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Main power fuse blows on my sansui g-5700 - Audio Players & Recorders

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  • sanstew May 31, 2008

    I have a Pioneer SX203 Stereo Receiver that blows fuses as soon as power is turned on. I'm not sure what size fuse I should be using. I've been using 5 amp fuses.

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My Sansui G-5700 blew a fuse (i think)...where can you find fuses for this thing?

Posted on Jun 22, 2008

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I would check to see if the fuse is a slow blow fuse . Then I would check the power caps. that are shortly after the transformer for dead short and or the brigde rectifer or diodes for shorts . If they seem good, if it is possible to disconnect the transformer seconday leads and put a fuse in and if it still blowns it would be the transformer itself shorting out.

Posted on Jun 02, 2008

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Fuses for sansui G-5700


If you wish to get more details visit the site linked here. http://electronicshelponline.blogspot.com/ Circuit diagram of many popular brand devices are given. You can get details there.

Feb 09, 2017 | Sansui Televison & Video

1 Answer

WHY DOES MY RECIEVER KEEP BLOWN FUSES WHEN I TURN THE POWER ON?


Fuses blow when there is an overload. The cause being a shorted semi-conductor that is acting as if it was a piece of wire.
Nine times out of ten it's the main power amp devices located on the heat sink that have gone. Often caused by faulty speaker wires, or wires touching each other, so check all your speakers and cables for faults, after you have fixed it!

Nov 17, 2016 | Sansui Audio Players & Recorders

1 Answer

Where can i buy a power transformer for Sansui 3900z ?


Let me guess...you took it somewhere for repair, and they told you it had a bad transformer and they couldn't fix it (after they took your money). Sansui began life as a transformer company, and unless something really silly was done (like replacing the stock fuse, which is probably 3 or 4A with a 15A fuse of something). I might mention that 'some' units sold for various locations have a thermal fuse installed internally to the transformer. I dunno if your model has this or not. I mention all of this because often times the phrase 'it has a bad transformer' is lame techspeak for 'I don't wanna fool with this thing'. If it blows the mains fuse on power up, then the most likely fault is that it has blown power transistors at the output of the amplifier. If it 'really' has an open primary winding in the power transformer, then it may well have a thermal fuse that has opened. Gary Brown in Orono, ME has fixed a few transformers for me with this issue. Google can help you find him.

Dec 24, 2014 | Sansui 3900z Stereo Receiver

1 Answer

There is no sound coming out


I had a very similar problem with my Sansui G5700. Powers on, but no sound. My solution may not fix your problem, but this is what I did to solve mine. Removed the wooden cover. On the main power circuit board ( red circle on attached image) there is a safety relay that activates the speakers. Carefully remove the plastic cover ( should come off easily) spray the contacts with contact cleaner. ( do not use CRC. use a dedicated contact cleaner) Double check all your fuses. Refit the plastic relay cover. Refit the main wood cover. Power on, and hopefully it works :)...Mine has not missed a beat since.( If this didn't work, check if the relay actually switches on and off. The relay may have an open circuit and needs to be repaired/ replaced) 2f650e9f-0e26-4560-8d6b-d075d71217ee.jpg

May 04, 2014 | Sansui G-5700 Tuner/receiver

1 Answer

My sansui 1000 receiver keeps blowing fuses


Fuses blow when there's an overload. This is often caused by the main power amp devices located on the heat sink. If they are transistors you can test them with an ohm meter. It will be just like you have put the two test probes together on the separate pins of the device.

Mar 24, 2013 | Audio Players & Recorders

2 Answers

Sansui G-5700 protection light wont go on


Try checking the speakers and connections. Those symptoms occur if there is a short. Disconnect all spkrs, turn it on and if it stays on connect one speaker at a time until it shuts off.

Jan 19, 2013 | Sansui G-5700 Tuner/receiver

1 Answer

Keeps on blowing fuse


Hello
If fuse blows off repetedly, it shows that there is a direct short inside the power supply section. You just check the mains rectifier diodes for short. iIf a rectifier stack is used desolder it out and check for short. In some sansui sets, ther is a metal oxide variste connected across the supply line inside directly. It is for line spike suppression and an overvoltage protection. If any of the above appears on the power line, the varistor will get shorted, and the fuse will go out, to prevent further damage to the circuits. Check that varistor for short. Check the resistance across main filter capacitor for any direct short. If it seems shorted, check the switching transistor for collectror to emitter leak, Resolder it out and check. These are the main reasons for blowing fuse. If the switching transistor has got leaked, you must check the entire SMPS control section, especially in case of used zener diodes, before replaceing a new transistor. OK.
If you wants anu further assistance, inform me through Fixya. Ok.

Nov 05, 2010 | SansuiS2746 TV

1 Answer

Blows fuse when turned on


this is a normal behavior if one of the power supply transistors have blown. take the unit to an enlectronics repair. they can either change the transistors affected (usually more than one) or replace the power supply board.

May 29, 2009 | Sansui DTV3200 32" TV

2 Answers

Old sansui amp BA-FI turn it on an it blowes the 8 amp fuse instenly


Hi again,

You might have need for the following information:
Hope this be of additional 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.

Oct 30, 2008 | Audio Players & Recorders

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