B&K 2534 DSO channel failing

TheGimp · 1st August 2012, 12:58 PM

I've got a four year old B&K 2534 DSO with the second channel losing it's high frequency response (all the way down to audio frequencies) as it warms up. I noticed this recently when I was running a 1KHz test on an amp. The leading edge started rolling off.

I suspect a component is failing and sensitive to temperature, which makes isolation a bit easier. Warm it up, put a signal in and start at the input testing components with "cool-spray".

I emailed B&K requesting a schematic, but they have not responded.

Does anyone have a schematic for this DSO?

tks

Steven

TheGimp · 9th August 2012, 05:10 PM

CH2 is now off the screen.

B&K did not respond to my request for a schematic.

B&K wants $350 to repair it.

I'll probably get another scope. Maybe a Rigol DS1102E.

I think I'll pop the top on the B&K to see what it looks like inside.

TheGimp · 14th August 2012, 02:51 PM

I opted for a Tektronix 465M instead.

I may try to diagnose the B&K with it even if the parts do not have markings. At least I can isolate where the fault is. If a schematic ever becomes available I'll try to fix it.

1st August 2012, 12:58 PM	#1
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	B&K 2534 DSO channel failing I've got a four year old B&K 2534 DSO with the second channel losing it's high frequency response (all the way down to audio frequencies) as it warms up. I noticed this recently when I was running a 1KHz test on an amp. The leading edge started rolling off. I suspect a component is failing and sensitive to temperature, which makes isolation a bit easier. Warm it up, put a signal in and start at the input testing components with "cool-spray". I emailed B&K requesting a schematic, but they have not responded. Does anyone have a schematic for this DSO? tks Steven

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9th August 2012, 05:10 PM	#2
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	CH2 is now off the screen. B&K did not respond to my request for a schematic. B&K wants $350 to repair it. I'll probably get another scope. Maybe a Rigol DS1102E. I think I'll pop the top on the B&K to see what it looks like inside.

14th August 2012, 02:51 PM	#3
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	I opted for a Tektronix 465M instead. I may try to diagnose the B&K with it even if the parts do not have markings. At least I can isolate where the fault is. If a schematic ever becomes available I'll try to fix it.