Motorola Astro Digital Spectra Digital Spectra Plus Basic 6881076c20 E Manual

6881076C20-EFebruary 3, 2003
Basic Troubleshooting: Power-Up Error Codes 9-3
9.3.2 ASTRO Digital Spectra Plus
Table 9-2.  ASTRO Digital Spectra Plus Power-Up Error Codes
Error CodeDescriptionError 
Ty p eCorrective Action
ERROR 01/02 FLASH ROM Codeplug 
ChecksumNON-
FATA LReprogram the codeplug.
ERROR 01/12 Security Partition 
ChecksumNON-
FATA LReprogram the security 
partition.
ERROR 01/22 Tuning Codeplug 
ChecksumNON-
FATA LReprogram the tuning 
partition.
FAIL 01/81 FLASH ROM Checksum FATAL Reprogram...

February 3, 20036881076C20-E
9-4Basic Troubleshooting: Operational Error Codes
9.4 Operational Error Codes
During radio operation, the radio performs dynamic tests to determine if the radio is working properly. 
Problems detected during these tests are presented as error codes on the radio’s display. The 
presence of an error code should prompt a user that a problem exists and that a service technician 
should be contacted. Use the following tables to aid in understanding particular operational error...

6881076C20-EFebruary 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 CodeDescriptionError 
Ty p eCorrective Action
FAIL 001 Synthesizer Out-of-Lock NON-
FATA L1. Reprogram codeplug
2. Replace RF board.
FAIL 002 Personality checksum or 
system...

February 3, 20036881076C20-E
9-6Basic Troubleshooting: Transmitter Troubleshooting
No Modulation VCO Board 1. All modulation testing should be done 
with the radio keyed and 1Vrms on the 
microphone high line of the microphone.
2. Is radio properly tuned? (See Chapter 
6. Radio Alignment Procedure.)
3. Is there > 400 mVrms at J500 pin 11?
If so, replace the VCO board.
Command Board If there is > 400 mVrms (ac coupled) at 
P501 pin 49 and not at J500 pin 11, 
replace the command board.
VOCON Board If...

6881076C20-EFebruary 3, 2003
Basic Troubleshooting: Transmitter Troubleshooting 9-7
Bad 
Microphone 
SensitivityCheck Deviation and 
CompensationRetune, if necessary.
Microphone Speak loudly into the microphone while 
monitoring the microphone line (pin 6 of 
P502).
If it is not >80 mVrms, then replace the 
microphone.
Command Board With 80 mVrms on the mic high line, check 
pin 39 of P501.
If not >100 mVrms (ac coupled), replace 
the command board.
VOCON  Board With 80 mVrms on the mic high line, check...

February 3, 20036881076C20-E
9-8Basic Troubleshooting: Transmitter Troubleshooting
NOTE:The P501 pins can be probed on the extender cable (see the P501 Extender Cable 
diagram on 
page 10-6).
Can’t Set 
CompensationVOCON Board Vary deviation and compensation controls 
from maximum to minimum.
With the low frequency source active 
(using the appropriate radio programming 
software–see 
Chapter 6: Radio 
Alignment Procedure
) voltage or pin 48 
of P501 should vary from 3 mVrms.
With the high frequency...

6881076C20-EFebruary 3, 2003
Basic Troubleshooting: Receiver Troubleshooting 9-9
9.6 Receiver Troubleshooting
The following table can help you troubleshoot problems that might occur in the receiver section of 
your radio.
Table 9-6.  Receiver Troubleshooting Chart
SymptomPossible CauseCorrection or Test (Measurements Taken 
at Room Temperature)
Radio Dead, 
Display Does 
Not Light UpBlown Fuse Check fuse in red lead of power cable (or green 
lead if used.)
On/Off Switch (Control 
Head)Check for SWB+ at...

February 3, 20036881076C20-E
9-10Basic Troubleshooting: Receiver Troubleshooting
No Receiver 
Audio or 
Receive Does 
Not UnsquelchAudio PA Circuit 1. Check codeplug to ensure correct frequency 
and signaling (PL, DPL) is enabled (use the 
appropriate radio programming software).
2. Check continuity of F500 on command board.
If open, check for speaker leads shorted to 
ground. Replace, if necessary.
Regulators (Command 
Board)Check for 9.6 Vdc on pin 10 of J500 and +5V on 
pin 1 of J500.
If not there,...

6881076C20-EFebruary 3, 2003
Basic Troubleshooting: Receiver Troubleshooting 9-11
RF Sensitivity 
PoorSynthesizer Not On 
Frequency/WorkingCheck local oscillator frequency.
If off by more than 250 Hz, then go to the 
Synthesizer Troubleshooting Chart (
page 9-12).
Antenna Switch 
(Amplifier Board)Check insertion loss from antenna connector to 
Rx front end coax from the PA.
If loss is less than 1.8 dB, then the problem is in 
the transceiver housing.
Receiver Front-End 
Assembly or VCO 
Board1. Measure...

February 3, 20036881076C20-E
9-12Basic Troubleshooting: Synthesizer Troubleshooting
NOTE:The P501 pins can be probed on the extender cable (see the P501 Extender Cable 
diagram on 
page 10-6).
9.7 Synthesizer Troubleshooting
The following table can help you troubleshoot problems that might occur in the synthesizer section of 
your radio.
Table 9-7.  Synthesizer Troubleshooting Chart
SymptomPossible CauseCorrection or Test (Measurements 
Taken at Room Temperature)
Does Not Lock 
on Any 
ChannelVCO With...