6881094C31-E
November 16, 2006
Troubleshooting Procedures:
Voltage Measurement and Signal Tracing
4-3
4.3
Voltage Measurement and Signal Tracing
It is always a good idea to check the battery voltage under load. This can be done by checking the
OPT_B+_VPP pin at the side connector (pin 4). The battery voltage should remain at or above
7.0 Vdc. If the battery voltage is less than 7.0 Vdc, then it should be recharged or replaced as
necessary prior to analyzing the radio.
In most instances, the problem circuit may be identified using a multimeter, an RF millivoltmeter,
oscilloscope (preferably with 100 MHz bandwidth or more), and a spectrum analyzer.
ChipMaster Nozzles:
6680333E28
PA nozzle
Soldering and unsoldering ICs
6680332E83
PLCC-28* nozzle
6680332E93
PLCC-32 nozzle
6680332E82
PLCC-44* nozzle
6680332E94
PLCC-52 nozzle
6680332E95
PLCC-68* nozzle
6680332E96
PLCC-84 nozzle
6680332E89
QFP-80 nozzle
6680332E90
QFP-100* nozzle
6680332E91
QFP-132* nozzle
6680334E67
QFP-160 nozzle
6680332E86
SOIC-14/SOL-16J nozzle
6680333E46
SOL-18 nozzle
6680332E84
SOIC-20 nozzle
6680332E87
SOL-20J nozzle
6680333E45
SOL-24 nozzle
6680332E88
SOL-28J nozzle
6680333E54
TSOP-32 nozzle
6680333E55
TSOP-64 nozzle
* Included with ChipMaster packages
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. Recommended Service Tools (Continued)
Motorola
Part Number
Description
Application
!
C a u t i o n
Summary of Contents for ASTRO XTS-5000
Page 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Page 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Page 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Page 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Page 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Page 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Page 373: ...Index 6 November 16 2006 6881094C31 E Notes ...