Service manual

Contents
About this manual
Part 1 - Fault diagnosis and repair 1-1
Introduction 1-1
Test equipment required 1-1
Checking a 'dead' computer 1-1
Action if PSU fails 1-3
Action if main PCB fails 1-3
Action if upgrades fail 1-3
What to do next 1-4
Checking a partly working computer 1-4
Before the tests 1-4
Safety considerations 1-4
Backing up the test disc 1-4
Validating the test equipment 1-4
Creating a test IDE hard disc 1-6
Replacing the customer's hard disc 1-6
Connecting the customer's equipment 1-6
Saving the customer's CMOS RAM settings 1-7
Creating a CMOS test data file 1-7
Checking the memory size 1-7
About the tests 1-8
How to operate the test software 1-8
Repairing faults 1-8
Running the functional tests 1-8
Memory test 1-9
Battery backed RAM test 1-9
IDE hard disc drive interface test 1-9
Hardware check 1-10
External port tests 1-10
Disc interface test 1-11
Real time test 1-12
Audio tests 1-12
Video tests 1-12
Keyboard and mouse tests 1-14
Test report 1-16
Additional individual tests 1-16
Hard disc exerciser 1-16
Hard disc formatter 1-16
After the tests 1-17
Performing soak tests 1-17
Performing safety tests 1-17
Retesting the unit 1-17
Restoring the CMOS RAM settings 1-19
Contents Issue 1, November 1991 III