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Roland Jazz Chorus 120 no signs of life! Plug fuse & back of amp mains fse OK Mains transformer??

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The transformer on these units contains an internal fuse that may have blown. With the unit unplugged, measure across the primary winding of the transformer. It should read low ohms. If you get infinity, the primary is open and will require replacement.

Dan

Posted on Nov 11, 2008

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If you have a multi meter then unpug from mains supply.With meter
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I have a cambridge audio A300 V2.0 amplifier that wont power up. i've checked for power at the switch and there is power and i've checked on the main board at the fuses but there is no power there, the...


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I have a Pioneer SA_410 Amplifier. Has open circuit mains transformer. Could you advise what its AC secondary output voltage & current are? Regards


I have replaced many thermal fuses in power transformers. Is the primary open?? If so, cut the copper shield on the primary side of the transformer with a pair of cutters and peel back the paper insulation to reveal the thermal fuse. Replace it and everythings OK!! If the secondary is bad there's no hope, of course. Anyway, in the meantime I will research your question and post again very soon. I have several old pioneer schematics and know where to find what I need.

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The unit has no power when pluged in it must have a blown fuse as i said before how do i replace it


Hi diamonddan11

I have posted to your original request for help the details of this. here is a sumary


  1. mains power fuse FU11 is located INSIDE the deck on the same circuit board and the mains on off switch.
  2. There is a thermal fuse that is not changeable inside the widnings of the transformer. This is can be repaired but generally it is considered that you replace the transformer
  3. on the printed circuit board attached to the secondary side of the transformer you will find 5-6 pico fuses, or circuit protectors. The are small black 2 pin devices that are marked on the board as IC901 to IC905
  4. the main power regulator board REGB ASSLY also has a circuit protector IC911.
  5. Thjere are several others in power supply areas marked as IC907, 908, 909, 910, 913, 914.
OK, thats a run down of the fuses in the unit. Non are considered to be user replaceable parts. If the deck has had the wrong mains voltage applied, it is likely that it has blown the primary fuse, FU11. If you do replace that fuse, and the unit still does not work, the transformer may be blown, or any one or combination of the Circuit protector type soldered in fuses may need to be replaced also. If you cannot follow what I have given you here, I suggest you take it to a Pioneer Authorised Service Center.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
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I require a mains transformer for an A-H300 or a contact for a repair of the transformer. Part is apparently no longer available. All thats wrong with it is the thermal fuse.


Hi Keith

You can often replace the thermal fuse yourself often, just got to dig for it under the layers of tape and insulator. They often have tinned leads,. If you are outside the USA, you can even just bypass it, so long as the amp still has a fuse in the primary mains cct. Its about preventing fires here, so if you are not sure then don't mess with it.

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.... or failed thermal fuse in mains transformer. this is a workshop repair as it involves mains voltage that can kill :)

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