Electronics > Repair
HP54600B with spike problem with and without signal
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iMo:
As written above - try to cool down the chips, go chip by chip (start with the U33), perhaps you will be lucky.
Perhaps a single drop of IPA (isopropylalcohol) on the chip will be enough, it cools it down a little bit.
xavier60:
Or preheat something before the DSO switched on.
MathWizard:
The PCB looks pretty cool, it reminds me how small the circuits I work on have been.
sacha:
Hello everyone, Today I cooled the parts and I realized that if I cool U25 or U33 together or one at a time the spikes come back, it seems strange to me that both are defective. and if when they are hot and the spikes have disappeared I turn off the oscilloscope and turn it back on immediately the spikes return as if the integrated circuits were cold. If when the spikes are present I connect the oscilloscope probe (x10) to pin 20 of U33 the spikes disappear.
Runco990:
 If there is NO ripple on the power rails and all voltages are in spec, I'd change that IC, as it is pretty simple and RAM does go bad.
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