[R-390] re; R211

[Joe Foley]

You should be able to hear the thermostat on HR202 cycling on and off during operation, it might be loud enough to be annoying.

It should make a clink or ping near the right-rear corner.

I'm  not saying they are all audible but most probably are.

Joe



--- On Sat, 11/7/09, Craig C. Heaton <wd8kdg at worldnet.att.net> wrote:

> From: Craig C. Heaton <wd8kdg at worldnet.att.net>
> Subject: Re: [R-390] re; R211
> To: "'wli'" <wli98122 at yahoo.com>, R-390 at mailman.qth.net
> Date: Saturday, November 7, 2009, 7:15 PM
> W. Li,
> 
> Don't think the signs of overheating are cause by high VAC
> to the heating
> element, other circuits would also be screaming. Have you
> put a thermocouple
> between the hold down strap and HR202. Could be a stuck
> thermostat, I
> believe looking at the drawing there is one built into
> HR202.
> 
> R211, innocent error. Does anyone have one belly up at this
> time to check
> the value on another RF deck? In my Amelco R235 was
> incorrect, must of
> worked at one time, the QA/QC stickers are still on the
> top/bottom cover &
> frame. The crystal calibration was not working when I got
> the Amelco and a
> correct R235 didn't help, had to replace all the silver
> mica's. Great
> practice getting the RF deck belly side up.
> 
> Craig, 
> 
> 
> 
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]
> On Behalf Of wli
> Sent: Saturday, November 07, 2009 3:51 PM
> To: R-390 at mailman.qth.net
> Subject: [R-390] re; R211
> 
> I am in the process of going through the RF deck on my 1952
> Collins R390A.
> The first thing that struck me was the chassis darkening in
> the
> subcompartment under HR202. As we know the heater is *on*
> all the time,
> cooking the Xtals. All the small components there showed
> the effects of lots
> heat with runny wax on the micas and darkened ceramic disc
> bypasses.
> 
> One strange finding was R211. There was a 82K resistor, but
> all the manuals
> called for a 8.2K resistor. My question is: is this just an
> innocent error?
> 
> Thanks
> 
> W. Li
> 
> 
>       
> 
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