Service manual

Chapter 5 E01S Fault finding
FileStore Service Manual 80
5.2 Initialisation
If you have a suitable printer available, plug it into the unit and turn it on. Open the units
Access flap and then turn the unit on, while observer the printer as you turn it on. If the
printer performs a line feed, refer to section 5.3 Net Link.
If the printer does not perform a line feed, check the following with an oscilloscope:
Test For
Processor clock: 2MHz on pin 3 and 39 of IC16
NMI line: High on pin 6 if IC16
RTC frequency: 1024 Khz at TPI (at IC1)
Address lines: for activity (at IC16)
Data lines: for activity (at IC16)
5.3 Net link
If it appears that the link to the network is failing, the most common causes are:
Symptom Action
Net module faulty Replace net module
No clock Check clock path and enable
Line jammed Check for approximately 0.3V across the data pair
5.4 Final checks
If the procedures outlines above fail to uncover the fault, then as a final check you should
refer to Appendix A – Test Equipment at the back of this manual, which contains more
thorough tests of the FileStore.
The tests to run and the order in which to run them are as follows:
 Run all the tests in FServTest
 Run FServFmt on each disc
 Run FServInit on each disc
 Run FServSoak, running all the test patterns on each disc.