Digi DS-685L Series, DS-685F Series Service Manual

SERVICE MANUAL

Model: DS-685L/F Series

Edition Month Year

1st March 1996

2nd May 1996

3rd April 1997
4th March 2002
5th

SHANGHAI TERAOKA ELECTRONIC CO., LTD. --- Technical Service Dept.

Ting Lin Industrial Development Zone, Jin Shan District, Shanghai P. R. China 201505

Tel: [phone] Fax: [phone] E-Mail:

[e-mail]

DS-685L/F Service Manual Revised

CONTENT

1. General Specification

1.1. Model Specification --------------------------------------------------------------------- 1

1.2. Features ----------------------------------------------------------------------------------- 1

1.3. Overall View ------------------------------------------------------------------------------ 2

1.4. Dimension --------------------------------------------------------------------------------- 3

1.5. Key-Sheet Layout ----------------------------------------------------------------------- 4

1.6. Key Function ----------------------------------------------------------------------------- 4

1.6.1. Type A (8 Preset Keys) ---------------------------------------------------------- 4

1.6.2. Type B (14 Preset Keys) -------------------------------------------------------- 4

1.7. Operation Condition -------------------------------------------------------------------- 5

1.8. Charging Condition (For Rechargeable Battery Only) ------------------------- 5

1.9. Analog Specification ------------------------------------------------------------------- 5

1.10. Main Components Used ------------------------------------------------------------- 5

1.11. Capacity / Minimum Graduation / Tare Range --------------------------------- 6

1.11.1. DS-685L --------------------------------------------------------------------------- 6

1.11.2. DS-685F --------------------------------------------------------------------------- 6

2. Maintenance Mode

2.1. SPAN SW Location & Stopper Screws ------------------------------------------- 7

2.2. Internal Count & A/D Count Display ----------------------------------------------- 7

2.3. SPAN Adjustment ---------------------------------------------------------------------- 8

2.4. Escape From Calibration Mode ----------------------------------------------------- 8

2.5. Specification Setting Operation ----------------------------------------------------- 9

2.5.1. User Specification Setting (141) ----------------------------------------------- 9

2.5.2. Specification Entry (142) -------------------------------------------------------- 9

2.6. DS-685L Specification List (V1.26) ------------------------------------------------ 10

2.6.1. Customer Specification List (141) V1.26 ------------------------------------ 10

2.6.2. Weight & Measure Specification List (142) V1.26 ------------------------- 10

2.7. DS-685F Specification List (V1.06) ------------------------------------------------- 12

2.7.1. User Specification List (141) V1.06 ------------------------------------------- 12

2.7.2. For Weight & Measure (142) V1.06 ------------------------------------------- 12

2.8. Location of Sealing Screw ------------------------------------------------------------ 14

3. Error Message ------------------------------------------------------------------------------- 15

4. Hardware Detail

4.1. DS-685L ----------------------------------------------------------------------------------- 16

4.1.1. NRFI Electrical Connection Block Diagram --------------------------------- 16

1

DS-685L/F Service Manual Revised

4.1.2. RFI Electrical Connection Block Diagram ----------------------------------- 16

4.1.3. Microcomputer Pin Assignment ------------------------------------------------ 17

4.2. DS-685F ----------------------------------------------------------------------------------- 19

4.2.1. NRFI Electrical Connection Block Diagram --------------------------------- 19

4.2.2. RFI Electrical Connection Block Diagram ----------------------------------- 19

4.2.3. Microcomputer Pin Assignment ------------------------------------------------ 20

5. Circuitry Diagram ---------------------------------------------------------------------------- 22

2

CONTENT

I. INTRODUCTION

1. Feature ........................................................................................................ I-1

II. SPECIFICATION

1. General specification

1.1 Overall view ................................................................................. II-1

1.2 Dimension ................................................................................. II-2

1.3 Model specification ..................................................................... II-3

1.4 Operation condition ……………………………………………… II-3

1.5 Main components used ……………………………………………… II-3

1.6 Capacity / Minimum graduation / Tare range ……………………… II-4

III. INITIAL SETUP

1. Specification setting

1.1 Specification entry (141) ..................................................................... III-1

1.2 Specification entry (142) ..................................................................... III-2

1.3 Specification list of DS-685 (Version 1.21) ……................................... III-3

1.4 Specification list of DS-685F (Version 1.00) …………………………..
III-6

2. Key layout and function

2.1 8 preset key type ..................................................................... III-9

3. Location of sealing screw ................................................................................. III-11

4. Set up procedure ………................................................................................. III-11

IV. ADJUSTMENTS

1. Span enable switch setting ................................................................................. IV-1

2. Internal count and A/D count ...................................................................... IV-1

3. Span adjustment ............................................................................................. IV-1

4. Escape from maintenance mode ...................................................................... IV-2

5. Error message ............................................................................................. IV-3

V. ELECTRICAL CIRCUITRY

1. DS-685

2. DS-685F

DS-685L/F Series Service Manual

Page No. 1

1. General Specification

1.1. Model specification

z Model Name: DS-685L / DS-685F
z Display Resolution: 1/3,000
z Internal Resolution: 1/30,000 (DS-685)

1/60,000 (DS-685F)

z Platter Size: 300mm x 225mm (11.8” x 8.8”)
z Display: Double-sided display

A) LCD display version

Weight - 5 digits
Unit Price - 5 digits / - 6 digits (1 fixed zero) / - 7 digits (2 fixed zeros)
Total Price - 6 digits / - 7 digits (1 fixed zero) / - 8 digits (2 fixed zeros)

B) FIP display version

Weight display - 5 digits
Unit price display - 5 digits
Total price display - 6 digits

1.2. Features

DS-685 offers the following features:

z Low cost digital price computing scale
z Quick response to weight changes
z Capacity: 3kg, 6kg, 15kg, 30kg, 30lb
z Resolution:

A) DS-685 (LCD display): Display resolution 1/3,000, Internal resolution 1/30,000.
B) DS-685F (FIP display): Display resolution 1/3000, Internal resolution 1/60,000.

z Low power consumption:

A) DS-685 (LCD display): 6 x D size dry battery back up for more than 500 hours of

continuous usage.

B) DS-685F (FIP display): Rechargeable battery backup for 8 hours of continuous

usage. (Optional)

z Battery low detection

A) DS-685L (LCD Display)

Two –Point lower detect for Dry Battery
* When battery is weak, the battery indicator will light up.
* When the power from battery becomes lower, scale cannot compute accurately,

all display will shut off except the battery indicator. The power is then shut off
completely after 1 minute.

DS-685L/F Series Service Manual

Page No. 2

B) DS-685F (FIP Display)

Four-Point battery status detect (Rechargeable battery)
* When battery is weak, the battery indicator will light up.
* When the power from battery becomes lower, scale cannot compute accurately,

all displays will shut off except the battery indicator. The power is then shut off

completely after 1 minute.
* When battery needs to charge and AC power available, battery will be charged.
* Automatically stop charging when battery is fully charged.

z Calibration by software
z Splash water proof
z Customer and operator displays (optional customer pole display)
z 30 keys: ON/OFF key, 10 Numeric keys, 11/5 Operational keys, 8/14 Preset keys
z Plastic housing
z Display Tube:

DS-685L: High contrast LCD display
DS-685F: FIP display

1.3. Overall view

DS-685 Bench type DS-685 Pole type

DS-685L/F Series Service Manual

Page No. 3

1.4. Dimension

DS-685 Bench type

DS-685 Pole type

DS-685L/F Series Service Manual

Page No. 4

1.5. Key-Sheet Layout

Keysheet Type A

Keysheet Type B

1.6. Key Function

1.6.1. Type A (8 Preset Keys)

: ON/OFF key. Turn the power ON or OFF.

to

: PRESET keys. Set up or call either unit price.

to

: Numeric keys. Input numeric value.
: TARE key. Set or clear tare value.
: CLEAR key. Clear numerical values.
: AUTO key. Select whether or not to clear a unit price (and/or) tare value.
: Multiple key, Register the same non-weighing product multiple times.
: HOLD key. Holds the display value for 8 seconds.
: MINUS key. Correction operation on products.
: AMT/TEND key. Used to enter amount tendered. Two different types of AMT/TEND

operation can be selected by SPEC 9 BIT 3.

: PLUS key. Adds sum, accumulated sum.
: RE-ZERO key. Resets weight display to zero.
: MODE SET key. Switch into following modes: Program & Grand Total Check Mode.
: Data Setting key. Set up or clear mode.

1.6.2. Type B (14 Preset Keys)

: ON/OFF key. Turn the power ON or OFF.

to

: PRESET keys. Set up or call either unit price.

to

: Numeric keys. Input numerical value.
: TARE key. Set or clear tare value.
: CLEAR key. Clear numerical values.
: RE-ZERO key. Resets weight display to zero.
: MODE SET key. Switch into Program Mode.
: Data Setting key. Set up or clear mode.

DS-685L/F Series Service Manual

Page No. 5

1.7. Operation Condition

z Power source

a) DS-685L: AC 240/230/220V, 117/100V (+10%, -15%) (Factory Set)

DC 6 x D size dry battery (9V)

b) DS-685F: AC 240/230/220V, 117/100V (+10%, -15%) (Factory Set)

DC 12V 3Ah rechargeable battery (optional)

z Operating Temperature: -10

o

C to +40oC

z Operating Humidity: 15% to 85% RH
z Power Consumption

a) DS-685L: 1.5W for AC Power / 0.1W for Dry Battery
b) DS-685F: 18W for AC Power / 3.6W for Rechargeable Battery

1.8. Charging Condition (For Rechargeable Battery Only)

a) DS-685L

Power Source: DC 8V from charger
Charging Current: 800mA
Charging Time: 12 ~ 14 hours

b) DS-685F

Power Source: AC 240/230/220V, 117/100V. (Factory set)
Charging Current: 800mA

Charging Time: 18 ~20 hours

1.9. Analog Specification

z Input Sensitivity: 1mV/V
z Zero Adjustment Range: 0 ~+/-2.5mV
z Zero Balance Range: 0 ~ +/-0.5mV
z L/C Exciting Voltage: DC 5V
z A/D Conversion Speed: 3 times/sec
z Internal Resolution: 1/30,000 (DS-685L), 1/60,000 (DS-685F)

1.10. Main components used

z Microcomputer:

DS-685L:

NEC uPD75308GF (4 Bit, 8K PROM) or NEC Upd75304GF (4Bit, 4K ROM)

DS-685F:

NEC uPD75P216ACW (4 BIT 16K PROM) or NEC uPD75212ACW (4 BIT 12K ROM)

z Crystal Oscillator: 4.19 MHz
z Display Device:

DS-685L: Liquid Crystal Display (LCD)
DS-685F: Vacuum Fluorescent Display (FIP)

z Load Cell: 1K resistance load cell (OIML)

DS-685L/F Series Service Manual

Page No. 6

1.11. Capacity / Minimum Graduation / Tare Range

1.11.1. DS-685L
* Single interval

Capacity Minimum Graduation Tare Range

3 kg

1g (1e = 10IR) 0 - 1.499kg

6 kg

2g (1e = 10IR) 0 - 2.998kg

15 kg

5g (1e = 10IR) 0 - 7.495kg

30 kg

10g (1e = 10IR) 0 - 14.99kg

30 lb

0.01lb (1e = 10IR) 0 - 14.99lb

* Multi-interval

Capacity Minimum Graduation Tare Range

3 kg

1g (1e = 10IR) 0 - 1.499kg

6 kg

(0 - 3 kg) - 1g (1e = 5IR) (3 - 6 kg) - 2g (1e = 10IR) 0 - 2.999kg

15 kg

(0 - 6 kg) - 2g (1e = 4IR) (6 - 15 kg) - 5g (1e = 10IR) 0 - 5.998kg

30 kg

(0 - 15 kg) - 5g (1e = 5IR) (15 - 30 kg) - 10g (1e = 10IR) 0 - 9.995kg

30 lb

(0 - 15 lb) - 0.005lb (1e = 5IR) (15 - 30 lb) - 0.01lb (1e = 10IR) 0 - 9.995lb

Note: IR = Internal Resolution, e = division (minimum increment)

Internal count (full capacity) = 30000IR

1.11.2. DS-685F
* Single interval

Capacity Minimum Graduation Tare Range

3 kg

1g (1e = 20IR) 0 - 1.499kg

6 kg

2g (1e = 20IR) 0 - 2.998kg

15 kg

5g (1e = 20IR) 0 - 7.495kg

30 kg

10g (1e = 20IR) 0 - 14.99kg

30 lb

0.01lb (1e = 20IR) 0 - 14.99lb

* Multi-interval

Capacity Minimum Graduation Tare Range

3 kg

1g (1e = 10IR) 0 - 1.499kg

6 kg

(0 - 3 kg) - 1g (1e = 10IR) (3 - 6 kg) - 2g (1e = 20IR) 0 - 2.999kg

15 kg

(0 - 6 kg) - 2g (1e = 8IR) (6 - 15 kg) - 5g (1e = 20IR) 0 - 5.998kg

30 kg

(0 - 15 kg) - 5g (1e = 10IR)
(15 - 30 kg) - 10g (1e = 20IR)

0 - 9.995kg

30 lb

(0 - 15 lb ) - 0.005lb (1e = 10IR)
(15 - 30 lb) - 0.01lb (1e = 20IR)

0 - 9.995lb

Note: IR = Internal Resolution, e = division (minimum increment)
Internal count (full capacity) = 60,000IR

DS-685L/F Series Service Manual

2. Maintenance Mode

2.1. SPAN SW Location & Stopper Screws

Before setting up of DS-685, remove the “LOADCELL STOPPER” from the bottom of
the scale as shown in the diagram below.

Hole For SPAN Switch

Load Cell Stoppers

Please remove the “ Load Cell Stoppers”, before processing for calibration:

1. Place platter on the platter support.

2. Turn on the scale power supply and check the scale functional.

3. Before calibration, use a small insulate rod to switch on the SPAN-SW, which is at
the bottom of the scale (as shown above diagram).

4. Refer to Calibration Operation for further detail.

2.2. Internal Count & A/D Count Display

1 - ZERO 2 - NET 3 - HOLD 4 - AUTO 5 - MEMORY 6 - BATTERY

Operation Weight U. Price T. Price 1 2 3 4 5 6 Remarks

[Re-Zero] + [0] [0] [9] 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

Enter 0 0 9 while
depressing [Re-Zero]

D S 6 8 5 4 8 9 0 0

U.Price window display
A/D count, Total Price
window displays Internal
Count

[ T ] 0.0 0 0 0.0 0 0.0 0

'T' key back to Weighing
mode

a) Please make sure that nothing has been placed on the platter during internal count checking.
b) In order to call up the internal count mode, enter [0] [0] [9] while depressing [Re-Zero] key.
c) The display shows count in the “UNIT PRICE” column for A/D data count and “TOTAL PRICE”

column for internal count.

Page No. 7

DS-685L/F Series Service Manual

z DS-685L

Zero internal count should be 4,800 +/- 300, if you can not get 4,800 +/- 300 count, do span
adjustment again.

z DS-685F

Zero internal count should be 9,600 +/- 300, if you can not get 9,600 +/- 300 count, do span
adjustment again.

d) Depress “ T “ key to exit “INTERNAL COUNT AND A/D COUNT” mode.

2.3. SPAN Adjustment

1 - ZERO 2 - NET 3 - HOLD 4 - AUTO 5 - MEMORY 6 - BATTERY

Operation Weight U. Price T. Price 1 2 3 4 5 6 Remarks

0.0 0 0 0. 0 0 0.0 0

Weighing mode

SPAN Switch ON D S 6 8 5 V r x. x x S - O n
8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

Enter 8 7 1 5 while
depressing [Re-Zero]

[Re-Zero] + [8][7][1][5] C A L 0 0

[ * ] - - - - -

Ensure no weight on
platter, Calibrating zero
point

After few second CALSP

Put full capacity weight on
platter (e.g. 15kg)

Load Weight [ * ] - - - - -

Calibrating Span

After calibration 1 5.0 0 0 0.0 0 0.0 0

Back to Weighing mode

2.4. Escape Form Calibration Mode

1 - ZERO 2 - NET 3 - HOLD 4 - AUTO 5 - MEMORY 6 - BATTERY

Operation Weight U. Price T. Price 1 2 3 4 5 6 Remarks

0.0 0 0 0. 0 0 0.0 0

Weighing mode

SPAN Switch ON D S 6 8 5 V r x. x x S - O n
[T] 0.0 0 0 0. 0 0 0.0 0

Escape to Weighing
mode

SPAN Switch ON D S 6 8 5 V r x. x x S - O n
[Re-Zero] + [8][7][1][5] 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

Enter 8 7 1 5 while

pressing [Re-Zero]
C A L 0 0
[T] 0.0 0 0 0. 0 0 0.0 0

Escape
SPAN Switch ON D S 6 8 5 V r x. x x S - O n

[Re-Zero] 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8

Enter 8 7 1 5 while

pressing
[Re-Zero] + [8][7][1][5] C A L 0 0

[RE-ZERO]
Ensure no weight on

platter, [ * ]

- - - - -

Calibrating zero point

C A L S P

[ T ] 0.0 0 0 0. 0 0 0.0 0

Escape to Weighing

mode

Page No. 8

DS-685L/F Series Service Manual

2.5. Specification Setting Operation

2.5.1. User Specification Setting (141)

1 - ZERO 2 - NET 3 - HOLD 4 - AUTO 5 - MEMORY 6 - BATTERY

Operation Weight U. Price T. Price Remarks

[Re-Zero]+[1][4][1]

S P C 0 0

0 0 0 0

0 0 0 0 Enter [1] [4] [1] while depressing [Re-

Zero]

[+] S P C 0 1 0 0 0 0 0 0 0 0 [+] Key only increase specification

count, It does not update spec data

[-] S P C 0 0 0 0 0 0 0 0 0 0 [-] Key only decrease specification

count, it does not update spec data

[0][1][0][1] S P C 0 0 0 0 0 0 0 1 0 1 Only [1] & [0] key are enable
[*] S P C 0 1 0 0 0 0 0 0 0 0 [*] Key to store specification
[-] S P C 0 0 0 1 0 1 0 0 0 0
[T] 0.0 0 0 0.0 0 0.0 0 Store SPECS to EEPROM & escape

to weighing mode

Note: For 12 Preset-Keys type, please press preset-key 12# instead of [+] key, and

press preset-key 11# instead of [-] key.

2.5.2. Specification entry (142)
Note: It can only work when SPAN SWITCH is on (Enable)

Operation Weight U. Price T. Price Remarks

[Re-Zero]+[1][4][2] S P C 0 8 0 0 0 0 0 0 0 0

Enter [1][4][2] while depressing
[Re-Zero]

[+] S P C 0 9 0 0 0 0 0 0 0 0 [+] key only increase spec number
[+] S P C 1 0 0 0 0 0 0 0 0 0 it does not update spec data
[1][0][1][1] S P C 1 0 0 0 0 0 1 0 1 1 only [1] & [0] KEY are enable
[*] S P C 1 1 0 0 0 0 0 0 0 0 [*] to store specification

[-] S P C 1 0 1 0 1 1 0 0 0 0

[-] key only decrease specification
number, does not update Spec
data

[+] S P C 1 1 0 0 0 0 0 0 0 0
[1][1][1][1] S P C 1 1 0 0 0 0 1 1 1 1
[C] S P C 1 1 0 0 0 0 0 0 0 0
[1][0][1][0] S P C 1 1 0 0 0 0 1 0 1 0
[*] S P C 1 2 0 0 0 0 0 0 0 0 [*] KEY to store specification
[+] S P C 1 3 0 0 0 0 0 0 0 0

[T] 0.0 0 0 0.0 0 0.0 0

Store SPECS to EEPROM &
escape to weighing mode

Note: For 12 Preset-Keys type, please press preset-key 12# instead of [+] key, press

preset-key 11# instead of [-] key.

Page No. 9

DS-685L/F Series Service Manual

2.6. DS-685L Specification list (Version 1.26)

2.6.1. Customer Specification List (1 41) V1.26

SPEC Bit 3 Bit 2 Bit 1 Bit 0

00

Power Auto Off function

(When no key operation & weigh operation)

0000: No Auto Power Off Function 0100: 1 hour
0001: 3 minute 0101: 3 hours
0010: 10 minutes 0110 ~ 1111: Not used
0011: 30 minutes

01

Buzzer

0: On
1: Off

Not Used Not Used Not Used

02

Multi-Currency (Convert National Currency
to “EURO”)

*V1.22

00: No Conversion 10: Method 2
01: Method 1 11: Not used

Not Used Not Used

03

Decimal Point Position on EURO conversion Rate

*V1.25

000: 7th digit (0.000000) 011: 4th digit (000.000)
001: 6th digit (0.00000) 100: 3rd digit (0000.00)
010: 5th digit (00.0000) 101 ~ 111: Not used

Not Used

2.6.2. Weight & Measure Specification List (1 4 2) V1.26

Note: It can only work when the SPAN Switch is on (Enable)

SPEC Bit 3 Bit 2 Bit 1 Bit 0

08

Price Base:

0000: $/kg 0010: $/lb
0001: $/100g 0011 ~ 1111: Not used

09

AMT/TEMD
Operation

0: Method B
1: Method A

G.T. Correct

0: Enable
1: Disable

Key-Sheet Layout

0: 6/8 Preset Keys
1: 14 Preset Keys

IR Mode Protected
By SPAN SW

0: No
1: Yes

10

Zero Lamp "On"

0: Gross 0
1: Net 0

Scale Start

0: Automatic
1: Manual

Auto Operation

0: No
1: Yes

Display Hold

0: NO
1: YES

11

Decimal Point Position On Weight Display

00: No decimal point
01: Not used
10: 3rd digit (000.00)

11: 4th digit (00.000)

Decimal Point Position On Unit And Total
Price Display

00: No decimal point
01: 2nd digit (0000.0)
10: 3rd digit (000.00)

11: Not used

12

Minus Weight Display Mask

00: Minus gross > 9e
01: Minus gross Weight
10: Minus Net Weight

11: Not used

Fixed Zero At The End Of Unit And Total
Price Display

00: NO fixed zero 10: 2 fixed zero
01: 1 fixed zero 11: Not used

Page No. 10

DS-685L/F Series Service Manual

SPEC Bit 3 Bit 2 Bit 1 Bit 0

13

Selection Of Capacity

0000: 3000: (3.000kg, 30.00kg, 30.00lb) 1 - - - - - - - , - - - - - - - ­0001: 6000: (6.000kg) 2 / 1(0~3000) , 2(3000~6000)
0011: 15000: (15.000kg) 5 / 2(0~6000) , 5(6000~15000)
0101: 30000: (30.000kg, 30.000lb) 10 / 5(0~15000), 10(15000~30000)

1000: 30000: (30.000kg) 10 - - - - - - - , - - - - - - - -

14

Selection Of Resolution

00: Single Interval 10: 1/7500 or 1/6000
01: Multi Interval 11: Not Used

Multi-Interval
Setting For

0: Net
1: Gross

Selection Of Model

*V1.21

0: DS-685
1: DS-688

15

Additional Rounding For Total Price

00: NO Additional Rounding
01: 1/4 Rounding (25 step)
10: Special Rounding (5 step)
11: Rounding For 1ST Digit

Rounding For Total
Price

0: Rounding
1: Truncation

Selection Of
Segment-Check

Style

*V1.21

0: Fast
1: Standard

16

Manual Tare Clear

0: Enable
1: Disable

Tare Subtraction

0: Allow
1: Inhibit

Tare Accumulation

0: Allow
1: Inhibit

Re-zero Function

*V1.26

0: Allow
1: Inhibit

17

Digital Tare

0: Enable
1: Disable

Accumulation When
Tare

0: Enable
1: Disable

Zero Tracking When
Tare

0: Inhibit
1: Allow

Weight Reset When
Tare

0: Allow
1: Inhibit

18

Tare Value
Exchange

0: Allow
1: Inhibit

AUTO Tare Clear
When Re-zero

0: No
1: Yes

Tare AUTO Clear

0: Inhibit
1: Allow

Unit Price AUTO
Clear

0: Inhibit
1: Allow

19

AUTO Clear
Condition

0: >= Gross 21e
& >= Net 5e
1: >=Net 1e & price

not 0

WT Data Synchro­nization (+ Key)

0: No
1: Yes

Accumulation
Number Display

0: No
1: Yes

Management Mode
(Grand Total)

0: Enable
1: Disable

20

Accumulation

0: Allow
1: Inhibit

Subtraction

0: Allow
1: Inhibit

Multiplication

0: Allow
1: Inhibit

Tender Or Change

0: Allow
1: Inhibit

21

Exit From
Accumulation

Mode After 15 Sec

0: No
1: Yes

Exit From
Accumulation Mode

When Weight Change

0: No
1: Yes

Accumulation When
Weight Not Removed

0: Allow
1: Inhibit

Accumulation When
Weight Change < +/-

10e

0: Disable
1: Enable

22

Tax

*V1.22

0: Inhibit
1: Allow

Key Layout

*V1.22

0: Standard
1: Japan

Not Used Not Used

23

Start Range

*V1.26

00: +-10% FS 10: +-3% FS
01: +-5% FS 11: +-2% FS

Not Used Not Used

Page No. 11

DS-685L/F Series Service Manual

2.7. DS-685F Specification List (version 1.06)

2.7.1. User Specification List (1 4 1) V1.06

SPEC Bit 3 Bit 2 Bit 1 Bit 0

0

Power Auto Off function

(for no key operation & weigh operation)

0000 – No Auto power off function 0100 - 1 hour
0001 - 3 minute 0101 - 3 hours
0010 - 10 minutes 0110 ~ 1111 - Not used
0011 - 30 minutes

1

Buzzer

0 - On
1 - Off

FIP Brightness Levels

(Varying Levels For Different Brightness)

000 - Highest Brightness Level
|
111 - Lowest Brightness Level

2

Multi-Currency (Convert to “EURO”)

*V1.02

00 - No Multi-Currency 10 - Method 2
01 - Method 1 11 - Not used

Not Used Not Used

3

Decimal Point Position on EURO conversion Rate

*V1.05

000 - 7th digit (0.000000) 011 - 4th digit (000.000)
001 - 6th digit (0.00000) 100 - 3rd digit (0000.00)
010 - 5th digit (00.0000) 101 ~ 111 - Not used

Not Used

2.7.2. For Weight & Measure - (1 4 2) V1.06
NOTE: It can only work when the SPAN Switch is on (Enable)

SPEC Bit 3 Bit 2 Bit 1 Bit 0

8

Price Base

0000 - $/kg 0010 - $/lb
0001 - $/100g 0011 ~ 1111 - Not used

9

AMT/TEMD Operation

0 - Method B
1 - Method A

G.T. Correction

0 - Allow
1 - Inhibit

Key Layout

0 - 6/8 Preset Keys
1 - 14 Preset Keys

IR Mode Protected
By SPAN SW

0 - NO
1 - YES

10

ZERO Lamp ON

0 - Gross 0
1 - Net 0

Scale Start

0 - Automatic
1 - Manual

Auto Operation

0 - NO
1 - YES

Display Hold

0 - NO
1 - YES

11

Decimal Point Position On Weight Display

00 - No decimal point
01 - 2nd digit (0000.0)
10 - 3rd digit (000.00)
11 - 4th digit (00.000)

Decimal Point Position On Unit And
Total Price Display

00 - No decimal point
01 - 2nd digit (0000.0)
10 - 3rd digit (000.00)
11 - 4th digit (00.000)

12

Negative Weight Display Mask

00 - Minus gross >9e 10 - Minus Net
01 - Minus gross 11 - Not used

Decimal Point Form

0 - Period (.)
1 - Comma (,)

Tax

*V1.02

0 - NO
1 - YES

13

Selection Of Capacity

0000 - 3000 - (3.000kg, 30.00kg, 30.00lb) 1 - - - - - - - , - - - - - - - ­0001 - 6000 - (6.000kg) 2 / 1(0~3000) , 2(3000~6000)
0011 - 15000 - (15.000kg) 5 / 2(0~6000) , 5(6000~15000)
0101 - 30000 - (30.000kg, 30.000lb) 10 / 5(0~15000), 10(15000~30000)
1000 - 30000 - (30.000kg) 10 - - - - - - - , - - - - - - - -

Page No. 12

DS-685L/F Series Service Manual

SPEC Bit 3 Bit 2 Bit 1 Bit 0

14

Selection Of Resolution

00 - Single Interval 10 - 1/7500 Or 1/6000
01 - Multi Interval 11 - Not Used

Multi-Interval Setting

0 - Net Multi-Interval
1 -Gross Multi-Interval

Selection Of Model

0 - DS-685
1 - DS-688

15

Additional Rounding For Total Price

000 - NO Additional Rounding 011 - Rounding For 1st Digit
001 - 1/4 Rounding (25 step) 100 - 5 Floor (0-4 -> 0, 5-9 -> 5)

010 - Special Rounding (5 step) 101 - Truncate 1st Digit

Rounding For Total
Price

0 - Rounding
1 - Truncation

16

Manual Tare Clear

0 - Allow
1 - Inhibit

Tare Subtraction

0 - Allow
1 - Inhibit

Tare Accumulation

0 - Allow
1 - Inhibit

Segment-Check
Style

0 - Fast
1 - Standard

17

Digital Tare

0 - Allow
1 - Inhibit

Accumulation When
Tare

0 - Allow
1 - Inhibit

Zero Tracking When
Tare

0 - Inhibit
1 - Allow

Weight Reset When
Tare

0 - Allow
1 - Inhibit

18

Tare Value Exchange

0 - Allow
1 - Inhibit

AUTO Tare Clear
When Re-zero

0 - Inhibit
1 - Alow

Tare AUTO Clear

0 - Disable
1 - Enable

Unit Price AUTO
Clear

0 - Disable
1 - Enable

19

Auto Clear Condition

0 - >= Gross 21e
& >= Net 5e
1 - >=Net 1e & price

not 0

WT Data Synchro.
(+ Key only)

0 - NO
1 - YES

Accumulation
Number Display

0 - NO
1 - YES

Management Mode
(Grand Total)

0 - Enable
1 - Disable

20

Accumulation

0 - Enable
1 - Disable

Subtraction

0 - Enable
1 - Disable

Multiplication

0 - Enable
1 - Disable

Tender Or Change

0 - Enable
1 - Disable

21

Exit From
Accumulation
Mode After 15 Sec

0 - Inhibit
1 - Allow

Exit From Accumula.
Mode When Weight
Changed

0 - Inhibit
1 - Allow

Price Accumulation
Without Removing
Weight

0 - Allow
1 - Inhibit

Price Accumulation
When Weight
Changed < +/- 10e

0 - Allow
1 - Inhibit

22

Charging Lamp On
When Charging

0 - NO
1 - YES

Keyboard & Display Type

*V1.01

000 - Standard Type 011 - UK type
001 - CA Type 100 - Japan type *V1.02

010 - U1 Type 100 ~ 111 - Not Used

23

kg/lb Conversion
(CA Type)

*V1.01

0 - Inhibit
1 - Allow

Unit Price 1/2,1/4 lb
Base (U1 Type)

*V1.01

0 - Inhibit
1 - Allow

Price Base (UK Type)

*V1.01

0 - Inhibit
1 - Allow

Price Base AUTO
Clear (UK Type)

*V1.01

0 - Inhibit
1 - Allow

24

Start Range

*V1.06

00 - +-10% FS 10 - +-3% FS
01 - +-5% FS 11 - +-2% FS

Re-Zero Function

*V1.06
0 - Enable

1 - Disable

Not Used

Page No. 13

DS-685L/F Series Service Manual

2.8. Location Of Sealing Screw

DS-685 provides two sealing positions for the purpose of sealing as shown in the diagram below.

Page No. 14

DS-685L/F Series Service Manual

Page No. 15

3. Error Message

The following error message will appear when a incorrect operation is performed.

Message Reasons Appropriate

O F

When displayed weight exceeded
capacity+9d, or something is on the
platter when power on.

Remove the item on the platter.

U F

When displayed minus weight < -9d

Re-Zero or On/Off again, if still no
good please check the Load Cell or
A/D board are problem or not.

E R R O R

When calibration operation is not
correct, or A/D starting check error.

Repeat calibration operation, if still
no good please check the load cell
or A/D board are problem or not.

# # # # #

(*Note)

Scale is not steady when power on

Place scale on firm, flat base. If still
no good please try to recalibrate it.

totAL FULL

When current Total overflow.

Clear current Total, or check the
memory chip.

G.t. FULL

When Grand Total overflow.

Clear Grand Total, or check the
memory chip.

Note: “ # # # # # ” - All segment display.

If you still cannot remove the trouble what you met according to above information, please
contact to our Technical Service Dept. as cover page indicated.

DS-685L/F Series Service Manual

Page No. 16

4. Hardware Detail

4.1. DS-685L

4.1.1. NRFI Electrical Connection Block Diagram

4.1.2. RFI Electrical Connection Block Diagram

DS-685L/F Series Service Manual

Page No. 17

4.1.3. Microcomputer Pin Assignment
The uPD75P308GF/uPD75308GF Microcomputer was chosen for the following reasons:

z

Low operating current

z

Having an on-chip programmable LCD controller/driver

z

Six interrupt sources and efficient interrupt processing

z

Three versatile timers

z

Less chip count

z

Pin compatibility of similar package with difference ROM sizes

z

Good support

Pin I/O Assignment Device Remark

P00/INT4
P01/SCK O SCK 93C46P EEPROM

P02/SO O S0 93C46P EEPROM

P03/SI I SI 93C46P EEPROM
P10/INT0 I SPANSW SWITCH Span Enable/Disable
P11/INT1 I A/D INT uPC4062 A/D Conversion Interrupt
P12/INT2 I BATTERY DETECT 1 uPC393C Detects battery Voltage Level 1

P13/TI0 I BATTERY DETECT 2 uPC393C Detects battery Voltage Level 2

P20/PTO0 O A/D CONTROL 74HC4066 A/D Conversion Control

P21 O A/D CONTROL 74HC4066 A/D Conversion Control
P22/PCL O A/D CONTROL 74HC4066 A/D Conversion Control
P23/BUZ O A/D CONTROL 74HC4066 A/D Conversion Control

P30 O CS 93C46P EEPROM

P31 O MAIN POWER ON/OFF Power Switch DC MAIN POWER

P32 O BUZZ Buzzer Buzzer Sounder

P33

P40 O T8 Keyboard Key Scanning Line

P41 O T1 Keyboard Key Scanning Line

P42 O T2 Keyboard Key Scanning Line

P43 O T3 Keyboard Key Scanning Line

P50 O T4 Keyboard Key Scanning Line

P51 O T5 Keyboard Key Scanning Line

P52 O T6 Keyboard Key Scanning Line

P53 O T7 Keyboard Key Scanning Line
P60/KR0 I K1 Keyboard Key Return Line
P61/KR1 I K2 Keyboard Key Return Line
P62/KR2 I K3 Keyboard Key Return Line
P63/KR3 I K4 Keyboard Key Return Line
P70/KR4 I K5 Keyboard Key Return Line
P71/KR5
P72/KR6
P73/KR7

S0 O SEGMENT 0 T195013 Segment Signal Output
S1 O SEGMENT 1 T195013 Segment Signal Output
S2 O SEGMENT 2 T195013 Segment Signal Output

DS-685L/F Series Service Manual

Page No. 18

Pin I/O Assignment Device Remark

S3 O SEGMENT 3 T195013 Segment Signal Output
S4 O SEGMENT 4 T195013 Segment Signal Output
S5 O SEGMENT 5 T195013 Segment Signal Output
S6 O SEGMENT 6 T195013 Segment Signal Output
S7 O SEGMENT 7 T195013 Segment Signal Output
S8 O SEGMENT 8 T195013 Segment Signal Output

S9 O SEGMENT 9 T195013 Segment Signal Output
S10 O SEGMENT 10 T195013 Segment Signal Output
S11 O SEGMENT 11 T195013 Segment Signal Output
S12 O SEGMENT 12 T195013 Segment Signal Output
S13 O SEGMENT 13 T195013 Segment Signal Output
S14 O SEGMENT 14 T195013 Segment Signal Output
S15 O SEGMENT 15 T195013 Segment Signal Output
S16 O SEGMENT 16 T195013 Segment Signal Output
S17 O SEGMENT 17 T195013 Segment Signal Output
S18 O SEGMENT 18 T195013 Segment Signal Output
S19 O SEGMENT 19 T195013 Segment Signal Output
S20 O SEGMENT 20 T195013 Segment Signal Output
S21 O SEGMENT 21 T195013 Segment Signal Output
S22 O SEGMENT 22 T195013 Segment Signal Output
S23 O SEGMENT 23 T195013 Segment Signal Output

BP0/S24 O SEGMENT 24 T195013 Segment Signal Output
BP1/S25 O SEGMENT 25 T195013 Segment Signal Output
BP2/S26 O SEGMENT 26 T195013 Segment Signal Output
BP3/S27 O SEGMENT 27 T195013 Segment Signal Output
BP4/S28 O SEGMENT 28 T195013 Segment Signal Output
BP5/S29 O SEGMENT 29 T195013 Segment Signal Output
BP6/S30 O SEGMENT 30 T195013 Segment Signal Output
BP7/S31 O SEGMENT 31 T195013 Segment Signal Output

COM0 O COMMON 0 T195013 Common Signal Output
COM1 O COMMON 1 T195013 Common Signal Output
COM2 O COMMON 2 T195013 Common Signal Output
COM3 O COMMON 3 T195013 Common Signal Output

BIAS O BIAS - LCD Drive Power Supply
VLC0 - VLC0 - LCD Drive Power Pin
VLC1 - VLC1 - LCD Drive Power Pin
VLC2 - VLC2 - LCD Drive Power Pin

RESET I RESET - SYSTEM RESET

X1 I - Oscillator 4.19 MHz Crystal

X2 I - Oscillator 4.19 MHz Crystal

XT1 I - - Connect To The VSS Pin

XT2
VSS - - - Grounding Potential Pin
VDD - - - Positive Power Pin (5V)

NC/VPP - - - Connect To T he VDD Pin

DS-685L/F Series Service Manual

Page No. 19

4.2. DS-685F

4.2.1. NRFI Electrical Connection Block Diagram

4.2.2. RFI Electrical Connection Block Diagram

DS-685L/F Series Service Manual

Page No. 20

4.2.3. Microcomputer Pin Assignment
The uPD75P216A/uPD75212A Microcomputer was chosen for the following reasons:

z

Low operating current.

z

Having an on-chip programmable FIP controller/driver.

z

Eight interrupt sources and efficient interrupt processing.

z

Four versatile timers.

z

Less chip count.

z

Pin compatibility of similar package with difference ROM sizes.

z

Good support.

Pin I/O Assignment Device Remark

P00/INT4 I ON/OFF ON/OFF KEY Detects ON/OFF Key Status
P01/SCK O SCK 93C46P EEPROM

P02/SO O S0 93C46P EEPROM

P03/SI I SI 93C46P EEPROM
P10/INT0 I A/D INT uPC4062 A/D Conversion Interrupt
P11/INT1 I VPAC L7815 Detects AC Power ON
P12/INT2 I * VBATL2 LM324 Detects BATT Low 2

P13/TI0 I TI0 74HC4520 External Event Pulse Input

P20 O CS 93C46P EEPROM
P21 O FIP-PW FIP-PW Controls FIP Power
P22 O RES 74HC4520 Controls 74HC4520 Reset

P23/BUZ O BUZZ Buzzer Buzzer Sounder

P30 I * VBATL1 LM324 Detects BATT Low 1
P31 I EN 74HC4520 Controls 74HC4520 EN
P32 O * BAT-CHG BAT-CHG Controls BATT Charge
P33 O * BAT-PW BAT-PW Controls BATT Power
P40 O A/D PA 74HC4066 Controls A/D Conversion
P41 O A/D PZ 74HC4066 Controls A/D Conversion
P42 O A/D P- 74HC4066 Controls A/D Conversion
P43 O A/D P+ 74HC4066 Controls A/D Conversion
P50 I Q0 74HC4520 Input data
P51 I Q1 74HC4520 Input data
P52 I * VBATLH2 LM324 Detects BATT High Level2
P53 I * VBATLH1 LM324 Detects BATT High Level1
P60 I K1 Keyboard Key Return Line
P61 I K2 Keyboard Key Return Line
P62 I K3 Keyboard Key Return Line
P63 I K4 Keyboard Key Return Line

S0 O P17 19-LT-03GK Segment Signal Output
S1 O P16 19-LT-03GK Segment Signal Output
S2 O P15 19-LT-03GK Segment Signal Output
S3 O P14 19-LT-03GK Segment Signal Output
S4 O P13 19-LT-03GK Segment Signal Output
S5 O P12 19-LT-03GK Segment Signal Output
S6 O P11 19-LT-03GK Segment Signal Output
S7 O P10 19-LT-03GK Segment Signal Output
S8 O P9 19-LT-03GK Segment Signal Output
S9 O P8 19-LT-03GK Segment Signal Output

DS-685L/F Series Service Manual

Page No. 21

Pin I/O Assignment Device Remark

T15/S10 O T1 19-LT-03GK Digtal SignalOutput
T14/S11 O T2 19-LT-03GK Digtal SignalOutput
T13/S12 O T3 19-LT-03GK Digtal SignalOutput
T12/S13 O T4 19-LT-03GK Digtal SignalOutput
T11/S14 O T5 19-LT-03GK Digtal SignalOutput
T10/S15 O T6 19-LT-03GK Digtal SignalOutput

T9 O U1 19-LT-03GK Digtal SignalOutput
T8 O U2 19-LT-03GK Digtal SignalOutput
T7 O U3 19-LT-03GK Digtal SignalOutput
T6 O U4 19-LT-03GK Digtal SignalOutput
T5 O U5 19-LT-03GK Digtal SignalOutput
T4 O W1 19-LT-03GK Digtal SignalOutput
T3 O W2 19-LT-03GK Digtal SignalOutput
T2 O W3 19-LT-03GK Digtal SignalOutput
T1 O W4 19-LT-03GK Digtal SignalOutput
T0 O W5 19-LT-03GK Digtal SignalOutput

VPRE - VPRE - Power Supply

VLOAD - VLOAD - Pull-down Resistor Pin

PPO O SC 93C46P Output Pulse

RESET I RESET - SYSTEM RESET

X1 I - Oscillator 4.19 MHz Crystal

X2 I - Oscillator 4.19 MHz Crystal
XT1 I - - Connect to VDD Pin
XT2

VSS - - - Gounding Potential Pin

VDD - - - Positive Power Pin (5V)

Note: '*' - For Rechargeable Battery type only.

DS-685L/F Series Service Manual

Page No. 22

5. Circuitry Diagram

We can not issue the electrical file for Circuitry Diagram, so please contact to us for paper copy if
you need it.

Thanks for your cooperation!