Krups xp9000 exploded diagram
The logic board is confused by the on/off state of the micro switcheson the cam wheel on the motor assembly. the micro switches are a very ordinary type, the particular part number specifies force details and other particulars not needed, and only the Normally open contacts are actually used. Just choose one from the same size series with the correct size faston tabs for your unit. Some units were made using 1/4" and others using 3/16". Gold contacts are nice, but the units are now over 10 years old and unlikely to last long enough to fail from contact corrosion no matter which is chosen. A thin residue of food safe silicone grease on the cam wheel will keep the switch actuator from wearing down, a more common cause of switch failure than the contact itself. if the cam wheel and switches are all good there's a second problem that appears as the units get old.
The motor is powered through Relay 1&2 at the top left of the power board. The relay coil current passes through a pair of contacts on the drip tray tab closes to the plastic extension that operates a micro switch, the other drip tray contact is used to sense liquid. The logic board uses the micro switch to sense drip tray present/absent. The use of 2 contacts on one tab blocks brew unit motor relay drive current when the drip tray is not present .That function is not needed because the logic board senses tray present/absent using the switch and doesn't drive the relays to power the motor if it is absent. When the contacts are slightly dirty, orders of magnitude less resistance than drip tray liquid, the relay drive current becomes insufficient. The contacts can be cleaned on the *under* side of the drip tray and the contact support tray. The contact support tray is retained by tabs at the rear sides. Press them inward to withdraw the contact support tray. The two contacts on the one tab can be interconnected to prevent the superfluous and unreliable interconnect from impairing the relay drive current.
Its also possible but less likely that the transformer 15v or 9v AC secondary has failed or the full wave diode bridges formed by D1-D4 and/or D5-D8 have a bad diode, the relay coil turn-off reverse voltage snubber diodes D9 & D10 could have failed, or the zener diode at the the top/left of the board failed. The relays themselves are a very reliable Panasonic type but no longer made, if one has failed there are equivalents available, but these are not the 1st thing to investigate.
The Logic board that drives the relays is not available as a replacement part. If the PIC controller output is not driving the relays it would be necessary to download the PIC's ROM and program a replacement before installing it. Most DIY repair people will require professional assistance to do that. The 5 pin diagnostic connector under the plug mark graphically as no-touch is connected to the JTAG scan port that would be used to do that. search google for a Jura series 3 micro schematic for details.
All of these super automatic coffee makers are actually made by one, and only one, Swiss company. Different marketing brands select features and customize the styling of the current version of the coffee maker engine. The reviews that compare the resulting coffee and find significant differences are at best examples of "confirmation bias", and at worst influenced by incentives provided by brand that was preferred.
That said, the power board and logic board found in the Krups XP9000 is a different shape from that used in any other brand based on the same revision of the main design. The interchangeability of the components is very useful for the components found in the brewing path, of limited use for anything that was customized for Krups like the drip tray and water tank for which other OEMs have slightly different versions that can be adapted by an adept craftsman, and of no use for components totally unique to the Krups XP9000, like the outer case. When an MS-XXXXX p/n is unavailable, look at the parts for other 2007 models. A drip tray with the tabs and switch finger on the left instead of the right or a coffee grinder with un-needed parts for example. A razor saw and glue will alter a drip tray. A grinder with unneeded parts can be simplified.
