Astro Digital Spectra; Astro Digital Spectra Plus; Transmitter Troubleshooting; Table 9-4. Astro Digital Spectra Plus Operational Error Codes - Motorola ASTRO SPECTRA Service Manual

Basic Troubleshooting: Transmitter Troubleshooting
9.4.2

ASTRO Digital Spectra Plus

Table 9-4. ASTRO Digital Spectra Plus Operational Error Codes

Error Code
FAIL 001
FAIL 002
9.5

Transmitter Troubleshooting

The following table can help you troubleshoot problems that might occur in the transmitter section of
your radio.
Symptom
No RF Power
Output
6881076C20-E
Description
Synthesizer Out-of-Lock
Personality checksum or
system block error

Table 9-5. Transmitter Troubleshooting Chart

Possible Cause
TX Power Level
Programming
No Keyed 9.4 Vdc from
Command Board
No Injection to Power
Amplifier
Power Amplifier
Power Control Circuit
Error
Corrective Action
Type
NON- 1. Reprogram codeplug
FATAL 2. Replace RF board.
NON- Reprogram codeplug.
FATAL
Correction or Test (Measurements
Taken at Room Temperature)
Check TX power level programming (from
the appropriate radio programming
software).
Check for keyed 9.4 Vdc on J500 pin 15
with transmitter keyed.
If none, replace the command board.
1. Check the lock line (J500 pin 14). If not
less than 2 Vdc, go to the Synthesizer
page 9-12
Troubleshooting Chart on
2. Measure injection, which should be
> +18 dBm.
If low, replace the VCO board.
Measure PA control voltage (P503 pin 2).
If >6 Vdc, replace the PA board.
If PA control voltage above was
<6 Volts, replace the command board.
9-5
.
February 3, 2003