Question about Panasonic SA-HE7 Receiver

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Intermittent F70 Error

Thanks in advance to anyone who can help me with my issue. As you may have guess (given the location of this post) I have a Panasonic SA-HE7 which has served me well for almost three years. However, now after about ten minutes of operation, the power will cut and F70 will display on the screen. The only way to remove this is to power off the unit and allow it to cool, after which I will get the same ten minutes of operation before the problem reoccurs. Having searched the F70 issue online, it appears that it usually indicates a blown fuse. However, in this case, the user would not be able to use the unit at all which suggest this is not the case. Also, when I remove the case, of the three fuses inside, all appear to be intact. Another thought I had was that the fan may not be kicking in, hence the apparent overheating, however this is not the case. The fan will start as normal once a certain level of volume is reached. Any help/ideas/comments that anyone can provide would be greatly appreciated. Thanks again James

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  • Anonymous Dec 12, 2007

    I've got the same problem.

  • linomax Oct 26, 2013

    Error F70 may be due to poor contact fuses. Check out all the (three) fuse.

  • DL Senrab
    DL Senrab Jan 05, 2014

    I used the connect a wire between R1702 and Q 1702 and this bad boy works great now havent got the F70 error since.

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9 Answers

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F70 interrmintent problem caused by (Ic-current) interupted, supply for cpu, Q1702 (emitter point) high resistant to IC1701, suggestion- connect a wire between these component due to pcb track poor contact.

Posted on Nov 09, 2007

  • Ericbe75 Aug 10, 2011

    Wow... will resolve my problem !

    Merci

    Ericbe75

  • Burien Cox
    Burien Cox Nov 06, 2013

    I also had this problem. i re-flowed the solder. works now :)

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I now also have this problem. I don't fully understand the instructions given above, can someone please give more detail?

Posted on Dec 11, 2009

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Thanks for the Informations about the Q1701!
I only made the solding points of the described transistor-legs new. (look to the broken soldings at the picture).
Now it is running well without the Error F70.
Intermittent F70 Error - 189f51fa-0fd8-4138-8c22-34dd09b49493.jpg

Posted on Sep 08, 2013

  • Burien Cox
    Burien Cox Nov 06, 2013

    This was the exact same for me.

  • Krisztin Varga
    Krisztin Varga Jan 27, 2014

    Thank you for the picture. Helped me to find the IC.

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Solution #2 worked fine
model panasonic sa-he75

thx!

Posted on Nov 26, 2009

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I think more detail is needed. What leg of the R1702 resistor do you solder the wire too? One of the legs seems to be connected directly to the base leg of the R1702 transistor. So do I want to solder the wire to the other leg?

Posted on Mar 09, 2010

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  • kazmisz Oct 11, 2010

    Please see following picture:http://obrazki.elektroda.net/68_12548484...

  • Bert Nov 19, 2012

    great! the board was slightly different, without the stripe on it, but I did locate the points and it worked fine, I am listening to the radio right now.... big CHEESE and BIG THANKS!

  • Bert Nov 19, 2012

    great info, thanks, I did that on the picture and my Panasonic is working like a charm! Cheers mate - have a beer from me!!

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Hi James. I had just a SA-HE7 for repair. It had a F70 error after 30 min. The solution.: On the DSP board the power on de collector of Q1702 fails. That was because the busses through the board interupted. I have connected a wire between R1702 and the collector of Q1702. I have tested the set now for several days, and the F70 problem is resolved. I hope that this is also the solution for your problem. Regards Ron. Radio TV Service Zeeland. rtv-service@zeelandnet.nl

Posted on Jul 05, 2007

  • linomax Oct 26, 2013

    Error F70 may be due to poor contact fuses. Check out all the (three) fuse.

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Very handy info. After checking all the fuses (all fine). I came across this thread. Fixed the fault by simply refreshing the solder joints on the those components, and others that looked sus around the area.

Posted on Jun 21, 2015

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I look for SA-HE7 electric circuit !Help me,please!thanks,for earlier!

Posted on Feb 21, 2013

  • linomax Sep 30, 2014

    Check the fuses near the transformer pitaniya.Vozmozhno poor contact.

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I have same problem with my SA-HE7 but dont know which leg of R1702 need to be wired to which leg on Q1702

Posted on Mar 19, 2010

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  • hobit464 Mar 19, 2010

    hobit

  • linomax Feb 24, 2013

    Tell us on what to look for board resistor R1702 and transistor Q1702? And what foot solder a resistor to the transistor (collector)?

  • linomax Oct 26, 2013

    Error F70 may be due to poor contact fuses. Check out all the (three) fuse.

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