Electronics > Repair

HP3458A Repair.

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sprit:

sprit:
On my other 3458, at pin 17 I still get the output although it's a bit noisy. At least I see the waveform I applied. I will try to continue replacing U201, Q202, Q203 to see if there is any progress. Damn, this A3 board is so annoying.

sprit:
Update: After I tried replacing U201, the circuit worked, at least. Now when I press the AC DC button on the front, I hear the Relay beep. The output of DAC U301 has a signal, although the Even though the unclipped waveform isn't what I expected, at least I think I'm on the right track. As for Q202 and Q203, I will try removing it and replacing it to see if the error goes away.

sprit:
Damm, im stucked. The Q202 &Q203 is fine... Now idk whre to digging next zzz

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