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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