Hi All,
A question to CRT circuitry gurus or anyone who might have seen this in the past and somehow got it repaired.
One of my VT320s developed a wobbly display, see video here: Wobbly VT320
The moment I switch it off, when no line AC voltage is present, the wobble disappears and the display stabilizes perfectly before vanishing.
This fault has developed while sitting on the shelf, so my suspicion is a bad electrolytic capacitor somewhere, but I really have no idea.
I have measured the voltages coming out of the power board into the main board (5V, 12V , 18.5V DC), they are all correct and quiet.
Something is likely broken in the horizontal section, perhaps the vertical as well ? I have replaced capacitor C207 (schematic says 6.2uf 35V bipolar, actual part was a 8.2uf 35V bipolar, replaced with a 10uf 35V bipolar) but the issue persists.
Any suggestion as to what is broken (or where to probe) will be greatly appreciated.
Thanks!
-Alon.
A question to CRT circuitry gurus or anyone who might have seen this in the past and somehow got it repaired.
One of my VT320s developed a wobbly display, see video here: Wobbly VT320
The moment I switch it off, when no line AC voltage is present, the wobble disappears and the display stabilizes perfectly before vanishing.
This fault has developed while sitting on the shelf, so my suspicion is a bad electrolytic capacitor somewhere, but I really have no idea.
I have measured the voltages coming out of the power board into the main board (5V, 12V , 18.5V DC), they are all correct and quiet.
Something is likely broken in the horizontal section, perhaps the vertical as well ? I have replaced capacitor C207 (schematic says 6.2uf 35V bipolar, actual part was a 8.2uf 35V bipolar, replaced with a 10uf 35V bipolar) but the issue persists.
Any suggestion as to what is broken (or where to probe) will be greatly appreciated.
Thanks!
-Alon.