Tait T610 User manual

M610-100 i
Copyright TEL 15/6/95
inform
T610 Mobile Data Terminal
Service Manual
Issue 1.00
June 1995
M610-100-100

ii M610-100
15/6/95 Copyright TEL
Head Office
New Zealand
Tait Electronics Ltd
558 Wairakei Road
P.O. Box 1645
Christchurch
New Zealand
Phone: [phone]
Fax: [phone]
Australia
Tait Electronics (Aust) Pty Ltd
275 Toombul Road
Northgate 4013
P.O. Box 679
Virginia
Queensland 4014
Australia
Phone: [phone]
Toll Free: 1800 077-112
Fax: [phone]
Canada
Tait Mobile Radio Inc.
Unit 5, 158 Anderson Avenue
Markham
Ontario L6E1A9
Canada
Phone: [phone]
Toll Free: 1 800 890-8248
Fax: [phone]
France
Tait France Sarl
2 Avenue de la Cristallerie
92 316 Sèvres, Cedex
France
Phone: [phone]
Fax: [phone]
Germany
Tait Mobilfunk GmbH
Willstätterstraße 50
D-90449 Nürnberg 60
Germany
Phone: [phone]
Fax: [phone]
New Zealand
Tait Communications Ltd
Unit 4, 75 Blenheim Road
P.O. Box 1185
Christchurch
Phone: [phone]
Fax: [phone]
Singapore
Tait Electronics (Far East) Pte Ltd
4 Leng Kee Road
SIS Building #05-11A
Singapore 0315
Phone: [phone]
Fax: [phone]
United Kingdom
Tait Mobile Radio Ltd
Ermine Business Park
Ermine Road
Huntingdon
Cambridgeshire PE18 6YA
United Kingdom
Phone: [phone]
Fax: [phone]
USA
Tait Electronics (USA) Inc.
9434 Old Katy Road
Suite 110
Houston
Texas 77055
USA
Phone: [phone]
Toll Free: 1 800 222-1255
Fax: [phone]

M610-100 iii
Copyright TEL 15/6/95
Contents
Preliminary Pages
Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Updating Equipment And Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Ordering Tait Service Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Date Of Issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Amendment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
List of Effective Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1 Introduction
1.1 Introduction to this Service Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Introduction to the T610 MDT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.1 Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.3.3 Miscellaneous Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 Health and Safety Information
2.1 Hazards During Use of the MDT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Hazards During Service of the MDT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 Caution: CMOS Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2 Lithium Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.2.1 Battery Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.2.2 Contact with Antistatic Conductive Materials . . . . . . . . . . . . . . . . . . . . 2-5

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Copyright TEL 15/6/95
3 Circuit Operation
3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1 Protection Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.1.3 LCD Backlighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.1.4 Piezo and Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.1.5 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.1.6 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.1.7 LCD Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.1.8 Microprocessor and Memory Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
4 Servicing
4.1 Introduction to Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.1 Pozidriv Recess Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.2 Screw Torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.3 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.1.4 Tools required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.5 Caution: CMOS Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.2.1 Removing the MDT from its Working Installation . . . . . . . . . . . . . . . . . . . 4-5
4.2.1.1 Disconnecting the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.2.1.2 Removing the MDT from the Mounting Bracket . . . . . . . . . . . . . . . . . . 4-5
4.2.2 Removing the Sunshield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.2.3 Disassembling the MDT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.2.3.1 Separating the Front Panel and Rear Panel Assemblies . . . . . . . . . . . . . 4-7
4.2.3.2 Separating the Main PCB from the Rear Panel . . . . . . . . . . . . . . . . . . . . 4-8
4.2.3.3 Removing the PCB Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
4.2.3.4 Separating the LCD from the Front Panel . . . . . . . . . . . . . . . . . . . . . . . 4-10
4.3 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4.3.1 Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4.3.1.1 Leaded Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
4.3.2 Surface Mount Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4.3.3 Fitting a New Battery to the Main PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4.4 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
4.4.1 Fitting the LCD to the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
4.4.2 Fitting the Main PCB and Shield to the Rear Panel . . . . . . . . . . . . . . . . . . 4-15
4.4.2.1 Fitting the Shield to the Main PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
4.4.2.2 Completing the Rear Panel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
4.4.3 Completing the Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17

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Copyright TEL 15/6/95
5 Functional Tests
5.1 Preparation for Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.1.1 Serial Port Loop Back Test Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.1.2 Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.2 Testing the MDT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.2.1 Starting Up the MDT in Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.2.2 Power Up Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5.2.2.1 Self-Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5.2.3 Supervising Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
6 Fault Finding
6.1 MDT Won’t Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.2 Start-up Self Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.2.1 LCD Module Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.2.2 RAM Operation Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.2.2.1 Address Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.2.3 RAM Integrity Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6.3 Test Mode Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6.3.1 Port 1 and/or Port 2 Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6.3.1.1 Port 1 and Port 2 Tests Fail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6.3.1.2 Port 1 Test Fails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
6.3.1.3 Port 2 Test Fails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
6.3.2 Serial # Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
6.3.3 Flash ROM Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
6.3.4 Piezo Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
6.3.5 Backlight Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
6.3.6 Contrast Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
6.3.7 Key Test Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
7 PCB Information
7.1 Using the PCB Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1.1 Circuit Diagram and PCB layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.1.2 Grid Reference Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.1.3 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7.2 Main PCB (IPN 220-01310-01). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Mechanical and Miscellaneous Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6
Grid Reference Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

vi M610-100
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List Of Illustrations
Figure 2.1 Typical Antistatic Bench Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Figure 3.1 T610-100 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Figure 4.1 Typical Antistatic Bench Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Figure 4.2 Removing the MDT from its Working Installation . . . . . . . . . . . . . . . . . 4-5
Figure 4.3 Disassembling the MDT - Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4.4 Separating the Main PCB from the Rear Panel - Internal View . . . . . . 4-8
Figure 4.5 Disconnecting the LCD to Main PCB Ribbon Cable . . . . . . . . . . . . . . . . 4-9
Figure 4.6 Separating the LCD from the Front Panel - Internal View of Front
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Figure 4.7 Fitting the LCD to the Front Panel - Internal View of Front
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Figure 4.8 Fitting the Main PCB and Shield to the Rear Panel - Internal View . . 4-15
Figure 4.9 Connecting the LCD to Main PCB Ribbon Cable . . . . . . . . . . . . . . . . . 4-16
Figure 4.10 Assembling the MDT - Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Figure 5.1 Wiring Arrangement for Serial Port Loop Back Test Connector . . . . . 5-2
Figure 5.2 MDT Test Mode Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Figure 5.3 MDT System Start-up Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Figure 5.4 MDT Test Mode Display - Tests Complete . . . . . . . . . . . . . . . . . . . . . . . 5-7
Figure 6.1 SN1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
T610 Main PCB - Top Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
T610 Main PCB - Bottom Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
List Of Tables
Table 4.1 Screw Torques ................................................................................................4-2
Table 4.2 MDT Disassembly - Primary Units and Sub-units ...................................4-6
Table 5.1 Self-Test Fail Notification .............................................................................5-5
Table 5.2 Test Routines and Outcomes .......................................................................5-6
Table 6.1 Serial Communications ................................................................................6-5

M610-100 vii
Copyright TEL 15/6/95
Scope of Manual
This Manual contains technical and servicing information in support of the inform T610
Mobile Data Terminal (MDT).
Technical Information
Any enquiries regarding this manual or the equipment it describes should be addressed
in the first instance to your nearest approved Tait representative. Further technical
assistance may be obtained from Tait Mobile Data, Tait Electronics Ltd, Christchurch,
New Zealand.
Updating Equipment And Manuals
In the interests of improving performance, reliability or servicing, Tait Electronics Ltd.
reserve the right to update their equipment and/or manuals without prior notice.
Copyright
All information contained in this manual is the property of Tait Electronics Ltd. All
rights are reserved. This manual may not, in whole or part, be copied, photocopied,
reproduced, translated stored or reduced to any electronic medium or machine readable
form without prior written permission from Tait Electronics Ltd.
Trademarks
inform is a trademark of Tait Electronics Limited.
Ordering Tait Service Manuals
Service Manuals should be ordered from your nearest approved Tait representative.
When ordering, quote the Tait Internal Part Number (IPN) and, where applicable, the
version.
Date Of Issue
IPN: M610-100 inform T610 MDT Service Manual
Issue 1.00 published 15th June 1995

viii M610-100
15/6/95 Copyright TEL
Amendment Procedure
This manual is subject to an amendment procedure which allows it to be updated to
include details of any modifications that may be made to the inform MDT. The salient
details of the amendment procedure are as follows:
• The manual is provided as loose-leafed pages assembled in a ring binder to allow
obsolete pages to be removed and exchanged for current information.
• All amendments are issued in the form of revision packages. Revision packages
comprise copies of all updated pages and specific instructions for the incorpora-
tion of each amended page into the manual.
• Each time a revision package is released, all registered copyholders of the manual
are notified. Copies of the revision package can be ordered from Tait Electronics as
required. Revision packages are provided ready-punched for inclusion in your
manual.
• Each page in this manual is printed with an issue status to allow you to identify
which pages have been updated. Whenever an amended page is issued by Tait
Electronics, the issue status of the page shall be updated also.
• A list of effective pages is included among the preliminary pages of this manual.
The list shows the issue status of each page. Whenever an amended page is
issued, an updated list of effective pages shall be issued also.
• It is the responsibility of the copyholder to ensure that all amendments are incor-
porated into the manual.

M610-100 ix
Copyright TEL 15/6/95
List Of Effective Pages
This manual comprises a total of 76 pages, as listed below.
Note: Any portion of text that has been changed is indicated by a vertical line in
the outer margin of the page.
Page Issue Date
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