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
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.
Wow... will resolve my problem !
Merci
Ericbe75
I also had this problem. i re-flowed the solder. works now :)
Hi, I have soldered a wire between those two and now I have no error but optical output is not working anymore only on RCA, any ideas ?
What solder did you re-flow please [email protected]
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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.
This was the exact same for me.
Thank you for the picture. Helped me to find the IC.
Yes ! I had the same issue and fixed by resoldering the 6 transistor-legs.
Thank you so much !
tambien lo solucion? resoldando las 6 patas del transistor.
Muchas gracias !
What transistor legs please I stuck
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Solution #2 worked fine
model panasonic sa-he75
thx!
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. [email protected]
Error F70 may be due to poor contact fuses. Check out all the (three) fuse.
I have an SA-HE70 and after several failed attempts to find the source of the same issue. I refreshed the soldering on all of the dodgy looking joints and F70 was still coming back after 10-20 mins. Then I managed to measure the increasing resistance between the outlet of R1702 and the mid-pin of Q1702 while the board was warming up. So just like the anonymus hero above, I soldered a jumper wire to directly connect those pins and it solved the issue. Seems like it's a common IC printing issue with these boards.
Hi, I have soldered a wire between those two and now I have no error but optical output is not working anymore only on RCA, any ideas ?
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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?
Please see following picture:http://obrazki.elektroda.net/68_12548484...
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!
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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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.
I look for SA-HE7 electric circuit !Help me,please!thanks,for earlier!
I have same problem with my SA-HE7 but dont know which leg of R1702 need to be wired to which leg on Q1702
hobit
Tell us on what to look for board resistor R1702 and transistor Q1702? And what foot solder a resistor to the transistor (collector)?
Error F70 may be due to poor contact fuses. Check out all the (three) fuse.
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I've got the same problem.
Error F70 may be due to poor contact fuses. Check out all the (three) fuse.
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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