20 Most Recent Technics SA-DA10 Receiver Questions & Answers

Ahh technics. Technics always had overheating problems, trust me. Every since they started, their amps would get so hot they would hurt to touch. The reason the fan is not coming on seams to be something inside the circuit board. I'm sure that technics could fix this. If the fan works out of the receiver, then it must not be the fan. ;P

I would maybe get a computer fan, and just put it on top of the receiver and turn it on, or send it in for fixing. Also, do you have to crank the volume to get the speakers to play at your volume, and does the impeadence match the receiver. Because you may be pushing the receiver too hard.

You can download copy of the user manual for this unit from this link, just click HERE and proceed with the download.

Generally speaking, an amp protects 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 'naked'. 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.

If with another position of the volume buttom the sound is normal, maybe the problem can be dust or something jammed between volume buttom and its knob. Try to carefully pull out the volume buttom from the unit and then clean its internal part with some neutral lubricant as well as the knob where it it is fixed.

The audio amplifier IC´s are in short circuit need to be replaced

Receiver say's "Protect" or turns on then off posted on Dec 13, 2009
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The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

I have a Technics SA DA20 control receiver. I was given it by an electronics workshop and it has this same error of OVERLOAD coming into the display when switched on. I removed the plates from underneath and re-soldered as far as I could all the points along the stereo amplifier ICs and as far as access would allow. The unit then worked normally for several hours. I was very pleased, and went out shopping!. But on my return after it had been off for about an hour, the same problem has come back. But my boss at the electornics workshop thinks it it just a dry joint, or series of dry joints. The unit is complex to dismantle, so patience and care is required in taking it apart and making a note or diagram of how it comes to pieces and how to re-assemble it after the board has been re-soldered. It does not appear to be a component problem or fault with the SVI power amplifier ICs.
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Cracked solder joints due to excessive heat cycling. Do not place in a shelf system. Top MUST be open for 1 ft. or better for proper convective cooling effect. Mine suffered same fate but repaired locally.

You need to take apart the unit to test it , startig from the volume controls.

Have you tried connecting speakers? What was the result?

Yes, when you turn the volume up on these amps (or when the output gets past a certain level) the cooling fan should automatically come on.

You'll want to use the AUX, because it, for sure, does not have any RIAA equalization, which the phono input may or may not have.

Short answer: Plug the mp3 player into the AUX inputs.

There may be more reasonable prices around but you will need to post the type number of the module.
Unless it is a proprietary part number, it should have 2-3 letters, then several numbers following and perhaps another letter.

These units seem to have more problems than others in their class and they may have inadequate output protection.

I don't have the specs available for your SA-DA10 so the distribution of power over frequency is unknown to me but the receiver is capable of ~500 watts with most of it likely concentrated in the lower frequencies which do require more power to produce.

However, if your speakers are all of the typical wire-wound voice coil construction, the tweeters and midrange speakers use a much finer gauge of wire that has less power handling capability than the heavier stuff used in woofers.
That is lighter wire is necessary to keep the moving mass of the speakers low otherwise they would not be able to move quickly enough to reproduce the higher frequencies.

Additionally, it is possible (I have seen it) that your amplifier section is producing output frequencies caused by internal oscillations (a defect) that were not part of the sound they were trying to reproduce. These unwanted sounds can be well above the range of hearing so would only serve to destroy the speakers.

This problem could only be caught by an oscilloscope, not seen by the average analog or digital meter.

There is also a chance that you have DC offset voltage on the guilty channel; something that could be seen with an inexpensive multimeter; if you don't own one, there are incredibly cheap but adequate Chinese meters (digital type) that can be had for a few dollars in the US (as little as $3 US) and are probably available in Denmark too.
I suggest you should have one at home for many simple tests as they require very little technical knowledge to use.

I would have all speakers connected but NO SOUND being produced.
Measure ACROSS each of the speakers' output terminals (at the receiver or the speakers) and look for any larger DC differences between the several channels.
There should be very low levels of DC voltage (less than a volt) at those points regardless of how long the receiver has been on.

There seem to be many reports of failed output modules (discussed elsewhere at Fixya) and this could easily cause especially the high frequency speakers to fail from static (no sound) current flowing through them.

The Tivoli has apparently grown since I last saw it (~ 1963-4). When I knew it, it had several dance halls, many places to eat and a great number of very friendly English-speaking young women, the latter was much appreciated by myself and other Americans of my age.
I am afraid my traveling days are gone so enjoy it for me when you next go there!

Steve

Are you paying attention to the power rating of your speakers? Your receiver has a high power capability and would be quite capable of destroying speakers with inadequate power handling capabilities.

By the way, the Tivoli was a great place to be in 1963 for a young guy!
Hope it still is . . .

If all the speakers are connected proper and it still says "Overload!!!!!"

Your output amplifier module is most likely failed.

Most of these problems are rooted in a failed power amp module.
I'm working on an older technics unit but with the same troubles.

Sure it is possible :), there you go
http://www.usersmanualguide.com/panasonic/av_control_receiver/sa-da10

Have a nice day!

Alex

If you feel confident doing so, you could attempt to open the cassette deck and physically examine the gears to check for damage or debris that might be obstructing them. But do remember that there are risks involved when opening electronic equipment, especially if you're not used with doing this kind of work. If you're not sure you can do this securely, it would be preferable to get assistance from a qualified audio equipment repair specialist.