I have a similar stereo except mine's a YHT-400. Picture here
Whenever I turn the volume up past 25 or so out of 40, it'll turn itself up or down, sometimes it turns itself up faster than you can possibly imgagine, the numbers just roll up to MAX (40) and then it gets all distorted and starts blowing the speakers. It's really annoying because I can't blast music in a controlled way. I think it might have something to do with the amount of power to the Subs considering I have 2 hooked up and the heavy bass songs seem to be what set off the volume changes.
My Yahoo YHT-400 does something similar, only it won't do it right away, it has to start getting hot first, then if I have the volume set at 25 or higher, it will slowly start turning itself up louder until it either maxes out, or I intervene. Either way, it's really annoying, even though I'm only using it as an amplifier for my computer. I just figured it was doing it where it's second-hand and had tons of dust inside caked in and around the fans until I cleaned it out. But when on AUX/TV, one would think the Bit Rate Transfer gauge would remain at 00, but it jumps up and down constantly, whether there's any audio being put through it or not.
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Well knowing what stereo you have would help, but mine, the volume knob doubles as the settings knob if you press it. In some newer systems like mine, you should find a "back" button (small arrow) like on a cell phone. Trying using that to escape the settings mode that you might have activated.
Mine did the same thing, I just took the face plate off and replaced it a couple times, and magically a couple days later it starts working. It does this to me at least once a month, its very irritating. Apparently its a common problem for this model, and as of yet I haven't found any other way to fix it except just waiting for it to start working again. I've decided to scrap mine and buy another player.
I have a Yahoo YHT-400 as well, mine is second hand, but it too has a problem with reading discs, that's why buddy I got it from gave it to me for free, since I only wanted it for a 5.1ch receiver/amp for my computer, so far everything else on it seems to still work. As for purchasing another laser assembly/cradle, probably an individual can't do so, but an electronics repair technician might be able to. And the actual manufacturer is *I think* Diamond Electronics. But I'm not entirely sure why there's two laser pickups in the unit, could be something to do with one of the unit's features that it has. I've opened up a couple other DVD players, and they only had the one laser pickup.
Your amplifier located in the right rear trunk area wheel well has IC's transistors etc. that overheat from high volume as well age. I had mine repaired for about a 150.00 in Oklahoma city. Look on ebay for used might be best way to go..
The problem is that the unit is not immune to sweat as Motorola claims it is. Mine did the same thing with trying to lower the volume. You might try to dry it out good with a hair dryer (but don't get it too hot). That might help for a while, but eventually it will short out again and you won't be able to fix it. Sony just came out with a unit that is similar and I am going to dump the Motorola for the Sony to see if it works better.
there is a flat connects the top panel which has all the controls with the other circutes in the stereo...
so you have to open it and care for the cd unit it damage easily then check the flat for loseness or cuts
it happened to me also and that works perfectly