Bit of a long shot, but hoping someone here may be able to help.
Anyone have any scrap B&W spectrometer PCBs from one of these units, perhaps with mechanical damage or missing / damaged optical assembly? Specifically I’m looking to recover one or two pieces of U401 IC, Xilinx XC9536. This is a B&W programmed part so can't just get one from Farnell.
A bit of background - I’ve been passed a friends spectrometer to repair. It had been connected to 12V rather than 5V.
When I powered it from a bench PSU set to 5V, 1A limit, the PSU went to current limit at just under 1V.
Thermal photography showed only one IC getting hot, that being the Xilinx XC9536. Removal of this IC returned current consumption to near normal, and allowed communication via RS232, indicating a fair chance of returning to normal operation if U401 is replaced.
Thanks in advance...
Tracing out the board to get connectivity to the CPLD, I tracked the ADC 16 bit bus to the 2 FIFOs (2k x 9).
FIFO read port goes directly to the 8051. Unfortunately, there I came unstuck. I found 3 sequential data lines shorted together. Lifting the respective FIFO, the shorts remained. The 8051 still runs and communicates over the UART, but it looks like the 12V over-voltage took out some GPIO drivers. Another factory programmed device. Since a sporty, modern, micro with external 16 bit ADC could mop-up the entire board, I don't think I'll be continuing with reversing the CPLD.
Dear Every one,Re: B&Wtech 473nm unit / Spectrometer Mods & Info
i think that this is may be the right one :
some one did this before?
Hi, can you tell me more about these replacement optics, please?Regarding the alignment, I have developed a compensation optics to replace the LPF. It should solve the focus shift issue (pretty much to a level tolerable within a few dozen microns). Kindly let me know if anyone is interested in since I got plenty these optics made.
Hi Paul,The thickness of the grating should have no effect over its ability to work in the spectrometer. I would be more concerned with the blaze wavelength.
Yes Paul .... so it is .... not nice to do it and you may need some beer to do it .... and than ... it will not be easier.That is the reason for the focus mirror in your spectrometer. Even if you had a B&W Tek grating with 600 l/mm you would still need to refocus. Anytime you change something in your spectrometer's optical bench expect to do a realignment. They are never fun and can be very frustrating at times, but it is what it is.