Hello, I have a Technics HD81 system, and after moving reconnected the 2 loudspeakers. One with it's original cable, the other one I got an 5m extention. Both loudspeakers do work, but after a while (30 min to 1h) they make a loud noise, no more music, and in the display shows F61. I don't dare to play the system again till the error is fixed. What stand the F61 for?? I appreciate and thank you for any idications!! Regards, Catarina

Probably, if connected correctly, there is a broken belt.

I would start by going on line and replacing all the tiny "O" ring drive belts, very cheap to buy.

Hi Alan
go here and grab a manual

http://www.usersmanualguide.com/

Hi. The user manual is here:

http://tda.panasonic-europe-service.com/docs/2z579139c5z3z1dd12z656ez706466z29z86d128710054b15cfab8c0aaa2a8439f8aa178d1/ttips/Audio/HiFi_Systems/SC/HD51/722130/Bhd51.pdf

The motor is shot,Or the gears are jamming up in it, Just look for a different one, It will cost you more to have it repaired, I have got good used disc (Players) For $10 to $40 at the most for friends of mine,

http://technicscatalogus.com/Manuals/Stereo%20Sets/Technics%20ST-HD81.pdf

In the optoma hd-81 there is a lamp unit housing.It goes faulty the lamp unit housing .There is no ballast in the hd-81 projector.There is lens ,the lamp unit housing and the circuit board.In most of the cases the lamp unit housing goes faulty.In that case the lamp housing needs to be replaced.It can be replaced and replacement lamp is also available. -------------------- Buying original lamp is always advisable.But there is compatible lamp also available.The original lamp housing is costly and compatible housing is bit cheaper.In some rare cases the compatible lamp does not work.But the compatible lamps also are good. To buy original lamp.Click this link directly:--- http://www.partstore.com/Part/Optoma+Technology+Inc/Optoma/HD81/Optoma+Technology+Inc/Optoma/BLFS300B/New.aspx ------------ this is link for compatible cheaper lamp.Click this link:-- http://www.partstore.com/Part/Optoma+Technology+Inc/Optoma/HD81/DNGO/DNGO/BLFS300BRL/New.aspx --------------- The procedure to replace the lamp:--- to get this procedure.Please click on the link below:--- http://www.partstore.com/Part/Optoma+Technology+Inc/Optoma/HD81/DNGO/DNGO/BLFS300BRL/New.aspx ------------ this link is for the user manual of optoma hd-81 and the procedure to replace lamp is mentioned on page number 59.Please read the instructions before replacing lamp.----------- This will help.Thanks.Helpmech.

overload is protection from very big signal input-or high current output.
1-keep your input signal between -10db-----to 0db.
2-confirm that amplifier power is greater than total power of loudspeakers by 20%(if loudspeaker total power is 8 watt-amp watt must be 10 watt at least.

1-keep good ventillation around and do not block any ventillation holes with any thing.
2-check your connection cable in good condition no touching of inner conductor with any chasis.
3-check your loudspeakers and apply them to the system one by one until you find the bad one(which make the problem if it is bad)