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BAT VK-500 Need help!!!
BAT VK-500 Need help!!!
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Old 23rd November 2014, 01:58 AM   #1
murillollirum is offline murillollirum  Brazil
diyAudio Member
Join Date: Nov 2012
Location: Brasil
Default BAT VK-500 Need help!!!

My BAT VK500 does not work the left channel.
Is a dual mono design using only n-type mosfet (24 per side)
It has 2 green lights that when it's off shows that there is a problem with the amp, so that's the case.
So I changed the two fuses that were blown and it starts, after 2 minuter goes off.
A resistor blow away, the R16, I do not know what is the value, sorry I'm not a technician.
My technician changed the resistor (he said that is a kind of circuit protection resistor) to other one, and started again... nothing worked.
So he examined the mosfet section and noticed that 2 mosfets were bad, changed the mosfets and the resistor of each, also the R16 resistor and the amp worked for 30 minutes very fine, very cool.
After that stopped again, he looked for the mosfets and one of the new changed was bad. Changed again, changed the resistors, ie... worked fine for some time.
I brought it to my home, turned on and wait, after one hour, the left channel became very, very hot, it stopped again, I open iit and saw the resistor blown again.
Please give me some indication to tell to my technician, here were I live there is no information and the service is very stupid.
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Old 23rd November 2014, 02:07 AM   #2
murillollirum is offline murillollirum  Brazil
diyAudio Member
Join Date: Nov 2012
Location: Brasil
Also, if these two problem mosfets are removed, and the amp work only with 22 mosfets, the problem disappears, in the last case I will adopt this.
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