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| TEKTRONIX 7904 BROKEN-DOWN |
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| jonpaul:
cold start OK, hot de focused....usually failing HV resistance, transformers or multiplier j |
| james_s:
A can of freeze spray (or air duster held upside down) works wonders for tracking down these kind of thermally sensitive intermittent issues. Let it warm up until the problem occurs, then start giving different areas a quick burst of cold spray until you find the spot that affects the symptoms. |
| jonpaul:
Freez mist may NOT be used on the HV section as the condensed humidity can short things out j |
| Jose:
This morning, I turned on the 7904 and still the same failure I turned it off and on again two hours later and it works. I gently moved the vertical amplifier board hitting the U745 the problem appeared and disappeared What do you think? |
| Jose:
look at the picture |
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