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Re: HP8663A Firmware difference

 

Hi Askild

The contents of the EPROMS will be different for the various production batches which are identified by the first four digits of the serial number. ?The simple way of checking them is by using a signature analyser such as the HP5005 series or Tek 308.

The full service manual gives the signatures for the various production batches, in case you do not know the first two digits give the year of the batch and the second two the week.

The standard fault with the 8663A is the power supply.

73 George G6HIG




On Thursday, October 11, 2018 2:27 PM, Askild <megafluffy@...> wrote:



Hi all,

Short question is, do anybody know the difference in the 16 x 2516/2716(2k x 8) vs the 1 x 27256 (32k x 8)? firmware for the HP 8663A?


Long version :)
I found a HP 8663A in a dumpster a while?back, it was missing top and bottom cover, as well as two of the pcb's in the psu. And it had been raining, so it was quite wet. Had also broken a few of the smc connectors on its travel to the dumpster.
I have now done a complete disassemble, cleaned all parts for corrosion, replaced the broken connectors and started to reassemble it. I also found that the OCXO was toasted, quite crispy... So I have ordered and received on off ebay.
I'm going to use lab power supplies to power it during testing to see if there is any hope for it, the linear regulator board was present in the psu, and it's OK, so I'm using that to regulate the 3 voltages that go trough it.
So far I have tested that the OCXO I bought on ebay is OK, and I have tested the generator with only front panel and the digital boards. It seems to be OK, it responds to input via buttons and rpg. It does freeze if I set frequency to something? above 600MHz, but I wont worry about that before I have tested with all the analog parts.
When doing this test, I did see that it draw about 6amps on the 5V supply, and after it had been running for a little while, I checked the temperatures on the different boards, and found that the EPROMs (TMS2516) was the hottest IC's. So I have ordered, but not received yet, a bunch of AT28C16, to try to get the power consumption down a bit.
I checked my readout of my eproms vs what i found on KO4BB, and it seems to be good. I also checked and found out that the 32kB file is very similar, so I split it in 16, and checked each part vs the 16 x 2kB files, and many is equal, and many just a few bytes is different, and some have a lot of difference. So if I get everything up and running, I might try to load my 16 split of the 32kB firmware and see how that goes.. But there might be someone here that knows what the difference between the two is?

Serial: 2405A00359

Br
Askild Eide

By the way, there is over 200? #4-40UNC? screws on each side of this instrument. I ordered new hex version, as mine was rusted and hard to get out.?
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