Picked up a Tek 2445 with a few problems, maybe someone can provide some guidance.
When I first turned it on, the display and alpha-numeric readout was barely readable and it gave an error message (did not write to down). The readout quickly descended into a jumble of unreadable and shaky blur. The trace was not straight, sort of 45-degrees slanted, barely visible, and the focus did not appear to do much.
I tore into the unit, and found 2 blown caps on the inverter board (180uf @ 40v). I replaced those and a few around them.
After reassembly and adjusting the astigmatism control, the readout was very readable for a brief time, maybe 15 seconds but then it collapsed into a similar jumble of mush again, although the focusing is quite good now -- while the readout is a jumble, you can tell that it is focused. The trace is also straight now, but not as crisp as a Tek should be.
Playing with the "Readout Intensity" control seems to make the readout go all goofy, more or less randomly shaking up the jumble on the screen. Also, the astigmatism control seems to affect it also.
Photo of symptoms:
http://s127424922.onlinehome.us/2445-1.jpg
Photo of caps that I replaced:
http://s127424922.onlinehome.us/2445-2.jpg
Assistance would be welcome. No need to make disclaimers about high voltage or whatever, I understand....
Thanks in advance for your guidance.
bobby
UPDATE:
Fired it up today, after sitting overnight:
http://s127424922.onlinehome.us/2445-3.jpg
BUT -- that lasted about 1 minute or so before collapsing into the jumble of blur.
And I also discovered that in Delay mode the readout stays readable (been solid for last 30 minutes):
http://s127424922.onlinehome.us/2445-4.jpg
When I first turned it on, the display and alpha-numeric readout was barely readable and it gave an error message (did not write to down). The readout quickly descended into a jumble of unreadable and shaky blur. The trace was not straight, sort of 45-degrees slanted, barely visible, and the focus did not appear to do much.
I tore into the unit, and found 2 blown caps on the inverter board (180uf @ 40v). I replaced those and a few around them.
After reassembly and adjusting the astigmatism control, the readout was very readable for a brief time, maybe 15 seconds but then it collapsed into a similar jumble of mush again, although the focusing is quite good now -- while the readout is a jumble, you can tell that it is focused. The trace is also straight now, but not as crisp as a Tek should be.
Playing with the "Readout Intensity" control seems to make the readout go all goofy, more or less randomly shaking up the jumble on the screen. Also, the astigmatism control seems to affect it also.
Photo of symptoms:
http://s127424922.onlinehome.us/2445-1.jpg
Photo of caps that I replaced:
http://s127424922.onlinehome.us/2445-2.jpg
Assistance would be welcome. No need to make disclaimers about high voltage or whatever, I understand....
Thanks in advance for your guidance.
bobby
UPDATE:
Fired it up today, after sitting overnight:
http://s127424922.onlinehome.us/2445-3.jpg
BUT -- that lasted about 1 minute or so before collapsing into the jumble of blur.
And I also discovered that in Delay mode the readout stays readable (been solid for last 30 minutes):
http://s127424922.onlinehome.us/2445-4.jpg
Last edited:
