Sharp ER-A310, ER-A330 User Manual

ER-A310

ER-A330

SERVICE MANUAL

CODE: 00ZERA310USME

ELECTRONIC CASH REGISTER

MODEL 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. Appearanc e/Rat ing

1) Appearance

1 ER-A310

Journal paper

Printer cover

Receipt paper

Drawer lock

Customer display (Pop-up type)

Operator display

Mode sw i t c h

Keyboard

Drawer

2 ER-A330

Journal paper Printer cover

Receipt paper

Drawer lock

2) Rating

ER-A310 ER-A330 Power source 120V AC ± 10%, 50/60 Hz Power

consumption Operating

temperature Operating

humidity Physical

dimensions, including the drawer

Weight 12.5 kg (27.6 lbs.) 13.5 kg (30.0 lbs.)

Stand-by: 10W Operating: 31W (Max.)

32˚F to 104˚F (0˚C to 40˚C)

10% to 90% (RH)

420 (W) × 423 (D) × 304 (H) mm (16.5 (W) × 16.7 (D) ×

12.0 (H) in.)

Stand-by: 10W Operating: 38W (Max.)

420 (W) × 423 (D) × 314 (H) mm (16.5 (W) × 16.7 (D) ×

12.4 (H) in.)

Customer display (Pop-up type)

Operator display

Mode switch

Keyboard

Drawer

– 1 –

2. Keyboard

1) Standard keyboard layout

1 ER-A310

PLU/SUB NS ESC AUTO

JOURNAL

RECEIPT

RCPT PRINT

CAL

FOR

RFND

VOID

Dummy key Dummy key Dummy key

987

654

321

00 

2 ER-A330

CASH

JOURNA L

RECEIPT

RCPT PRINT

1 2

%1 %2

FOR

RFND

VOID

Dummy key Dummy key

00 

987



654

321

2) Key top name

1 Standard key top

KEY TOP DESCRIPTION ER-A310 ER-A330

↑ RECEIPT Receipt paper feed key

↑ JOURNAL Journal paper feed key

0∼9,00 Numeric keys

⋅Decimal point key

@/FOR Multiplication key

CL/C Clear key

PRINT Validation print key

Dept.1/+ Department 1/Plus key

Dept.2/– Department 2/Minus key Dept.3/× Dept.4/÷ Department 4/Division key

Dept.5∼8 Department 5∼8 keys

Dept.5∼10 Department 5∼10 keys

PLU/SUB PLU/Subdepartment key

ESC Error escape key

CASH# Cashier number entry key

RCPT Receipt print key

dDiscount key

d1, 2 Discount 1 and 2 keys

AUTO Automatic sequencing key

AUTO1, 2

% Percent key

Department 3/ Multiplication key

Automatic sequencing 1 and 2 keys



PLU

NS ESC

SUB

CAL

CONV

AUTO

èè

èÉ

Éè

èè

Éè

èè

èÉ

Éè

èÉ

Éè

èÉ

CH CONV

MDSE

CHK

SBTL

#/TM/SBTL

CA/AT

SHIFTFSTEND

CH1

CH2

MDSE

CHK

SBTL

#/TM/SBTL

CA/AT

KEY TOP DESCRIPTION ER-A310 ER-A330

%1, 2 Percent 1 and 2 keys

NS No-sale key

RA/RM

PO/CAL

Received on account/ Recall memory key

Paid out/ Calculation mode key

RFND Refund key

VOID Void key

CH Charge key

CH1, 2 Charge 1 and 2 keys

CHK Check key

CONV Conversion key

MDSE SBTL Merchandise subtotal key

#/TM/SBTL

CA/AT /=

Non-add code/Time display/ Subtotal key

Cash/Amount tendered/

Equals key FS SHIFT Food stamp shift key FS TEND Food stamp tender key

Éè

èè

èÉ

Éè

èè

Éè

2Optional key top

KEY TOP DESCRIPTION ER-A310 ER-A330

Dept. 9∼30 Department 9∼30 keys

Dept. 11∼50 Department 11∼50 keys

DEPT#

TAX1

Department number entry key

Tax1 ∼ Tax4 shift keys

SHIFT∼TAX4

SHIFT

TAX Manual tax key

AUTO2

AUTO3, 4

Automatic sequencing 2 key

Automatic sequencing 3 and 4 keys

CONV2∼4 Conversion 2∼4 keys

CA2 Cash total 2 key CH2 Charge 2 key

d2 Discount 2 key %2 Percent 2 key

èÉ

Éè

èè

èÉ

Éè

èè

èÉ

– 2 –

4. Display

1) Operator display

PLU/SUB

DEPT REPEAT

RCPT OFF

: This appears w hen a transa c tion is final ize d.

: This a ppears 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)

3) Lamps

DISPLAY

POSITION AMOUNT 1 ∼ 8 MINUS SIGN 4 ∼ 10 : Floating ERROR 10 PGM MODE 10 CA/AT

10 : Lights up when a NS CH CHK

SUBTOTAL/

10 SHORT TENDER

CHANGE 10 : Lights up whenever the

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

RECEIPT OFF 8 — CASHIER No. 2 ∼ 3– || – : 01 ∼ 06 code entry VALIDATION 10 : Light up when the

CONVERSION or

10 CALC. MODE

DESCRIPTION

registration is finalized by depressing CA/AT, NS, CH or CHK key

change due amount appears in the display.

of the battery for memory retention is lower than the regulated voltage. (The voltage is checked when "POWER ON" or "Batteries are exchanged".)

validation printing is compulsory.

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 –

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

121110987654321 PL GT –––CA

000000000CD CH1⁄ 111111111PCK 1 222222222XCR 2 333333333ZEX 3 444444444#TX 4 555555555RF FS 5 666666666VD %6 777777777TR d 7 888888888QRA CG 999999999@PO TD

★★★★★★★★★+NS TL

– – – – . . . . No – * ST

10987654321

PL Z TX . . . . GT CA @

–––––––#CK Q

★★★★★★★%CH CG

00000000RA TD 11111111PO 1 22222222VD 2 33333333NS 3 44444444TX 4 55555555FS 5 66666666d6 77777777X1⁄ 88888888EX ST 99999999RF 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/m 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

32.6

(11)

32.6

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

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

14.2

19.1

29.4 29.4

9.3

10Dig.

Wide over 115mm

10Dig.

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

3) Lock

Location of the lock Front Method of locking

and unlocking

Key No. SK1-1

Locking : Insert the drawer lock key

into the lock and turn it 90 degrees counterclockwise.

Unlocking : Insert the drawer lock key

into the lock and turn it 90 degrees clockwise.

16.6

2) Money case

For "U" version For "A" version Separation from the drawer Allowed Allowed Separation of the coin

compartments from the money case

Bill separator — Yes Number of compartments 5B/5C 4B/8C

5B/5C

Disallowed Disallowed

Bill compartments

Bill separator

Coin compartments

4B/8C

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 optio ns

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 diagra m

1) ER-A310

PRINTER POWER SOURCE : +2 4V

TRANSFOR ME R

DRY BATTE RY

KEYBOARD

8X9 72KEY

MODE

SWITCH

8SIGNAL

CHIP SELECTSIGNAL

VOLTAGE

REGULATOR

CONVERTER

STROBE SIGNAL

RETURN SIGNAL

DC-DC

ADDRESS BUS

CPU

µPD78045

LATCH

SIGNAL

ADDRESS BUS

S-RAM

256 kbit

DRIVE SIGNAL

ADDRESS

LATCH

TIMING SIGNAL

DRIVE SIGNAL

HAMMER COMMON SIGNAL

DATA BUS

DISPLAY POWER SOURCE : +5.5V

DRIVER DRAWER

DRIVER

BUZZER

STEP MOTOR

DRIVER

STAMP, PAPER

FEED DRIVER

DRIVE SI GNAL

HAMMER M G

DRIVER

SEGMENT DRIVER

DIGIT DRIVER

DIGIT SIGNAL

PRINTER

CR-51 0

OP.

DISPLAY

7SEG LED

10DIG

POP-UP

DISPLAY

7SEG LED

7DIG

– 7 –

2) ER-A330

PRINTER POWER SOURCE : +18V

TRANSFOR ME R

DRY BATTE RY

KEYBOARD

8X9 72KEY

MODE

SWITCH

8SIGNAL

CHIP SELECTSIGNAL

VOLTAGE

REGULATOR

CONVERTER

STROBE SIGNAL

RETURN SIGNAL

DC-DC

ADDRESS BUS

CPU

µPD78045

LATCH

SIGNAL

ADDRESS BUS

S-RAM

256 kbit

DRIVE SIGNAL

ADDRESS

LATCH

TIMING SIGNAL

DRIVE SIGNAL

HAMMER COMMON SIGNAL

DATA BUS

DISPLAY POWER SOURCE : +5.5V

DRIVER DRAWER

DRIVER

BUZZER

STEP MOTOR

DRIVER

STAMP, PAPER

FEED DRIVER

DRIVE SI GNAL

PRINT WHEEL

MG DRIVER

SEGMENT DRIVER

DIGIT DRIVER

DIGIT SIGNAL

PRINTER

UCR-81 2A

OP.

DISPLAY

7SEG LED

10DIG

POP-UP

DISPLAY

7SEG LED

7DIG

– 8 –

2. CPU (UPD78045F ) pin conf igu r ati on

No. PIN NAME

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

10 P26 AD6 RAM Address & Data bus 6 AD6 RAM Address & Data bus 6 I/O H

11 P25 AD5 RAM Address & Data bus 5 AD5 RAM Address & Data bus 5 I/O H

12 P24 AD4 RAM Address & Data bus 4 AD4 RAM Address & Data bus 4 I/O H

13 P23 AD3 RAM Address & Data bus 3 AD3 RAM Address & Data bus 3 I/O H

14 P22 AD2 RAM Address & Data bus 2 AD2 RAM Address & Data bus 2 I/O H

15 P21 AD1 RAM Address & Data bus 1 AD1 RAM Address & Data bus 1 I/O H

16 P20 AD0 RAM Address & Data bus 0 AD0 RAM Address & Data bus 0 I/O H

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

SIGNAL NAME DESCRIPTION SIGNAL NAME DESCRIPTION

ER-A310 ER-A330

Printer magnet 8

Printer magnet 7

Journal print magnet 6 Printer magnet 6 Receipt print magnet 6

Journal print magnet 5 Printer magnet 5 Receipt print magnet 5

Journal print magnet 4 Printer magnet 4 Receipt print magnet 4

Journal print magnet 3 Printer magnet 3 Receipt print magnet 3

Journal print magnet 2 Printer magnet 2 Receipt print magnet 2

Journal print magnet 1 Printer magnet 1 Receipt print magnet 1

I/O ACTIVE

– 9 –

No. PIN NAME

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

70 P106 G/ST7 71 VLOAD VLOAD VSS VLOAD VSS

72 P105 F/ST6

73 P104 E/ST5

74 P103 D/ST4

75 P102 C/ST3

76 P101 B/ST2

77 P100 A/ST1 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

SIGNAL NAME DESCRIPTION SIGNAL NAME DESCRIPTION

ER-A310 ER-A330

Display segment signal DP Key strobe signal 8 Key strobe signal 8 Display segment signal G Key strobe signal 7 Key strobe signal 7

Display segment signal F Key strobe signal 6 Key strobe signal 6 Display segment signal E Key strobe signal 5 Key strobe signal 5 Display segment signal D Key strobe signal 4 Key strobe signal 4 Display segment signal C Key strobe signal 3 Key strobe signal 3 Display segment signal B Key strobe signal 2 Key strobe signal 2 Display segment signal A Key strobe signal 1 Key strobe signal 1

DP/ST8

G/ST7

F/ST6

E/ST5

D/ST4

C/ST3

B/ST2

A/ST1

Display segment signal DP

Display segment signal G

Display segment signal F

Display segment signal E

Display segment signal D

Display segment signal C

Display segment signal B

Display segment signal A

I/O ACTIVE

– 10 –

3. RAM control

P111~P117

P20~P27

P32

P30

RAM /OE

P20~P27

RAM Data IN

RAM control

(WRITE cycle)

Upper address

Lower address

Input data to RAM

15ns or above

30ns or above

0ns or above

Lower address latch signal

30ns or above

50ns or above

Fixed to LOW.

0ns or above

60ns or aboveREAD timing

Select

Input

Output

Hammer common

RAM /WE

RAM /CS

P20~P27

VP : +24V

R60

R61

Q17

C3784

IC2

CPU

/CE

/WE

A8~A14

(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.

IC2

CPU

/ALE

AD0~AD7

IC3

74HC373

A0~A7

AD0~AD7

IC14

S-RAM

/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

P20~P27

Lower address

P32

latch signal

P30

RAM /WE

RAM /OE

P31

RAM /CS

P20~P27

Select

Hammer common

15ns or above

30ns or above

Fixed to HIGH.

Fixed to LOW

READ timing

Input Output

Upper address

Lower address

70ns or above

15ns or above

RAM data output

70ns or above

4. Printer control circuit (ER-A310)

1) Printer motor drive circuit

0ns or above

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

– 11 –

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