Question about Technics SA-DX950 Receiver

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Technics SA-DX950 intermitently sounds blown out

I turn on my Technics SA-DX950 receiver and the sound is fine for several minutes. Then the volume on the speakers will go way up and the sound will be very distorted. It the receiver is shut off then turned back on the problem usualy goes away. I have tried a second set of speakers and continue to have the same problem.

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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

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Posted on Jan 02, 2017

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I have a Technics SA - DX750 Amp Everytime I turn it on I get an error message F70 and then it requests that I turn the power off. This is all it does now, so sound. How do I solve this issue I have...


Hi!

The F70 error certainly indicates a blown fuse inside.
The real problem is why the fuse is blown: there are only two possible reasons
1. there is a short circuit on the output (lines or speakers)
2. you have a blown output transistor (and that means some work and skills to replace).


To be sure, please change the fuse with a same rated fuse (buy more than one because it can blow again). Disconnect the speakers and turn the amp on. If the fuse blows again, it is sure something wrong with the output transistors. If the fuse remains ok, then please check all the wiring to the speakers.

Hope it helped.

Regards,

Bogdan

Aug 21, 2011 | Technics SA-DX950 Receiver

1 Answer

Technics sa-dx 950. F70 on display. ???


This is a shorthand version of protect. See the link below. If you have more questions, please post them here and I'll respond.

Thanks,
Dan

Link: http://www.fixya.com/support/r5390728-protector_means

Aug 21, 2010 | Technics SA-DX950 Receiver

1 Answer

I have a technics reciver SA-DX950 when i tnru on it say F70 on the display


problem is oxidation...Remove and clean the ends of cables with sandpaper slowly...there is slim and flat cable into the reciver (together with five cable)...specially remove it's socket and clean it...


May 09, 2010 | Technics SA-DX950 Receiver

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hello there are 2 big capacitor behind the metal heatsink see if one has swelled up if so change them both then check the output chip to see if there are any dry joints then when you've check all and still the same then you may have to change the output transistor g ood luck

shaun

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Check the sound setting on your TV, is it Fixed level out, if so you have to turn volume up on TV to go through the receiver.

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This may sound like a silly check, but verify that the tape monitor switch is not engaged. What is the quality of the sound when turned up? Is the cound clear or raspy?

Thanks,
Dan

Dec 04, 2008 | Technics SA-DX950 Receiver

1 Answer

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The most likely culprit here is the output protection relay. The contacts are a little corroded and the higher volume "jumps the gap" temporarily "cleaning" the contacts. The relay should be changed. I don't have the manual with me, but the following relays are in the unit. One of them is the speaker relay:

Part # Cost
RSY0054-C $12.63
RSY0040M-0 $ 5.89
K6B2AHA00014 $ 8.14


Dan

Nov 12, 2008 | Technics SA-DX950 Receiver

1 Answer

Technics SA-DX950


sounds like the speaker protection relay is operating probably from a dc condition appearing on power amplifiers outputs. probable cause is dry solder joints to the output stages. will need some reworking of the PA stage soldering to fix.

Dec 10, 2007 | Technics SA-DX950 Receiver

1 Answer

Adam's Problem


you have a short circuit occurring in speaker outputs. If you are using the high power inputs of the sub, try disconnecting them first. check polarity of speaker connections to sub also.

Oct 19, 2007 | Technics SA-DX950 Receiver

3 Answers

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

Jun 25, 2007 | Technics SA-DX950 Receiver

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