[time-nuts] HP 5370A temp

paul swed paulswedb at gmail.com
Mon Feb 7 16:41:25 UTC 2011


Yup various components have been run hot.
Like others in this group add a fan to the heat sink. Found a way to route a
wire out from the raw 5 volt supply to run a 12 volt fan. Think I took one
bolt out of the heat sink to route the wire. Think I added a resistor as I
did not need a lot of air to calm the heat sink down.

Definitely consider changing really stressed components they can be a bit
brown and still be OK. Measure them.
Good luck
Regards
Paul
WB8TSL


On Mon, Feb 7, 2011 at 11:28 AM, gonzo . <cadbloke at hotmail.com> wrote:

>
> Hi all,
> I just picked up an irresistibly cheap 5370A (so cheap I didn't ask if it
> worked).
> So far it checks out ok, but I have some questions for those of you more
> familiar with this model.
>
> 1) The back panel heatsink (4x TO3) is sitting on 76°C  (168°F).
> - is this normal?
>
> 2) Several resistors and diodes on the A6 Power Supply Controller show sign
> of excessive heat (specifically: CR1, R1 & R23).
> All the A6 voltage rails are within 0.2V.
> - Is this a normal sign of age or should I be looking for something that's
> NQR?
>
> Judging by the stickers, it's probably spent it's entire life with the side
> panels on the wrong sides.This may help explain the overheated components.
>
> cheers,
> ian
>
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