Voltage Measurement And Signal Tracing - Motorola ASTRO XTS 5000 Detailed Service Manual

Troubleshooting Procedures: Voltage Measurement and Signal Tracing
Motorola
Part Number
ChipMaster Nozzles:
6680333E28
6680332E83
6680332E93
6680332E82
6680332E94
6680332E95
6680332E96
6680332E89
6680332E90
6680332E91
6680334E67
6680332E86
6680333E46
6680332E84
6680332E87
6680333E45
6680332E88
6680333E54
6680333E55
* Included with ChipMaster packages
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.
!
C a u t i o n
6881094C31-E
Table 4-1. Recommended Service Tools (Continued)
Description
PA nozzle
PLCC-28* nozzle
PLCC-32 nozzle
PLCC-44* nozzle
PLCC-52 nozzle
PLCC-68* nozzle
PLCC-84 nozzle
QFP-80 nozzle
QFP-100* nozzle
QFP-132* nozzle
QFP-160 nozzle
SOIC-14/SOL-16J nozzle
SOL-18 nozzle
SOIC-20 nozzle
SOL-20J nozzle
SOL-24 nozzle
SOL-28J nozzle
TSOP-32 nozzle
TSOP-64 nozzle
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.
Application
Soldering and unsoldering ICs
4-3
November 16, 2006