| Electronics > Repair |
| BK Precision 2120 trace issues |
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| vexatag:
R834 measured 68.4 ohms. Unplugging PG106 leaves no dot on the screen. As for other equipment, I have some 100k pots, a 10k pot, a custom 16k pot, assorted capacitors, a Velleman MK 105 1khz signal generator, the ability to use my computer's soundcard or a usb soundcard as a somewhat limited scope (the wiring setup is admittedly janky and I don't want to risk super high voltage through it), a small breadboard, wire, solder, a soldering iron, and two multimeters (the DM 383 and a recently arrived AN860B+). |
| bdunham7:
OK, let's not burn up your computer just yet, there's enough useful stuff that looks helpful. I'll try to think of a way to make it all work. In the meantime, no dot with the connector unplugged seriously worries me, although I'm very unsure what to think at this point--it's bit of uncharted territory for me to. What I was expecting was that the beam would just continue right down the center without being deflected. You said there were other wires on PG106, can you tell where they go to? |
| vexatag:
All four wires on PG106 go to the base (I believe that's what it's called) on the back of the CRT. Re-testing, I saw a square faintly illuminate and quickly drift to the lower left corner while growing in size. |
| bdunham7:
OK, I see that the other two are the FOCUS (orange) and ASTIGMATISM (black). Be careful, theres about -2000 volts on the focus wire (but not much current). That's why you need a few minutes of power off before handling anything. Is there any practical way to disconnect just the two tan wires? I don't know what the connector looks like. |
| vexatag:
I believe it's a JST connector? |
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