[time-nuts] HP 5370A temp

Bob Camp lists at rtty.us
Mon Feb 7 22:15:00 UTC 2011


Hi

Gee, a low cost 5370.... 

The nice thing is that even though it runs hot - it's done it for a *long*
time. I certainly would not argue against a fan. They are a *very* good
idea.  However it's not going to turn to dust without one.

I would definitely keep it clean and keep the back side open to air. As you
have noted - make sure the vent holes are where they should be and
unblocked. Stacking 5 or 10 on top of each other likely isn't a good idea
either ....

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of gonzo .
Sent: Monday, February 07, 2011 11:28 AM
To: time-nuts
Subject: [time-nuts] HP 5370A temp


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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