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Topic: 24 V keyboard supply
Intermitent fault in auxiliar keyboard
24 VDC power supply on keyboard is on 19.8 VDC
It is possible to fit this value?
How can I do?
- Todd
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Re: 24 V keyboard supply
Hm. I only show the +18v and +5v going to the keyboard. 19.8v is a little high, but it should be in the proper range. I have a little flow chart that shows the 24v going to the monitor.
What sort of problems are you having with the keyboard? It could be the connection between the FPC and the keyboard itself. They're connected by 2 thin ribbon cables that slide into the FPC, sometimes they come loose and need to be re-adjusted. Or they get corroded and need to be cleaned.
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Re: 24 V keyboard supply
Ok. Real supply is 18V DC fron semireg PS, but is labeled in connector 24VDC.
Fail is :
When press Update or DCW or PDW, all keyboard holds down and not response. Image is Ok but no key nor truckball.
Sometimes Update; DCW and PWD operates OK ,
Last edited by vitapablo (2010-10-20 09:40:27)
- Todd
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Re: 24 V keyboard supply
So, just to get this straight, you go into Pulsed Wave Doppler.. you get a waveform and you have the 2D image on the upper portion. When you press Update... the system hangs? Update should freeze the 2D image and allow for a more precise visualization of the doppler waveform. If you press it again, it should make the 2D image update at a slower pace, with a slight visual decrease in the clarity of the waveform.
If it's slowing down dramatically, then it could be a board processing issue. I'll look into it, but I'm fairly sure that the DAQ and DSP boards control the majority of Doppler processing.
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Re: 24 V keyboard supply
Pressing PWD ,the image remains in 2D without Dopler in a single image mode, and system hangs, without return, but scaning. Idem pressing Update or CWD. When fails , key (PWD; UD; ) light do no turn on, sometimes light turns on and PWD is active and other functions too.
- Todd
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Re: 24 V keyboard supply
Maybe it's the language difference, but it's a little confusing piecing what you're writing into something I can visualize. Normal Pulsed Wave doppler operation is as follows: Push "PW" button, waveform and 2D image appear on screen, 2D image on top updates slowly while waveform on bottom updates quickly, but with poor resolution, push "Update", freezes 2D image, waveform becomes defined.
This is the normal proper operation of pulsed wave, with continuous wave doing the same thing.
What it sounds like you're saying is... you press "PW" and absolutely nothing happens...? For how long? Do you have to reset the system? Or, you press "PW" and nothing happens.. the button doesn't light up, but you're still able to scan in 2D.
It could be the contact switch assembly that houses all the push-buttons on the right hand side. They go bad from time to time. One easy way to tell would be to use the Keyboard test function, but that's only available if you have onboard diagnostics.
Go to this link - On-board Diagnostics - and follow the instructions, then let me know if you were able to access onboard/manual diagnostics.
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