Macintosh SE miniscribe revive

[leshazen]

Hi, I’ve been restoring a Macintosh SE, 800k 20SC machine. So far I’ve removed the PRAM battery, cleaned the inside, got the floppy drive to accept and boot off a 6.0.8 floppy. Without the floppy inserted the machine just boots to the floppy with a question mark.

I’m thinking the drive could have a case of “suction” and other problems… The led does blink iirc 4 reds.

I plan on removing it, any special tips on how I should go about getting it working again. I want to clean the pcb and make sure there are no burnt components. Also I was thinking about putting a drop of oil in the steeper motor for the head positioning.

Any other suggestions?
Thanks!

I don’t want to put in a scsi2sd etc unless if I can’t get this to work.

 

[Phipli]

Hi, I’ve been restoring a Macintosh SE, 800k 20SC machine. So far I’ve removed the PRAM battery, cleaned the inside, got the floppy drive to accept and boot off a 6.0.8 floppy. Without the floppy inserted the machine just boots to the floppy with a question mark.

I’m thinking the drive could have a case of “suction” and other problems… The led does blink iirc 4 reds.

I plan on removing it, any special tips on how I should go about getting it working again. I want to clean the pcb and make sure there are no burnt components. Also I was thinking about putting a drop of oil in the steeper motor for the head positioning.

Any other suggestions?
Thanks!

I don’t want to put in a scsi2sd etc unless if I can’t get this to work.

Whatever you do, don't move the sensor on the end of the stepper motor.

 

[leshazen]

Whatever you do, don't move the sensor on the end of the stepper motor.

Sounds good, what kind of oil would you recommend? Just one drop. Should I power it up externally on its side how many times should I plug it in to let the oil penetrate enough

 

[Phipli]

Sounds good, what kind of oil would you recommend? Just one drop. Should I power it up externally on its side how many times should I plug it in to let the oil penetrate enough

I'd start by working out what the LED error code is

Miniscribes are notoriously unreliable. I have one that doesn't spin up but moves freely. I need to have a look at it some time to work out why.

 

[Phipli]

 

[Phipli]

Annnnd this if you feel enthusiastic :

http://www.bitsavers.org/pdf/miniscribe/patents/pat4622499.pdf

 

[leshazen]

View attachment 51500

That’s great! I’ll check the exact error code when I get home

 

[Paralel]

Suction? I've never heard of that before. Did you mean "Stiction"?