Q: Noisy audio from 3400c
Hello,
I just acquired a nice PowerBook 3400c. Everything works as expected, but the one thing nagging me is that the audio out circuit is rather noisy. There is whitenoise that is proportional to the system volume level, and there's quiet but noticable high-pitched interference that seems to correlate to the HDD seeking/writing.
This persists via both headphones and speakers. It persists when running just on battery, just on AC, and on both battery and AC connected, so does not change based on how the unit is getting power.
Anyone have experience troubleshooting/fixing this? This doens't sound like expected behavior, so I'm assuming that the age of this thing is the contributor. I haven't torn it apart for this specific issue, maybe there's a few capacitors I can change out?
I just acquired a nice PowerBook 3400c. Everything works as expected, but the one thing nagging me is that the audio out circuit is rather noisy. There is whitenoise that is proportional to the system volume level, and there's quiet but noticable high-pitched interference that seems to correlate to the HDD seeking/writing.
This persists via both headphones and speakers. It persists when running just on battery, just on AC, and on both battery and AC connected, so does not change based on how the unit is getting power.
Anyone have experience troubleshooting/fixing this? This doens't sound like expected behavior, so I'm assuming that the age of this thing is the contributor. I haven't torn it apart for this specific issue, maybe there's a few capacitors I can change out?
PowerBook 3400c, Mac OS 9.1.x
Posted on Dec 15, 2009 2:38 PM