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HP 8640B - OPT 323 Service Manual

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SuperMario:
Hi,
I am looking for the service manual for HP 8640B - OPT 323. This is a military version of HP8640B. The problem is in the frequency counter circuit, it displays 60% of set value. RF output is at correct frequency. I have manual for the 8640B but counter part is different. If anyone can help with this issue please let me know.
Thanks.

sbrom:

--- Quote from: SuperMario on November 16, 2022, 03:04:27 am ---Hi,
I am looking for the service manual for HP 8640B - OPT 323. This is a military version of HP8640B. The problem is in the frequency counter circuit, it displays 60% of set value. RF output is at correct frequency. I have manual for the 8640B but counter part is different. If anyone can help with this issue please let me know.
Thanks.

--- End quote ---

Don’t know if this is real, but here’s a manual listed for sale, $65.  I’ve not seen a free pdf with the option 323.

https://fairradio.com/?s=Usm-323

alm:
It might be worth emailing Dave at Artek Manuals to see if any of the 7 different scans he sells cover option 323. Not free, but not $65 either. The 8640B-AN/USM-323 manual sounds like it might be the right one.

joeqsmith:
https://antiqueradios.com/forums/viewtopic.php?f=8&t=252760

SuperMario:
Ordered one from ArtekManuals for $12.50. Still waiting for download link.
Thanks for the suggestion.

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