Red Twin Famicom issues

[Nickerous]

Soooo, I went to change my belt in my red twin famicom.  When I bought it seller said brand new belt.  Must have forgotten "Needs a" because there was no belt, only brittle remains.  After some extremely finicky tense minutes (like 45), I get the new clear belt installed.  Aligned the read head (those dang springs) and screwed the drive back into the Twin. 

Figured I better test before putting the lid on.  It works!  Put the lid on, hmm...kinda finicky here too...screws go in, but not great.  No problem, probably need to go back in eventually anyway...except now disks throw an error 22 or 27 every time.  I can get to a black screen after now loading if I hit reset, but no further.  Would the cover be causing issues?  The led wire?  Drive worked without the lid...

Drive seems to start reading, stop for a second, and then start back.   Maybe the stops are causing the errors?

[Skawo]

The drive stops because it encounters an error.
Your calibration is off, or the belt is rubbing and causing the drive to run too slow.

What method did you use to calibrate?
Can you post a video of the thing running?

[Nickerous]

Pretty sure it's the belt.  I opened it up again and the belt was slightly raised on the small gold wheel.  Need to make sure I have all the old crusty belt off and reseat the new belt.

Thought I had done that, recalibrated the reader by spinning the wheel until it clicked and the 3 metal pieces lined up, loosened the screw, faced it towards the reader and retightened. 

Tested again, it finally read side a of Kid icarus once, but error 22 on side b.  Drive did sound a little slow and there was an audible change when trying to load side b.  I'll open it again later.

[Skawo]

Is it one of the early drives (without extra text on the front of the drive)?
See if turning it upside down helps.

[fredJ]

The reseating of the metal triangle is hard to do accurately.
Same with the positioning of the read head.

Usually I just screw on the cross-hair screw on the side to get it accurate.
Also needs to have the right speed.

Then also, many discs don't work. Kid Icarus is one that often has problems. Metroid is the most problematic (probably 50% fail rate). That's because they read so much from it.

[Nickerous]

Took my red twin back apart last night and cleaned the spindle again.  SMB 2 works great!  Drive sounds the best it's ever sounded while I have owned it.  Tried Kid Icarus this morning.  It works!  Reset and tried to overwrite a save on the disk, error. 

Tried Darkest Dungeon, it boots!  Tried Kid Icarus again, success!  Started a new game, played first level, tried to save, it hangs.....reset, error....reset again, I'm in, but all saves have been wiped.  Well, guess the Twin is sort of working.  Sound is terrible.  May look I to doing the sound fix, but have never soldered before in my life.

[Skawo]

That's definitely the belt slipping on the gear.

[fredJ]

Oh, regarding the sound, the red twin FCs often have two resistors swapped.

check here
https://etim.net.au/nesrgb/installation-famicomtwin/

under "Disk games sound bad."