Electronics > Repair

Metcal PS-900 Soldering station heats up to over 400 °C

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nemail2:

--- Quote from: Rasz on November 20, 2018, 05:42:33 pm ---Afaik that wasnt the heater, its an induction coil. Heater aka element actually producing heat is just a cylinder shaped piece of metal inside the tip itself.

--- End quote ---

ok now we're talking. that now depends on how you define heater. for me it was the peace which consumes energy to make something hot. as it is induction, for me it was the induction coil in the handpiece. the metal in the tip is picking up the induction and heats up, just like a pot on an induction stove. At least that's how I understood it.

Anyway, these are pics of the PS-900 board:
https://owncloud.ne-mail.net/s/WpLaspzrHWpPifY/download?path=%2F&files=20181121_224302.jpg
https://owncloud.ne-mail.net/s/WpLaspzrHWpPifY/download?path=%2F&files=20181121_224359.jpg
https://owncloud.ne-mail.net/s/WpLaspzrHWpPifY/download?path=%2F&files=20181121_224414.jpg

Rasz:
the coil is just an antenna, it shouldnt be getting hot. Tip cant get as hot as you report, suggests your unit is sending DC to the coil and burning it

nemail2:

--- Quote from: Rasz on November 22, 2018, 03:31:35 am ---the coil is just an antenna, it shouldnt be getting hot. Tip cant get as hot as you report, suggests your unit is sending DC to the coil and burning it

--- End quote ---
ok and now i understand what you were saying, sorry for the confusion :-)
yes, the coil should not get hot. not entirely sure how the tip is constructed, in theory where it gets hot (near the coil) could be a piece of metal which is picking up the induction as well so it MAY be that it isn't the coil itself which is heating up but as well it may be possible that it is like you are saying.

The tip itself (not only the shaft where the coil sits) is getting (reasonably fast) ridiculously hot  as well, I measured 470 °C yesterday, so obviously the HEATING works  :-DD don't know if that would work if the coil is being fed with DC.

suggestions what part to replace next to give it another shot?

bd139:
Good point with the DC to the coil. If it’s passing DC I wonder if a cap has gone short on the board. I’d have a poke around with DMM.

nemail2:

--- Quote from: bd139 on November 22, 2018, 07:55:23 am ---Good point with the DC to the coil. If it’s passing DC I wonder if a cap has gone short on the board. I’d have a poke around with DMM.

--- End quote ---
how'd you measure that without desoldering, if there are more caps on a rail it'd be any cap - without desoldering you'd never know or am i missing something?
would be glad if I hadn't to desolder every cap :-)

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