Question about Dremel Drills
Charger no output. no green led. transformer ok and rectified voltage present. power output transistor tested ok. ? 8 pin dil failure?? What is this surface mount component. (details obscured by protective secondary applied film)
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Posted on Jan 02, 2017
SOURCE: NAD C370 in protection mode
With closed eyes -replace all capacitors on protection PCB
All of those caps are overheated and dry out (they lost there capacidance).Note that capacidance meter will not help you at all.
Now unit will work.
Check four big filter capacitors in the middle of unit!!!!
If they are white (NAD 10000uF/80V) DO NOT USE UNIT AT ALL!!!!
Posted on Feb 13, 2008
SOURCE: no output from power supply
I am assuming that you are very familiar with electronic circuitry and components, use of a DVM and a soldering iron. In the absence of a schematic diagram, and since you have perform initial voltage checks, perhaps you can wing it. Your "brick" will have to follow the basic design of an SMPS (switch mode power supply). Simply stated,an SMPS is an AC to DC to high freq AC then to lo V DC converter. Per your post, you have checked that there is DC (B+) from the AC mains, then what is needed is to check if there is oscillation to produce the high freq AC. Often design calls for an optical coupler, a small rectangular looking component with four pins, two at each end. This is nothing more than a LED and a Light Dependent transistor. Its function is to switch/trigger on the oscillation (and therefore start the SMPS producing the lo B+s).
Again, since there is no readily available schematic diagram, might I suggest that you post back the part numbers of the ICs and transistors. What we can do is pull out their spec/data sheets and/or application diagrams. Such would give us a general idea of the working voltages at what pins and what each component is supposed to do. Example, let us say your power supply uses a 817A/0635 opti coupler and/or an SG5841DZ controller IC, then we can search for them as initially described.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Posted on Sep 30, 2008
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