Tait T880 II Series Guide

M880-00 1
Copyright TEL 10/07/00
T880 Series II
Base Station Equipment
800-960MHz
Initial Adjustment Manual
August 2000
M880-00-2A0

2M880-00
10/07/00 Copyright TEL
Head Office
New Zealand
Tait Electronics Ltd
558 Wairakei Road
P.O. Box 1645
Christchurch
New Zealand
Phone: [phone]
Fax: [phone]
Radio Systems Division
535 Wairakei Road
P.O. Box 1645
Christchurch
New Zealand
Phone: [phone]
Fax: [phone]
Australia
Tait Electronics (Aust) Pty Ltd
186 Granite Street
Geebung
Queensland 4034
P. O . B o x 6 7 9
Virginia
Queensland 4014
Australia
Phone: [phone]
Toll Free: 1 800 077 112
Fax: [phone]
Beijing
Tait Mobile Radio (HK) Ltd
Beijing Representative Office
Room 610, Tower 2
Beijing Henderson Centre
No. 18 Jianguomennei Da Jie
Doncheng District
Beijing
China 100005
Canada
Tait Mobile Radio Inc.
Unit 5, 158 Anderson Avenue
Markham
Ontario L6E 1A9
Canada
Phone: [phone]
Toll Free: 1 800 890 8248
Fax: [phone]
France
Ta i t F r an c e S a rl
2 Avenue de la Cristallerie
92 316 Sèvres, Cedex
France
Phone: [phone]
Fax: [phone]
Germany
Tait Europe Limited
Geschäftsstelle Deutschland
Fürther Str. 27
D-90429 Nürnberg
Germany
Phone: [phone]
Fax: [phone]
Hong Kong
Tait Mobile Radio (HK) Ltd
Unit 2216, North Tower
Concordia Plaza
No. 1 Science Museum Road
Tsim Sha Tsui East
Kowloon
Phone: [phone]
Fax: [phone]
New Zealand
Tait Communications Ltd
Unit 4, 75 Blenheim Road
P. O . B o x 11 8 5
Christchurch
Phone: [phone]
Fax: [phone]
Singapore
Tait Electronics (Far East) Pte Ltd
4 Leng Kee Road
SIS Building #05-11A
Singapore 159088
Phone: [phone]
Fax: [phone]
Ta i w a n
Tait Mobile Radio (Taiwan) Ltd
5Fl., No. 159, Keelung Rd
Sec. 1
Taipe i 110
Taiwa n
Phone: [phone]
Fax: [phone]
Thailand
Tait Mobile Radio Ltd
14/1 Suwan Tower
Third Floor
North Sathorn Road
Soi Saladaeng 1
Bangrak
Bangkok 10500
Thailand
Phone: [phone]
Fax: [phone]
United Kingdom
Tait Europe 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]
Internet
http://www.taitworld.com
T800
T800

M880-00 3
Copyright TEL 10/07/00
About This Manual
Scope This manual contains general, technical, tuning and adjustment
information on T880 Series II 5W base stations which comprise
the following equipment:
PCB Information PCB information is provided for all current issue PCBs, as well
as all previous issue PCBs manufactured in production quanti-
ties, and is grouped according to PCB. Thus, you will find the
parts list, grid reference index (if necessary), PCB layouts and
circuit diagram(s) for each individual PCB grouped together.
Errors If you find an error in this manual, or have a suggestion on how
it might be improved, please do not hesitate to contact Customer
Support, Tait Electronics Ltd, Christchurch, New Zealand (full
contact details are on page 2).
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.
Ordering Tait Service Manuals
You can order additional copies of this manual from your nearest Tait Dealer or Cus-
tomer Service Organisation. When ordering, make sure you quote the correct Tait prod-
uct code ("M" number). Note that only the latest issue of the manual will be available
for order.
5W base station T885 receiver
T881 5W transmitter

4M880-00
10/07/00 Copyright TEL
Table Of Contents
This manual is divided into five parts as listed below, with each part being further sub-
divided into sections. There is a detailed table of contents at the start of each part and/
or section.
Part Title
A Introduction To Servicing
B T885 Receiver
C T881 Transmitter

M880-00 AI
Copyright TEL 10/07/00
Part A Introduction To Servicing
This part of the manual is divided into the sections listed below. These sections provide
some general and advisory information on servicing procedures, and a brief history of
PGM800Win programming software.
Section Title Page
1
1.1
1.2
1.3
1.4
General
Additional Technical Information
Caution: CMOS Devices
Caution: Aerial Load
Caution: Beryllium Oxide & Power Transistors
1.1
1.1
1.1
1.2
1.2
2
2.1
2.2
2.3
2.3.1
2.3.2
2.4
2.5
Mechanical
Torx Recess Head Screws
Pozidriv & Philips Recess Head Screws
Disassembly/Reassembly
Receivers/Transmitters
Power Amplifiers
Cover Screw Torques
Chassis & Cover Compatibility
2.1
2.1
2.2
2.3
2.3
2.3
2.4
2.5
3
3.1
3.1.1
3.1.2
3.2
3.3
Component Replacement
Leaded Components
Desoldering Iron Method
Component Cutting Method
Surface Mount Devices
Cased Mica Capacitors
3.1
3.1
3.1
3.1
3.2
3.2
4
4.1
4.2
Software History
PGM800Win V1.0
PGM800Win V2.00
4.1
4.1
4.1
Figure Title Page
1.1
1.2
2.1
2.2
2.3
2.4
Typical Product Code & Serial Number Labels
Typical Anti-static Bench Set-up
Torx Screw Identification
Pozidriv & Philips Screw & Screwdriver Identification
Receiver/Transmitter Cover Screw Tightening Order
Identification Of New-Design Chassis & Covers
1.1
1.2
2.1
2.2
2.4
2.5

AII M880-00
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M880-00 General A1.1
Copyright TEL 10/07/00
1 General
1.1 Additional Technical Information
If you have any questions about this manual or the equipment it describes, please con-
tact your nearest Tait Dealer or Customer Service Organisation. If necessary, you can
get additional technical help from Customer Support, Radio Systems Division, Tait Elec-
tronics Ltd, Christchurch, New Zealand (full contact details are on page 2).
When requesting information, please quote either the manual product code (e.g.
M880-00-2A0), or the equipment product code and serial number which are printed on a
label on the back of the product (as shown in Figure 1.1).
Figure 1.1 Typical Product Code & Serial Number Labels
If you require information about a particular PCB, please quote the full PCB internal
part number (IPN) which is screen printed onto the top side of the board (refer to the
appropriate PCB Information section in this manual for more details).
1.2 Caution: CMOS Devices
This equipment contains CMOS Devices which are susceptible to damage from static
charges. Care when handling these devices is essential. For correct handling proce-
dures refer to the manufacturers' data books, e.g. Philips data books covering CMOS
devices, or Motorola CMOS data books, Section 5 'Handling', etc.
An anti-static bench kit (refer to Figure 1.2) is available from Tait Electronics Ltd under
the following product codes:
• KS0001 - 1 conductive rubber bench mat
- 1 earth lead to connect the mat to ground
• KS0004 - 1 wrist strap.
this area used for regional
Type Approval information
product code
serial number
T835-10-0000 Rev 1
900000
Tait Electronics Limited
Made in New Zealand
T838-10-0000
Rev 1
900000
Tait Electronics Limited
Made in New Zealand

A1.2 General M880-00
10/07/00 Copyright TEL
Figure 1.2 Typical Anti-static Bench Set-up
1.3 Caution: Aerial Load
The equipment has been designed to operate safely under a wide range of aerial loading
conditions. However, we strongly recommend that the transmitter should always be
operated with a suitable load to prevent damage to the transmitter output power stage.
1.4 Caution: Beryllium Oxide & Power Transistors
The RF power transistors in current use all contain some beryllium oxide. This sub-
stance, while perfectly harmless in its normal solid form, can become a severe health
hazard when it has been reduced to dust. For this reason the RF power transistors
should not be broken open, mutilated, filed, machined, or physically damaged in any
way that can produce dust particles.
to building earth
(not mains earth)
conductive
wrist strap conductive rubber
bench mat

M880-00 Mechanical A2.1
Copyright TEL 10/07/00
2 Mechanical
2.1 Torx Recess Head Screws
Torx recess head screws are becoming the standard screw head type in all T800 Series II
equipment, with Pozidriv and Philips recess head screws being used in fewer applica-
tions.
The Torx recess head has the advantage of improved screwdriver tip location, reducing
the chances of screw head damage caused by the driver tip rotating within the recess. In
addition, using a ball-tip Torx screwdriver allows you to drive a Torx head screw with
the driver on a slight angle, which can be useful in situations where access is restricted.
It is important that you use the correct Torx screwdriver tip:
M3 screws - T10
M4 screws - T20.
Figure 2.1 below shows a typical Torx recess head screw (actual hardware may differ
slightly from this illustration due to variations in manufacturing techniques).
Figure 2.1 Torx Screw Identification
"star" shaped recess with
six internal notches

A2.2 Mechanical M880-00
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2.2 Pozidriv & Philips Recess Head Screws
Pozidriv and Philips recess head screws will continue to be used in T800 Series II equip-
ment in a few special applications. It is important that you use the correct type and size
screwdriver for each screw type to avoid damaging the screw head.
It is particularly important that you do not use Philips screwdrivers on Pozidriv screw
heads as the tapered driving flutes of the Philips screwdriver do not engage correctly
with the parallel-sided slots in the Pozidriv screw head. This can result in considerable
damage to the screw head if the screwdriver tip turns inside the recess.
Note: If you find you need excessive downwards pressure to keep the screwdriver
tip in the Pozidriv screw head, you are probably using the wrong type and/
or size screwdriver.
Figure 2.2 below shows the main differences between typical Pozidriv and Philips screw
heads and screwdriver tips (actual hardware may differ slightly from these illustrations
due to variations in manufacturing techniques).
Figure 2.2 Pozidriv & Philips Screw & Screwdriver Identification
driving flutes with
parallel sides
driving flutes with
tapered sides
Pozidriv Philips
internal notches
"star" markings
between slots
no special markings
slots with parallel sides
slots with tapered sides
ridges between
driving flutes

M880-00 Mechanical A2.3
Copyright TEL 10/07/00
2.3 Disassembly/Reassembly
2.3.1 Receivers/Transmitters
To carry out alignment or change option links, you need to remove only the top cover,
i.e. the one adjacent to the front panel handle and on the opposite side to the main
D-range connector (D-range 1/PL100).
You need to remove the bottom cover to:
• access the transmitter RF power module;
• change solder blob links;
• fit test leads to circuit block access points.
2.3.2 Power Amplifiers
You should carry out the tuning and power output level setting procedures with the
cover on.
Note: All black finish Pozidriv screws used in the T889 are 4-40 UNC thread and
cannot be interchanged with M3 screws. Note that different lengths are
used in different applications.

A2.4 Mechanical M880-00
10/07/00 Copyright TEL
2.4 Cover Screw Torques
Receivers/Transmitters .. 2.0Nm/18in.lbf.
Power Amplifiers .. 0.9Nm/8in.lbf.
Note: To ensure that the receiver and transmitter will continue to meet their per-
formance specifications, you must tighten the screws securing the bottom
cover (the one furthest from the handle) to the correct torque, and in the cor-
rect order, as shown below.
Figure 2.3 Receiver/Transmitter Bottom Cover Screw Tightening Order
12
3
45
6
7
8
9
1011
12
13
14
Front

M880-00 Mechanical A2.5
Copyright TEL 10/07/00
2.5 Chassis & Cover Compatibility
The chassis and covers used in T800 Series II modules incorporate a number of design
changes to improve Electro-Magnetic Compatibility (EMC) performance. It is impor-
tant that only the new-design covers are fitted to the new chassis to ensure correct
mechanical fit and continued compliance with appropriate EMC Type Approval regula-
tions.
Figure 2.4 below shows some of the main features which can be used to identify the
new-design chassis and covers.
Figure 2.4 Identification Of New-Design Chassis & Covers
Top Cover
Bottom Cover
Chassis
4 holes in
rear panel
loom channel in
top of walls
groove in top
of rear wall
ridge on top
of rear wall
provision for mounting speaker
(future development)
additional walls
←Top View Rear View→

A2.6 Mechanical M880-00
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M880-00 Component Replacement A3.1
Copyright TEL 10/07/00
3 Component Replacement
3.1 Leaded Components
Whenever you are doing any work on the PCB that involves removing or fitting compo-
nents, you must take care not to damage the copper tracks. The two satisfactory meth-
ods of removing components from plated-through hole (PTH) PCBs are detailed below.
Note: The first method requires the use of a desoldering station, e.g. Philips SBC
314 or Pace MBT-100E.
3.1.1 Desoldering Iron Method
Place the tip over the lead and, as the solder starts to melt, move the tip in a circu-
lar motion.
Start the suction and continue the movement until 3 or 4 circles have been com-
pleted.
Remove the tip while continuing suction to ensure that all solder is removed from
the joint, then stop the suction.
Before pulling the lead out, ensure it is not stuck to the plating.
If the lead is still not free, resolder the joint and try again.
Note: The desoldering iron does not usually have enough heat to desolder leads
from the ground plane. Additional heat may be applied by holding a sol-
dering iron on the tip of the desoldering iron (this may require some addi-
tional help).
3.1.2 Component Cutting Method
Cut the leads on the component side of the PCB.
Heat the solder joint sufficiently to allow easy removal of the lead by drawing it
out from the component side: do not use undue force.
Fill the hole with solder and then clear with solderwick.

A3.2 Component Replacement M880-00
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3.2 Surface Mount Devices
Caution: Surface mount devices (SMDs) require special storage, handling,
removal and replacement techniques. This equipment should be serv-
iced only by an approved Tait Dealer or Customer Service Organisa-
tion equipped with the necessary facilities. Repairs attempted with
incorrect equipment or by untrained personnel may result in perma-
nent damage. If in doubt, contact your nearest Tait Dealer or Customer
Service Organisation.
3.3 Cased Mica Capacitors
Cased mica capacitors can be removed by heating the top with a heavy-duty soldering
iron and gently lifting the capacitor off the PCB with a solder-resistant spike or equiva-
lent.

M880-00 Software History A4.1
Copyright TEL 10/07/00
4 Software History
28/06/96 PGM800Win Version 1.0
18/08/97 PGM800Win Version 2.00
4.1 PGM800Win V1.0
PGM800Win V1.0 is different in concept from DOS versions of PGM800 in that it is Win-
dows1based. It also includes many new and improved features over DOS versions of
PGM800.
The major changes are outlined below:
• The Windowsenvironment makes data entry and editing significantly easier.
• PGM800Win includes several new radio models which are not programmable
with DOS versions of PGM800.
• Out of range frequencies will result in warning messages and will not be accepted
for entry into the standard library module. User defined modules can be created,
however, allowing variation from the standard library module.
• Channel numbers default to 0-127 to match the EPROM memory locations. How-
ever, the user can change this setting so that the channel numbers run from 1-128
to suit his/her particular needs.
Note: The data files produced by BASEPROG V1.0 and all DOS versions of
PGM800 are still compatible with PGM800Win V1.0.
4.2 PGM800Win V2.00
PGM800Win V2.00 is an upgraded and expanded version of PGM800Win V1.0. It has
been developed specifically for T800 Series II base stations, but retains the ability to pro-
gram Series I equipment.
The major changes are outlined below:
• PGM800Win V2.0 will program T800 Series II base station modules via serial com-
munications.
• Deviation and reference modulation settings are written automatically to the
radio.
1. Windows is a registered trademark of the Microsoft Corporation.

A4.2 Software History M880-00
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• Extra information that is not stored in the radio (but which is still relevant to the
radio) can be saved to a file on disk (e.g. note field, auxiliary pin names, etc.).
Note: The data files produced by BASEPROG V1.0, all DOS versions of PGM800,
and PGM800Win V1.0 are still compatible with PGM800Win V2.00.

M880-00 BI
Copyright TEL 10/07/00
Part B T885 Receiver
This part of the manual is divided into six sections, as listed below. There is a detailed
table of contents at the start of each section.
Section Title
1 General Information
2 Circuit Operation
3 Initial Tuning & Adjustment
4 Functional Testing (not available for Initial Adjustment manual)
5 Fault Finding (not available for Initial Adjustment manual)
6 PCB Information

BII M880-00
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