I was having problems with my 2000 DMU50V with Millplus 4.0. X53, X04, Z04, and other errors related to the E stop chain usually when opening or closing the door. I received some advice from another member and replaced some of the Estop relays in the cabinet and some of the relays on the DDC boards. That helped a bit and I was able to make parts but occasionally still had to stop and restart to keep the machine going. A few weeks ago, the control stopped at boot with an M71 error (no power to PG1220). Tried to restart but the screen was blank, no power on the PG1220. Power supply for the PG1220 was dead. I did see evidence that at some point, the 5 mosfets were replaced along with a few other components. Ive had the machine since 2015 so it was sometime before that.
Power supply is a Philips PE1927/71. Looked on ebay and there were a couple used units in Europe and Indonesia for $1400 or more. I searched around a bit and saw an identical power supply designated as a PE 1927/23B. It was only 69$ so I bought both that the seller had for sale. I looked it over upon arrival with an electrical engineer buddy of mine and he confirmed it was the same except for the voltage input jumper, which was set to 120VAC on the $69 PS. Installed it, checked the voltage outputs on the test points of the PG1220, and so far Ive had no errors at all after making a few parts. Might be helpful to know as it seems like a common problem with these older DMG machines. Im sure it was just the fets that were bad but it worked out in the end.
If anyone has a schematic for these supplies Id like to get a copy. I searched far and wide and didn't see anything online. Philips sold their PS division to Cherokee at some point, and Cherokee merged with another company so its probably all lost.
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