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T850 II Series
Service manual
Tait T850 II Series Service Manual
Base station equipment 400-520mhz
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Contents
Table of Contents
Bookmarks
Table of Contents
Part a Introduction to Servicing
Table of Contents
1 General
Additional Technical Information
Caution: CMOS Devices
Caution: Aerial Load
Caution: Beryllium Oxide & Power Transistors
2 Mechanical
Torx Recess Head Screws
Pozidriv & Philips Recess Head Screws
Disassembly/Reassembly
Receivers/Exciters/Transmitters
Power Amplifiers
Cover Screw Torques
3 Component Replacement
Leaded Components
Desoldering Iron Method
Component Cutting Method
Surface Mount Devices
Cased Mica Capacitors
4 Software History
Pgm800Win V1.0
Pgm800Win V2.00
T855 General Information
T855 General Information
Introduction
Specifications
Introduction
General
RF Section
Audio Section
General
Ctcss
Mute Operation
Microprocessor Controller
Test Standards
European Telecommunication Standard (ETS)
DTI CEPT Recommendation T
Telecommunications Industry Association
Product Codes
Standard Product Range
T855 Circuit Operation
Introduction
T855 Circuit Operation
Receiver Front End
IF Circuitry
Mixer
Carrier Mute
Noise Mute (Squelch)
Audio Processor
Power Supply and Regulators
Microcontroller
Synthesised Local Oscillator
Vco
Received Signal Strength Indicator (RSSI)
Title
Audio Processor Links
General
Audio Processor Linking Details for CTCSS
Alignment of Receiver Front End and if
Synthesiser Alignment
Carrier Level Mute
Gating Delay
Noise Mute Adjustment
Audio Processor
Line Amplifier Output
Monitor Amplifier Output (Speaker Output)
Ctcss
Decoder Operation
Opening Sinad
High Pass Filter
Rssi
T855 Functional Testing
Figure
Current Consumption
Sensitivity
Switching Range
Audio Distortion
Ultimate Signal-To-Noise Ratio
De-Emphasised Audio Frequency Response
Noise Mute (if Linked In)
RSSI (if Fitted)
Carrier Level Mute (RSSI Fitted & Carrier Mute Linked In)
Title
Pgm800Win Generated Errors
Fault Finding Charts
Microcontroller (IC810)
Basic Checks
Serial Communication
CTCSS Decode
Regulator
Synthesiser
Noise Mute
Carrier Mute
Receiver
Audio
T856/857 General Information
Introduction
Specifications
Introduction
General
RF Section
Audio Processor
Inputs
Modulation Characteristics
Ctcss
Microcontroller
Test Standards
European Telecommunication Standard
DTI CEPT Recommendation T
Telecommunications Industry Association
Product Codes
T858/859 Fault Finding
General
PA Faults
Voltage Chart
Fault Finding Charts
T858 Pa
T858 Power Control
T859 Pa
T859 Power Control
T859 Fan Control Circuitry
Removing the PCB from the Heatsink
Part G System Configurations
1 T855 Link Selectable Features
Flat or De-Emphasised Response
Mute Selection
Receiver Disable
CTCSS Configuration
300Hz High Pass Filter
Audio Processor Links
General
Audio Processor Linking Details for CTCSS
2 T856/857 Optional Features
Audio Processor
Link Details
Typical Options
Line Transformer Inputs and Outputs
Opto Key
Relay Driver
3 Talk through Repeater
4 Line Controlled Base Without Talk through
Transmitter Tail Timer
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1
M850-00
T850 Series II
Base Station Equipment
400-520MHz
Service Manual
Issue 200
October 1998
M850-00-200
Copyright TEL
31/09/98
Table of
Contents
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Page
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Page
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Chapters
Part a Introduction to Servicing
13
T855 General Information
27
T855 Circuit Operation
41
Title
54
T855 Functional Testing
67
Title
76
T856/857 General Information
125
T858/859 Fault Finding
265
Part G System Configurations
323
Table of Contents
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This manual is also suitable for:
T855
T856
T857
T858
T859
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