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29 Self-Test
29.1 What is self test
Self-test is a part of the test program, which tests the communication or a limited part of the
function and also the revision on certain circuits.
The tests that self test performs are:
Check for the revision of the CPU (D600), DSP (D900), and analogue/digital ASIC (N800).
Check if it is possible to write in and read from the EE Prom (D630).
Check the communication between the CPU and the DSP.
Analogue ASIC measures the battery voltage (VTRACK) with ADC.
If the DAC-value is between 14 - A5 the test is passed.
The CPU tests the RTC by setting the clock and then check it twice to make sure it works.
The phone must have been powered up at least 10 s before performing Self test
A correctly performed test should look like Fig. 29.1. below.
29.2 Chip revision (CPU, SDSP and AASIC).
This selftest does not detect faults.
The test is only for checking the revisions of D600, D900 and N800.
4/00021-3/FEA 209 544/18 B
Fig.29.1
Trouble Shooting Guide, Advanced
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