Question about JVC Audio Players & Recorders
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Posted on Jan 02, 2017
SOURCE: JVC TH-M303
Well this is and isn't a fix. I don't know what the underlaying problem is that causes the Amp to shut down but I have come up with a way to stop it from doing so. What ever the problem is it is triggering a circut on the board called "Protect" which can be circumvented. You need to start by pulling out the amplifier unit from the subwoofer assembly. You will see that there are two circut boards at 90 degrees to each other that are connected by 3 sets of connectors. You need to remove the screws and wire that hold in the board attached to the bottom of the assembly. You can then pull it out disconnecting the connectors. The connector closest to the power trasformer is the one that we are concerned with. On the vertically oriented circut board you will find a small map of the connector identifying pin #5 as "Protect". Inside the portion of the connector attached to the bottom board that you pulled out, use a small set of needle nose pliers to break off pin #5. Then reassemble the amp and put the subwoofer back together. I used this solution and it has been working since. If you have reservations about breaking the pin out then try just bending it out of the way and partially reassembling the unit and powering it up. Once you see that it does indeed solve the problem you can break it out. Like I said, I don't know why it started to turn off spontaniously in the first place but this does fix the problem.
Posted on Sep 25, 2007
got there choose the right manuel for you i think you can download it you might need this software to read it www.adobe.com get adobe acrobat reader
Posted on Jan 18, 2008
First, make sure it didn't get muted, or the remote's volume got turned way down. Next, it might be time to involve a technician who can check all the power supply voltages. Many of today's electronics have multiple voltage power supplys, 5 volts for logic, 12 volts for motors, and amplifiers usually have the biggest- maybe plus and minus 30 volts for a total of 60. There are hazardous voltages in there too, a switching power supply starts with over 300 volts. So don't lick it and see if your tongue tingles, that's only for 9 volt batteries.
Posted on Jan 29, 2008
this might be happening because the audio format for surround is not supported by the channel or affiliate of the channel that you are viewing does this happen on all tv channels or is it on just a few? if all sound while playing a dvd is proper and in working order than there must be an issue with the sound and or format of sound from the tv source. maybe more information would help me decipher this
anyways hope it helps
Posted on Feb 18, 2009
SOURCE: JVC sp-pwm606
Hello, it,s very possible that it,s circuit protector built in to the sub (if it,s a self powered sub) gets to the point of overload and shuts off as a protection so that the speaker won,t get damaged and also so the internal amp tha,t pushing the speaker sound is also protected since theese amps all have heat buildup, their are two types of subwoofers ,They are the powered ones and the ones that are powered bt the surround amp ,The ones powered by the stereo surround amp/tuner tend to throw out less power to the sub and the ones that have internal power are mostly higher powered , Another thing you might want to check is your polarity to the speakers and also the omage , Most home theater system speakers are 8 ohm,s but their are speakers and amps that can be changed to 6 ohm,s ..so you might want to check the speaker rating also . Well hopefully you can use theese different methods to at least troubleshoot and discount the thing,s that are not the issues , Good luck and hope theese sugestions might help you , Sincerely Glenn
Posted on Mar 04, 2009
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