TEST FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

CHAPTER 6. CIRCUIT DIAGRAM & PWB LAYOUT . . . . . . . . . . . . . . . . . . . . 20

PARTS GUIDE

Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

This document has been published to be used

SHARP CORPORATION for after sales service only.

The contents are subject to change without notice.

CHAPTER 1. SPECIFICATIONS

1. Appearance/Rating

1) Appearance

1 ER-A310

Journal paper

Printer cover

Receipt paper

Customer display (Pop-up type)

Operator display

Mode switch

Keyboard

Drawer

Drawer lock

2 ER-A330

Journal paper

Customer display (Pop-up type)

Printer cover

Operator display

Receipt paper

Mode switch

Keyboard

Drawer

Drawer lock

2) Rating

		ER-A310	ER-A330
	Power source	120V AC ± 10%, 50/60 Hz
	Power	Stand-by: 10W	Stand-by: 10W
	consumption	Operating: 31W (Max.)	Operating: 38W (Max.)
	Operating	32˚F to 104˚F (0˚C to 40˚C)
	temperature
	Operating	10% to 90% (RH)
	humidity
	Physical	420 (W) × 423 (D) ×	420 (W) × 423 (D) ×
	dimensions,	304 (H) mm	314 (H) mm
	including the	(16.5 (W) × 16.7 (D) ×	(16.5 (W) × 16.7 (D) ×
	drawer	12.0 (H) in.)	12.4 (H) in.)
	Weight	12.5 kg (27.6 lbs.)	13.5 kg (30.0 lbs.)

– 1 –

2. Keyboard

1) Standard keyboard layout

1 ER-A310

							PLU/SUB		NS
							X	3	8
			CL	7	8	9
	RECE IPT JOURNAL		C						7
	RCPT PRINT		@	4	5	6
			FOR				-	2	6
	RA		RFND	1	2	3
	RM								5
	PO	%	VOID	0	00	•	+
	CAL							1 •€ 4
				Dummy key			Dummy key

ESC AUTO

CH CONV

MDSE

SBTL CHK

#/TM/SBTL

CA/AT

=

Dummy key

	2 ER-A330
							CASH PLU		NS	ESC	FS	FS
							#	SUB			SHIFT TEND
										RA	CH1	CH2
								5	10 RM
			CL	7	8	9				PO	MDSE	CHK
	RECE IPT JOURNAL		C				•€	4	9	CAL	SBTL
	RCPT PRINT		@	4	5	6				CONV	#/TM/SBTL
			FOR				X	3	8
	1	2	RFND	1	2	3				AUTO
							-	2	7	1
											CA/AT
										AUTO
	%1	%2	VOID	0	00	•
							+	1	6	2	=

Dummy key		Dummy key

2) Key top name

1 Standard key top

	KEY TOP	DESCRIPTION	ER-A310	ER-A330
	- RECEIPT	Receipt paper feed key	è	è
	- JOURNAL	Journal paper feed key	è	è
	0~9,00	Numeric keys	è	è
	×	Decimal point key	è	è
	@/FOR	Multiplication key	è	è
	CL/C	Clear key	è	è
	PRINT	Validation print key	è	è
	Dept.1/+	Department 1/Plus key	è	è
	Dept.2/–	Department 2/Minus key	è	è
	Dept.3/´	Department 3/	è	è
		Multiplication key
	Dept.4/¸	Department 4/Division key	è	è
	Dept.5~8	Department 5~8 keys	è	É
	Dept.5~10	Department 5~10 keys	É	è
	PLU/SUB	PLU/Subdepartment key	è	è
	ESC	Error escape key	è	è
	CASH#	Cashier number entry key	É	è
	RCPT	Receipt print key	è	è
	d	Discount key	è	É
	d1, 2	Discount 1 and 2 keys	É	è
	AUTO	Automatic sequencing key	è	É
	AUTO1, 2	Automatic sequencing 1	É	è
		and 2 keys
	%	Percent key	è	É

KEY TOP	DESCRIPTION		ER-A310		ER-A330
%1, 2	Percent 1 and 2 keys		É		è
NS	No-sale key		è		è
RA/RM	Received on account/		è		è
	Recall memory key
PO/CAL	Paid out/		è		è
	Calculation mode key
RFND	Refund key		è		è
VOID	Void key		è		è
CH	Charge key		è		É
CH1, 2	Charge 1 and 2 keys		É		è
CHK	Check key		è		è
CONV	Conversion key		è		è
MDSE SBTL	Merchandise subtotal key		è		è
#/TM/SBTL	Non-add code/Time display/		è		è
	Subtotal key
CA/AT /=	Cash/Amount tendered/		è		è
	Equals key
FS SHIFT	Food stamp shift key		É		è
FS TEND	Food stamp tender key		É		è
2 Optional key top
KEY TOP	DESCRIPTION	ER-A310			ER-A330
Dept. 9~30	Department 9~30 keys	è			É
Dept. 11~50	Department 11~50 keys	É			è
DEPT#	Department number	è			è
	entry key
TAX1	Tax1 ~ Tax4 shift keys
SHIFT~TAX4		è			è
SHIFT
TAX	Manual tax key	è			è
AUTO2	Automatic sequencing 2	è			É
	key
AUTO3, 4	Automatic sequencing 3	É			è
	and 4 keys
CONV2~4	Conversion 2~4 keys	è			è
CA2	Cash total 2 key	è			è
CH2	Charge 2 key	è			É
d2	Discount 2 key	è			É
%2	Percent 2 key	è			É

– 2 –

4. Display

1) Operator display

PLU/SUB

DEPT REPEAT

RCPT

OFF

: This appears when a transaction is finalized.

: This appears when the cash register computes the subtotal.

: This appears when the chage due amount is displayed.

: This appears when the batteries are iow.

DISPLAY DEVICE	LED
NUMBER OF LINE	1 line
NUMBER OF POSITIONS	10 positions
COLOR OF DISPLAY	Green
CHARACTER SIZE	14.2mm (H) × 8.0mm (H)

2) Customer display (Pop-up type)

DISPLAY DEVICE	LED
NUMBER OF LINE	1 line
NUMBER OF POSITIONS	7 positions
COLOR OF DISPLAY	Green
CHARACTER SIZE	14.2mm (H) × 8.0mm (H)

3) Lamps

	DISPLAY	DESCRIPTION
	POSITION
AMOUNT	1 8
MINUS SIGN	4 10	: Floating
ERROR	10
PGM MODE	10
CA/AT	10	: Lights up when a
NS		registration is finalized by
CH		depressing CA/AT, NS,
CHK		CH or CHK key
SUBTOTAL/	10
SHORT TENDER
CHANGE	10	: Lights up whenever the
		change due amount
		appears in the display.
DEPARTMENT	9 10	No zero-suppressed.
PLU	8 10	No zero-suppressed.
REPEAT	8	Endless count, starting from 2.
DECIMAL POINT	3 1	TAB
LOW BATTERY	10	: Light up when the voltage
		of the battery for memory
		retention is lower than the
		regulated voltage.
		(The voltage is checked
		when "POWER ON" or
		"Batteries are
		exchanged".)
RECEIPT OFF	8	—
CASHIER No.	2 3	– || – : 01 06 code entry
VALIDATION	10	: Light up when the
		validation printing is
		compulsory.
CONVERSION or	10
CALC. MODE

– 3 –

5. Printer

1) Printer specifications

ITEMS								ER-A310															ER-A330
Model name	CR-510															UCR-812A
No. of station	2 (Receipt/Journal)															2 (Receipt/Journal)
Printing system	Inner hammer, rubber character selection type															Print wheel selective type
Printing capacity	Receipt				: Max. 12 chr.											Receipt				: Max. 10 chr.
	Journal				: Max. 12 chr.											Journal				: Max. 10 chr.
	Validation				: Max. 24 chr./1 line											Validation				: Max. 20 chr./1 line
Character size	1.8mm (W) ´ 2.7mm (H)															Figure				: 1.7mm (W) ´ 3.2mm (H)
																Symbol				: 2.4mm (W) ´ 3.2mm (H)
Print pitch	Column distance : 2.8mm															Column distance				: 3.35mm for between 1st and 2nd
																				column 3.0mm for after 3rd column
	Row distance				: 4.3mm											Row distance				: 5.1mm
Print speed	Approx. 3.0 lines/sec.															Approx. 2.6 lines/sec.
Paper feed speed	Approx. 29 lines/sec. at receipt issued.															Approx. 18 lines/sec. at receipt issued.
Reliability	MCBF 2.5 million lines															MCBF 2 million lines
Validation form sensor	No															No
Near end sensor	Journal side: No															Journal side: No
	Receipt side: No															Receipt side: No
Cutter	Manual															Manual
Print wheel layout	Parts code: 00BM755001010															Parts code: 00BM712002300
	12		11	10	9		8	7	6	5	4	3	2	1		10		9		8		7	6	5	4	3	2	1
		PL		GT			–		–		–		CA				PL	Z		TX	.		.	.	.	GT	CA	@
		0	0	0	0		0	0	0	0	0	CD	CH	1¤2			–	–	–		–		–	–	–	#	CK	Q
		1	1	1	1		1	1	1	1	1	P	CK	1												%	CH	CG
		2	2	2	2		2	2	2	2	2	X	CR	2
		3	3	3	3		3	3	3	3	3	Z	EX	3			0	0		0		0	0	0	0	0	RA	TD
		4	4	4	4		4	4	4	4	4	#	TX	4			1	1		1		1	1	1	1	1	PO	1
		5	5	5	5		5	5	5	5	5	RF	FS	5			2	2		2		2	2	2	2	2	VD	2
		6	6	6	6		6	6	6	6	6	VD	%	6			3	3		3		3	3	3	3	3	NS	3
		7	7	7	7		7	7	7	7	7	TR	d	7			4	4		4		4	4	4	4	4	TX	4
		8	8	8	8		8	8	8	8	8	Q	RA	CG			5	5		5		5	5	5	5	5	FS	5
		9	9	9	9		9	9	9	9	9	@	PO	TD			6	6		6		6	6	6	6	6	d	6
												+	NS	TL			7	7		7		7	7	7	7	7	X	1¤2
		–	–	–	–	.		.	.	.	No	–	*	ST			8	8		8		8	8	8	8	8	EX	ST
																	9	9		9		9	9	9	9	9	RF	TL

2) Roll paper

Parts code	DPAPR1006CSZZ
Dimension	44.5±0.5mm in width
	Max. 83mm in diameter
Paper quality	Journal/Receipt
	Fine quality paper
	Paper thickness	: 0.06 to 0.09 mm
	Paper weight	: 52.3 to 64g/m2
	Validation form
	Normal paper only
	Thickness	: 0.09 to 0.14 mm
	Size	: 110mm or more, 210mm or

under (W) ´ 70mm or more (H)

– 4 –

3) Validation paper

ER-A310	ER-A330
Paper quality Normal paper only	Normal paper and pressure sensitive paper only
Thickness : 0.09 to 0.14 mm	Thickness : 0.07 to 0.14 mm
Size : 110 mm or more, 210 mm or under (W) × 70 mm or more (H)	Size : 115 mm or more (W) × 70 mm or more (H)
Printing area

	76.2	14.2		29.4	19.1	29.4	16
32.6	(11)	32.6
			9.3	10Dig.		10Dig.	16.6
				Wide over 115mm

4) Inking

	ER-A310	ER-A330
Parts code	NROLR6652RCZZ	NROLR6638RCZZ
Ink supply system	Ink roller	Ink roller
Form	Roller	Roller
Specification	Material-rubber	Material-rubber
Roller life	Approx. 0.4 million lines	Approx. 0.6 million lines
Print color	Purple	Purple

5) Logo stamp

	ER-A310	ER-A330
Material	Porous rubber	Porous rubber
Size	30mm (W) × 20mm (H)	30mm (W) × 20mm (H)
Color	Purple	Purple
Parts code for ink	UINK1001CCZZ	UINK1001CCZZ

6. Drawer

1) Drawer box and drawer

Model name	SK423
Size	420(W) × 423(D) × 112(H) mm
Color	Light olive gray
Material	Metal
Bell	—
Release lever	Standard equipment; Situated at the bottom
Drawer open sensor	Standard equipment

2) Money case

	For "U" version	For "A" version
Separation from the drawer	Allowed	Allowed
Separation of the coin	Disallowed	Disallowed
compartments from the
money case
Bill separator	—	Yes
Number of compartments	5B/5C	4B/8C

Bill compartments

Bill separator

Coin compartments

5B/5C

4B/8C

3) Lock

Location of the lock	Front
Method of locking	Locking	: Insert the drawer lock key
and unlocking		into the lock and turn it 90
		degrees counterclockwise.
	Unlocking	: Insert the drawer lock key
		into the lock and turn it 90
		degrees clockwise.
Key No.	SK1-1

7. Memory back up

For memory back up, the dry battery ULM-3 (3 pieces) is needed.

1. Memory holding time: Approximate 1 year after NEW dry batteries are inserted.

2. Battery exchange method: When the low battery symbol "L" lights up, batteries (3 pieces) exchange by the following method, within 2 days.

1) Power on the ECR.

2) Turn the MODE SW to "OP X/Z" mode.

3) Release the OLD dry batteries (3 pieces).

4) Insert the NEW dry batteries (3 pieces).

5) Confirm the low battery symbol "L" lights off.

– 5 –

CHAPTER 2. OPTIONS

1. Sales options

No.	NAME	MODEL	DESCRIPTIONS
1	REMOTE DRAWER	ER-04DW	5B/5C
2	COIN CASE	ER-55C2	5B/5C
3	KEY TOP KIT	ER-11KT7	1	× 1 key top
		ER-12KT7	1	× 2 key top
		ER-22KT7	2	× 2 key top
		ER-11DK7	1	× 1 dummy key
		ER-51DK7	5	× 1 dummy key

2. Service options

No.	NAME	PARTS CODE	PRICE RANK	DESCRIPTIONS
1	SRV KEY	LKGIM7113RCZZ	AK
2	MODE KEYGRIP COVER	LKGIM7126RCZZ	AL	OP key only
3	DRIP-PROOF KEYBOARD COVER	GCÇVH7126BHZZ	BE
4	SHIELD PLATE KIT	DKIT-8666BHZZ	BL	Only for ER-A330

3. Supplies

No.	NAME	PARTS CODE	PRICE RANK	DESCRIPTIONS
1	ROLL PAPER	DPAPR1006CSZZ	AR
2	INK ROLLER (ER-A310)	NRÇLR6652RCZZ	AZ
3	INK ROLLER (ER-A330)	NRÇLR6638RCZZ	AY
4	INK FOR STAMP	UINK-1001CCZZ	AK

CHAPTER 3. SRV RESET AND MASTER RESET

The SRV key is used for operating in the SRV mode.

1. SRV. reset (Program Loop Reset)

Used to return the machine back to its operational state after a lockup has occurred.

Procedure

• Method 1

1)Turn off the AC switch.

2)Set the mode switch to (SRV′) position.

3)Turn on the AC switch.

4)Turn to (SRV) position from (SRV′) position.

2. Master reset (All memory clear)

There are two possible methods to perform a master reset.

• MRS-1

Used to clear all memory contents and return machine back to its initial settings. return keyboard back to default. for default keyboard layout.

Procedure-1 (with SRV key)

1)Unplug the AC cord from the wall outlet.

2)Set the MODE switch to the (SRV′) position.

3)Plug in the AC cord to the wall outlet.

4)While holding down JOURNAL FEED key, turn to (SRV) position from (SRV′) position.

Procedure-2 (without SRV key)

1)Turn the mode switch to the (REG) position.

2)Ensure the batteries are not installed in the battery compartment and insert the plug into the outlet.

3)The right most decimal point will blink for a few seconds.

4)The register will sound three beeps.

5) The register will display "

."

– 6 –

CHAPTER 4. HARDWARE DESCRIPTION

1. Block diagram

1) ER-A310

				PRINTER POWER SOURCE : +24V
				DISPLAY POWER SOURCE : +5.5V
TRANSFORMER	VOLTAGE
	REGULATOR			DRIVE SIGNAL
					DRAWER
				DRIVER
DRY BATTERY		DC-DC		DRIVE SIGNAL	BUZZER
				DRIVER
		CONVERTER		TIMING SIGNAL
					STEP MOTOR
					DRIVER
	STROBE			DRIVE SIGNAL
	SIGNAL
			CPU	DRIVE SIGNAL	STAMP, PAPER	PRINTER
KEYBOARD					FEED DRIVER
		µPD78045
8X9 72KEY				HAMMER COMMON SIGNAL		CR-510
			LATCH	DRIVE SIGNAL	HAMMER MG
			SIGNAL		DRIVER
MODE
SWITCH	RETURN
8SIGNAL
	SIGNAL		ADDRESS
			LATCH
		ADDRESS	ADDRESS	DATA BUS
		BUS	BUS
					SEGMENT		POP-UP
CHIP SELECTSIGNAL					DRIVER	OP.	DISPLAY
							7SEG LED
						DISPLAY
							7DIG
			S-RAM			7SEG LED
			256 kbit		DIGIT DRIVER	10DIG
				DIGIT SIGNAL

– 7 –

2) ER-A330
				PRINTER POWER SOURCE : +18V
				DISPLAY POWER SOURCE : +5.5V
TRANSFORMER	VOLTAGE
	REGULATOR			DRIVE SIGNAL
					DRAWER
				DRIVER
DRY BATTERY		DC-DC		DRIVE SIGNAL	BUZZER
				DRIVER
		CONVERTER		TIMING SIGNAL
					STEP MOTOR
					DRIVER
	STROBE			DRIVE SIGNAL
	SIGNAL
			CPU	DRIVE SIGNAL	STAMP, PAPER	PRINTER
KEYBOARD					FEED DRIVER
		µPD78045
8X9 72KEY				HAMMER COMMON SIGNAL		UCR-812A
			LATCH	DRIVE SIGNAL	PRINT WHEEL
			SIGNAL		MG DRIVER
MODE
SWITCH	RETURN
8SIGNAL
	SIGNAL		ADDRESS
			LATCH
		ADDRESS	ADDRESS	DATA BUS
		BUS	BUS
					SEGMENT		POP-UP
CHIP SELECTSIGNAL					DRIVER	OP.	DISPLAY
							7SEG LED
						DISPLAY
							7DIG
			S-RAM			7SEG LED
			256 kbit		DIGIT DRIVER	10DIG
				DIGIT SIGNAL

– 8 –

2. CPU (UPD78045F) pin configuration

No.	PIN NAME		ER-A310		ER-A330	I/O	ACTIVE
		SIGNAL NAME	DESCRIPTION	SIGNAL NAME	DESCRIPTION
1	P94	DIG7	Display digit 7	DIG7	Display digit 7	O	H
2	P93	DIG6	Display digit 6	DIG6	Display digit 6	O	H
3	P92	DIG5	Display digit 5	DIG5	Display digit 5	O	H
4	P91	DIG4	Display digit 4	DIG4	Display digit 4	O	H
5	P90	DIG3	Display digit 3	DIG3	Display digit 3	O	H
6	P81	DIG2	Display digit 2	DIG2	Display digit 2	O	H
7	P80	DIG1	Display digit 1	DIG1	Display digit 1	O	H
8	VDD	VDD	+5V	VDD	+5V
9	P27	AD7	RAM Address & Data bus 7	AD7	RAM Address & Data bus 7	I/O	H
					Printer magnet 8
10	P26	AD6	RAM Address & Data bus 6	AD6	RAM Address & Data bus 6	I/O	H
					Printer magnet 7
11	P25	AD5	RAM Address & Data bus 5	AD5	RAM Address & Data bus 5	I/O	H
			Journal print magnet 6		Printer magnet 6
			Receipt print magnet 6
12	P24	AD4	RAM Address & Data bus 4	AD4	RAM Address & Data bus 4	I/O	H
			Journal print magnet 5		Printer magnet 5
			Receipt print magnet 5
13	P23	AD3	RAM Address & Data bus 3	AD3	RAM Address & Data bus 3	I/O	H
			Journal print magnet 4		Printer magnet 4
			Receipt print magnet 4
14	P22	AD2	RAM Address & Data bus 2	AD2	RAM Address & Data bus 2	I/O	H
			Journal print magnet 3		Printer magnet 3
			Receipt print magnet 3
15	P21	AD1	RAM Address & Data bus 1	AD1	RAM Address & Data bus 1	I/O	H
			Journal print magnet 2		Printer magnet 2
			Receipt print magnet 2
16	P20	AD0	RAM Address & Data bus 0	AD0	RAM Address & Data bus 0	I/O	H
			Journal print magnet 1		Printer magnet 1
			Receipt print magnet 1
17	/RESET	/RESET	Reset signal	/RESET	Reset signal	I	L
18	P74	SCOM	Printer step motor common signal	NU	NU	O	H
19	P73	SM4	Printer step motor drive signal 4	NU	NU	O	H
20	AVSS	AVSS	GND	AVSS	GND
21	P17	KR11	Key return signal 11	KR11	Key return signal 11	I	H
22	P16	KR10	Key return signal 10	KR10	Key return signal 10	I	H
23	P15	KR9	Key return signal 9	KR9	Key return signal 9	I	H
24	P14	KR8	Key return signal 8	KR8	Key return signal 8	I	H
25	P13	KR7	Key return signal 7	KR7	Key return signal 7	I	H
26	P12	KR6	Key return signal 6	KR6	Key return signal 6	I	H
27	P11	KR5	Key return signal 5	KR5	Key return signal 5	I	H
28	P10	P10	Dry battery voltage	P10	Dry battery voltage	I
29	AVDD	AVDD	+5V	AVDD	+5V
30	AVREF	AVREF	+5V (VCC)	AVREF	+5V (VCC)
31	XT1	XT1	Sub clock: 32.768 kHz	P04	Sub clock: 32.768 kHz	I
32	XT2	XT2		XT2		O
33	VSS	VSS	GND	VSS	GND
34	X1	X1	Main clock: 4.19 MHz	X1	Main clock: 4.19 MHz	I
35	X2	X2		X2		O
36	P37	MD	Printer motor ON signal	MD	Printer motor ON signal	O	H
37	P36	BUZ	Buzzer ON signal	BUZ	Buzzer ON signal	O	H/L
38	P35	RF	Receipt paper feed signal	RF	Receipt paper feed signal	O	H
39	P34	JF	Journal paper feed signal	JF	Journal paper feed signal	O	H
40	P33	STAMP	Stamp ON signal	STAMP	Stamp ON signal	O	H

– 9 –

	No.	PIN NAME		ER-A310		ER-A330	I/O	ACTIVE
			SIGNAL NAME	DESCRIPTION	SIGNAL NAME	DESCRIPTION
	41	P32	/ALE	Address latch signal	/ALE	Address latch signal	O	↓
	42	P31	/CE	Chip select signal	/CE	Chip select signal	O	L
	43	P30	/WE	Write signal	/WE	Write signal	O	L
	44	P03	RMS	NU	RMS	NU	I
	45	P02	R	Printer reset signal	DRS	Drawer open sensor	I
	46	P01	T	Printer timing signal	α	Printer timing signal	I	− H
	47	P00	PE	Power enable signal	PE	Power enable signal	I	H
	48	IC	IC	VSS	IC	VSS
	49	P72	SM3	Printer step motor drive signal 3	P72	NU	O	H
	50	P71	SM2	Printer step motor drive signal 2	MG10	Printer magnet 10	O	H
	51	P70	SM1	Printer step motor drive signal 1	MG9	Printer magnet 9	O	H
	52	VDD	VDD	+5V	VDD	+5V
	53	P127	DRS	Drawer open sensor (input)	R-COM	Printer receipt common signal	O	H
	54	P126	HCOM	Printer hammer common signal	J-COM	Printer journal common signal	O	H
	55	P125	J1	Mode signal (ER-A310: GND)	J1	Mode signal (ER-A330: VDD)	I	H
	56	P124	DR1	Standard drawer drive signal	DR1	Standard drawer drive signal	O	H
	57	P123	KR4	Key return signal 4	KR4	Key return signal 4	I	H
	58	P122	KR3	Key return signal 3	KR3	Key return signal 3	I	H
	59	P121	KR2	Key return signal 2	KR2	Key return signal 2	I	H
	60	P120	KR1	Key return signal 1	KR1	Key return signal 1	I	H
	61	P117	A14	RAM Address 14	A14	RAM Address 14	O
	62	P116	A13	RAM Address 13	A13	RAM Address 13	O
	63	P115	A12	RAM Address 12	A12	RAM Address 12	O
	64	P114	A11	RAM Address 11	A11	RAM Address 11	O
	65	P113	A10	RAM Address 10	A10	RAM Address 10	O
	66	P112	A9	RAM Address 9	A9	RAM Address 9	O
	67	P111	A8	RAM Address 8	A8	RAM Address 8	O
	68	P110	DR2	Option drawer drive signal	DR2	Option drawer drive signal	O	H
	69	P107	DP/ST8	Display segment signal DP	DP/ST8	Display segment signal DP	O	H
				Key strobe signal 8		Key strobe signal 8
	70	P106	G/ST7	Display segment signal G	G/ST7	Display segment signal G	O	H
				Key strobe signal 7		Key strobe signal 7
	71	VLOAD	VLOAD	VSS	VLOAD	VSS
	72	P105	F/ST6	Display segment signal F	F/ST6	Display segment signal F	O	H
				Key strobe signal 6		Key strobe signal 6
	73	P104	E/ST5	Display segment signal E	E/ST5	Display segment signal E	O	H
				Key strobe signal 5		Key strobe signal 5
	74	P103	D/ST4	Display segment signal D	D/ST4	Display segment signal D	O	H
				Key strobe signal 4		Key strobe signal 4
	75	P102	C/ST3	Display segment signal C	C/ST3	Display segment signal C	O	H
				Key strobe signal 3		Key strobe signal 3
	76	P101	B/ST2	Display segment signal B	B/ST2	Display segment signal B	O	H
				Key strobe signal 2		Key strobe signal 2
	77	P100	A/ST1	Display segment signal A	A/ST1	Display segment signal A	O	H
				Key strobe signal 1		Key strobe signal 1
	78	P97	DIG10	Display digit signal 10	DIG10	Display digit signal 10	O	H
	79	P96	DIG9	Display digit signal 9	DIG9	Display digit signal 9	O	H
	80	P95	DIG8	Display digit signal 8	DIG8	Display digit signal 8	O	H

– 10 –

3. RAM control
		/CE
		/WE
		A8~A14
IC2	/ALE			IC14
CPU
		IC3	A0~A7	S-RAM
	AD0~AD7	74HC373
			AD0~AD7

/WE:	Write signal
	When the signal is low, writing is performed. When the
	signal is high, reading is performed.
/CE:	Chip select signal
A8-A14:	Address bus
AD0-7:	Address/Data bus
A0-1:	Address bus signal
/ALE:	Address latch signal

Address signals A0-A7 are used commonly with the data bus. When the address latch signal /ALE is input to IC3, the address/data bus signal AD0-AD7 access the RAM as address signals A0-A7.

(READ)

As shown in the attached time chart, address signals are outputted from P20-P27, P111-P117, and the lower address is latched with

P32. The modes at P20-P27 are changed to the input mode. The chip enable signal (P31) is output for the RAM. Then the output data from the RAM are read from P20-P27.

RAM control

(READ cycle)

P111~P117	Upper address

	P20~P27		Lower address	RAM data output
		15ns or above		0ns or above
		Lower address	15ns or
	P32			70ns or above
		latch signal	above

30ns or above

P30 RAM /WE Fixed to HIGH.

RAM /OE Fixed to LOW

P31 RAM /CS

P20~P27 READ timing

70ns or above

Input

P20~P27 Select

Output

Hammer common

(WRITE)

As shown in the attached time chart, address signals are outputted from P20-P27, P111-P117, and the lower address is latched with P32. The write enable signal (P30) is output. The write data to the RAM are output from P20-P27. Then the chip enable signal (P31) is output to write the data.

RAM control

(WRITE cycle)

P111~P117

Upper address

P20~P27

Lower address

Input data to RAM

15ns or above

30ns or above

Lower address

15ns or

P32

0ns or above

latch signal

above

30ns or above

P30

RAM /WE

50ns or above

RAM /OE

Fixed to LOW.

P20~P27

RAM /CS

P20~P27

0ns or

60ns or

READ timing

above

above

Input

P20~P27 Select

Output

RAM Data IN

Hammer common

4. Printer control circuit (ER-A310)

1) Printer motor drive circuit

VP : +24V

M

Q17

C3784

IC2

CPU

R60

MD

R61

The motor drive signal MD from the CPU is used to operate the printer motor with switching operation of transistor Q17.

– 11 –