Hi, I've just bought a used Technics HD81 system and i'm running my tv through it, it worked perfect for around 30 mins and then just threw a wobbley. the system changed to CD on its own and then kept skipping through the cd's, flicking random selection on and off, same with repeat and randomly played songs without me touching anything, the system was then jammed on the CD selection (it wouldn't change to radio aux or tape) but i couldn't open the CD tray, no matter what button i hit it just kept switching the random play on and off- even if i push a buton on the tape deck. Have you any idea whats wrong with it please.
Regards Brian
SOURCE: Random play
Hi - You can download the manual by clicking the link underlined in blue below:
SL-MC70
See page 17:
Note this feature requires the remote control!
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Informatica
SOURCE: Technics Sl-DZ1200s skipping on one deck
Change the motor disc spindle they are all the problem
SOURCE: Hello, I have a Technics
Hi! Used to work on one and the only fix is that I unplugged all the power and sub receiver. Just turned the unit on and off and reconnect everything and it was fine. It's like the system needs to be resetted somehow. Hope this shed some light.
SOURCE: Technics amp hd81 shows fault
IS it the amp fan failing? It could be something simpler and cheap.
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it '*****'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
WE don't fix things, nor do we provide parts. We provide advice and answers and usually simple direction for where to look for answers, which are usually available somewhere on the Internet.
You can find the Service Manual (not necessarily for free) by web searching "Technics HD81 Service Manual". It will identify the fan part number. Then web search for THAT.
Only YOU know where you are so we can't point you to a repair tech. labor charges will vary. Once again, web search.
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Brian
I too have the same hi fi system. I've had it from new, for about 12
years now, and just a couple of months ago it started exhibiting the
same symptoms as you describe - buttons won't work as normal, cds change
randomly etc.
My solution was to disconnect the CD player, which will show 'U70 CD' on
the display, but everything else (radio, tape) will work as normal.
Hopefully someone can suggest something useful to get the system back to
its former glory.
Will
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