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| May have screwed up my SuperDrive |
Posted by: LaPorta on 2020-03-13 21:11:58
SO I was doing my usual maintenance on a SuperDrive, when I noticed that the motor was sluggish. I proceeded to open the actual eject motor itself and add a tiny bit of lubrication. Turns out that was a bad idea. I have a feeling I may have shorted out something on the circuit board. First, I dumped more oil in there than I should have (idiotically forgetting the need for an electrical connection). I then proceeded to test the motor in the drive...and nothing happened. Second, I opened the motor back up and accidentally messed up one of the brushes for the motor (big mistake), so I tossed that and got a donor one from my spare parts drive. Now, when I try to eject, still nothing happens. It doesn't even make an attempt. I took the motor out and manually spun the large eject gear, which closes the motor run switch. This does indeed cause the motor to run normally, as well as stop when the switch is opened. So, electrically, the eject motor does function. It appears that the correct signal is not getting sent to the motor to start ejection. I don't know a thing about the electronics in these, and have never found a manual for them. Does anyone have any idea where I'd begin here? P.S. -the drive reads and writes just fine, the only issue is ejecting.
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Posted by: LaPorta on 2020-03-13 21:58:09
Checking the circuit paths near where the motor connects, it appears transistor Q9 is fried (there is no resistance on the leads, and there are readings in the megohms values on a known good board). The problem is, I don't know what the heck the part is. One board has them labeled as B•6, the other BV4. This is all way over my head. I'm really drowning on this one. I'd hate to think I consigned this drive to the scrapper...
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Posted by: LaPorta on 2020-03-14 09:35:05
Update: realized it’s a diode, not a transistor. Probably overloaded it, I’m sure. I think I found a replacement on mouser, found a great guide online for the codes.
Will get back here in probably a week or
so when I have the part.
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Posted by: superjer2000 on 2020-03-14 09:41:58
Update: realized it’s a diode, not a transistor. Probably overloaded it, I’m sure. I think I found a replacement on mouser, found a great guide online for the codes.
Will get back here in probably a week or
so when I have the part. Can you link to the diode code guide you found?
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Posted by: LaPorta on 2020-03-14 11:46:12
Downloadable as a PDF
https://www.sphere.bc.ca/download/smd-codebook.pdf
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Posted by: LaPorta on 2020-03-15 18:11:53
By the way, does anyone know just what types of resistors are mounted on the back of the floppy PCBs? Trying to find proper resistors...
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Posted by: AwkwardPotato on 2020-03-16 11:37:27
Opened up my MP-F75W-11G to check and there are two different sizes of resistors on the PCB. Smaller ones are 0805 case code (imperial), and larger ones are 1206 case code (also imperial).
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Posted by: LaPorta on 2020-03-16 11:39:23
Where's you find that? I only had color resistance codes...
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Posted by: AwkwardPotato on 2020-03-16 11:46:23
Here's a chart with all the size codes: http://www.resistorguide.com/resistor-sizes-and-packages/. The three numbers on the top of the resistors tell what the resistance is: https://www.hobby-hour.com/electronics/smdcalc.php.
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Posted by: LaPorta on 2020-03-16 11:47:17
We may have different types of components. I'll get a photo of mine this evening. No codes...I'm glad you found some!
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