| Electronics > Repair |
| BK Precision 2120 trace issues |
| << < (12/36) > >> |
| vexatag:
Oh, forgot to mention that I have some MPSA13 transistors from an impulse addition to an ebay purchase. |
| bdunham7:
So here's a simple test you can try since you have two multimeters now. Put the first DMM back on the measurement between R834 and chassis ground. Now go into XY mode and hook up that BNC-to-clips adapter I saw on the CH1/Y input. Use the diode check or ohms function--it will generate a small voltage--and input it into the scope via the clips. You will have to turn the V/DIV setting down on that channel to 1V/DIV or less--do that until the dot moves about halfway (up and down) across the screen. You may have to reverse polarity to get it to go the right way. Once that works, move the BNC connection to the CH2/X input and set the V/DIV to the same setting as you just arrive at for CH1/Y. Now repeatedly connect and disconnect the signal-producing DMM (presumably then new one) and observe if there is any change on the other meter that is hooked up to R834. Turn the range down one step at a time until you see some change--it should be clearly evident. |
| vexatag:
On CH1, I read ~1.558 V when the test load was connected and ~1.553 V when the test load was disconnected. On CH2 I read -4.34 V when the test load was connected and 1.45 V when the test load was disconnected. |
| bdunham7:
OK, does the dot move when you are connected to CH1/Y? |
| vexatag:
I can get the dot to form a vertical line, yeah. |
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