Question about Technics SA-DX950 Receiver

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F70 Error on SH-AC300

Hello... I have a problem on my SH-AC300. It displays F70 and unable to process any of audio input, either digital nor line (analog) sources. Does anybody know how to fix it? Many thanks, Don

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Unit has a blown internal fuse. replace it with exact type of fuse and see what happens. if it blows again, it will need to be returned to a service agent

Posted on Dec 10, 2007


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Its showing F70 error on display. Only workd on DVD mode, when i turn it on any other mode it just shows F70, switch power off. All fuses are ok, no any visibly damaged components

The fuse is a part of the problem it is for safety measures
the problem is in between the power supply regulators, capacitors and power amplifier circuit board.
usually a regulator or an output transistor can cause this error.
hope this helps.


Aug 08, 2014 | Panasonic SA-HE70 Receiver

1 Answer

Have a technics SHGE70 and trying to hook it up to a sony STR-K660P. the receiver has a red and white rcs for dvd audio in and red and whitre video audio in. thats all the rca outlets it has. i unhooked...

I see an EQ and a Receiver with NO Tape Loops or external audio sources mentioned.

Are you implying this used to be hooked up and working? Or are you asking how to integrate the EQ NOW after a move?

Normally the receiver would have a defeatable external loop for Tape recording. THAT is where the EQ or any other processor would go.

The following is mostly boilerplate for receivers WITH a tape loop. You need to understand what will and will not work even if you could attach the EQ.

--- Be advised that the engagement of any device in a Tape Monitor loop on a late-model Audio/Video Receiver will effectively tie the receiver down to stereo-only analog sound reproduction. I'll explain.

The connections themselves are fairly simple but it pays to understand what happens in the loop.

In general, any Line-Level external processor (EQ, dynamic range expander, etc) will go into a Tape Monitor loop on a receiver. A Tape Monitor, when engaged, sends the stereo analog signal Out to the Processor, massages it and returns it to the receiver via the Tape Monitor IN connectors to be passed on to the receiver's internal processes (volume, tone, whatever).

Old school analog stereo-only receivers consistently work this way. Newer digital and audio/video receivers introduce a couple of problems: 1) digital sound processing to simulate a variety of soundfields; 2) multiple output channels, either discrete or digitally-generated.

The latter requires that whatever signal is being processed experiences a maximum of one analog-digital-analog conversion.

EVERYTHING analog coming into the modern digital receiver is automatically converted to a digital signal for internal processing unless you choose a STEREO-only or STEREO-Direct setting. Consequently, no further external analog-digital conversions would be allowed if, say, a Tape Monitor circuit was activated, and a possible feedback loop could otherwise be created in a digital-sourced selection (output to its own input), so the unit is wired to treat the Tape Monitor as the first analog step in the process and defeats any pure digital sources.

In a multichannel unit, what would happen to the other channels if you sent ONLY the Front Left & Right out for processing? The rest would NOT be processed. That logical problem also plays into the decision to defeat digital sources if the Tape Monitor is activated. I don't totally agree with the engineers but that's the way it is. Nature of the digital beast. --

If you wanted to Equalize a single external analog source you would have to connect the EQ Line output to either of the two analog inputs ("DVD" or "Video" in your case) and connect your external source to the Playback jacks on the EQ.

Mar 15, 2011 | Technics SH-GE70 Home Equalizer

1 Answer

Panasonic SA-he75, displays an F70 error.

The F70 error is a code for "protect". See the link below for a general explanation of protect mode. Specifically for your unit, the output amplifier IC has failed. This can be replaced, but the parts cost will be in the $100 range. Please update this if you have further questions.



Oct 08, 2010 | Panasonic SA-HE75 Receiver

1 Answer

I have a digital audio processor technics sh ac500d without remote. This item is stayed at midnight mode. Have you a solution for a day listening.

Monday, september 7th 2009
Thank you but I have bought a remote control ; I think this is the best solution.
Friendly yours.

Sep 05, 2009 | Technics SH-AC500D Receiver

1 Answer


It could be an overload from two speaker wires crossing, check the owners manual for error codes.

Dec 22, 2008 | Pioneer VSX-818V-K Receiver

1 Answer

I am trying to set up a SA-TX50 A/V receiver, SH-300 processor, DVD player to my Philips LCD. I also have a digital cable box, seeking assistance. Mike

1. cable box video out to video 1 in on the lcd , audio out to reciever input 1 ( tv, vcr , or what you want it on )
2. dvd s-video output to lcd video 2 s-video input , dvd audio out to reciever dvd/cd audio input , and add the optical or coax cable digital audio for dolby digital surround sound


Nov 26, 2008 | Technics SA-TX50 Receiver

1 Answer

F70 problem

Look up "Panasonic F70 error" on Google and you will find plenty of discussion about this problem.

The F70 is a blown fuse error. It looks like you can can the fuse yourself, if so inclined, otherwise send it to a service agent.

Aug 03, 2008 | Panasonic SA-HE70 Receiver

1 Answer

Technics SH-AC300 Connection to Power Amp & Pre-Amp

The problem is, that your SH-AC300 needs an amp with 5.1 input (but no decoder). For this purpose technics delivered SA-AX710.
So if you'd like to use your current equipment it would be impossible.
The only option is for you to buy 2 more Power Amps (SE-A900S), so that each of 3 amps would take care for one part of music. (one for FL, FR; one for RL, RR; and one for sub and center).
Another option is for you to buy SA-AX710. Then all the problems would be solved with it.

Jan 15, 2008 | Technics SA-DX950 Receiver

1 Answer

What is F70???

F70 means Blown Internal Fuse change the internal fuse and that should solve the problem if not you may have to change the output

Oct 30, 2007 | Technics SA-DX750 Receiver

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