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Telequipment scopes
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Red Tomato
Hi there,
This might be a bit offtopic since I'm bringing Telequipment scopes to discussion. But then again Telequipment was bought by Tektronix in the late 60's I think, so I hope all is well :-) As I said I own two Telequipment scopes (bought them for 30 pounds), models D43 and DM53A with the following problems: a)D43: Although I have both beams on the crt and the timebase seems to be working ok, I have neither focus nor any signal at all (ie just two thick straight beams); b)Lots of trigger misfires. The signal "wanders" across the crt window. Trigger level looks ok though. Timebase looks ok; Can you guys advise me on what to do or where to start? Both crt's look ok (no burnt spots, etc) - I'm sure we're talking about minor stuff here. Both scopes seem to be built like a tank - the quality of wiring is superb - and there's life in them - it would be a shame to scrap them just like that. Thanks in advance for all your comments/suggestions/tips Best Regards Fernando Fonseca Portsmouth, UK. ---------------------------------------- John Lennon's dead. Phil Collins alive?! ---------------------------------------- ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at or your free @yahoo.ie address at |
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Don Black
Hi Fernando,
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Check the power supplies in the D43. It sounds like something common to both the deflection circuits and beam voltages. It seems the horizontal circuits are working (assuming you're seeing straight horizontal lines). It could also be a vertical amplifier problem, not passing a signal but either having hum signal or oscillation causing the line to thicken. Try different sweep speeds to see if it's some signal causing the line to thicken. The DM53A must have a problem in the trigger circuit. Have you tried an external trigger to see if it's lack of internal trigger signal? It must be getting lost somewhere there. Don Black. Red Tomato wrote: Hi there, |
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