Question about Technics SUV500 2-Channel Amplifier

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Technics SA-GX370 amplifier

After the unit is switched on it works for 5 minutes then it stops and the message OVERLOAD - SWITCH OFF POWER runs across the display. It also does this when all phonos and speakers are unplugged - any ideas.

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Hi
One of the amplifiers is shorted. Take to a reputable repair person or check www.micromendllc.com

Posted on May 07, 2010

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2 Answers

When I turn on unit, a message "overload" appears.


Check the speakers and the power supply for any signs of shorting.
This is due to the fact that the safety circuit works to switch off the set preventing a high damage.
So check the output for short or the presection .

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1 Answer

Stops working and reads Overload


hi there i have had this problem with technics amplifiers generally with them it was negative and positive mix up between input terminals for the speakers or in other case's running the amp with 2 many speakers.
eg. having 2 speakers Bi wired into 1 input making a 6.1 receiver into a 12.1 which makes the amp struggle causing overload or the worst case is a power unit problem.

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The question is what is causing the overload? The power supply or the output devices on the heat sink?
If you have accidently shorted a speaker wire, then the answer will be output devices, otherwise it could be anything in the power section. You may find a burnt or damged device with either of the causes.

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1 You may have a failing power supply regulating circuit in you amplifier and the fail safe circuit is trying to protect the rest of the circuit.
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Im having the same problem with mine. The problem seems to have started after I placed a vcr on top of the unit. I am thinking that It may be getting too hot. But don't really know.

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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

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1 Answer

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it could be overheating - try aiming a fan at it for a while, see if the problem stops.

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