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Motorola Astro Digital Mobile Radio Xtl5000 Detailled 6881096c74 B Manual

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Page 141

6881096C74-BMay 25, 2005
Theory of Operation: Controller Section3-75
Figure 3-50.  XTL 5000 TX Signal Path
After the DSP has finished its processing, filtering, and signaling on the audio data samples, it then 
sends this data to the modulation DAC (U0900) on the BBP SSI port, where it is converted to the 
analog modulation signal. The data is clocked over to the modulation DAC at a 2.4 MHz bit rate, with 
a frame sync (representing the transmit data sample rate) of 48 kHz. Both of these clocks are...

Page 142

May 25, 20056881096C74-B
3-76Theory of Operation: Controller Section
The standard method of upgrading a radios software and communicating between a computer and 
the radio microcontroller involves the use of the UART path via the programming cable. The radio is 
placed in a bootstrap mode whenever the programming cable is inserted into either the control- head 
microphone connector (P104) or the remote-mount interconnect board data connector (P506). This 
cable applies SW_B+ to the MIC_HI line (J0401-4),...

Page 143

6881096C74-BMay 25, 2005
Theory of Operation: Controller Section3-77
For a list of all available programming cables, refer to the table below.
NOTE:In remote-mount configurations, the control head 10-pin microphone port is disabled for any 
kind of programming.
NOTE:FLASH IC replacement is not supported as a field repair option. If the FLASH IC is removed, 
the radio cannot be reflashed by a customer or radio depot. This is because the FLASH IC 
must be hard-boot loaded at the factory to allow the...

Page 144

May 25, 20056881096C74-B
3-78Theory of Operation: Controller Section
Notes 

Page 145

Chapter 4 Troubleshooting Procedures
4.1 Introduction
This section will aid you in troubleshooting a malfunctioning XTL 5000 radio. It is intended to be 
detailed enough to localize the malfunctioning circuit and isolate the defective component.
4.2 Handling Precautions
Complementary metal-oxide semiconductor (CMOS) devices and other high-technology devices, are 
used in the XTL 5000 radio. While the attributes of these devices are many, their characteristics 
make them susceptible to damage by...

Page 146

May 25, 20056881096C74-B
4-2Troubleshooting Procedures: Handling Precautions
4.2.2 Rigid Circuit Boards
The XTL 5000 radio uses bonded, multi-layer, printed circuit boards. Since the inner layers are not 
accessible, special considerations are required when soldering and unsoldering components. The 
printed-through holes might interconnect multiple layers of the printed circuit. Therefore, care should 
be exercised to avoid pulling the plated circuit out of the hole.
When soldering near module socket...

Page 147

6881096C74-BMay 25, 2005
Troubleshooting Procedures: Voltage Measurement and Signal Tracing 4-3
4.3 Voltage Measurement and Signal Tracing
In most situations, the problem circuit may be identified using a DC voltmeter, RF millivoltmeter, and 
oscilloscope (preferably with 100 MHz bandwidth or more). The “Recommended Test Equipment, 
Service Aids, and Tools” section in the ASTRO Digital XTL 5000 VHF/UHF Range 1/UHF Range 2/
700–800 MHz Mobile Radio Basic Service Manual (6881096C73) outlines the...

Page 148

May 25, 20056881096C74-B
4-4Troubleshooting Procedures: Power-Up Self-Check Errors
FAIL 01/88 External RAM Error FATAL • Turn the radio off, then on.
• Hard bootstrap and flash the 
firmware.
• Replace the daughtercard.
FAIL 01/90 General Hardware FATAL • Turn the radio off, then on.
• Replace the control head or flex.
FAIL 01/92 Security Partition 
ChecksumFATAL Re-flash the codeplug sections.
FAIL 01/93 FlashPORT AUTHENT 
CODE FailureFATAL Re-flash the appropriate base 
codeplug to match the radio...

Page 149

6881096C74-BMay 25, 2005
Troubleshooting Procedures: Operational Error Codes 4-5
4.5 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. Table 4-2 will aid in understanding particular operational error codes.
4.6 VHF...

Page 150

May 25, 20056881096C74-B
4-6Troubleshooting Procedures: VHF (136–174 MHz) Band Main Board Troubleshooting
2. To determine if the out-of-lock is frequency or VCO dependant, place the unit into RF TEST 
Mode, as described in the ASTRO Digital XTL 5000 VHF/UHF Range 1/UHF Range 2/700–
800 MHz Mobile Radio Basic Service Manual (6881096C73) and step through each test 
channel. Table 4-3 indicates the frequency and Aux logic level for each test mode channel. In 
addition, Table 4-4 provides information about...
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