Tuner and IF we're badly damaged from water intrusion. Restored chassis best possible and installed direct composite audio/video RCA inputs. Added an lm386 preamp to boost the audio signal. wanted at least about .7v worth of audio at the grid
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https://www.youtube.com/watch?v=GOW9Bj9kBMM
This time its mario who is taking revenge on DK. He has him hostage and you (his son Jr.) have to rescue DK from Mario. Controls and physics are terrible on thie game compared to others. Not Nintendo's shining hour. Who knows, the original arcade could have been fine and the port to the NES could have just sucked.
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https://www.youtube.com/watch?v=nOjzzQacCH8
Some principals of servicing can be transferred to a 939 or sx-1010. However, this shows the primary weakness of the series: push-button switches. Ultimately the cure is to hit them with deoxit D-5, then S5 (shield)
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https://www.youtube.com/watch?v=qbRZQXsfaEM
Refoaming for the 1st time? This will show how to refoam a woofer that has a large gap and doesn't require shims or a regulated supply
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https://www.youtube.com/watch?v=ZKYg6NO5DgU
Appears to have been cared for by its previous owner. However, lets check it out and see what further things we can do to make it run happy. Crumbling yoke disease.
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https://www.youtube.com/watch?v=fvEF2JG_zIc