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Re: where can i get service manual for my Technics sc...
I believe that these units use amp-pacs which look like large black ICs with multiple pins. If you can post the model number of the main unit, I should be able to get you the part number and cost. The model you list is the system model and I don't have a cross reference for those.
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Unless there's an issue with internal components of the amplifier or speakers, a common cause of this is reversed speaker polarity.
The wires between the + and - terminals of the speakers MUST connect to the same + and - terminals on the back of the stereo amplifier. The speaker wires that came with the stereo are color coded to help prevent mis-wiring. If you did not pay attention to this or used different wires for any reason, you need to ensure that the wires between the each of the speaker's 4 terminals connect to the correct group and + / - terminals on the amp.
Disconect the speaker(s) from the system. With a 1.5 volt battery touch the negative wire to the - of the battery. And for a short time only, the plus wire to the + of the battery. You should hear a pop! You might need to put your ear to the tweeter to hear it working. if it doesn't make any sound it's not working. Before chasing around for a new tweeter, open the speaker up and apply the test to the tweeter itself. If it now works the crossover part is faulty.
Tweeters are often the first to go when people run the amp at high volumes, so both could have gone!
Looking at the specs for your system, the amplifier only puts out 23x2 watts. That means each speaker right now will get 23 watts (approx.). This amplifier is built to drive the load (the speakers) that is hooked up to it now. If you were to hook up another set of speakers, they would have to be pretty small (similar to what came with the system) with a higher impedance (over 8 would be good). The issue is the increased load/strain on the amplifier with the new speakers. However, if you are using relatively small speakers, with short run of speaker wire you should be allright (most amps have a temp protection built in, if the amp gets too hot it will shut off). To hook up additional speakers use the terminal that are there. You will 2 right speakers and 2 left. Place both positive ends of the right speakers in the positive terminal on the back of the amp (twist the ends together, if you must) and both negatives in the negative terminal, for the right speaker, on the back of the amplifier. Do the same for both left speakers.
In summary, you can probably hook another set up small speakers (which are only a short distance away from the amp) without much problem assuming you wont be pushing the amplifier to its limits all the time. You may find the amplifier lack punch or looses some sound quality though as the amp is not designed to be driving and controlling that many speakers.
Hope this helps
DIsconnect sound Amplifier ic (RSN).After removal of the ic if the unit works o.k offcourse without sound than replace ic.If still f61 than sound ic is o.k and check voltege regulators in power supply.You can check dc detect line if it gets activated.
F61 is mainly two resons 1st sound ic or power supply problem in power bord which send signal to system control to shut down the power in order not to damege more.
measure with your vom meter at spker terminal dc voltge.You have to be fast .If you get any dc voltage at out put change amplifier ic.The voltage may appeare very little before unit goes off therefore you have to be fast ih measuring