[R-390] FW: Saturday's Line & Local Report

[Craig Heaton]

Charles,

You have my humble apologies, I don't mean to offend anyone. It should be
clear, I can't & haven't found any wiring issues so far. Could keep on
looking, but I'm going to purchase some caps and give it a go. Three caps
isn't going to break the bank, the shipping & handling will cost more than
the caps. Your help and knowledge is priceless to someone like me & others,
radio is not my ball of wax. 

Following a schematic with a VOM isn't a problem, just takes time (mine).
Ok, I did point out short comings with the positioning of the wiring harness
in the AF module. But with a VOM, there isn't a short, ground, or open that
I could find. Let's not spend any more time on the AF until new caps are
installed. 

We all have our favorite ways of doing things. I'll not fault you for yours,
please don't fault me for mine. 

Best Regards,
Craig  

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Charles Steinmetz
Sent: Sunday, January 05, 2014 7:06 PM
To: 390 list
Subject: Re: [R-390] Saturday's Line & Local Report

Craig wrote:

>All the negative leads of [C603] connect to pin one (1).  There is a 
>short wire directly from pin one (1) of the socket for C603 to the AF 
>chassis. Either from P120 or P119, the AF chassis is grounded to the 
>main chassis.

Well, it's supposed to be, but are you absolutely positive it really is,
electrically (not just "looks like")?  C603B not doing its job is
inconsistent with the Motorola AF deck not curing the problem when it is
installed in the Amelco radio.  C603 may not be doing its job, but if your
observation that swapping in the Motorola AF deck does not cure the problem
is correct (i.e., repeatable), then it is not because the capacitor or the
capacitor connections internal to the Amelco AF module are bad.  Which
leaves bad grounding (most likely, of the AF module or the front panel) as
the apparent culprit.

>Proceeding in an orderly, logical way is only one point of view.

OK, I'm done.  Proceeding in an orderly, logical way is how you avoid
wasting a lot of your (and our) time and effort.

Best regards,

Charles


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