Falcon PSU issues

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Altstar
Retro freak
Retro freak
Posts: 15
Joined: Sat Sep 13, 2014 8:18 am
Location: Brisbane

Falcon PSU issues

Post by Altstar »

Hi,

I have a Falcon power supply here that has some issues. Once switched on I can hear a ticking noise. 5V rail is good (measured 5.11V) but the 12V rail delivers only about 7.5V. Replaced all caps (reduced the 5V ripple) but the ticking noise is still there and the 12V rail is still bad. Any suggestions what to change next?

Regards,
Christoph
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frank.lukas
Hardware Guru
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Joined: Tue Jan 29, 2008 5:33 pm
Location: Germany

Re: Falcon PSU issues

Post by frank.lukas »

Maybe replace the diode at the 12Volt line ...
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paul92706
Atari God
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Joined: Mon Apr 25, 2011 4:28 am
Location: Orange, CA

Re: Falcon PSU issues

Post by paul92706 »

I had this almost same problem, my PSU would put out a high pitch ringing, it was a short circuit from Vcc to Gnd near a resistor It took me a while to trace to problem. My Falcon would not power on at all though, maybe yours is different problem. Good luck!
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Altstar
Retro freak
Retro freak
Posts: 15
Joined: Sat Sep 13, 2014 8:18 am
Location: Brisbane

Re: Falcon PSU issues

Post by Altstar »

One of the diodes on the secondary side was shot. Replaced it and the Falcon came back to life! Would now like to put FreeMint onto it :D Are there any tutorials for Atari Falcon noobs available?
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