Re: Is my Tek 468 beyond repair?

Roger Evans

Page 328 of the Tek 468 Service Manual at KO4BB .com (linked to from Tek Wiki) shows how to isolate the analogue and digital portions of a 468 to verify that the analogue section works correctly 'stand alone'.

Page 330 lists a series of basic tests on the processor board unfortunately it is not specific about which of these rely on the ROMs being correct. You would need another scope to do the testing and it would be useful to know how far down the list you can go before you stop seeing the expected signals. Signals like the 5MHz and 2.5MHz clock, ALE and some activity on RD and WR would indicate that the processor is at least operating even if it doesn't have the correct op codes in the ROMs.



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