Do It Yourself Musician #36 Tascam 122 MkIII Repair Part 2 Transport Gears

Comments · 58

• JE

  @jeremyarnold2968 · 1 year ago

  Killer channel man! All kinds of videos on stuff I like. Thanks for not dragging ass, having a "TV show" intro and for not playing annoying music in the background. Cheers!

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• MR

  @MrAtomichunter · 5 years ago (edited)

  Thanks for the great video. I acquired a 112 MkII for free and it is in mint condition except for the three flashing lights. I took it apart and sure enough gear C was in two pieces. I Just orderded one on eBay. Took less than 10 min to tear it down!<br>UPDATE: I received the gear in 3 days and installed it per this video and lo and behold I now have a fully functional Tascam 112 mkII. Thank You Thank You!

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• OC

  @Ockhamcool · 3 years ago

  Great video! Demystifies the issues on this common and popular deck. Great work. Very thorough, well shot, well paced and informative. Thank you very much!

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• JE

  @jeffersonoliveiraUSA · 5 years ago

  Hey here is from JPOSOLARSOLUTIONS, Thanks for this video......

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• DI

  @digitalsouthofficial · 2 months ago

  thanks :)

• VI

  @VintageGearMan · 3 years ago

  I have a habit of winning on many different types of repairs thankfully.

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• HE

  @hectormedina7198 · 2 years ago

  An excellent presentation. Thanks for sharing. 😊

• RU

  @RunToRoyal · 4 years ago

  Thank you for the video! Just successfully repaired my unit!! Dreaded gear C!

• DI

  @Disco-Mixologist · 3 years ago

  Once upon a time I created my own gear for a NAK deck. Took imprint of broken gear and filled with JB Weld. Years later sill works 100% with no teeth breaking off.

• TI

  @timf-tinkering · 3 years ago

  Thank you for this excellent series of videos! Very clear, and superbly detailed. I just got my 122 mk III out of storage, to find the transport doesn&apos;t run, so I think I&apos;ll be carrying out these repairs myself very soon!

• OC

  @Ockhamcool · 3 years ago

  I would also add, for other viewers, that these gears appear to be some type of nylon and/or acetal. You mention in the video that you suspect the grease was the culprit. I concur, and would point out that nylon is a material which is very sensitive to certain trace solvents, such as aromatics and halogens found in some lubricating greases and oils. Nylon will SWELL as well as DETERIORATE when exposed to (for example) lubricants which release acids, as well as wet alcohols and even water. I suspect that the relative amount of torque and temperature exerted on gear C, combined with the heating effect of this load at the bearing surface, all contribute to the eventual failure. If one examines the transport, one can see that Gear C runs fastest of all these driven gears - and by a very substantial margin. This means gear C is the &quot;hot&quot; gear, friction-wise. I have microphotographs showing this, including heat discoloration of the grease on gear C shaft. This, as compared to that on gear B shaft. In my photographs, the lubricant on gear C shaft is obviously discolored from excessive heating, while Gear B is perfectly clear and functional. What&apos;s more, the excess lubricant spilled onto the shank of shaft C at unit assembly - lubricant that did NOT run in the gear&apos;s bearing surface and did NOT get hot - is also perfectly clean and clear. It looks and feels as good as the day it was put in there. It is obvious from a stereo microscopic examination of this gear drive that the heat of the faster running gear C makes the lubricant do bad things chemically - things that cause then the nylon to be exposed to something released or changed by the heating of the lubricant. Those are things that the very same lube on gears B and A simply does not evidence. The gear C I examined was also swollen onto the shaft, a classic symptom of acid, halogen, or aliphatic solvent exposure for nylon. Anyway, probably more than anyone wants to know. But just know that lubricants definitely do matter on these nylon, acetal and plastic gears.

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• VA

  @vasiliyonge3131 · 5 years ago

  Super super !

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