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Hi, I Have a Warfedale pro BX1780sd unit, last night during a performance the mains fuse (8Amp) on the back of the pannel blown. I looked in saide today and found that both the 15 Amp fuses inside the unit had also blown. Just for information I am using Bose speakers with a Bose active EQ unit between the "monitor out" and "power amp in" Is it worth me just getting some more fuses, or is it likely to be more involved? many thanks Dave

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  • Grinwolf Sep 10, 2008

    I'll have a look, thanks for the advice

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Check shorted rectifier diode in main power supply,check shorted power transistors,if it is power IC amplifier unsold it put fuse if doesn't blown up the problem is solve.

Posted on Sep 07, 2008

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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.

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