24 Oct
2005
24 Oct
'05
1:19 p.m.
From: "Tequi Lizer" <tequilizer at
gmx.net>
I recently acquired a HP 9845C option 280 (was looking for it for a
really long time).
The machine is in an overall good condition, however it hangs during
memory test ("MEMORY TEST IN PROGRESS"), even after cleaning all board
connectors, resocketing all ROMs & repeated control-stop's. Before
entering nirvana the printer outputs a couple of memory addresses.
Although lots of defects may be responsible, I assume there is a
combination of both a bad RAM chip and a ROM failure, since a RAM defect
alone should (?) not crash the system during the test.
The printout looks like this:
000000 100112 052525
000000 110112 052525
000000 120112 052525
000000 130112 052525
---snip---
Hi
It looks like it is more likely that you are having a data bus
buffer or address buffer issue than a massive RAM/ROM failure.
You might look at things with a 'scope or logic analyser.
Dwight