6881076C25-E
September 5, 2008
Troubleshooting Procedures
: ASTRO Spectra Procedures
4-5
12. Power-up the EMC (if it is enabled in the codeplug).
13. Turn off the green LED.
14. Start up operating system.
15. Display for one second:
-
“SELF TEST” for the W3, model.
-
“SELF CHK” for the W4, W5, and W7 models.
-
“SELF CHECK” for the W9 models.
16. Turn off the green LED in the W3 model, or the TX and Busy LEDs in the W4, W5, W7, and
W9 models.
Display errors if a fatal error exists at this time.
4.1.4
RF Board Troubleshooting
This information will help you troubleshoot the ASTRO Spectra Radio RF board. Use this
information, along with the Theory of Operation, to diagnose and isolate the cause of failures. The
principal tools needed to troubleshoot a circuit to the component level are the schematic and the
Theory of Operation.
In addition to the schematic and theory, the following troubleshooting information identifies tests and
checks designed to help isolate problems.
Prior to troubleshooting, it is important to review the Theory of Operation, including specific
precautions and troubleshooting methods. Because much of the radio’s circuitry operates at high
frequencies, measurements must be taken very carefully. Notes and cautions are added to the text
to alert the reader to this need in areas of greatest sensitivity. However, the need for extreme care
does exist in all measurements and tests.
4.1.4.1 Display Flashes “FAIL 001”
This display indicates a synthesizer “out-of-lock” condition. Check the dc power supplies for the
correct voltages at the following locations:
1. If any of the dc voltages are not correct, troubleshoot the source of the supplied power and
correct the problem. If the voltages are correct, continue with the following checks.
2. Check U602, pin 19 for reference frequency, 0- to 9-V, square wave. If not correct, go to
“Incorrect Values at U602, pin 19”; otherwise, continue with the following checks.
3. Check U602, pin 25 for reference frequency, 0- to 9-V, square wave. If not correct, go to
“Incorrect Values at U602, pin 25 (MODULUS CONTROL)”; otherwise, continue with the
following checks.
4. Check the negative steering line, J601, pin 4. If correct, continue with the following checks.
Table 4-2. Voltage by Location
VOLTAGE
LOCATION
REMARKS
+5 Vdc
Q602 Collector
+8.6 Vdc
Q603 Collector
+5 Vdc
+3.25 Vdc
J500 pin 1
J500 pin 2
Power from command board to
reference oscillator
Содержание ASTRO Digital Spectra
Страница 1: ...ASTRO Digital Spectra and Digital Spectra Plus UHF VHF 800 MHz Mobile Radios Detailed Service Manual ...
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Страница 6: ...September 5 2008 6881076C25 E iv Document History Notes ...
Страница 20: ...xviii List of Tables September 5 2008 6881076C25 E Notes ...
Страница 24: ...September 5 2008 6881076C25 E xxii CommercialWarranty Notes ...
Страница 48: ...September 5 2008 6881076C25 E xlvi Model Numbering Charts and Specifications Notes ...
Страница 142: ...September 5 2008 6881076C25 E 3 82 Theory of Operation Power Amplifiers Notes ...
Страница 218: ...September 5 2008 6881076C25 E 4 76 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 258: ...September 5 2008 6881076C25 E 6 14 Troubleshooting Waveforms ASTRO Digital Spectra Plus VOCON Board Waveforms Notes ...
Страница 434: ...September 5 2008 6881076C25 E Glossary 10 Notes ...
Страница 440: ...Index 6 September 5 2008 6881076C25 E Notes ...
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