6815854H01-A
June 15, 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 1500 VHF/UHF Range 1/UHF Range 2/
700–800 MHz Mobile Radio Basic Service Manual
(6815853H01) outlines the recommended tools
and service aids which would be useful. Of special note are:
• 30-80370E06 Extender Cable which provides an extension cable for VOCON board connector
J501 and command board connector P501
• RPX-4725C Command and Control Service Cable Kit which provides extension cables for
servicing digital and analog circuits
• RPX-4724B RF Service Cable Kit which provides interface cables needed to service the RF
boards
In some cases DC voltages at probe points are shown in red on the schematics. In other areas
diagrams are included to show time-varying signals, which should be present under the indicated
circumstances. It is recommended that a thorough check be made prior to replacement of any IC or
part. If the probe point does not have a signal reasonably close to the indicated one, a check of the
surrounding components should be made prior to replacing any parts.
4.4
Power-Up Self-Check Errors
When the radio is turned on (power-up), the radio performs cursory tests to determine if its basic
electronics and software are in working order. Problems detected during these tests are presented
as error codes on the radio’s display. The presence of an error should prompt the user that a
problem exists and that a service technician should be contacted.
Self-test errors are classified as either fatal or non-fatal. Fatal errors inhibit user operation; non-fatal
errors do not.
will aid in understanding particular power-up error code displays.
When checking a transistor or module, either in or out of
circuit, do not use an ohmmeter having more than 1.5 Vdc
appearing across test leads or use an ohms scale of less than
x100.
Table 4-1. Power-Up Self-Check Error Codes
Error Code
Description
Error Type
Corrective Action
ERROR 01/02
FLASH ROM Codeplug
Checksum
NON-FATAL
Re-flash the entire codeplug.
ERROR 01/12
Security Partition
Checksum
NON-FATAL
Re-flash the codeplug sections.
ERROR 01/20
ABACUS Tune Failure
NON_FATAL • Turn the radio off, then on.
• Re-flash tuning (codeplug).
• Replace ABACUS IC / resolder.
ERROR 01/22
Tuning Codeplug
Checksum
NON-FATAL
• Re-flash tuning (codeplug).
• Retune the radio using CPS.
FAIL 01/81
FLASH ROM Checksum
FATAL
Re-flash the firmware.
FAIL 01/82
FLASH ROM Codeplug
Checksum
FATAL
Re-flash the codeplug or
firmware.
!
C a u t i o n
Содержание XTL 1500
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