| Electronics > Repair |
| BK Precision 2120 trace issues |
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| bdunham7:
OK, the TIM/DIV center knob turns instead of pushing, no big deal. If you change the V/DIV one click each way does that 8mm become 4 mm one way and 15 the other (or something like that--precision is unimportant). And then, if you change the SOURCE to EXT, pull the TRIG LVL out and center it--do the does stay or go away? |
| vexatag:
--- Quote from: bdunham7 on July 23, 2020, 11:00:19 pm ---If you change the V/DIV one click each way does that 8mm become 4 mm one way and 15 the other (or something like that--precision is unimportant). --- End quote --- Changing to 1 v/div halves the distance, 0.2 v/div roughly doubles it. --- Quote from: bdunham7 on July 23, 2020, 11:00:19 pm ---And then, if you change the SOURCE to EXT, pull the TRIG LVL out and center it--do the does stay or go away? --- End quote --- This makes absolutely zero difference. |
| bdunham7:
I'm out of ideas for the moment, but don't throw it out the window yet. Test the rest of the resistors in the horizontal final amp and maybe give it a break for a day or two... One more thing--is the dot in the same area that is was before you replaced the defective resistors? |
| vexatag:
--- Quote from: bdunham7 on July 23, 2020, 11:08:18 pm ---One more thing--is the dot in the same area that is was before you replaced the defective resistors? --- End quote --- No, when I first got the scope the dot's position was strongly on the left, the x-pos knob moved the dot from the left (off screen) to a little over 1 cm away from the center. Now the entire range of the x-pos knob is within 1 cm to the left of the center line (the entire range fits inside one measured box) but it's much closer at the closest setting. I'll check the rest of the resistors and report back. |
| vexatag:
Checked the remaining resistors in the horizontal amp, here are the ones that were out of spec enough for me to notice: * R823: 1.58k * R825: 86.k * R827: 9.2k * R831: 4.57k * R840: 1.55k |
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