Hi,
last weekend I pulled an Onkyo TX-7830 receiver (radio and amplifier in one package) by dumpster diving. My findings on it so far are the FM/RF part obviously is working, as the signal indicator shows what has to be expected at my location when I'm tuning. But there's no signal at the loudspeaker terminals, regardless the inputs. The device allows to connect two pairs of speakers, labelled FRONT and REMOTE next to the terminals at the backside. At the faceplate there's a pair of buttons to activate the speakers, labelled MAIN and REMOTE there. When I push the MAIN button, I hear the clicking of a relay and the VFD tube display shows MAIN going on and off. But nothing happens on the pushing of REMOTE. Of course I got my speakers connected to FRONT.
On searching the WWW there was a hit at Elektrotanya. I downloaded the SM as it was labelled TX-7830, TX-906, TX-904 by ET, but found that it exclusively relates to the latter two. Anyway, it is a rather complex design, mostly consisting of proprietary LSI's and µP's. The signal processing is exclusively done by IC's.
Now there are some questions: Is the TX-7830 the same as a TX-906 or 904? If so, as which of both? Does anyone have experience with the same or a similar issue with these receivers? Where should I start trobleshooting? Or do I need to bring the unit back to the dumpster (after having harvested the mains xformer and other valuable components, of course)?
Best regards!
last weekend I pulled an Onkyo TX-7830 receiver (radio and amplifier in one package) by dumpster diving. My findings on it so far are the FM/RF part obviously is working, as the signal indicator shows what has to be expected at my location when I'm tuning. But there's no signal at the loudspeaker terminals, regardless the inputs. The device allows to connect two pairs of speakers, labelled FRONT and REMOTE next to the terminals at the backside. At the faceplate there's a pair of buttons to activate the speakers, labelled MAIN and REMOTE there. When I push the MAIN button, I hear the clicking of a relay and the VFD tube display shows MAIN going on and off. But nothing happens on the pushing of REMOTE. Of course I got my speakers connected to FRONT.
On searching the WWW there was a hit at Elektrotanya. I downloaded the SM as it was labelled TX-7830, TX-906, TX-904 by ET, but found that it exclusively relates to the latter two. Anyway, it is a rather complex design, mostly consisting of proprietary LSI's and µP's. The signal processing is exclusively done by IC's.
Now there are some questions: Is the TX-7830 the same as a TX-906 or 904? If so, as which of both? Does anyone have experience with the same or a similar issue with these receivers? Where should I start trobleshooting? Or do I need to bring the unit back to the dumpster (after having harvested the mains xformer and other valuable components, of course)?
Best regards!
Surprise, surprise! Yesterday and today I had the unit on my workbench again. All of a sudden, after poking with my meter probes in it without any suspicious finding, the main amplifier section started to work again. I absolutely don't know what has happened here. Only the remote speaker part, consisting of a pair of small SI-18751 chip amps, still is quiet, but I'll let it alone.
Now I'm thinking of looking for a 2nd unit, or a TX-7840/TX-906, rearrange both pairs of power amplifiers for BTL and use each amp to feed one speaker. We'll see...
Best regards!
Now I'm thinking of looking for a 2nd unit, or a TX-7840/TX-906, rearrange both pairs of power amplifiers for BTL and use each amp to feed one speaker. We'll see...
Best regards!
just a question .
why go after this thing that has little interest if not for a garage?
if you want a receiver worthy of the name to tinker with, I'll give you one if you want it.
why go after this thing that has little interest if not for a garage?
if you want a receiver worthy of the name to tinker with, I'll give you one if you want it.
Of course you're right. Anyway, in my understanding DIY also can mean to prevent gear from being thrown at the dumpsters - and to learn something while repairing/maintaining it.
Which unit do you suggest? Where are you located?
Best regards!
Which unit do you suggest? Where are you located?
Best regards!