Electronics > Repair
Rockland 5840 FFT revival - Step 1- Rechargeable Power Supply board
guswin95:
Hello all,
A short while ago I got a Rockland in somewhat working condition, from eBay. Have never seen any of these before and there is very little info on the net. Always like the idea of a spectrum analyzer for audio. And of course, no manuals nor much info is available anywhere. If anyone has info and can share it, it would be appreciated.
Although it powers up and somewhat works it complains about the NVRAM, and smells hot very quickly.
After a good outside cleaning, I took it apart and it is very unique equipment. It has a back cover with a universal PS and a secondary board that charges a large Panasonic 6V 10-amp battery. Probably used for field operation.
Of course, the Panasonic 6V battery is dead, and shows as a complete open circuit. When initially testing the unit I smelled a bit of overheated components, therefore the need to open up.
In this back cover is the universal supply as mentioned, and a secondary supply that is the board I will concentrate on. There is a big resistor that gets very hot very quickly. It appears a classic design with an LM723 and a 2N3055, but extra parts are unclear the purpose.
BTW, the 3.25V button type battery on the main board was dead, and a rechargeable battery of 3.6V was also dead. Parts are coming for that as the battery was not as common. It's a CR2325, large disk.
I will post pictures and will continue with the secondary board's problems.
bidrohini:
Did you ask the seller for a manual? Without that, the task will be very difficult.
EEVblog:
I had a Rockland FFT once, sold it on ebay. Brings back memories.
edpalmer42:
Really? First hit on google.
sphere.bc.ca/test/stuff/parts10/rockland_5840a_users_manual.pdf
No schematics, unfortunately.
Sounds like a company with a sense of humor.
--- Quote ---Our Apologies
If you are left-handed, we apologize for putting the I/O panel on the right-hand side of the instrument. We had to make a choice...
--- End quote ---
:-DD
guswin95:
Hello all,
Sorry for the slow progress as work and weather have delayed things.
I appreciate the manual, as I did look in Google and not much appeared so far in my search. I knew some colleagues here have a lot better skills finding documents.
I will post pictures now and do a recap.
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