[amsat-bb] Re: help with yaesu 736 (audio)

[Art McBride]

Alan,
 First you might check the headphone jack, it disconnects the speaker when
the phones are plugged in and the contacts may be dirty. Also try an
external speaker as the one inside may have lost part of its cone.

Most likely with 3+ decades of age, I suggest you replace all of the
aluminum Electrolytic capacitors, as they most likely have dried out over
the years. They are rated for a decade of service and three is pushing it.
As they are all of the same age replacing only the open one will begin to
happen at an increasing rate, so best to do them all it once. 
  
Art, KC6UQH

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Alan Sieg WB5RMG
Sent: Saturday, February 14, 2009 1:05 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: help with yaesu 736 (audio)

Nick said :
> My 736 in its 3 rd decade has low audio on all modes.
> I have to turn the af gain to about 3 o'clock position.

I've not had that trouble w/736, but I do have the "Technical Supplement"
for the FT-736R, which has block diagrams and schematics.
The audio makes it way thru several boards and connectors on it's way
around to the speaker. I can easily scan a few relevant pages and either
email or post on my web site if you are so inclined to dig into it.

Might check the level at the front headphone jack (and exercise the switch
contacts inside the jack) as well as the external speaker jack on the back.
I've had output interruptus due to cracked solder joints on the external
spkr jack before. Aged output blocking capacitors often result in lower
sound levels as time goes by. I've fixed many a VHF scanner that way.

Reply direct email via amsat.org, and we can take this out-of-band...
I didn't see your callsign handy, to reply direct.
   /;^)
-- 
  <- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
  <- http://www.somenet.net * http://wb5rmg.somenet.net ->
  <- http://www.linkedin.com/in/alansieg * My 'Day Job' ->

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