Motorola ASTRO XTL 1500 Detailed Service Manual page 11

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4.9 700-800 MHz Main Board Troubleshooting.................................................................................4-22
4.9.1 Display Flashes "FAIL 001" .............................................................................................4-23
4.9.2 FGU Troubleshooting Aids ..............................................................................................4-24
4.9.3 No or Low Output Power (TX or RX Injection) ................................................................4-28
4.9.4 No or Low Modulation .....................................................................................................4-28
4.9.5 Troubleshooting the Back-End ........................................................................................4-28
4.10 Standard Bias Tables ...................................................................................................................4-28
4.11 Receiver Front-End (RXFE) .........................................................................................................4-32
4.11.1 VHF (136-174 MHz) Band ..............................................................................................4-32
4.11.2 UHF Range 1 (380-470 MHz) Band ...............................................................................4-32
4.11.3 UHF Range 2 (450-520 MHz) Band ...............................................................................4-33
4.11.4 700-800 MHz Band.........................................................................................................4-33
4.12 Power Amplifier Procedures.........................................................................................................4-33
4.12.1 VHF (136-174 MHz) Band ..............................................................................................4-33
4.12.1.1 50-Watt Power Amplifiers.......................................................................................4-33
4.12.1.2 General Troubleshooting and Repair Notes...........................................................4-33
4.12.2 UHF Range 1 (380-470 MHz) Band ...............................................................................4-34
4.12.3 UHF Range 2 (450-520 MHz) Band ...............................................................................4-34
4.12.4 700-800 MHz Band.........................................................................................................4-34
Chapter 5 Troubleshooting Charts ......................................................5-1
5.1 Introduction.....................................................................................................................................5-1
5.2 List of Troubleshooting Charts .......................................................................................................5-1
5.3 Troubleshooting Tables..................................................................................................................5-3
5.3.1 For VHF, UHF R1 and 700-800 MHz models....................................................................5-3
5.3.2 For UHF R2 Models ..........................................................................................................5-6
5.4 Troubleshooting Test Points.........................................................................................................5-10
5.5 Board ID Jumper Configuration....................................................................................................5-10
5.6 Flowcharts ....................................................................................................................................5-11
5.6.1 Poor RX Sensitivity or No RX Audio (136-174 MHz)-Part 1 of 2..................................5-12
5.6.2 Poor RX Sensitivity or No RX Audio (136-174 MHz)-Part 2 of 2..................................5-13
5.6.3 RX IF-Poor SINAD or No Audio (136-174 MHz) ..........................................................5-14
5.6.4 RX Back-End-Poor SINAD or No Audio (136-174 MHz)-Part 1 of 3..........................5-15
5.6.5 RX Back-End-Poor SINAD or No Audio (136-174 MHz)-Part 2 of 3..........................5-16
5.6.6 RX Back-End-Poor SINAD or No Audio (136-174 MHz)-Part 3 of 3..........................5-17
5.6.7 Low or No RX Injection Signal (136-174 MHz)...............................................................5-18
5.6.8 Low or No TX Injection Signal (136-174 MHz) ...............................................................5-19
5.6.9 TX or RX VCO Unlock (Fail 001) (136-174 MHz)-Part 1 of 2.......................................5-20
5.6.10 TX or RX VCO Unlock (Fail 001) (136-174 MHz)-Part 2 of 2.......................................5-21
5.6.11 No Output Power at TX Mode (136-174 MHz) ...............................................................5-22
5.6.12 No Output Power and IDC < 2A at TX Mode (136-174 MHz).........................................5-23
5.6.13 No 16.8 MHz Reference Oscillator Frequency (380-470 MHz and 450-520 MHz)........5-24
5.6.14 Poor RX Sensitivity or No RX Audio (380-470 MHz and 450-520 MHz)-Part 1 of 2 ...5-25
5.6.15 Poor RX Sensitivity or No RX Audio (380-470 MHz and 450-520 MHz)-Part 2 of 2 ...5-26
5.6.16 RX IF-Poor SINAD or No Audio (380-470 MHz and 450-520 MHz)-Part 1 of 2........5-27
5.6.17 RX IF-Poor SINAD or No Audio (380-470 MHz and 450-520 MHz)-Part 2 of 2........5-28
5.6.18 RX Back-End-Poor SINAD or No Audio (380-470 MHz and 450-520 MHz)-
Part 1 of 3........................................................................................................................5-29
5.6.19 RX Back-End-Poor SINAD or No Audio (380-470 MHz and 450-520 MHz)-
Part 2 of 3........................................................................................................................5-30
5.6.20 RX Back-End - Poor SINAD or No Audio (380-470 MHz and 450-520 MHz)-
Part 3 of 3........................................................................................................................5-31
June 15, 2005
Table of Contents
6815854H01-A