IBM PS/2 Model 50z Boot Problems

[enter_a_nickname16]

Hello all! This is my first post on this forum, as I just recently got into vintage computing.
Anyways.....

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I recently purchased from eBay an IBM PS/2 Model 50z along with an IBM Model M keyboard. Excited by my new acquisition, I proceeded to take both the computer and keyboard apart and give them a proper cleaning. Everything looked good inside, except for the dead CMOS battery which I replaced with a "Varta" battery from Amazon. Sounds like everything was going good, right? But then when I turned the system on with a reference disk inserted, it gave me the 161 & 163 errors after counting the RAM. After a few searches online, I figured my best course of action was to replace the caps in the Mitsubishi FDD. Yet after I did this and set everything back up again as before, the system gave the same errors. The only difference this time was that the floppy drive made noticeable seeking noises and the spinner motor kept running for a long time after.

Currently, all I can do with the system is get it to boot into BASIC by pressing F1 after the OK with a red cross appears. What could be wrong with it? I noticed on the drive's board there was some corrosion on the pins of a few chips, but I cleaned those up. All I think that could be wrong now is that when I removed the bottom circuit board I didn't mark the orientation of the magnet part of the motor which has a small metal part sticking out (idk if it matters or not?)

 

[kotseman]

I recently had the same problem as yours!
Same 161 & 163 errors...
I fixed the issue by just unplugging and then plugging back on the whole floppy drive daughter card assembly a few times:D
I don't know ..... maybe it was just some bad contacts!
But unlike yours my drives didn't even seek when the errors appeared.

 

[modem7]

Welcome to these forums.

Do you know for fact that your reference diskette is functional ? I ask because we have seen on these forums, cases where someone was creating the diskette (obviously on another machine) and there was a problem with the result. And I think at least twice, we have had people report something like, "After my fifth attempt at creating a diskette, did I finally have one that worked."

 

[enter_a_nickname16]

I am pretty sure it works, as I tried the floppy in a USB drive with QEMU using "qemu-system-i386 -fda /dev/sdb" and it went to the blue IBM screen.
Also, I was looking at the machine yesterday and noticed one of the capacitor traces on the bottom board was broken. I'll try my best to fix it and report back here if it does anything.

 

[enter_a_nickname16]

Good news!!! The system can boot floppies now! I put in the reference disk and got everything all setup. Now however, the HDD won't boot. I did try an ms dos 5.0 boot disk and looked at the data but any programs on the disk would give read errors. I tried taking the drive out and oiling the motors but that has appeared to do nothing. Is there anything else I could do with this drive or should it be replaced? What would I even replace it with?