| Electronics > Repair |
| Calibrating and repairing a function generator versus safety |
| << < (4/4) |
| McMonster:
I absolutely agree. Though there's one more ugly thing with this kind of construction, mutiple schematics covering multiple boards, so you can see one schematic showing parts from three boards and vice versa. Add multiple offboard power signals and a headache guaranteed. Sometimes the signals are hard to trace over this mess, but most of the time they do a good job with labeling and marking board boundaries. |
| McMonster:
I think I've found it after halfway disassembling of the generator. It's is in fact a classic short on the motherboard. I have 4 suspicious 220 uF 16 V electrolytics between +5V and GND rails reading stable 6 ohms in both directions between them. I'd apreciate if someone could confirm if this sounds valid. After this the daunting task of disassembling the generator almost completely to lift the caps and check them... The trick was that they were hard to notice under the daughter boards (axial leads) and the motherboard does not have a full schematic (too complex) but just the signal listing for the slots and a note indicating the existence of those caps. I simply didn't expect so plain and boring board to have a faulty component. I've watched Daves latest video just a few hours ago. Murphy would surely laugh at me. I did. :D |
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