Bat Vk200

ben goh · 28th June 2006, 08:16 AM

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

Leolabs · 29th June 2006, 02:06 AM

Then you should check for shorted semiconductors.

anatech · 29th June 2006, 02:26 AM

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

lgreen · 29th June 2006, 03:02 AM

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.

ben goh · 29th June 2006, 03:04 AM

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.

ben goh · 29th June 2006, 07:17 AM

Hi Igreen

I wrote to BAT for help.

Nobody bothers to reply me.

There is no local agent here

anatech · 29th June 2006, 12:32 PM

Hi ben goh,
Disconnect any load you may have on the outputs of the amp.

lgreen,
How did you like your amp?

-Chris

ben goh · 29th June 2006, 01:50 PM

Hi Anatech

No load attached

Still blow fuses, suspect PCB problem

anatech · 29th June 2006, 02:21 PM

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

lumanauw · 29th June 2006, 04:52 PM

Hi, Ben Goh,

Are you the FM Acoustic/Naim dealer in Singapore?

28th June 2006, 08:16 AM	#1
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	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

29th June 2006, 03:02 AM	#4
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	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. __________________ My DIY audio projects- PartTimeProjects.com.

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29th June 2006, 02:06 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Then you should check for shorted semiconductors.

29th June 2006, 02:26 AM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

29th June 2006, 03:04 AM	#5
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	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.

29th June 2006, 07:17 AM	#6
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	Hi Igreen I wrote to BAT for help. Nobody bothers to reply me. There is no local agent here

29th June 2006, 12:32 PM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi ben goh, Disconnect any load you may have on the outputs of the amp. lgreen, How did you like your amp? -Chris

29th June 2006, 01:50 PM	#8
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	Hi Anatech No load attached Still blow fuses, suspect PCB problem

29th June 2006, 02:21 PM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

29th June 2006, 04:52 PM	#10
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, Ben Goh, Are you the FM Acoustic/Naim dealer in Singapore?

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