[1000mp] strange speaker problem

[Esa Korhonen]

Bill,

you said you have checked the jacks and the wiring for cold solder joints,
but have you also checked the headphone jack itself? It's got contacts that
open when you insert the plug, and cuts the audio from the speaker. When you
pull out the plug, the contacts close again letting the audio through to the
speaker. To me it sounds like here's the culprit: bad/dirty/bent contacts
not quite making a reliable contact.

GL/73!  Esa OH7WV


-----Original Message-----
From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
On Behalf Of FireBrick
Sent: 12. toukokuuta 2005 14:57
To: FT1000MP List; Kok Chen
Subject: [1000mp] strange speaker problem


Using a ft1000mp and have a Yaesu SP8 speaker.(that's the version with the
built in audio 
filtering which I never use)
I don't use the speaker that much preferring earphones on cw and ssb. but
occasionally use the speaker.

Here's the problem. When I pull the headphone plug out of the MP, there is
no sound coming 
out of the SP8.
Not EVERY time, but most of the time.
But if I turn the audio gain on the MP, it pops back to life, way too loud.
I can then turn the audio gain on the MP back down to a normal level. And
sometimes, the sound will quit if I bump the desk. Tapping the SP8 case will
'sometimes' bring it back. But turning the AF gain on the MP works EVERY
time.

Sort of like a circuit is tuned too close.
Changing the settings of the SP8 filtering does cause changes in the
filtering but does 
not effect the muted audio until gain reaches some threshold situation.

I've checked all jacks and wiring for cold solder joints.
The SP8 is connected to the SPK jack on the back of the MP of course and is
disconnected 
when using headphones.

So before I try and bypass the audio filter circuit, can anyone make a
suggestion.


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Mississippi State Motto: Come And Feel Better About Your Own State
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Bill H. in Chicagoland