Digest for sci.electronics.repair@googlegroups.com - 3 updates in 3 topics

8:41 AM Penedão
Casey Hernandez Torres <caseyhernandez95@gmail.com>: Mar 04 04:04AM -0800

Solution manual Principles of Environmental Engineering and Science (3rd Ed., Mackenzie Davis & Susan Masten)
 
i need this one!
Thomas Droessler <kdmdisplay@gmail.com>: Mar 03 09:39AM -0800

My existing Fosi volume pot crackling and scratchy:
 If any of your equipment has this problem.There's a wiper in sealed pots
that gets a build-up of oxidation over time. Exorcising it will clean the oxidation off.
0. Turn the amp off.
1. Remove the volume knob .
2. While tapping the top of the unit on a table,
2. Rotate stem  "very " fast 10-15 times.
(use rubber pliers handle against the stem )
Also do the treble, base and other pots.
--- Fixed it perfectly---.
3. Didn't do yet:
    After doing the above.
    Use a clear hose on the stem to seal it.
    Apply 5/6 drops of alcohol into the hose.
    Exorcise the switch.
    Watch the fill line for absorption.
    Keep exorcising 15 times.
    Let the unit set for an hour to dissipate the alcohol.
      
If the volume pot is sealed, it shouldn't have any residue, debris, or oxidization on the resistive element or wiper. If too much power went through the part it might have charred the element and a replacement is in order. Sometimes a DC shift can occur with the adjustment of a control and this can result in a brushing sort of sound which might lead you to believe the control was dirty.
 
 
FOSI huge troubleshooting site:
https://fosiaudioshop.com/pages/faq
John Robertson <jrr@flippers.com>: Mar 03 09:31AM -0800

Has anyone seen a printed/PDF copy of the service manual for the OCE
scanner/printers? Extensive online hunting turns up nothing other than
ads for buying said scanner/printer...(or I missed it!)
 
My machine has darker fainter bands where it prints and I suspect the
corona wires may be part of the problem, but how to clean them? I have
found how to extract the corona wire assembly and tried a basic clean
using a cotton swab with 99% alcohol but that didn't remove some sort of
discolouration on the wires.
 
Then I tried using a fibreglass brush supporting the corona wires with a
stiff piece of paper and that made the printed image slightly darker -
but I don't know if corona wires are coated with anything, or are just
polished spring steel (music) wire.
 
It looks like Canon/OCE is a true believer in keeping service
information forbidden to regular folks who would want to maintain
equipment that they personally own!
 
Where can one file a Right To Repair class action against this sort of
crap? I recall when manufacturers were required BY LAW to provide
schematics and service manuals for equipment they produced. Industrial
secrets is hardly an argument as any manufacturer worth its salt is
working on the next generation of products rather than the ones
currently in or out of production.
 
Thanks for reading!
 
John :-#(#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
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