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Basic Maintenance
Handling
Precautions
4
Complementary metal-oxide semiconductor (CMOS) devices, and other high-technology
devices, are used in this family of radios. While these devices have many attributes, their
characteristics make them susceptible to damage by electrostatic discharge (ESD) or high-
voltage charges. Damage can be latent, resulting in failures occurring weeks or months
later. Therefore, special precautions must be taken to prevent device damage during
disassembly, troubleshooting, and repair. Handling precautions are mandatory for this
radio, and are especially important in low-humidity conditions.
Never heat the RF PA above 210°C while performing repair or rework procedures to
maintain its integrity. Utilizing a Chipmaster (R1319 or R1321) top-side set point of 215°C
and a Dragon (R1427) bottom-side pre-heat set point of 180°C has proven to satisfy this
condition during the rework of the RF PA (note: the RF PA temperature does not reach the
Chipmaster's internal set point temperature). All other parts on the transceiver board can
be reworked with Chipmaster top-side heat alone.
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Troubleshooting
