M8G wrote: > opened the unit yesterday. Measured the voltage coming from adapter > power to speaker and it was all fine. > > When I did the same from battery power to speaker, it was totally no > voltage at all. I assume its some blocking between connectors. > > PCB unit doesn't look to have any damage or sign of defect components. > > Must be hardware issue or do we have anything else in the loop? > > U where talking about switch, do u know where it can be located on the > PCB? can it be forced by any config file or manipulated by voltage > current? > I did inserted the adapter plug and run it on the battery too, to secure > the switch problem. > >
Ok, my guess that there might be a switch on the line power receptacle (my last post) looks like a "no". There are only two wires coming from your "power in" If there was a switch on the socket, there would be an additional wire. when you say you are measuring voltage, remember that it's AC, unless it has a DC bias, I don't know the design. I would measure with an o-scope, but not everyone has those laying around. I also don't know where the audio amplifier is, on that PCB, or back in by the speaker. I would guess that the amplifier is on that PCB because the connector to the speakers is only 4 pin. The four pin I would guess to be L/R +/-. I say this because the output of that connector would be either low level (preamp level) or speaker level. If you had an old speaker (if its high level) or set of headphones/earbuds (if it's low level), you could touch wires to 2 pins at a time and see if sound comes out. Look for a +/- marking on the pcb. Be careful not to short any two pins, use a needle/pin (or similar) as probes The "speaker" connector, does that lead to another PCB in the case adjacent to the speaker? I would guess it could be just could be just a passive crossover (woofer and tweeter) and maybe a mixer (combine L and R). But to your original point. If you have both line and the battery connected, the radio plays fine. If the line power is disconnected, the speaker does not play but the headphone does. Since both line and battery power come into that pcb, and the speaker signal comes out from it, it would indicate that it's on that board. I have a radio in storage that I could take apart (I'm curious too) but I don't know if I can get to it today. Did you think to contact Joe to see if he had any ideas? Jim ------------------------------------------------------------------------ Redrum's Profile: http://forums.slimdevices.com/member.php?userid=33806 View this thread: http://forums.slimdevices.com/showthread.php?t=115497 _______________________________________________ Radio mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/radio
