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T800 SL2 25W
Tait T800 SL2 25W User Manual
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B5.12
T855 Fault
Finding
M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
5.7.2
Regulator
Check for
overheating
components &
short circuits.
13.8V present on
IC630 pin 3?
5.3V present on
IC630 pin 1?
Check Q620,
Q630 & IC640.
Check Q660 is
switching at
approx. 180kHz
.
Replace IC630.
Check R615.
Replace IC610.
Check continuity
from D-range
connector pin 9.
(D-range 1)
N
Y
N
Y
N
Y
N
Y
N
Regulators OK.
Y
20V present
on TP603?
9.0V present
on TP602?
5V present on
IC610 pin 1?
77
79
Table of Contents
About this Manual
3
Publication Information
4
Additional Technical Information
11
Torx Recess Head Screws
13
Cover Screw Torques
15
Component Replacement
17
Surface Mount Devices
18
Cased Mica Capacitors
18
Specifications
26
Microprocessor Controller
30
Test Standards
30
Receiver Front End
36
Noise Mute (Squelch)
38
Carrier Mute
38
Audio Processor
39
Power Supply and Regulators
40
Synthesised Local Oscillator
42
Received Signal Strength Indicator (RSSI)
44
Channel Programming
47
Test Equipment Required
48
Short Tuning Procedure
49
Front End Alignment
49
Mute Adjustment
50
Line Amplifier Output
50
Audio Processor Links
52
Synthesiser Alignment
54
Gating Delay
56
Carrier Level Mute
56
Audio Processor
57
High Pass Filter
58
Current Consumption
61
Switching Range
61
Audio Distortion
62
Ultimate Signal-To-Noise Ratio
62
De-Emphasised Audio Frequency Response
63
Noise Mute (if Linked In)
64
Visual Checks
69
Component Checks
69
Front Panel LED Indicator
69
VCO Locking
70
Mute Operation
70
VCO Frequency
71
Oscillator Stability
72
Demodulator Output
72
Pgm800Win Generated Errors
74
Fault Finding Charts
75
Basic Checks
75
Serial Communication
76
Noise Mute
82
Carrier Mute
83
Product Type Identification
89
PCB Identification
89
Parts Lists
90
Specifications
136
VCO Supply
147
Audio Processor
148
Audio Inputs
148
Keying Inputs
149
Outputs to Modulators
149
Transmit Timers
151
Output Power Adjustment
159
Two Point Modulation Adjustment
160
FM Deviation (Limiter) Adjustment
161
Line-In Level Adjustment
161
Link Details
162
Typical Options
162
Thermal Shutdown
164
Alarm Board
169
Equipment Required
174
Output Power
179
Output Frequency
179
Frequency Response
181
PCB Identification
207
Parts Lists
208
General Information
243
Other Features
246
Specifications
249
Morse Code
251
System Configuration
253
Product Codes
254
Regulatory Information
254
Circuit Operation
259
Circuit Overview
261
Alarm Monitoring
263
Alarm Type
264
Installation and Configuration
269
Backplane Configuration
271
Line Interface
274
Test Modes
277
Fault Finding
283
PCB Identification
289
Parts Lists
289
PCB Identification
309
Parts Lists
309
Specifications
322
EMC Conformity
324
Safety Approvals
325
Power Supply Description
327
Connector Pinouts
329
Equipment Cooling
330
Functional Testing
331
Basic Operation
331
Output Noise
332
Troubleshooting
333
Service Information
335
Wiring Diagram
336
Assembly Drawing
337
Power Supply
341
Audio Processor
351
Relay Driver
355
Talk through Repeater
357
External Frequency Reference
383
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Tait T800 SL2 25W Specifications
General
Brand
Tait
Model
T800 SL2 25W
Category
Accessories
Language
English
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