Access To Signals; Specific Digital And Power Supply Test Points - Nokia RM-235 Service Manual

RM-235
FMTx 2.0 troubleshooting

Access to signals

Note: Pin 1 has been indicated purely as a reference.
Figure shows possible access points for monitoring/measuring the various signals of the FMTx 2.0 solution.
Typical voltage levels, waveforms and frequencies have been indicated where appropriate.

Specific digital and power supply test points

Using access to signals figure as a reference it can be seen that supplies to the Si4713 device VIO (pin 10) and
VDD (pin 11) can be accessed easily. The FMTx 2.0 solution utilises a QFN package. This type of package lends
itself well to analysis of signals on the various pins of the device.
VIO & VDD
VIO should be in the range 1.5 to 3.6 Volts.
VDD should be in the range 2.7 to 5.5 Volts.
Issue 1
Figure 42 Access to signals
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