Metcal MX5000 repair

[oliver602]

Just payed over the odds for a broken Metcal MX5000 (silly me). Powers up, detects whether or not a handpiece is connected with tip, but doesn't warm up. Just shows 'Ready'. Looked inside and someone has replaced a LM2576 which made fire judging by the adjacent burn marks on the inside of the enclosure.

Anybody got storys, tips or advice? Or a proper manual would be very handy(I see a calibration menu)? My google skills really don't seam up to the task. I've only been able to find a very basic manual. I can't even find teardown photos to compare.

Oliver

[mikeselectricstuff]

I think the circuitry isn't too different to the 500, for which there is a schematic available.

[quarros]

Here is a link to the schematic: http://www.mikrocontroller.net/attachment/193474/MX-500P-11.pdf

[Metcalman]

Contact Technical Support 714 799 9910, it may still be under the 5 year warranty.

[oliver602]

Thanks for the info.

Maybe someone else will have luck fixing it or of interest to someone experimenting with DIY Metcal supplys. I've listed it on ebay UK http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=251593198053. My electronics knowledge is too primitive. I haven't changed any components, evidence someone else tried before me.

2 boards in this MX5000, main power supply (24V and 48V out if I remember) shows good voltages on a DMM. Second board with MCU and display shows damage around a switching regulator. The MX5000 was showing steady 13.56Mhz on the selected hand piece output with iron attached till the switching regulater literally exploded like a gun shot. Output was unstable after that. Photos on ebay listing.

Thanks