Motorola Astro Digital Mobile Radio Xtl5000 Basic 6881096c73 O Manual

6881096C73-OJune 11, 2003
Basic Troubleshooting: Introduction9-3
9.1.2 I/O Disclaimer
Some of the signal lines on the J2 accessory connector (Figure 9-1, on page 9-1) are limited to 
between 0- and 5-volt operation. It is obvious that improper connections to any electronic device 
might result in damage. Some of the logic lines are limited to between 0 and 5 volts and other inputs 
between 0 and 20 volts. The exception is the UARTA, which can tolerate up to ±15 V maximum. At 
no time should any two (or...

June 11, 20036881096C73-O
9-4Basic Troubleshooting: Introduction
9.1.3 Microphone Bias
Most microphones are powered by a phantom power supply. This means that the bias to the 
electronics within the microphone is supplied as DC (direct-coupled) down the MIC_IN line. During 
PTT (push-to-talk or transmit), the microphone electronics are connected to this line and loads it 
down from 9 V to a bias voltage between about 3 to 6 volts. The AC load (or load line) is less than 
560 ohms at the radio due to AC...

6881096C73-OJune 11, 2003
Basic Troubleshooting: Replacement Board Procedures 9-5
9.1.4 Audio PA Out Bias
The audio PA is a BTL (bridge-to-load) amplifier. When the radio is in receiver mode, the output of 
both speaker leads bias up to half of the supply voltage. Considering that both leads are at the same 
potential, the average DC voltage across the load is zero. At maximum volume the signal voltage to 
the load is double that of one amplifier peak-to-peak because the amplifiers work together 180...

June 11, 20036881096C73-O
9-6Basic Troubleshooting: Power-Up Error Codes
ERROR 01/22 Tuning Codeplug 
ChecksumNON-FATAL Reprogram the tuning partition.
FAIL 01/81 FLASH ROM Checksum FATAL Reprogram the radio firmware.
FAIL 01/82 FLASH ROM Codeplug 
ChecksumFATAL Reprogram the codeplug.
FAIL 01/88 External SRAM Failure FATAL Turn the radio off, then on.
FAIL 01/90 General Hardware FATAL Turn the radio off, then on.
FAIL 01/92 Security Partition 
ChecksumFATAL Reprogram the security partition.
FAIL 01/93...

6881096C73-OJune 11, 2003
Basic Troubleshooting: Operational Error Codes 9-7
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 Table 9-4 to aid in understanding particular operational error codes.
9.5...

June 11, 20036881096C73-O
9-8Basic Troubleshooting: Receiver Troubleshooting
NOTE:“AC-coupled” is adding a 10 µf capacitor externally to prevent biasing on the MIC-HI line from 
being grounded.
9.6 Receiver Troubleshooting
Ta b l e 9 - 6 can help you troubleshoot problems that might occur in the receiver section of your radio.
Radio 
transmiits when 
programming 
cable is 
inserted into 
control headDamaged Flex Replace flex to control head.
Table 9-6.  Receiver Troubleshooting Chart
SymptomPossible...

6881096C73-OJune 11, 2003
Basic Troubleshooting: Receiver Troubleshooting 9-9
Radio Will Not 
SquelchCodeplug Check the offending channel for spurious activity 
by monitoring with a known-good radio or service 
monitor.
If possible, remove the offending source (computer, 
etc.).
If not, increase the squelch level using the 
appropriate radio-programming software.
Radio Will Not 
Turn OffOn/Off Switch (Control 
Head)Check for SW_B+ at 0 Vdc on pin 17 J0401 on the 
main board.
If SW_B+ is >1 Vdc, replace...

June 12, 20036881096C73-O
9-10Basic Troubleshooting: Receiver Troubleshooting
Notes 

Chapter 10 Functional Block Diagrams and Connectors
This chapter contains the ASTRO XTL 5000 digital mobile radio functional block diagrams and connector locations.
Table 10-1.  Table of Functional Block Diagrams and ConnectorsPage
Figure Name
10-2 Figure 10-1. ASTRO XTL 5000 Functional Block Diagram
10-3 Figure 10-2. J0103 Remote-Mount Control Head Connector
10-3 Figure 10-3. J5 Control Cable for Remote-Mount Control Head
10-3 Figure 10-4. J6 Radio Operations Connector
10-3 Figure 10-5. J3...

10-2Functional Block Diagrams and Connectors: XTL 5000 Functional Block Diagram
June 12, 2003 6881096C73-O10.1 XTL 5000 Functional Block Diagram
Figure 10-1.  ASTRO XTL 5000 Functional Block Diagram
VF VOLTAGE
SOURCE
MICROPROCESSOREEPROM
SERIAL BUSINTERFACE
SERIAL BUSINTERFACE
HIGH VOLTAGE VF DRIVER MICRO-
PROCESSOR
VACUUM
FLUORESCENT 8-CHARACTER
SPEAKER
REMOTE MOUNT MODELS
FUSEFUSE
BATT CABLE (GRN)
IGN. CABLE (ORG)
VIP IN/OUTREMOTE
INTERCONNECT BOARD HANDHELD
INTERCONNECT BOARD
DASH
INTERCONNECT BOARD...