Question about Technics SA-AX540 Receiver

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Technics SA-R477 This has been a wonderful receiver. I've had it for about 20 yrs. and just recently I went to turn the unit on and the power and volume were working fine and a few minutes after being on, the volume stopped.

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6 Suggested Answers

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SOURCE: technics SA-DX950

when turn on receiver , after few seconds got message
F70. when wants to do any operation with receiver got message SWITCH POWER OFF

Posted on Sep 24, 2008

  • 1 Answer

SOURCE: I have a Technics SA-AX610 receiver that says overload .

From the manual pg 27....... "The protection circuitry has functioned because the positive and negative speaker connection wires are "shorted," speaker systems with an impedance less than the indicated rated impedance of this unit are used or under severe use, such as loud volume, excessive power and in an excessively hot environment."

Posted on Jan 17, 2009

  • 4234 Answers

SOURCE: Technics SA-DX950 intermitently sounds blown out

There are poor solder connections at the output amp pacs and the voltage regulators. Once these are resoldered the problem should go away. If you can solder, resolder any connections that appear grainy or have rings. If you can not, this should be effectively a labor only repair for any shop that works on audio gear.

Dan

Posted on Feb 18, 2009

  • 1 Answer

SOURCE: Technics sa 400 Receiver

Checked fuses then sprayed contact cleaner on the fuses and the fuse holders. The speakers began to work correctly.

Posted on May 29, 2009

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SOURCE: Max. wattage for speakers w/ Technics Receiver SA-GX100?

I too have a Technics SA-GX100 and it's rated at 2 x 40W @ 8 Ohms. I have the Technics SB-2840 floor model speakers hooked to it, which are rated at 200W Music Input - 8 ohms. It sounds very nice just to be a 40W receiver.

Posted on Jun 12, 2009

  • 1 Answer

SOURCE: Technics SA-AX730 Receiver PLAYS FINE AT A VERY LOW VOLUME.

Have you checked to see if your fan is still working.....I am having the same issue but I think it's my fan b/c it was doing this when I first got it and for the 1st couple of years.

Posted on Jul 31, 2009

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it could be that your amp chips are gettin hot

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Overload at medium (4-6) volumes. Can you adjust or disable the overload protection on these Technics amps??


try this mate:
http://www.electronicspoint.com/googlesearch.php?cx=002919058480771089906%3A03mranmmdze&cof=FORID%3A10&ie=UTF-8&q=Technics+SA-GX550&sa=Search#862

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It is unlikely that the display itself is faulty although it can happen. The typical problem is either the backlight is defective or the suply to the unit has a bad connection. If you can solder, try resoldering the pins on the display itself. The pins on the ends are the power and ground. I don't recall whether or not your model has a separate back light bulb or not. That too could be burned. Chack for that too.

Keep us posted,
Dan

Mar 02, 2009 | Technics SA-AX540 Receiver

1 Answer

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Ron- The fan does not turn on when the receiver is first powered on, it will run when the amplifiers begin to run HOT, they are kinda controlled by a thermo switch, if the fan does not turn on usually the receiver will shut down and display a OVERLOAD message in the display panel. My advise is to keep the unit well ventailated with plenty of breathing space around the top vent closure, this will allow air flow when loud volume output is used. Also use the rated ohm speakers with the SA-AX7,

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Dec 18, 2008 | Technics SA-DX940

1 Answer

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Operationg instructions says it is "F 70". When it appears it says to turn the unit off, disconnect the aC power supply cord, then reconnect and turn theunit on. Consult your dealer if "F-70" remains on the display.

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1 Answer

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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.
petertaussig33@hotmail.com

Feb 23, 2008 | Technics SA-DA10 Receiver

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