Question about Panasonic Audio & Video Receivers

13 Answers

Panasonic sx1250 stereo receiver without function in one channel of each of the three speakers. Is this due to a fuse (and where are the fuses) or is it some other problem? The receiver works well otherwise but one of the speaker of each pair does not work --just the left works and not the right. Thank you, frodo

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  • frodo19sxt Oct 08, 2008

    This problem developed when I was trying to hook up the speakers connecting the the speaker wires to the receiver. A little flash light like a blown fuse occurred and one channel for each speaker no longer worked. If a wire were cut would it be in the receiver?

  • frodo19sxt Oct 08, 2008

    I was trying to rewire the speaker wires to the receiver and suddenly there was a little flash of light in the receiver and the left channel to each speaker no longer worked. If a wire were cut would the wire be located in the receive?

  • frodo19sxt Oct 08, 2008

    I am not familiar with repairs and if this is a problem with the output IC is this something that can be repaired?

  • frodo19sxt Oct 08, 2008

    Thank you for your help. I am sorry but the receiver is a pioneer and not a panasonic. I appreciate your help and it sounds more like a problem requiring service by a professional. Is there any place I might find a list of repair people in the northern Vermont/Burlington area? Thanks again.

  • frodo19sxt Oct 08, 2008

    Which wire do you mean? Do you mean the wire which plugs into the electric outlet?

  • frodo19sxt Oct 08, 2008

    Thank you, I think I might need to take the receiver to the Electronic Hospital in Williston,Vt. the place I learned about from your e-mail. Do you have any idea how much the repair might cost and/or what the receiver is worth and,therefore, how much might be reasonable to spend? Thanks again!

  • frodo19sxt Oct 09, 2008

    Thank you very much. I appreciate everyone's answers and it looks like I will take the receiver to have it repaired at the Electronic Hospital in Williston,Vt-the place sent to me in one earlier response. I am curious what you estimate your repair will cost and what a Pioneer sx1250 is worth. Thank you again!

  • frodo19sxt Oct 11, 2008

    Thank you very much--I will be taking the receiver to a shop for repairs.

  • frodo19sxt Oct 12, 2008

    Dear Inno 73, Thank you very much for your help. The receiver is in the shop which was recommended earlier through Fixya. I appreciate your comment regarding the value of the receiver and the cost of the repair. Al of the comments from FixYa have been very helpful. Thank you very much. If there is anything else I can do please let me know. Thanks again, Frodo

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Hi,
Please use our Fixya service by entering the ZIP pin number on the starting page.. It will automatically guide you the nearest service center..
Have any queries, please let me know..
Thank you....

Posted on Oct 09, 2008

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Since most of the solutions has already been provided to you so what I would suggest is that you contact geeksquad and get it repaired by them. Contact this no. 1-800-GEEKSQUAD. Depending on the problem the repair will cost you somewhere between $29 to $100.

Thanks.

Posted on Oct 09, 2008

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Unplug the receiver, then open the top and look for some glass fuses in the area you seen the flash of light. The glass fuses are about an inch long and are cylinder shaped with metal tabs at each end that clip into the holders. The bad fuse will look a little black around the glass. After replacing the fuse with the same type and rating of fuse (you can get them at radio shack and the ratings are on the metal tab on one end of the fuse) then you plug the receiver back in and turn it on. If the fuse blows again, you need it serviced, if not, it should be OK. Please check the fuses first with the power cord unplugged and if this is your problem please rate this as a FixYa. Let me know if you require any further help, I have reapired many of these type of Pioneer recievers.

Dave

Posted on Oct 08, 2008

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I can confirm that you have one channel that is blown. This unit has only a left and right amplifier. It does have A,B and C speakers only 2 sets of which can be on at a time. Repairing the blown channel should not be a major effort for any shop that handles audio repairs. Because of the particular model, the parts will run a few bucks though. Figure on $50-$75 just for parts. The output transistors for this model run between $8 and $15 EACH. You will need two outputs, two driver transistors and possibly a number of resistors. Depending upon which component failed first, there may be repairs required to the low voltage amp board as well.

Let me know if you wish to attempt this repair and I can get you the specific parts that will need to be changed.

Dan

Posted on Oct 08, 2008

  • ABRsvcs Oct 08, 2008

    Just caught your last comment...



    This unit is relatively sought after and is worth over $600 easy if it is in good cosmetic shape. Yes the repair is worth it even if it gets to $200.



    Dan (who rebuilds and repairs these all the time.)

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  • 92 Answers

The flash could be a fuse, a circuit trace, a resistor or transistor burning up as s result of the short.
As already stated, if you're handy with some test equipment and a soldering iron, get in there and find it. If not there's probably not much you can do yourself and you should seek out some professional help.

Posted on Oct 08, 2008

  • Inno Laur Oct 11, 2008

    The repair on that receiver could be widely varied I'm afraid. This is due in large part to it's age. Having said that, it is a VERY sought after receiver being Pioneer's flagship model of the late 1970's. At that time it was the most powerful home stereo receiver available and even today it rivals many home 2 channel receivers in build quality, sound quality, power output and as you already know, sheer weight!

    You could probably have a repair done that will get it going again for $60-100 I would think. That is going to vary depending on the area you're in. There are far fewer electronics shops than their used to be which of course drives the price up.
    If you want it completely gone over, which will improve it's reliability and sound quality you could probably expect to spend $300-500. It depends on your intended use and how attached you are to it.
    Just for curiosity, do an E-Bay search if you're wondering how valuable it is..........it's surprising for a unit of it's age! It is a testament to the quality of older equipment that's for sure.

    Good Luck! And enjoy your classic receiver.


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The typical failure modes for abused musical instrument amps are either shorted or open voice coils in the speaker, followed by the destruction of the final amplifier stages. It starts out as a buzz from the cone. The reason for all this is that the voice coil/spider assembly overheats and then distorts. The clearance between the voice coil and the magnet pole pieces are fairly small and a little deformation of the cylindrical voice coil will make it bind and buzz. After that happens, it heats up alot faster and either fuses open or wears through the voicecoil wire insulation and shorts to the pole piece. The repair is usually to replace the speaker. The real expensive pro-audio drivers like the EVs, JBLs, etc could be reconed cheaper than replacement but low end drivers like those in Crates aren't cost effective to have repaired (nobody will touch them - [but see section above]). On the rare occasion that one can find someone to recone them, they usually have substitued parts and really screw it up so you have to buy a new speaker anyway. The moral is take care of your equipment, especially if you depend

Posted on Oct 08, 2008

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If there was a flash in the receiver itself this indicates that you shorted the circuit for that channel when you open the receiver and look at the main board you will see a break in the circuit . what most likely happened is you reversed the polarity of the speaker wires when you connected. they may be just speaker wires but they do still carry voltage and if you cross the polarity of them they will short the board. if you are handy with a soldering iron you can repair this yourself. find the break on the board and solder a jumper between the breaks this will allow the circuit to be completed and that channel. if you don't have the talent for this just have it repaired at a electronics shop.. please rate this

Posted on Oct 08, 2008

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Hi,
Here is the authorized Pioneer service center near your area.

ELECTRONIC HOSPITAL,
258 SHUNPIKE ROAD,
WILLISTON, VT 05495
USA

Phone: (802) 863-5066



:)

Posted on Oct 08, 2008

  • Karthik P Oct 08, 2008

    Hi there,
    If this was your only solution, I think you should mark this as 'fixya' rating.


    Because, I think this thread will not close until you mark one of the solutions as 'fixya'




    Thanks,


    :)

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Most likely you blew a fuse or another piece of circuitry. Follow the left wire into the device and look for a blackened component. Usually 9 times out of 10 it will be the fuse that would do what you are describing

Posted on Oct 08, 2008

  • Benjamin Patri
    Benjamin Patri Oct 08, 2008

    the speaker wire hooks into the back of the receiver, follow that into the circuitry inside the unit

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Hi,

Pls confirm that it is a Panasonic and not a Pioneer.

If the output (speaker terminal/wiring) were accidentally shorted/mis-wired, it is of course possible that the protection circuitry has kicked in. But since the other channel works, that would mean that the protection is localized in just one channel. As you have posted, it is possibly a fuse. This would mean opening the unit. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Incidentally, you could use the still working channel as a template/pattern in performing passive resistance/continuity checks while diagnosing.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Oct 08, 2008

  • Louie  Role
    Louie Role Oct 08, 2008

    Thank you for confirming that it is a Pioneer. Appreciate your quick post/comment back. If you would be so kind as to go to the main page of FixYa by clicking on this link, there would be a space provided (rightside, halfway down)
    wherein you could enter your zipcode and click on the "Go" key. On the
    page that will be displayed, pls click on the Clock radios underneath
    Personal Audio. there would be several repair facilities and you could
    choose the nearest.

    Alternately, you could try your friendly neighborhood electronics service center.

  • Louie  Role
    Louie Role Oct 08, 2008

    Oooppps, sorry that should be bottom left of the page, Home Audio, Amplifiers and PreAmps.

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Hi

It is highly likely that you have a failed output stage to the channel that does not work. This has been caused by shorting out the speaker wires. If the other channel still works, this tells us that the power supply to the output stages is ok as both channels share the same supply. The output IC will need to be replaced. This is not really a user serviable part to change. If you have some experience with this sort of repair work, then I would prescribe changing the output IC(mounted to the large alloy heatsink.
I am happy to answer any further questions you may have Good Luck

regards
robotek

Posted on Oct 08, 2008

  • Graeme Ross
    Graeme Ross Oct 08, 2008

    Oh, as it is a 70's vintage Pioneer, it will use transistors, and not an IC in the output stages. It may still be well worth while to remove the covers and check for any blown fuses(be sure to disconnect the power first) If the fuses fail on powering up the unit, then you have shorted output stage transistors. This is not an easy fix for the novice. It may cost you $100-180 to repair. Some parts are getting scarce for these earlier amps also.

  • Graeme Ross
    Graeme Ross Oct 08, 2008

    enter you city and details directly into the feilds at the top right corner of this page, and you will get a Pioneer agent near to you that would be able (and qualified) to help you. Good Luck

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U ha ve to refix the cable of channel 2 in circuit.
find it i give u link of manual.
also see the settings that u not disble the second channel
http://audio.manualsonline.com/manuals/mfg/pioneer/pioneer_stereo_receiver_product_list.html

Posted on Oct 08, 2008

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  • 116 Answers

May be the wiring gets cut some where

Posted on Oct 08, 2008

  • 1 more comment 
  • mastermind10 Oct 08, 2008

    yes.

  • mastermind10 Oct 08, 2008

    yes .what you are facing can be repaired.its a solveable problem.

    a chip level repair person can repair it in 20 minutes.

    so get it repaired.it is worth getting it repaired.

  • mastermind10 Oct 08, 2008

    on the fixya home page.there is a repair service option.just enter your zip code and you will get the list of technicians near to your area and with phone numbers.you just can call.and do the remaining.

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