Question about Panasonic SA-HE200 Receiver
My name is Rob from hamburg, germany.
could you help me with the repair of my receiver?
Which component do I have to replace to have rid
of this problem once and for all.
Its been in for replacement of a fuse (F70?) three times,
the time has come to do it myself.
Look forward to your reply.
My name is Andrew. I got the F70 error during normal use immediately following all the sound shutting off. Other input channels seemed to work and the unit worked normally after I turned it off and on again. However, the problem repeated after about 7 minutes. The next time I tried using it it worked for about 45 minutes and then shut off and gave F70. It seemed to be running hot. I removed the cooling fan and tested it and it works. Is the unit not powering on it's fan? has it blown a fuse? seems like an odd problem. Please help me!
The F70 error code is not for the replacement of a fuse. It is an error code for the microprocessor having trouble communicating.
Try leaving the unit unplugged overnight and then plug it back in again. This should clear that code.
If it does not clear the code, try doing a hard reset with the unit NOT PLUGGED IN.
You would need to use a small metal pick or small flathead screwdriver and use a jumper to ground the pick/screwdriver to the chassis of the unit. Then you slowly run that pick over each pin of the micro, thus grounding every pin one after the other. This way you are sure to ground out the reset pin.The unit must not be plugged in when you do this. It will clear all memory and settings.
Without having this unit in front of me to properly troubleshoot with the proper tools, anything told to you is only a guess. Unless the person advising you has direct experience working on these units, they can not possibly know the solution to this problem.
I work at an authorized Panasonic service center and have never seen one of these receivers with that code and all it needed was a fuse replaced.
I have seen them needing the microprocessor replaced, but that is not something you could do yourself without the very best soldering skills. The microprocessor is a surface mounted component with 80 pins and is a very difficult component to replace. You can see it on the display panel near the middle of the board.
That code is no guarentee that the micro is bad either. if it doesn't clear the code by the way I have told you above, it needs to be serviced. Like I said, nobody can troubleshoot the communication of the micro without an O-scope, schematics, and a very good knowledge of how they work.
I think the previous service center charged you for a fuse and all the did was a hard reset of the unit.
Let me know how you do with this solution and please do not rate it until we have had a chance to explore other options. I actually have repaired a couple of these before.
Posted on Jul 02, 2008
And i have to add ..... nothing I think tech got this one
oh BTW there is a second way to clear and reset,,
Face the microprocessor where you ncan read the text in the propper orientation,, much like you are reading this one
count 3 pins rom the bottom and ground pins 4 and 5 then 3 and 4 using a bladed (FLAT HEAD) screw driver.. or check 3 pins from the tom then ground pins 4 and 5 then 3 and 4
I hope you understood that mess
Posted on Jul 14, 2008
There is a heat detection circuit that will shutdown the system once it starts to get too hot to prevent damage to the components. It sounds like the drive circuit for the fan is not working. This is a failure of the electronics inside the unit. This should not happen very often. If this unit has been in for repair for this problem and still has the problem, the repair was not completed. The F70 indication is the "protect mode" indication. The fact that a cool down period restores operation tells me that the problem is heat related and thus is either the fan not working (being told to run) or the heat detection circuit is defective and shutting down the system when it should not.
This should be easily found with the proper test equipment and the unit on the test bench. If you are not happy with your local servicer, try changing the transistor that is located close to the fan connector. That should be the fan "switch" that may be defective. Also, check to see if the fan is actually turning at all. You have tested the fan itself, we now need to verify that the driver circuit is functioning.
Keep us posted on your progress.
Posted on Jul 02, 2008
I think your having some input problem that is very high voltage so that fuse is getting blowed .....your voltage regulator might not work properly ...
Posted on Jul 02, 2008
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Posted on Jan 02, 2017
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