| Electronics > Repair |
| TDS3014 adventures |
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| Galen:
--- Quote from: madao on June 19, 2020, 05:53:02 pm ---spare parts TDS3012 is arrivied for repair of gosif's TDS3014B and my TDS3014. Sad, only PSU is dead, it runs good with external 15V . SPC passed. I make think about it... greetings matt --- End quote --- For the PSU, 3 resisters are very high temperature,especially the 2 serial connected near the transfomer at the board edge. Does one of them open circuit? |
| Galen:
I added a heat sink to the two resisters. circled the 3 resisters in below picture. |
| madao:
your PSU look bit other than my PSU. But your tip is good. Not big resistor in Pictures, small brigded two resistor is open. (2x 390 kohm series, your have probably one 820k, near primary eletrolytics, hidden by blue ceramic capacitor) PSU lives again. Thanks. Next step: desolder NVSRAM, battery is empty. Greetings matt |
| giosif:
Was looking inside the scope again this morning and noticed something I hadn't before: is it just me or the flex cable going from the Ethernet board to the main board is awfully close to those two resistors that are known to get toasty when the scope if turned off (see pictures)? Now, I have done a continuity check on that flex cable as part of my initial troubleshooting, and all checked ok then, but that was with the cable outside the scope, sitting on a flat surface. I wonder... |
| Galen:
giosif, not only you. I got 3 TDS3000B recently, the flex cable are all like that. I have to bend this cable to make a little space from the 2 hot resisters. For the Ethernet, both my two 3000B fail to connect with computer, even I use cross over cable and fix ip at both end. strange. I have no clue. waiting for your finding. |
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