Motorola ASTRO SPECTRA Service Manual

6881076C20-E February 3, 2003
Basic Troubleshooting: Transmitter Troubleshooting 9-5
9.4.2 ASTRO Digital Spectra Plus
9.5 Transmitter Troubleshooting
The following table can help you troubleshoot problems that might occur in the transmitter section of
your radio.
Table 9-4. ASTRO Digital Spectra Plus Operational Error Codes
Error Code Description
Error
Type
Corrective Action
FAIL 001 Synthesizer Out-of-Lock NON-
FATAL
1. Reprogram codeplug
2. Replace RF board.
FAIL 002 Personality checksum or
system block error
NON-
FATAL
Reprogram codeplug.
Table 9-5. Transmitter Troubleshooting Chart
Symptom Possible Cause
Correction or Test (Measurements
Taken at Room Temperature)
No RF Power
Output
TX Power Level
Programming
Check TX power level programming (from
the appropriate radio programming
software).
No Keyed 9.4 Vdc from
Command Board
Check for keyed 9.4 Vdc on J500 pin 15
with transmitter keyed.
If none, replace the command board.
No Injection to Power
Amplifier
1. Check the lock line (J500 pin 14). If not
less than 2 Vdc, go to the Synthesizer
Troubleshooting Chart on
page 9-12.
2. Measure injection, which should be
> +18 dBm.
If low, replace the VCO board.
Power Amplifier Measure PA control voltage (P503 pin 2).
If >6 Vdc, replace the PA board.
Power Control Circuit If PA control voltage above was
<6 Volts, replace the command board.

Motorola ASTRO SPECTRA Specifications

General

Brand	Motorola
Model	ASTRO SPECTRA
Category	Radio
Language	English