System Software Install Issue on Mac Classic II

[eR1c]

Forgive me is this is listed somewhere, "Search..." did not retrieve any threads.

I have a Mac Classic II which had a PRAM battery leak all over the place killing my motherboard.  I have successfully found a good motherboard from another Mac Classic II which I've put into my computer.  The computer boots to a screen w/ a folder w/ a "?" inside it.  I've installed system 7 from floppy with success.  However when I go to re-boot my computer I get the folder with the "?" inside it again.  

Any help would be appreciated!

 

[eR1c]

I tried using disk tools to initialize the hard drive, but disk tools tells me that there is no useable scsi drive available.

Is this a failed hard drive or could it be something else? Also there is a very faint hissing noise when I am running the computer.

(I have tantalum capacitors on order and plan to re cap the motherboard as a precautionary measure).

 

[MJ313]

What make/model/size of hard drive do you have in there now? Could be any number of issues... do you have another hard drive you could throw in there to help eliminate some possibilities?

 

[eR1c]

I have the stock/original Apple hard drive...   I don't have another 50-pin HD that I can try unfortunately.  A number of issues, ..was afraid of that.  Are there any common issues or things I should before I assume its the HD?

 

[eR1c]

This MAC was in storage for at least 10+ years and it did take a bit of finessing to get the drive to spin initially.  

 

[MJ313]

Yeah, that's a bad sign right there... so if that's one of those Quantum drives, the head stop is probably just sticky goo now. There are ways to fix these things, with some probability of success. Charles did a nice right-up here:

https://68kmla.org/forums/index.php?/topic/23871-vintage-hd-stickysolutionlazymans-40mb-80mb-160mb-quantum-prodrive-els/?hl=quantum

It may be time for a new drive though, and there are options for that. SCSI2SD, or one of Charles really fast 10k drives, or even an older replacement. You could post a WTB in the for sale section. Compnurd or MacDrone probably have a bunch.

 

[eR1c]

Thank you,

I may give the rubber stopper technique a try.

Should I need a new HD,

Do I need to load software onto any new drive for it to be recognized? Or will most any 50pin SCSI drive work ...just plug and play sort of speak?

I'll post in the WTB section, 
I also saw that Uniserver sells drives w/ the OS already installed (which I don't need) for about $55 plus shipping (if I can just plug in a 50pin SCSI drive they can be had on eBay for $20 or less which is a lot cheaper).

 

[MJ313]

If it's not an Apple drive, you would need to format it with the 7.5.3 Patched Image here:

http://maccaps.com/MacCaps/DIY_Information.html

Uniserver's drives really are pretty awesome. I have one and it's in my IIcx now, but I move it around. You may need a drive adapter to have it fit in your Classic II. I am not totally sure. But they are pretty cheap on Amazon or ebay.

 

[Apache Thunder]

I personally would not approve of putting a 10k drive inside a compact mac. At least I wouldn't put one in my own mac.

They get along fine with larger machines, but 10k drives generate more heat and draw more power then normal drives. Put it in a external enclosure if you can.

Maybe the Classic II is beefier and could handle it, but it's definitely not something I would put in a SE or SE/30.

 

[eR1c]

Thanks guys! 

So close to getting my Classic II fully functional! It's been a long road ...i found it in the attic where it had been for over 10 years. I am so close! 

Okay, I may try one of uniservers drives for the extra $$ it may be worth the cost rather than screwing around on ebay to save $20 or so.

 

[MJ313]

Dunno, I ran the 10k drive in my SE/30 and it was fine.  Uniserver's are 2.5" though... I wouldn't throw a 3.5" there, as you said they get hot.

 

[eR1c]

Thanks going to contact Uniserver about a 2.5" drive.  

 

[Apache Thunder]

Ahh I see. A 2.5 drive has the same connector as a 3.5 one? With IDE drives the connector was smaller and combined the power pins. SATA only changes in form factor for optical drives. Wasn't sure about SCSI though as I've never personally seen or used one in that form factor. That and the newer 68/80 pin drives I definitely have no experience with.

I think the 50 pin drives change in pin count for the 2.5 drives. I just don't know about the newer 68/80 pin SCSI drives...

Yeah a 2.5 drive should be fine then, they are smaller and probably have a smaller heat and power footprint compared to the larger 3.5 ones. Hard to imagine how they managed to fit a 10k drive into a laptop sized drive.

 

[uniserver]

yup, not only that but they only consume 500ma on the +5 rail and only 700ma on the 12v rail.

and they ultra quiet as well,   

 

[eR1c]

Okay, looking to all of you for help.

I am still having the same issue,

that is the flashing ? folder on startup.  Basically my hard drive is not recognized because it does not appear to be powering up.

This issue has plagued this computer since I undertook this restoration project.

Here is what I've done:

1) Replaced PRAM battery w/ a brand new battery -still same issue after startup

2) Replaced ALL capacitors on the motherboard ...after doing that, still the flashing ? folder at starup

3) Purchased new hard drive from "Uniserver" (thank you)  -plugged in and still had the same issue

4) Replaced ALL capacitors on the logic board, -same issue.

This computer has a ton of new parts in it and once I get it going I feel like it will run for a very long time.  Yet just can't get the hard drive to spin.  Suggestions/Ideas?

I read somewhere that someone had a somewhat similar issue, the culprit was a 6pin connector of some sort on the logic board? ..

 

[eR1c]

I found a similar issue on another tbread, "QP1" on the analog board was the issue.

"Problem Solved : thank you Guys , replaced QP1 with CNY75B 023 A TFK4 0883 now Classic II is back to life !"

I may try replacing this part, does anyone know where I may find a replacement?

 

[eR1c]

Found this:

Would this work as a suitable replacent?

http://www.ebay.com/itm/4-pcs-CNY75GB-Optocouplers-DIP-CTR-100-min-14A1-/361399391980?hash=item54251516ec

 

[eR1c]

..Okay, one more thought after sleeping on this. 

Wondering if everything is actually find w/ my hardware.

I did verify that the hard drive is receiving power ..so it seems that all the connectors to the drive are fine.

The computer will boot off a floppy disk ..i can use disk tools but it does not see "a suitable scsi drive".

So could this be a software related issue? I have the drive that Charles sent me, -so I am assuming that drive is good.  

Is there some startup sequence I can try to get my MAC to recongize that there is a hard drive? ...I think maybe I should rule out software issues before I start replacing more hardware on this thing.

 

[eR1c]

..here is what is odd,

I tried installing the OS as it asked and it recognized the name of my hard drive "Eric" ...how is that? 

(see photo),

of course after successfully installing the OS it goes right back to the flashing ? folder.