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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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Brother MFC-420CN - dead
An older gentleman in our church had this multi-function printer and I
told him I would look at it for him. The main symptom is that the unit is dead, as in push the little power button and nothing happens. My first thought was the power supply died, but it appears to be a very simple unit and putting out 31 vdc. I looked at the main board under the microscope and didn't see anything unusual. I checked esr on the electrolytic caps and did find the small ones like 100mf @ 10v varying quite a bit from cap to cap. Since this printer is only a couple years old and not used much, it seemed unlikey that the caps would already dry out enough to kill the machine, even though I got varied readings. No signs of cap leakage. Does anyone have any info on this machine? Has anyone run into this already? An internet search didn't come up with anything that helped. Thoughts? Thanks. WT |
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