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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Posted to alt.binaries.schematics.electronic,sci.electronics.design,sci.electronics.repair
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Cleaning Scanner Glass (Inside) hp3970
[sci.electronics.repair added]
On Wed, 30 May 2007 18:44:45 -0700, Jim Thompson wrote: Anyone know how to dismantle and clean an hp3970? I've developed a foggy looking coating on the _inside_ :-( Never worked on HP scanners, but I've fixed Canons & various other brands plenty of times, & the usual steps to dissasemble go something like this: * Hold lid by sides & lift until the supports pop out of the slots. * Look for a retaining strip in the area that was covered by the hinge of the lid. * If present, unscrew / unclip to reveal one end of the glass lid. CAREFULLY lift open end above case & slide out. * Goto: CLEANING. * Otherwise, place scanner upside down on SOFT SURFACE, grab a torch, & look under unit for round screw slots or square/rectangular retaining-clip slots. Remove screws or 'pop' clips with long, flatblade screwdriver. * If it uses clips, it's usually neccessary to apply a little tension between the halves of the shell while 'popping' the clips/hooks to keep them released. I use tongue-depressers or similar to keep the halves from 'clicking' back together while I'm doing the other clips. When the case is split, it should be easy to figure out how the cover glass is being retained. Wearing clean gloves, remove glass *CAREFULLY*. CLEANING: * Put on a pair of lint-free white cotton gloves, or a pair of clean rubber gloves. * Place glass on clean towel, folded several times. * Spray Windex or similar ammonia-based glass cleaner on a clean lens cloth or similar soft, *lint-free* cloth. * Clean top side with damp cloth, dry with a *different* cloth. * Flip glass, touching only the sides. * Clean this side, as above. * Slide glass slowly & carefully back into the case, in exactly the reverse of the way you removed it. With some cases, it can be useful to tie a ribbon or similar around the glass first, so you can support it with your other hand, so it can't fall inside the case if you slip, etc. Using your gloved finger, make sure the glass is seated solidly, & flat, as it's not always obvious, & a bad fit will give you poorly focussed/blurred scans. * Without removing your gloves, reassemble the unit. * Test. (Duh.) -- W "Some people are alive only because it is illegal to kill them." . | ,. w , \|/ \|/ Perna condita delenda est ---^----^--------------------------------------------------------------- |
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