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. /;^)
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@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Alan Sieg WB5RMG Sent: Saturday, February 14, 2009 1:05 PM To: amsat-bb@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. /;^)
participants (2)
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Alan Sieg WB5RMG -
Art McBride