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<david.partridge@...> wrote: I assume that the self test/memory backup switch function relies on the newer firmware. I think the hard part would be copying the new firmware to the old memory

One of my standard troubleshooting techniques is to use a small screwdriver to lift all socketed ICs (not so much as to remove a pin, just to wipe the contact) and reseat them. Just a small twist of

David, Do you have the schematics of this later memory board? I think it would be a great modification to change the earlier board to do this too. Regards, David Partridge

I believe the behavior you are seeing is normal. I have the most recent 7854 hardware version which has a lithium backup battery mounted on the memory board. On the back of the mainframe where the

Hi David, In my pdf section 6 the missing pages are 6-16, 17, 18, 19, 22 (done), 23 (done), 26,27, 34, 35. There might be a more complete pdf, so perhaps wait or Herbert. Albert

Yes, it is normal.

On 12/19/2012 05:39 PM, David wrote: > > On Wed, 19 Dec 2012 17:00:50 -0500, Bert Haskins > <bhaskins@... <mailto:bhaskins%40chartermi.net>> wrote: > > >On 12/19/2012 02:34 PM, David wrote:

Ok... No biggie, if someone wants to let me know, I can scan those as well. I don't particularly want to scan the whole thing, it isn't tiny..... David

Hi Bogdan, I did not trz up to now, but I think, it will goon with working with all the parameters from before and with the waveforms retained ! Herbert Am 21-01-2013 15:20, schrieb bogroca:

Hi Herbert, I assumed that myself. The question that bothers me, is that about what is the NORMAL behaviour when power-up with the battery back-up connected? The manuals, both the op and service, say

Hi , thanks to all especialy to David !!! I have included the two pages and put the file to http://www.ko4bb.com/manuals/index.php?dir=10%29_Recent_Uploads where we all like to download !!! Herbert Am

Be prepared for more requests David, several other pages are missing as well ;=). Albert

I'll email it directly in two seconds, since attachments tend to be dropped from the mailing list. I just scanned the two pages into one tif file. Chopping it up is left as an exercise for the reader.

Hi David, that exactly what I am searching !!! Herbert Am 21-01-2013 14:00, schrieb David Holland:

6-21 contains the section "Observing the waveform memories at power-up" ? If so, I've a dead tree copy I can scan.....

Hi all out there, in all the manual copies of the "Using the Waveform Calculator - 7854" available on the web the pages 6-22 and 6-23 are missing. Does somebody have a paper version and can scan those

Hi Bogdan, it is normal for the HM62256B to keep the data down to approx. 1V. I think what zou see is, that the system does not recognnize the power off phase . Herbert

Hi all, After replacing the ROMs (document to come soon), I got on to the RAM. Replaced all 91L24 chips with 2x HM62256B (that's all I had at hand), thinking to first try out the simple SRAM and then,

<daviddigiacomo@...> wrote: Tektronix's choice of the 2N918 to replace the 2N3605 was bothering me so I did some research and then some tests on my 185. I had to dig out my National discrete

I think those general purpose parts are a bit too slow to be good substitutions. I would try something faster like PN918, PN2369A, PN4275, 2N5770, MPSH17, etc. Everyone should have at least one of