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Old 28th June 2006, 08:16 AM   #1
ben goh is offline ben goh  Singapore
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Default Bat Vk200

Hi

Have a faulty channel on the VK-200. Smoke up on left channel

Have replaced both rectifiers, link broken pcb tracks and it still blow both fuses.

Any infor or schematic to guide?

Appreciate for any help.

Thanks
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Old 29th June 2006, 02:06 AM   #2
Leolabs is offline Leolabs  Malaysia
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Then you should check for shorted semiconductors.
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Old 29th June 2006, 02:26 AM   #3
anatech is offline anatech  Canada
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Hi ben goh,
Do you have a variable DC supply or a variac? You need to apply power slowly so you do not extend the damage. With a little power you can measure where the excess current is flowing before things go bang.

-Chris
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Old 29th June 2006, 03:02 AM   #4
lgreen is offline lgreen  United States
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I have one (well just sold it), the semi's are not accessible.

Too bad.

Perhaps email victor (the president); or post on audioasylum.com; he is the designer and has responded to my prior emails within a day or so.
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Old 29th June 2006, 03:04 AM   #5
ben goh is offline ben goh  Singapore
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Hi, thanks for the reply.

I have checked all the driver and output mosfets and they are

good. The fuses will give way only when the relay clicks. I don't

understand the function of the relay ( not for output ) and the

main reservoirs cap are not grounded. It a rather tough design.
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Old 29th June 2006, 07:17 AM   #6
ben goh is offline ben goh  Singapore
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Hi Igreen

I wrote to BAT for help.

Nobody bothers to reply me.

There is no local agent here
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Old 29th June 2006, 12:32 PM   #7
anatech is offline anatech  Canada
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Hi ben goh,
Disconnect any load you may have on the outputs of the amp.

lgreen,
How did you like your amp?

-Chris
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Old 29th June 2006, 01:50 PM   #8
ben goh is offline ben goh  Singapore
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Hi Anatech

No load attached

Still blow fuses, suspect PCB problem
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Old 29th June 2006, 02:21 PM   #9
anatech is offline anatech  Canada
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Hi ben goh,
I wonder if the bias is disabled until a timeout period has ended. Only one other thing I've seen can cause this. I found a relay with one contact shorted to the coil once.

-Chris
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Old 29th June 2006, 04:52 PM   #10
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Hi, Ben Goh,

Are you the FM Acoustic/Naim dealer in Singapore?
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