Electronics > Repair
Bruel & Kjaer 2144 Dual Channel Analyzer - Power Up Problem and Software
JonH88:
Repair Log:
I was given a Bruel & Kjaer 2144 Dual Channel Real Time Frequency Analyzer to repair. The unit would not power up and I could not find any schematics. I checked the removeable mains to 12V power module and this was OK I then started to look at the dc-dc converter board. I could not find any immediate component fault so I looked at how the dc-dc converter was actually triggered 'on'. I found that the trigger voltage was derived from the CPU memory backup battery which, as the unit had been in storage for a while, was flat. The power-on trigger operates through an opto coupler on the dc-dc converter board. You can access the positive terminal at the top of the 3.6v battery (see photo) so the unit was 'jump started' by injecting a small current (c.30mA) onto this terminal until the battery had sufficient charge to operate the power-on opto. The unit powered up but because the CPU memory battery was flat, the program software was lost and as I don't have any software the unit can't be used at present. I later replaced the CPU memory battery as it would not hold charge.
Software:
I contacted B&K in UK about obtaining software and whilst they were helpful, they could not find any software for this model in their archives. I followed up on B&K's response to ask whether it was acceptable to obtain a copy of the software from another user (i.e. no copyright / IPR issues). B&K checked and confirmed that this would be OK. I don't know the details of the software that is available for this unit. I would like to restore its functions as a basic low frequency analyser. Perhaps the blog contributors can help me find some software to make this unit operate.
cvanc:
I can't help you with software but wanted to say 'good troubleshooting'. Hope you get it going.
voltsandjolts:
If it's the software described in the attached PDF then it's not very exciting, MSDOS & LPT ports, yuk.
FrodeM:
--- Quote from: voltsandjolts on February 13, 2022, 12:26:41 pm ---If it's the software described in the attached PDF then it's not very exciting, MSDOS & LPT ports, yuk.
--- End quote ---
There seem to be several options available, including bootstrapping the device from the IEC port, but the one you mention is not the bootdisk for the standalone analyzer.
I believe something like the one below is the one being referenced. This is from an eBay listing for a whole package with a quite stiff price, of the version of the 2144 with the "Type 7651" FFT software-key installed. There's a similar "Real-Time Analyzer Software" for the base 2144 without the extra key, and a similar pair of software disks for the single-channel 2143 (this last one is on Archive.org, not sure if it can be loaded on the 2144).
But me too will probably soon join the group of people who need a boot disk for the 2144. Lets see when the box arrives.
RAPo:
Don't know if this is any help for you, but I have a (spare) 2133 including original software disks.
The spare 2133 is not booting due to a malfunction psu. The other one starts up
If you need more info send me a pm.
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