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
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a u t i o
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