Title: My case of repairing NeXT magneto optical drive
Post by: yusukeito on September 10, 2020, 06:23:39 AM
Post by: yusukeito on September 10, 2020, 06:23:39 AM
Hello community.
I have two NeXT 5-inch 256Mbytes MO drives.
Finally. I have got working one MO drive by repairing and combining two drives.
I will share my experience here.
1st drive: Produced in 1989, builtin early NeXT Computer(68030 by default. Now upgraded to 68040)
2nd drive: Produced in 1990, builtin late NeXT Cube (non Turbo 68040 model)
Before repairing:
1st drive: Not recognize disc.
2nd drive: Causes kernel panic. Has empty q error.
First, I replaced electrolytic capacitors on digital, analog and spindle board.
Here is my parts list of the capacitors.
The service manual is available at: http://www.nextcomputers.org/NeXTfiles/Docs/Hardware/NeXT%20Magneto%20Optical%20Service%20Manual.pdf
And also I replaced blue tantalum capacitor(10uF) on the spindle board with 10u 16V electrolytic capacitor.
For replacing capacitors I use desoldering gun.
After recapping. I attempted testing. But with not luck on any drives.
Next, I combined some modules of the two drives.
I figured out:
So I removed a spindle board from 1st drive and place spindle board from 2nd drive to 1st drive.
Finally I got working 1st drive.
Working video:
https://twitter.com/novi_/status/1303726619819876352?s=20
Removed caps(left) and new caps(right):
Two drives(left is 1st, right is 2nd):
I have two NeXT 5-inch 256Mbytes MO drives.
Finally. I have got working one MO drive by repairing and combining two drives.
I will share my experience here.
1st drive: Produced in 1989, builtin early NeXT Computer(68030 by default. Now upgraded to 68040)
2nd drive: Produced in 1990, builtin late NeXT Cube (non Turbo 68040 model)
Before repairing:
1st drive: Not recognize disc.
2nd drive: Causes kernel panic. Has empty q error.
First, I replaced electrolytic capacitors on digital, analog and spindle board.
Here is my parts list of the capacitors.
- ECE-A1CKS470 (47u 16V)
- ECE-A1CKS100 (10u 16V)
- ECE-A1AKS220 (22u 10V)
- UMA1H010MDD1TP (1u 50V)
- ECE-A1HKS2R2 (2.2u 50V)
- ECE-A1HKS3R3 (3.3u 50V)
- UMW1V100MDD (10u 35V)
- UMW1V220MDD (22u 35V)
The service manual is available at: http://www.nextcomputers.org/NeXTfiles/Docs/Hardware/NeXT%20Magneto%20Optical%20Service%20Manual.pdf
And also I replaced blue tantalum capacitor(10uF) on the spindle board with 10u 16V electrolytic capacitor.
For replacing capacitors I use desoldering gun.
After recapping. I attempted testing. But with not luck on any drives.
Next, I combined some modules of the two drives.
I figured out:
- Spindle board of 1st drive is wrong.
- Digital Analog board of 2nd drive is wrong.
- Laser module(bottom case) of 2nd drive is wrong.
So I removed a spindle board from 1st drive and place spindle board from 2nd drive to 1st drive.
Finally I got working 1st drive.
Working video:
https://twitter.com/novi_/status/1303726619819876352?s=20
Removed caps(left) and new caps(right):
Two drives(left is 1st, right is 2nd):
Title: Re: My case of repairing NeXT magneto optical drive
Post by: Rob Blessin Black Hole on September 12, 2020, 12:21:18 AM
Post by: Rob Blessin Black Hole on September 12, 2020, 12:21:18 AM
Hello : A very impressive project :) Best regards Rob Blessin