Nahash5150 10,955 Posted February 1 Posted February 1 Tearing it down: And of course it has a blown channel...it's rare to work on a CG and it NOT have a blown channel. 2 1 2
Community Admin AndrewJohn 10,805 Posted February 1 Community Admin Posted February 1 15 minutes ago, Nahash5150 said: it's rare to work on a CG and it NOT have a blown channel. just curious, is there a typical reason for this common failure? Any prevention possible? Or does it fall into the two buckets of a) user abuse and/or b) aging or low-quality original components? Thanks for sharing this project. Looking forward to watching the whole thing! 2
Nahash5150 10,955 Posted February 2 Author Posted February 2 19 hours ago, AndrewJohn said: just curious, is there a typical reason for this common failure? Any prevention possible? Or does it fall into the two buckets of a) user abuse and/or b) aging or low-quality original components? Thanks for sharing this project. Looking forward to watching the whole thing! Not really typical. They fail as a result of a few things like a failed TDC, bad regulation (bad caps), cracked solder joints, abuse, etc. The problem is that Sunfires don't shut down from a fault - they just mute. So power stays active during a failure until it becomes a light show. The fuses rarely save the day...they only prevent complete meltdown (hopefully). 2 1
Nahash5150 10,955 Posted February 7 Author Posted February 7 Bad bad bad! Thankfully, only a fuse and a pair if output transistors are bad. I replaced the whole stage though. All back together! New meter bulb and meter check, the cover is back on, and now a bit of faceplate cleanup Before: After: 1
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