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    kenwood

    it sounds like you might have a dirty laser lens. over time these attract dust as they run warm. you could try a lens cleaning disc or if you are a little more adventerous you could try the cotton...
  2. amplifier

    are you sure you have fitted the correct current fuses internally? if you have used higher amperage fuses than before then the external fuse would fail first i would suspect. the problem sounds like...
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    i would look for possible dry joints on the pcb....

    i would look for possible dry joints on the pcb. the fault sounds like a noisy driver transistor or pre-driver to that channel, the only way to find out is to swap the transistors over one by one...
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    im glad its working again lol. you might have...

    im glad its working again lol. you might have just disturbed something when you took it all apart, the fault might recur but it sounds like it was a bad connection on a plug/socket on one of the...
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    Sticky: just thought i would introduce myself. i'm peter...

    just thought i would introduce myself. i'm peter 41 living in the u.k. by trade i'm a tv technician but have since gone into engineering. my hobbies include lathe work and repairing old valve...
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    humour for tv and radio technicians

    i thought i would start a new thread to see if there are any tv, radio or audio repairers amongst us. i would like to hear any funny stories you might want to share or any annoying things that tend...
  7. really put my foot in it!

    on the subject of home repair disasters, ive a real corker here for you. about 5 yrs ago i decided to go into the loft to try to discover where a leak was coming from as rainwater was getting in down...
  8. this model is well known to develop problems in...

    this model is well known to develop problems in the vertical output ic. change all the associated electrolytic capacitors around this chip and the ic will also need to be changed, whilst you are...
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    i think it would be pudent also to check the...

    i think it would be pudent also to check the quiescent current setting if it has one too, as if this is incorrectly set it will cause cross-over distortion at low volumes.

    peter
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    if you are sure it was a non-standard power...

    if you are sure it was a non-standard power supply your friend used it could have been the wrong polarity assuming its a d.c. adaptor. depending on how high the voltage was, the regulator if it has...
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    lol i second that!! dont be tempted to use wd40!...

    lol i second that!! dont be tempted to use wd40! it has been known to literally rot plastic pots and switches. it sounds to me like the unit needs a good overhaul. clean switches, check for dry...
  12. i'm not at all familier with this model. its...

    i'm not at all familier with this model. its definatly a p.s.u problem. when you say you have changed the fuse, was it the internal one in the unit or in the plug? assuming you have then the fault...
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    amplifiers can be weird things lol. it sounds...

    amplifiers can be weird things lol. it sounds like your output stage is ok. maybe the speaker switches need a clean or possibly they may have a dry joint on them assuming they are connected directly...
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    hmmmm. certainly sounds a weird one that. i would...

    hmmmm. certainly sounds a weird one that. i would suggest the power amp is ok if it works for a while unless its going into some sort of thermal runaway. its not unknown for transistors or indeed...
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    the fuse that was inside origionally was probably...

    the fuse that was inside origionally was probably the correct value, the fact its gone black means there is a heavy current flowing due to a short circuit. the bridge rectifier or smoothing...
  16. yes you are right, these models suffer badly with...

    yes you are right, these models suffer badly with the surface mounted electrolytics leaking. the problem here is that the electrolyte tends to eat away through the tiny copper tracks on the pcb and...
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    yeps! i agree with burstboy, lightning can be...

    yeps! i agree with burstboy, lightning can be lethal to electronics, what can happen sometimes is the electricity substation can be struck and send the significant rise in electricity to all your...
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    it does sound like an internal fault, i agree....

    it does sound like an internal fault, i agree. obviously the centre speaker is working fine? have you tried it on another channel just to make sure? if all is good with speaker then the fault could...
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    fisher amp

    hi. it sounds very much like a loose connection to me. are your speakers sited near the amp or well away from it? if they are well away then it makes sense that the noise doesnt come on at high...
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