Question about Panasonic SA-HE70 Receiver

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My receiver (SA-HE70) shows overload on the display, I know that someone probably shorted the speaker wires. How can I fix this or get a service manual for it?

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Diusconnect all the speaker wires. Still overloaded? Y= take it in for service. N= isolate which speaker path is causing the problem.

Posted on Dec 12, 2009

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I have a panasonic SA-HE70 amplifier and all it keeps doing is scrolling OVERLOAD.... why??


hi,.

First of all remove all the speaker connections from the amplifier. After that power the amplifier and check that it gose Over load ( protection ) show or not . if not, then any of the speakers or its wiring have some problem. If so the reconnect the speakers one by one and switch ON the amplifer and check.find out on wchi speaker it shows lover load.


if the amplifer shows overload even after removing the speakers then you have to check the amplifiers hardware.

Also added the procedure how to check the amplifier satge. You should have a good knowledge in electronics to do the following. Also need testing instuments.


AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are five amplifiers in this AV receiver. This problem occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.

For that you need digital multimeter,soledring iron screwdrivers etc

Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components

OK

Sep 19, 2011 | Panasonic SA-HE70 Receiver

1 Answer

I have a panasonic sa-he70 av control receiver, it is showing on its screen OVERLOAD, SWITHC OFF POWER, i did it twice and still apperas same message. Is my equipment damaged or I just need to reset it?


Page 16 of the manual has recommendations.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Jul 27, 2011 | Panasonic SA-HE70 Receiver

1 Answer

How to hook up external amp need to know how to run jacks to the amp and speakers which out put for amp to run the front speakers on a panasonic sa-he70


Manuals help.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Panasonic-SA-HE70K-Receivers-manual/id/312ag701/t/2/

Not knowing anything about your 'external' amp or how you want it to function the only thing you could do is feed it the analog stereo output of the SA-HE70 from one of its OUTs (Tape or VCR). It won't be volumed-controlled by the SA-HE70.

Jun 01, 2011 | Panasonic SA-HE70 Receiver

2 Answers

Have recently had an "overload" displayed. Have


HI:
Usually receivers go into overload due to a bad speaker make sure you disconnect the speakers also to make sure its overloading from a bad speaker. If the unit still shows overload even with all speakers disconnected, then your main amplifier output has a short usually a shorted output transistor is the cause. Unplug the speakers one at a time to and turn the unit on after disconnecting one of the speakers , to determine which speaker is at fault.

Jan 23, 2011 | Panasonic SA-HE200 Receiver

1 Answer

To smarthome2 Regarding the panasonic SA-HE70 overload issue. Is there any place where I can get a free service manual or schematic to troubleshoot this myself?


Not very likely. Even to find one is a tough job. If you do find a source, expect to pay between 20-30 for it. I will look as well for you. If I find it, I will post the link or get a pdf if lucky!

Dec 23, 2009 | Panasonic SA-HE70 Receiver

1 Answer

DISPLAY SHOWS "OVERLOADED" MESSAGE


Disconnect all speakers at the receiver then turn the unit back on. If it stays on, post a comment and I will walk you thru troubleshooting. If it still shows "overload" it needs to be serviced. Hope this helps

Dec 22, 2009 | Panasonic SA-HE70 Receiver

1 Answer

My technics sa-dx930 receiver stops working and an error message is displayed that says "overload" when i use the "b" speakers for my patio. This is a new problem. i have had the same outside speakers,...


Hey, I own one of these systems. Whenever I touch two of the wires together (shorting it out) the system shuts down and overload appears on the display. My suggestion is too check your wiring (especially in the spliced areas) or replace the wiring to the outside speakers and try it again. If you dont want to try that, take the wires you have hooked to the A speakers and see if they will work on the B setting (a quick troubleshooting technique). Please let me know if it worked for you. Good Luck!

Sep 09, 2009 | Technics SA-DX930 Receiver

1 Answer

Overload displays on the screen


If it say's overload with no speakers connected and the unit on, it needs service. If you need further help, post a comment and I can help you troubleshoot.

Aug 11, 2009 | Panasonic SA-HE70 Receiver

1 Answer

Overload?


From the manual, you may have seen this: Switch off the unit, determine and correct the cause, then switch the unit on. Causes include: ?Shorting (bare wires touching) of positive and negative speaker wires. ?Using speakers with an impedance lower than that rated for this unit. ?Straining of the speakers through excessive volume or power. ?Using the unit in a hot environment without proper ventilation.

Dec 01, 2006 | Panasonic SA-HE70 Receiver

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