Some of the 8640Bs had the multi-speed fan and some had single-speed standard square fans. HP changed the design somewhere along the way so there's a mix of both out there.
Thanks,
Barry - N4BUQ
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----- Original Message -----
From: "Szabolcs Szigeti" <szigiszabolcs@...>
To: [email protected]
Sent: Tuesday, October 13, 2020 1:42:35 AM
Subject: Re: [HP-Agilent-Keysight-equipment] HP8640B fan
Hi,
As far as I know, the 8640B has a 3 phase motor for the fan, and one of the
power supply boards contains the driver and speed regulator circuits for
it. Unless, of course in your unit it has already been replaced by
something else.
Szabolcs
Henry Newton <EequalsIR@...> ezt ¨ªrta (id?pont: 2020. okt. 12., H,
23:04):
Hello all,
I've just ordered the brass gears from the eBay fellow in India. Many
thanks to all who presented the gear information.
While waiting, I need to replace my noisy fan in my 8640B.
From the red & black leads going to a nearby board, it appears it is a 5V
fan. My fan has a black colored motor.
Any ideas on the CFM? Or a fan source?
Thanks
