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avatar: NikkiT
NikkiT
2 posts
Replied to NikkiT's post on December 7th, 2018

We had a power outage some time ago in our lab. Since then, the computer screen remains black. I'm trying to get it functioning again although I have zero experience with LSCs and never used this instrument before (but I'm happy to learn all I can). When we turn on the instrument, the green light on the base of the computer (CRT) turns on, so we know there is power to some extent. But none of the buttons work on the counter; nothing shows up on the screen. Does anyone have any insight as to where I should start so that I can fix the problem? Thanks in advance. My serial number is 7069019. The computer is a Wyse WY-160ES. The printer seems to start up fine.

avatar: dpkleessr
dpkleessr
1041 posts
Replied to NikkiT's post on December 7th, 2018

I worked on those LSC's and their predecessor the LS6000 series for 23 years before I retired from Beckman so I have a little experience with them. The Wyse CRT's are NOT computers at all and were a major source of problems before they were replaced with a thin client connected to a flat screen display. Your CRT has handshaking with the LSC such that the LSC knows the terminal is not responding and therefore will not initialize. The Wyse CRT has special firmware installed so that it properly displays information the way Beckman wants it displayed so purchasing an iff the shelf replacement will not work either. There may be some 3rd party service companies that can provide you with a replacement CRT or more likely the thin client update. Beckman obsoleted the LS 6500 series around 8 years ago so I really don't know if they are still supporting the product line. Bottom line is that there is little or nothing that you can do unless you get your hands on a properly configured CRT like your defective one or you contact Beckman or a 3rd party service company.

As a last resort to verify the LS power supply is functional you can remove the front cover and check out the various voltage test points on the piwer supply and relay board to be sure all is well there too. Hope this helps.

Don

avatar: NikkiT
NikkiT
2 posts
Replied to dpkleessr's post on December 8th, 2018

Thanks for the info! I talked to a nice gentleman at Beckman who said that if the keyboard doesn't make any sounds, then it is probably the internal power supply. I'll have to see if I can find somebody to help me take the front cover off and check the voltage. If it is the power supply, is this something that I can swap out myself or is it too complicated? I was told that the power supply can only be found at Beckman because they don't make them anymore, so they just recycle them. But if I can find one on campus from an inactive counter, then potentially I could put it in myself.

avatar: dpkleessr
dpkleessr
1041 posts
Replied to NikkiT's post on December 8th, 2018
With all due respect to my former colleague aat BCI, I seriously doubt your problem has anything tto do with the power supply. If the CRT is not capable of communicating with the LSC then the counter itself will NEVER initialize and therefore tthe keypad will also be inoperative. Literally nothing works unless the counter goes thru tthe initialization process. After you remove tthe front cover you will see a series of 8 LED's that flash in sequence. When it can go no further you merely look at the LED pattern and compare to the chart that was glued to the inside cover which will tell you at what point in the initialization process it failed. Betting it says a problem with the CRT. Don