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KENWOOD UD-70 MIDI SYSTEM: When system is switched on a loud bang sounds through speakers & 'PROTECT ' starts FLASHING on AMPLIFIER DISPLAY. although everythings stopped working,cd player,cassette deck & tuner still seem to be functioning .Checked the speaker cable connection and all other cable connections as per manual,re-connected everything but still not solved the problem. Any solutions would be very much appreciated.

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: Protect

I know I'm finding lots of old posts about this JVC model MX-KB30 "PROTECT" problem but - I FIXED IT!!!! 8-) Daugter had the same difficulty after a series of power outages. Figured it had something to do with the speaker circuit board. Decided to look for a reset on the board itself. Not sure that I found one, basically becuase there was not a perception of a button pressing down, but the "PROTECT" cleared and the sound is coming through the speakers again. The sterio works fine. First - as when working on all electronics - unplug the unit and make sure all static electricity has been discharged before working on it. You will need a small jewlers philips screw driver as well as a mirror for looking down on top of the electrical components. Remove the cover of the sterio surrounding the sides and top of the unit - there are screws on the sides, top and around the edges of the back fo the unit related to this piece. You do not have to remove any other pieces. There will be a circuit board attached to the back center of the unit that has a black cable running to the headphone plug and the speaker connections are also running through this board. If you face the front of the unit, looking at the sound circuit board from the right side, there will be a small black - square looking - voltage regulator (I think that's what it is anyway) that you will see some voltage information and some switch setting pictographs (along with the numbers 1, 2, 3). On top of this black unit (here is where you need the mirror) there is a square hole that looks down inside this unit as well as a round hole that you will see white plastic inside. Using the jewlers screwdriver, carefully press on the white plastic once or twice (I couldn't tell that it had pushed down) particularly becuase I have no clue how sturdy this piece is. With the cover still off the unit, plug it in and make sure the "PROTECT" message has disappeared and the speakers are working again. That's exactly what I did and the darn thing started working again. Maybe I just got lucky, but this is a nice sounding unit and it would be a shame to see folks toss it away for such a simple fix if that is indeed what did it. Enjoy!

Posted on Apr 23, 2007

  • 1 Answer

SOURCE: bang & olufsen stereo unit 9300

Following advice from Simon at Avaservices.co.uk, I double checked the speaker switches and found that whilst handling the speakers I had moved one switch to line.

This I corrected and then double checked the cable concealment to one speaker and found that possibly one of the carpet strip tacks may have moved the cable position whilst refitting the carpet and caught the cable?

This was repositioned and the system tested. Absolutely terrific!

Thanks all round!

Posted on Feb 19, 2008

  • 146 Answers

SOURCE: We can't get the power to come on.

Make sure that everything is plug into the right spot. If the amp comes on and nothing else, I will check the power cords. Also check the power buttons for each unit and make sure they are on. Also listen for a click sound from the amp when you turn it on. You will here it about 2 to 7 seconds after you turn it on with the main power button. If you do not here it, then you have a problem with the amp. One of the channels is bad and you will need to take to a repair shop for repair.

Posted on Nov 17, 2008

  • 263 Answers

SOURCE: no connecting wires..????

They seem to have special leads to connect them together pretty expensive ....
http://cgi.ebay.co.uk/KENWOOD-B-B5-Connector-Hi-Fi-component-cables-lead_W0QQitemZ120453267078QQcmdZViewItemQQptZUK_AudioTVElectronics_HomeAudioHiFi_Tuners?hash=item1c0b92fe86&_trksid=p3286.c0.m14

Posted on Aug 03, 2009

  • 1 Answer

SOURCE: My Kenwood UD-500 Shelf System doesn't switch sources,

did u ever solve this problem? I have exactly the same problem?!

Posted on Oct 07, 2009

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