• Please review our updated Terms and Rules here

SFD-1001 not formatting

Digitalman said:
I assume I would do that by swapping the pins around on the connector?

I noticed in the schematics there is an S1 and S4 jumper that is associated with single side or double. If they are open they are single. But I'd have to cut the trace on the board to open it. Thoughts?
Click to expand...

I would NEVER swap the heads in this situation. The erase coil with too low resistance could easily damage permanently the driver which is mostly in the U11B hybrid and you'll have a dead drive as a result.
I don't know how the firmware reacts to those S1 and S4 cut, I've never seen a 1001 in real life. I'd try cutting them and disconnecting the green wire going to the top head. If it starts working as a single side drive, you have something still useful.

Frank
 
iz8dwf said:
. I'd try cutting them and disconnecting the green wire going to the top head. If it starts working as a single side drive, you have something still useful.

Frank
Click to expand...
Well now here is something! I cut S1 and removed the green wire from the bad head and it starts formatting. Seems to go through the entire disk but when it goes to write the directory it' starts to flash and then after a few seconds gives me the following error.
20 READ ERROR 38 0 0
 
Nevermind, I have to cut S4 as well. Successful format 2052 BLOCKS FREE!

Running a few more tests but looks like I'm running in single side mode.

Thanks to everyone for your help on this!
 
Digitalman said:
Nevermind, I have to cut S4 as well. Successful format 2052 BLOCKS FREE!

Running a few more tests but looks like I'm running in single side mode.

Thanks to everyone for your help on this!
Click to expand...

I'm glad it worked! If there's a command or something to change this drive back and forth between single side and double side mode, I would try to read double side disks too. Without that green wire, it can still read double side disks, just not write on the top side.
On the newer disks like 1571, it's all software selectable, no need for jumpers.
Maybe someone with a 1001 can shine some light on this.

Frank
 
Never assume anything with me! My electronics skills are beginner at best, now I know. I'll report back when I've had a chance to do this.

Thanks!!
 
Nevio76 said:
Digitalman try to change the chip MB433 ;)
Click to expand...

What does that IC do?

So I have an SFD-1001 Drive behaving EXACTLY as Digitalmans Drive is. But rather than change the drive to single sided I want to see if I can further diagnose it. Find out if it is a failed driver, etc.
 
back tracking in the post I ran some of the programs recommended.

Originally Posted by iz8dwf
I would simply try this:
10 OPEN15,8,15,"N0:TEST,TT"
20 INPUT#15,E,E$,T,S
30 ?E,E$,T,S
40 CLOSE15
Had an outcome of this: 20200229_102739.jpg

Trying to run Billdegs performance test gave these results:20200229_104830.jpg20200229_105011.jpg20200229_105016.jpg20200229_105345.jpg20200229_105409.jpg

Whenever I try and run the sfd-1001 test.prg from billdegs site all it does is just hang on "loading" on the sfd-1001 drive and the 8050 drive no matter low long I wait.20200229_103740.jpg
 
Last edited:
Digitalman said:
Sebaj, le kell vágnom az S4-et is. Sikeres formátum 2052 BLOCK INGYEN!

Még néhány tesztet futtatok, de úgy tűnik, egyoldalas módban futok.

Mindenkinek köszönöm az ehhez nyújtott segítséget!
Click to expand...
Hello Dear Team!
This is exactly the same for me. What is the reason? One side of the head is not good? If I cut S1 and remove the green wire, it works for me too. What is wrong with the head? Should I replace it? Is it worn out?
 
Last edited:
black_edition said:
Hello Dear Team!
This is exactly the same for me. What is the reason? One side of the head is not good? If I cut S1 and remove the green wire, it works for me too. What is wrong with the head? Should I replace it? Is it worn out?
Click to expand...
The upper head is not potted but the bottom one is. Do the mod as explained above as a I did and you will get a functional single sided drive. You will never find a replacement head so dont worry about that. ITs still a great Ieee488 drive even if single sided. My repaired drive went to someone who is using it with thier PET so its still performing its duties.
 
VERAULT said:
A felső fej nem cserepes, de az alsó igen. Végezze el a modot a fent leírtak szerint, ahogy én tettem, és egy működőképes egyoldalas meghajtót kap. Soha nem fog találni cserefejet, ezért ne aggódjon. Ez még mindig nagyszerű Ieee488 meghajtó, még ha egyoldalas is. A megjavított meghajtóm valakihez került, aki a saját PET-jével használja, így továbbra is ellátja a feladatait.
Click to expand...
Thank you! Yes, I repaired this unit so. Working. Single Sided but working. Thanks. But then Head is broken? Failing? Reason? Lot of time? Thanks
 
VERAULT said:
A felső fej nem cserepes, de az alsó igen. Végezze el a modot a fent leírtak szerint, ahogy én tettem, és egy működőképes egyoldalas meghajtót kap. Soha nem fog találni cserefejet, ezért ne aggódjon. Ez még mindig nagyszerű Ieee488 meghajtó, még ha egyoldalas is. A megjavított meghajtóm valakihez került, aki a saját PET-jével használja, így továbbra is ellátja a feladatait.
Click to expand...
What I'm saying is that even though both heads have normal ohm resistance, it's not 100% certain that it will actually format?
 
The upper head was not encased "potted" in epoxy. So moisture basically caused the windings to corrode and fail. Its a relatively common thing on some models unfortunately.

If you are getting proper resistance than yours might not be the dame failure and its worth teoubleshooting.
 
VERAULT said:
The upper head was not encased "potted" in epoxy. So moisture basically caused the windings to corrode and fail. Its a relatively common thing on some models unfortunately.

If you are getting proper resistance than yours might not be the dame failure and its worth teoubleshooting.
Click to expand...
I spent a lot of time repairing it. I have 3 heads from previous SFDs. But they didn't format. The performance test will tell you if the speed is not good. Format speed error. With this setting, the head should move. Basically, if the head is good, it will format. I don't mean the Ohmic resistance, I haven't come across a SFD with a broken head yet.
I also replaced a separate head in the drives. It turned out that if the head is good, it should format. Now I'm wondering if the SFD is single-sided and formats like that. What's the reason that one of the heads is not good? Probably what you're saying is that it wasn't kept in the right place. My SFD can be found on eBay. I'm Hungarian. I'm sorry it's not perfect, but I like it anyway. It's rare to find one that really works.
 
VERAULT said:
The sfd-1001 is a dual sided drive. The "repair" modifies the drive board into a single sided drive.
Click to expand...
I understand, I'm just curious whether the lower or upper part of the head is damaged in this case? This is the 5th such unit in my life where the head does not move and does not format. It can probably still be used as a single drive.
 
You must log in or register to reply here.
Back
Top