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| Lecroy Wavemaster 8300A repair. |
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| hpw:
About the LED. May clean the front panel from any dust (not an easy mechanical task as to remove the fan's). May exchange the 24 step encoders as time base is the often culprit as jumping steps. The no dedent models (for fine tuning) no any longer on sky (Bourns without any notch), only detent models order able |
| nctnico:
You can try to reseat (disconnect/connect) the attenuators. Unfortunately these are not easy to take out. Reseating worked for me. If the mechanical part is the same as the 7000 series, make sure the standoff under the attenuator doesn't get undone when trying to undo the screws of the attenuators. Otherwise the whole assembly gets pushed up. |
| djsb:
How can I tell if there is damage to the rotary attenuator pots/encoders (they have a distinct step when they are rotated)or if the there is damage to the input stages of the Y amplifiers themselves? It's strange that on all 3 channels (1,2 and 3) the trace disappears on ALL volts per division settings over 2 volts. I could try to remove reseat any connectors on the assembly that holds the rotary encoders behind the front panel. |
| hpw:
--- Quote from: djsb on November 30, 2023, 09:24:48 am ---How can I tell if there is damage to the rotary attenuator pots/encoders (they have a distinct step when they are rotated)or if the there is damage to the input stages of the Y amplifiers themselves? It's strange that on all 3 channels (1,2 and 3) the trace disappears on ALL volts per division settings over 2 volts. I could try to remove reseat any connectors on the assembly that holds the rotary encoders behind the front panel. --- End quote --- Rotary Encoders: just smoothly turn any decoder as with 24 steps. If you get a a missing or larger unexpected steps, then it is likely the encoder or the cause of black dust. Even the none detent models, follow a digital step inc/dec. As LED's completely off, black dust as hell on the mentioned panel. I simple reduced the fan ALU holder, so remove and mounting gets smoother, but the damping foam have to be replaced. Anyway if you go for any smoother fan's or using 14cm fans with required 12 to 14 cm adapter (3D print) In addition if you use an XP with a dual CPU (3GHz Models), a special masking driver is required otherwise LED flashing will occur. I could not go further than XP, otherwise XStream or Touch driver gets any wired. Also 3V battery to replace as stops the main board on boot. Happy tuning :clap: |
| nctnico:
--- Quote from: djsb on November 30, 2023, 09:24:48 am ---How can I tell if there is damage to the rotary attenuator pots/encoders (they have a distinct step when they are rotated)or if the there is damage to the input stages of the Y amplifiers themselves? It's strange that on all 3 channels (1,2 and 3) the trace disappears on ALL volts per division settings over 2 volts. I could try to remove reseat any connectors on the assembly that holds the rotary encoders behind the front panel. --- End quote --- You can set the channel parameters like offset, range and so on manually as well IIRC through the user interface. So try this first. Not saying the front panel is without potential issues though but save that for later. |
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