Conditions - Ericsson PF 768 Troubleshooting Instructions

PF768, Standard Electrical Repairs

1 Conditions

1.1 Component classes.
All the components in the phone are divided into classes and after every component
in the troubleshooting guide you have a class written. The components are divided
into four classes: A, B, C and D.The class of the component depends on how much
of the phone's performance is affected when replacing it.
Class A and B:A test call towards the "real" net (not only towards a GSM test
Class C:
Class D:
instrument) and run it through the normal tests is enough to verify the
functionality since the performance of the phone is only slightly
affected.
Since the tolerances of the component are so great it can substantially
affect the performance of the phone you need to calibrate it at station
level after replacing the component.
Class D components need to be calibrated at board level using very
advanced equipment and may therefore not be replaced.
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