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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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#1
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Schematic wanted: Crest ultrasonic cleaner
Crest model 4G-250-3, early 90's vintage.
Part numbers have been sanded off all ICs. It would be great to find a schematic... Thanks. |
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#2
Posted to sci.electronics.misc,sci.electronics.repair
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Schematic wanted: Crest ultrasonic cleaner
On 28/05/2014 21:54, Gary Walters wrote:
Crest model 4G-250-3, early 90's vintage. Part numbers have been sanded off all ICs. It would be great to find a schematic... Thanks. So they will not have released a schematic. Perhaps Google/Images with something like "ultrasonic cleaner" pcb and maybe find something rebadged, with extant markings. As the power side of UCs seems to be unsually IC free, even more likely in 1990s, any ICs would probably be just for timing and control, so isolatable if lucky |
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#3
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Schematic wanted: Crest ultrasonic cleaner
Plus side of IC grinding is that they probably used industry standard
CMOS/555/etc rather than ASICs/PICs and similar that would need no sanding off |
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#4
Posted to sci.electronics.misc,sci.electronics.repair
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Schematic wanted: Crest ultrasonic cleaner
Plus side of IC grinding is that they probably used industry standard
CMOS/555/etc rather than ASICs/PICs and similar that would need no sanding off The DIP-8 I'm focusing on right now looks like it might be a standard dual op-amp. Analyzing the circuit to see if there's anything special that the op-amp needs to handle... |
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