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Quoted from zaza:The Connector on J15 received 12V with reversed polarity. Don't know if it blew something.
If I read the schematic it looks like it's ok. 2J2, 2J15 and 2J16 are all connected and as long as the power source (from 3J3) is not connected it won't matter. The Diner manual shows that all three of these connectors are used.
12v.jpgQuoted from zaza:J2 is 180º rotated relative to J15 and J16.
Seen by the silkscreen, +12V should be left and GND on the right side. This means that the connector on J16 (in the picture post#12) is the one that comes from the powerboard and carries the power and must go to J2 !
And the connector on J15 (correct gry-yel on left side) is now receiving 12V with reversed polarity.
If something on this powerline has a pcb with polarity sensitive electronics ( steppermotor driver in backbox ?) it could have caused to blow the fuse on the powersupplyboard for the 12V,......this is also where the +5V is derived from.
Ah. I see now. I don't think I've ever put in a plug the wrong way as the locking (friction) ramp and pin distance pretty much makes it impossible to do that. Keying almost always makes it impossible too but it appears that Williams keyed the center pin and unfortunately it's symmetrical which means you can insert the plug the wrong way around.
It looks like 2J15 is correctly oriented but 2J16 is incorrectly oriented.
I can stand corrected.
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