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marmotking
April 23rd, 2011, 12:21 AM
I have a TK70, which I'm pretty sure was given to me in working condition. I inserted a tape into the drive and even ejected it once. However, after trying to initialize the tape and receiving an error, I cannot seem to eject the tape. I've removed the tape drive from the machine now and have just connected power up to the drive. When powered up the "tape in use" light flashes for a while, than all three lights flash, indicating an error. I then try the "unload" button and the same thing happens. Could it be that the drive is bad? Wrong kind of tape? I took the cover off the drive and there's tape wrapped around the internal spindle. I see the solenoid that is used to remove the tape. I cannot see any way from the top of the drive to manually rewind the tape. The bottom of the drive is inaccessible as it's covered by a circuit board. Any suggestions at all on how I might proceed? It almost looks like the tape just doesn't rewind when I press the unload button.

Well, looking at:

http://deathrow.vistech.net/~cvisors/dec94mds/437abts2.pdf

(section 2-5) it looks like maybe the drive is bad. This is unfortunate, because now I have valuable media stuck in the drive. Again, any help is greatly appreciated!

RSX11M+
April 23rd, 2011, 12:57 AM
Believe it or not... the HP support website had a pretty good TK50 help document. It covered stuck media, and various "leader" problems.

You might look there. Sorry... I don't have a link handy.

marmotking
April 23rd, 2011, 01:02 AM
OK, I got the tape out. There's a hole through the circuit board on the bottom where you can insert a screw driver and manually rewind the tape. See a photo here:
http://download.marmotking.com/vcf/tk70_rewind.jpg

Then, you can manually push the solenoid on the side and the handle will unlock.

http://download.marmotking.com/vcf/tk70_solenoid.jpg

I don't know why it refused to unload on it's own.

marmotking
April 23rd, 2011, 01:26 AM
OK, well, I reassembled everything and put the drive back in the 4000/300. It all seems to work now. I can't explain it. I must have gotten something in a very strange state. At any rate, it's a TK50 tape in a TK70 drive. I can now mount it and read it. Of course I can't write it, because it's not a TK70 tape.

Go figure.

I'll look for the link you mentioned and if I find it post it here.

RetroHacker_
April 23rd, 2011, 05:27 AM
OK, well, I reassembled everything and put the drive back in the 4000/300. It all seems to work now. I can't explain it. I must have gotten something in a very strange state.
I can explain it. It's a TK50/70. Those drives do that from time to time. I've seen it happen too. The TK70 seems to be less flakey than the TK50, but still, those drives do stupid things from time to time.



At any rate, it's a TK50 tape in a TK70 drive. I can now mount it and read it. Of course I can't write it, because it's not a TK70 tape.


Here's an interesting bit of info about TK50/70 cartridges - they're the same. The media is exactly the same (350oe). The formatting is just different. But, you can't reformat a TK70 tape in a TK50 or vice versa... unless you bulk erase it. Then you can reformat it for whichever drive you want.

-Ian

RSX11M+
April 23rd, 2011, 07:02 PM
Looks like everything you did was in the "Stuck DLT40/70/80 Tape (http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=lpg50246)" application note on the HP site.

There are other app notes for rethreading dropped leaders (http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50338) etc.

These are no use to you now, but just in case others find this thread wanting assistance I posted the links.