Digi DS-425 Service Manual
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Digi DS-425 Service Manual

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SERVICE MANUAL
Edition
Shanghai Teraoka Electronic Co., Ltd.
Ting Lin Industrial Development Zone Jin Shan District, Shanghai P. R. China 201505
Tel: +86-21-5723-4888
Model: DS-425
Month
st
1
September
nd
2
December
rd
3
April
th
4
January
Fax: +86-21-5723-9330
Year
1998
1998
2001
2002
--- Technical Service Dept.
E- mail:
steservice@digi-scale.com
V1.0

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Summary of Contents for Digi DS-425

  • Page 1 V1.0 SERVICE MANUAL Model: DS-425 Edition Month Year September 1998 December 1998 April 2001 January 2002 Shanghai Teraoka Electronic Co., Ltd. --- Technical Service Dept. Ting Lin Industrial Development Zone Jin Shan District, Shanghai P. R. China 201505 Tel: +86-21-5723-4888...

  • Page 2: Table Of Contents

    DS-425 Service Manual --- V1.04 CONTENTS 1. General Specification 1.1. Overall Dimension ---------------------------------------------------------------------------- 1 1.2. Display Panel ------------------------------------------------------------------------------------- 1.3. Main Feature -------------------------------------------------------------------------------------- 2 1.4. Operation Condition ---------------------------------------------------------------------------- 2 1.5. Main Function -------------------------------------------------------------------------------------- 2 1.6. Layout And Function ---------------------------------------------------------------------------- 3 2. Initial Set-Up 2.1.

  • Page 3: General Specification

    DS-425 Service Manual 1. General Specification 1.1. Overall Dimension 1.2. Display Panel 01 General Specification Page No. 1...

  • Page 4: Main Feature

    DS-425 Service Manual 1.3. Main Feature • Model : DS-425 • Display Resolution : 1/1000, 1/1500, 1/2000, 1/2500, 1/3000, 1/5000, 1/6000, 1/7500, 1/10000, 1/15000, 1/20000, 1/25000, 1/30000 • Internal Resolution : 1/250000, 1/300000 • Capacity : 300g, 600g, 1.5kg, 3kg, 6kg, 15kg, 30kg •...

  • Page 5: Layout And Function

    DS-425 Service Manual 1.6. Layout and Function 1.6.1. Key Sheet and Function a) Key Layout b) Key Function Function [On/Off] For turning the scale ON and OFF [Re- Resetting the scale to zero. Zero] [Tare] For setting & clearing tare value.

  • Page 6: Main Operation

    DS-425 Service Manual 3. Main Operation 3.1. System On Indication Flag: B - Bright S - Sparkling 1-ZERO 2-NET 3-STD 4-U.C 5-SAF 6-SAC 7-S1 8-S2 9-S3 10-S4 Indicator Operation Weight Remarks 1 2 3 4 5 6 7 8 9 10...

  • Page 7: Gross / Net Display Toggle

    DS-425 Service Manual 3.4. Gross / Net Display Toggle Indication Flag: B - Bright S - Sparkling 1-ZERO 2-NET 3-STD 4-U.C 5-SAF 6-SAC 7-S1 8-S2 9-S3 10-S4 Indicator Operation Weight Remarks 1 2 3 4 5 6 7 8 9 10 Weight Stable 0.0000...

  • Page 8: Set-Point Setting

    DS-425 Service Manual 3.7. Set-Point Setting (SPEC8 BIT0 = 1) Indication Flag: B - Bright S - Sparkling 1-ZERO 2-NET 3-STD 4-U.C 5-SAF 6-SAC 7-S1 8-S2 9-S3 10-S4 Indicator Operation Weight Remarks 1 2 3 4 5 6 7 8 9 10 Weight Stable 0.0000...

  • Page 9: Set-Point Alarm Function

    DS-425 Service Manual 3.8. Set-Point Alarm Function This function has two methods: Filling and Weight Check Method. 3.8.1. Filling Method Operator fills the item on the platter up to the target weight range. The target range is determined by 2-set-point (set-point 2 and set-point 3) and continuously fast alarm will be alert.
  • Page 10 DS-425 Service Manual For Example: Set-point 1 = 0.0100kg, Point 2 = 0.0200kg, Point 3 = 0.0350kg, Point 4 = 0.0550kg Indication Flag: B - Bright S - Sparkling 1-ZERO 2-NET 3-STD 4-U.C 5-SAF 6-SAC 7-S1 8-S2 9-S3 10-S4 Indicator...

  • Page 11: Rs-232C Protocol

    DS-425 Service Manual --- V1.04 4. RS-232C Protocol 4.1. Communication Specs Baud Rate: 2400, 4800, 9600, 19200. Start Bit: 1 Stop Bit: 1 Data Length: 8 Parity Bit: None 4.2. Communication Text Command Termination Code The end of data The end of Text...

  • Page 12: Communication Method

    DS-425 Service Manual --- V1.04 e.g.) With Header code and weight stability code Net weight =-1,2340 Tare weight = 0,450 and weight is stable Null Note 1): The data format consists of (header code), minus/plus sign, numeric data and decimal point. If weight data is minus, -(2DH) is added after header data. If weight is positive data, 0(30H) is output.
  • Page 13 If weight cannot be stable within the certain interval (set by specification), DS-425 will transmit NAK (15H) to PC. Note: If ACK signal is sent to DS-425 during digital tare or re-zero operation, NAK signal will be sent to PC.

  • Page 14: Hardware Specification

    DS-425 Service Manual --- V1.04 5. Hardware Specification 5.1. Main Components • Microcomputer: ATMAL AT89C52 8 bit • LCD Display Driver: NEC uPA7225G • A/D Board: STB-0054, (FOR DS-422), New A/D Cover. 5.2. Block Diagram A/D BLOCK STB-0054-3 MAIN BOARD BLOCK...

  • Page 15: Circuitry Diagram

    DS-425 Service Manual --- V1.04 5.4. Circuitry Diagram Please See Attached Pages for DS-425 Circuitry Diagram Technical Service Dept. Shanghai Teraoka Electronic Co., Ltd. 05 Hardware Specification Page No. 20...

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