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Recent content by whitspirit

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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. I don´t know if this will help, but in my search of solution for reparing the tenma escope i find a nice guy named "JAMES" with similar problem in focus adjustmemt...this his the email: " I did manage to fix my focus problem by persistance. There was a 2.2 meg ohm resisitor on the crt...
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. I have short it out the pins 2&3 on CRT and nothing happen, no signs of Tension, when i measued the C605 finally i found something wrong, theres a short circuit!!!!, and the C605 is the bad boy... Thanks for all,without you guys I had not got there... Your the best:-P
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. The 12v and 75v are connected to the top side of R618 on board. How can i check if -1,9kv are prensent in J603-3 ?I have no HV probe...there same way to make that? Are you sure that i can quickly short out pin 2 and 3 in CRT with all connectors on, and don´t burn anything or make lot´s...
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. All tensions in power supply are correct , But in diagram of H.V Z-AMP found strange values like: -In R630(22K) a read 121,9v but supposed to be 12v.But in Dc restorer general theory shows 100v same place.confused?? -In spot R610(100k)+R611(10k) it shows 121.9v supposed to be 75v. -In...
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. GOOD WORK. You managed to get similar diagrams, I´:smile:am very grateful to you E-design. I will confirm all the voltages and check the blanking circuit , dc restorer and comment soon how it went. ThanksThanksthanks.
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. I will try all tips this weekend, i will let you know how it went... Many..Many.. thanks...
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. Thanks for answering to my call... I have read all that treads and i think my problem is different, theres no noise near the CRT and this is new model with little use. I have look all two boards for suspects components and bad welds...I found nothing, everything looks good.. Please give...
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    [SOLVED] Oscilloscope Tenma 72-6800 no trace

    Hello. I was looking for solution on the net for my analog oscilloscope tenma 72-6800 and i find this post in edaboard.com: "Turn up the intensity on the scope and turn down any graticule lights on the display. Darken the room. Switch on the scope. After about 10sec switch of the scope...
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