I would suggest vacuuming as much as possible before even pulling the boards -- especially the deteriorating foam... try to orient the box such that any foam which breaks off while you're doing this doesn't fall into the backplane... Once the boards are out, then vacuum directly over the slots, spending lots of time, and make sure you have good suction. [... section on cleaning PSU removed ...] Sounds sound... Vacuum the boards (and/or blow them off with the dust-off... I'll admit to being leary of putting boards in the dishwasher the way Allison does, but it works for her, and she definitely knows more than I about the electronics... so ... Sounds good.. One problem is that you have to keep in mind the slots which might need the CA1-CB1 jumper installed if you don't have boards in it... otherwise you may get bus errors... I would also think about a PSU power-on test with no backplanes attached, then with backplanes attached, then with Unibus jumpers, etc... I don't know if the PSU can handle a no-load condition, though -- Allison, Tony or Tim.S might be able to answer that better. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+