Servicing Personal Computers, 3rd Edition

Fault diagnosis 103

really is defective, it may be replaced by another of the same type and then functional tests

carried out to ascertain whether or not the fault has been cleared. In some cases, however, the

fault may recur and it will then be necessary to examine the cause of failure. This may lie

elsewhere in the circuit since some faults give rise to a 'knock-on' effect where one

component failure leads to another.

Wherever possible during the fault finding process, reference should be made to the

manufacturer's service manual for the microcomputer concerned. Owner's operating manuals

supplied with the equipment rarely contain sufficien ...