Re: BK 2120 scope problem
Yes, I ordered the cap also. No Eparts stores around here, Radio shack was the last to go about 6 months ago.
pneumaticdril
Member
Last Activity: 07-06-2015, 11:15 AM
Joined: 06-05-2015
Location: Chicago,IL
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Re: BK 2120 scope problem
I think I got it now. I am getting 25v out of BD501 and 140v out of BD502. I will order new rectifier. Will post with results.Leave a comment:
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Re: BK 2120 scope problem
My bad, I will go back and check the components. Thanks much!Leave a comment:
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Re: BK 2120 scope problem
Ok, I got new meter and tested all the voltage test points and the 240v is only 25v. I checked back at the transformer and only getting 130vac. I am thinking the transformer is the culprit. Now I just have to locate a new one. Any suggestions?Leave a comment:
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Re: BK 2120 scope problem
it was an old Radio Shack. had it for about 20yrs. Gave me an excuse to get a new one. Ordered an Extech MN16A. Kinda cheap, don't have the money for a Fluke at this time.Leave a comment:
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Re: BK 2120 scope problem
I did read correct voltages at 140 and 24v test points. I had a critical malfunction when attempting to read 2KV without HV probe and consequently I need to get a new DMM. I will post when I get a new meter and verify the voltages. Thanks.Leave a comment:
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Re: BK 2120 scope problem
The trace only moves about 1/4 of inch. The best I can get is a 1/4 inch line in center of screen. The focus and intensity adjust work. I need the trace to go completely across screen to see wave form. When I turn off scope the trace will dance to the left half of the screen, leading me to believe the CRT is good. It's like trying to view the world thru a pinhole.Leave a comment:
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Re: BK 2120 scope problem
Haven't gotten too far, only discovering what is not causing the problem. I had thought I was onto something when I disconnected the leads to the coil surrounding the CRT and nothing changed. I now believe that coil is responsible for trace rotation. Still unknown what can cause the screen to shrink to it's current tiny size. Unfortunately, I have no experience with video circuits. Mostly worked with audio equipment, cell phones, and power supplies. Any guidance would be appreciated.Leave a comment:
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BK 2120 scope problem
I bought a 2120 from Ebay and it has a problem(Of course). The display shows the trace in about 1/4 inch square of the screen. It seems like it's working but the display size is too small. I have checked the output of the transformer and it seems within spec. I do have schematic, but not sure where to start looking. Any help is appreciated. Thanks. -
Re: Need Help with BK Precision 2120 Scope
hello anybody! I just joined site and cannot post new thread. I also have a BK 2120 I just got. It has no horizontal sweep. It only displays a dot in center on display that moves about 1/4 inch from left to right. Any ideas? Thanks!Leave a comment:
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Re: Cleaning corrosion from boards
Have you tried Deoxit? It doesn't seem to leave too much behind and does a fair job on corrosion.Leave a comment:
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