5.25 Tandon weird issue
#1
I picked up some used 5.25 drives and one is a Tandon that I think is a TM50-1 drive. There's several Tandon labels on the drive and none have a model number. It has the look and feel of the TM50 drives including needing a U19 jumper for DS0/1 select.

It of course it needed the lead screw and head rails cleaned and lubed upon arrival.

Testing the drive after cleaning and replacing a 4.7 uf cap (busted by heavy handling) and SCP shows that it is a low density 48 tpi drive. Max. track utilities test is 43 or 44 tracks, erase function erases 0-39 tracks correctly using the full stroke of the head, media test is a bust since I'm using a known damaged diskette (used for 1st testing a drive), but it attempts to test 0-39 tracks if I take the time to tell it to ignore all the errors. Drive speed is 300 -301 RPM. So far all seems okay or within reason? However, if I try to make a copy the drive the SCP seems to be double stepping the head and it crashes into end stop at about track 22 as indicated on the SCP software.

Utilities moves the head correctly, but copy goes nuts and double steps the head. What am I missing?

Thanks,

Don
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Messages In This Thread
5.25 Tandon weird issue - by DeltaDon - 11-13-2020, 11:05 AM
RE: 5.25 Tandon weird issue - by admin - 11-13-2020, 12:22 PM
RE: 5.25 Tandon weird issue - by DeltaDon - 11-15-2020, 12:45 PM
RE: 5.25 Tandon weird issue - by admin - 11-15-2020, 02:00 PM



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