YAMAHA MT4X | TEAR DOWN

Here is my video tearing down a Yamamha MT4X intended as reference for anyone attempting their own repairs of this model.

Though I have a lot of experience fixing portastudios and the like, in this footage it is my first time completely dissassembling this model, so bear in mind there may be some inefficiencies in the way I dissassemble things.

I comment as I go along on roughly which parts do what, and the sort of things that might go wrong, based on my experiences repairing hundreds of multitrack cassette recorders.

Please use the chapters embedded in the video scroll bar and corrsponding timestamps at the bottom of this description to get a sense of what is covered, and/or jump to the section you need.

I refer to several other videos I ahve made, links to those are below;-

BELT CHANGE
Shown in detail on a Tascam 424 Mk II (it has the same cassette player as the MT4X)
   • Tascam Portastudio 424 Mark II | how ...  0

MIXER CLEANING
Shown in detail on a Tascam 244 (its the same process, no matter which model or manufacturer)
   • Clean & lubricate mixer channels | Ta...  

SPIN WELDING
Demonstrated on a Tascam 414. The sort of thing you might consider if you had broken mounting posts, door hinges or the like.
   • Fix a broken cassette door | Spin Wel...  

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TETRAKAN - Fix & Use Tape Recorders

Overviews; tear-downs; repair vlogs; techniques; tutorials; demo recordings...
...covering every cassette multitrack recorder ever made!*
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I prefer to answer questions in the youtube comments where my answers can help more than one person, but if you need to share photos etc, you can message me via facebook.
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CHAPTERS
0:00 Introduction
1:14 Remove plastic knobs
2:39 Clicking & no tape movement = Bad belts or motor
3:49 Opening the case
4:56 Ribbon cables can be tricky...
5:28 Removing the cassette player
09:10 How the cassette player works
09:48 Changing rubber belts
10:32 Access transport shuttle buttons
17:15 Remove Mixer PCB
19:05 About cleaning the mixer
19:47 Detach record and playback amplifiers
21:06 Access headphone & remote control sockets
21:35 Remove power conditioning PCB
22:55 Power switch, internal fuse and transformer
23:56 Plastic button array
24:25 Cassette door mechanism
25:42 Conclusion