Floppy drive troubleshooting

[+FarmerPotato]

I am trying to test all my hardware, and I'm having no luck with floppy drives. 

 

I verified that my TI disk controller works with the original TI re-branded full-height drive.

 

I bought a new-old Tandon TM65-2L DSDD, 360k, half height, perfect match. I intend to test it alone, so I put in a 150 ohm termination pack. The manual doesn't

say what termination it needs but...

 

It does not spin up. The light comes on. The spindle turns freely by hand at all times.  On first power up, when it should spin, it doesn't.  No busted caps (there are only a few electrolytic.)

 

Not sure how to proceed with that one. Any pointers to resources? Basic maintenance?

 

I found the TM-100 (full height) troubleshooting guide. I wonder if the drive belt is missing? I can see a shiny surface on the servo (nah, its labeled Step Motor) where I think there should be a belt. But it is not accessible like on the TM-100 full height.

I moved JP7 from "spin up on MOTOR" to "spin up on DS" and I *think* I hear a slight whirring.

 

I also have a TEAC FD-55BR from my own 80s CorComp MPES. It worked not too long ago, but now gets only read errors. (Its twin met the same fate earlier.)

 

And I bought a used YD-888 but it does not spin up either.  In the idle state, I can spin the wheel freely. When I attempt to read from floppy, the spindle does not turn. It freezes up. The light does not come on either. So there is a motor problem.

 

Manuals:

http://www.bitsavers.org/pdf/tandon/

 

[dgrissom]

1 hour ago, FarmerPotato said:

I am trying to test all my hardware, and I'm having no luck with floppy drives. 

 

I verified that my TI disk controller works with the original TI re-branded full-height drive.

 

 

Years ago, I knew all of this stuff.  

You may already have reviewed this:  

http://www.unige.ch/medecine/nouspikel/ti99/disks2.htm#Shunt pack

 

 

Currently, I fight through nanoPEB and TIPI stuff.  Old mechanical things scare me.  ?

[+FarmerPotato]

5 minutes ago, dgrissom said:

Years ago, I knew all of this stuff.  

You may already have reviewed this:  

http://www.unige.ch/medecine/nouspikel/ti99/disks2.htm#Shunt pack

 

 

Currently, I fight through nanoPEB and TIPI stuff.  Old mechanical things scare me.  ?

Yeah, that's a good beginning.

 

I already verified the termination pack, and the (shunt) jumper is set to DS0. That's where I noticed the A-B-C motor jumper and changed it.

 

I want to remove the logic board so I can see inside.