Classic hard drive intermittent spin up

[macclassic]

Sometimes when I switch on my Classic the hard drive starts to spin up then suddenly slows down like the power's been cut, it makes a noise and then starts to spin up again... and would go round in a loop if I left it on. xx(

At other times it just spins up and everything's fine :b&w:

I've tested the voltages on the external drive connector and get 5 volts on pin 6 and near enough 12 volts on pins 7 and 8.

I don't know what to try first, the drive, or caps on the analogue board? and would like to know if it's a "Classic" case of one or the other.

Any advice welcomed.

 

[uniserver]

the A/B needs caps ASAP,

you can do it your self, or i can do it for you.

The HD is not getting enough power, and its going to end up getting worse.

You will notice that if you took a hair dryer to the smoothing caps in the A/B, heated them up some then flipped it on,

The hd will probably start up and work normally, for the time being.

ps:

all the caps grouped together near the speaker are the ones in question.

.

 

[sadmanonatrain]

macclassic,

Here is a diagram of the power supply for the Macintosh Classic II: https://drive.google.com/file/d/0B6j6P7lBWw-BVU5LZVA4SmRSTlE/edit?usp=sharing

Also, for reference, the Macintosh Classic/II service manual: http://tim.id.au/laptops/apple/legacy/classic_ii.performa_200.pdf

If the capacitors have leaked make sure to give the board good clean with alcohol.

Do you have any other 50 pin SCSI hard drives you can try?

I hope this helps!

 

[techknight]

If its a quantum hard drive, this behavior is expected.

 

[macclassic]

Thanks for some "very" good information.

I've already replaced some caps on the logic board to fix a losss of sound, so it seems like more of the same.

Techknight, could you please give me more information on Quantum drives as I'm still concerned about the drive and am considering the following for plan B. http://www.ebay.co.uk/itm/IBM-WDS-380-80MB-50-Pin-SCSI-Drive-/380683502787?pt=UK_Computing_Other_Computing_Networking&hash=item58a28144c3

 

[macclassic]

UPDATE. I de-soldered the caps from my A/B and nearly all of them were wet underneath !!! which is a wake-up call, so now I'm shopping for caps.

My hard drive is a Conner CP 3040A ?

 

[macclassic]

I replaced the caps near the speaker and my problem remains, so I tried the drive in my 6100/60 and it's doing the same

So it's the driive after all.

Plan B, has anyone put one of these in a Classic? http://www.ebay.co.uk/itm/IBM-WDS-380-80MB-50-Pin-SCSI-Drive-/380683502787?pt=UK_Computing_Other_Computing_Networking&hash=item58a28144c3

 

[max1zzz]

why not use a morden sca server drive?

you can pickup a 36gb sca drive for about 8 quid, then the adapters are a couple of quid

the only problem is that these do not have termination, so you either need a passthrough terminater, a external terminator, or use one of my terminated adapters

my only concern would be heat, as sca drives can get quite hot

 

[sadmanonatrain]

macclassic,

Plan B, has anyone put one of these in a Classic? http://www.ebay.co.uk/itm/IBM-WDS-380-80MB-50-Pin-SCSI-Drive-/380683502787?pt=UK_Computing_Other_Computing_Networking&hash=item58a28144c3

I bought one of these drives last summer and used it in my SE/30 and it worked very well; I think they're NOS!

 

[macclassic]

Thanks for the suggestion max1zzz only I don't need another challenge at the moment, so I looking for the easier option. :b&w:

---------------------------------------------------------

"sadmanonatrain" I'm interested. Apart from formatting and blessing was your IBM drive plug and play? or did you have to set some jumpers (or termination) on it?

New Old Stock, yes, but hopefully well stored !

 

[sadmanonatrain]

macclassic,

"sadmanonatrain" I'm interested. Apart from formatting and blessing was your IBM drive plug and play? or did you have to set some jumpers (or termination) on it?New Old Stock, yes, but hopefully well stored !

To use the drive I'm my SE/30 I set the jumpers to SCSI ID '0' so the Mac could use it as a boot device. The data sheet that deals with drive specification and setting a SCSI ID is still available online.

The drive was contained in a anti-static bag and its external condition was very good!

I hope this helps!

 

[macclassic]

Thanks for replying. Sounds good, I'm going to order one ASAP

 

[onlyonemac]

If the sticker on the drive says "Quantum" then it's definately the hard drive. Those hard drives always fail after a while.

Take a look at http://68kmla.org/forums/viewtopic.php?p=157874#p157874 if you're keen to risk trying to fix it. For a temporary fix (to recover your data), I've heard that opening the drive while it's spinning up and then manually unparking the heads can get it going. Remember to put the cover back straight after unparking the heads though.

 

[macclassic]

No it's definitely a Conner.

Thanks, but I'm not ready for Open-Drive-Surgery yet, though last night I had to give a Barracuda a slight tap to get it spinning, like tapping old electric fuel pumps to seperate stuck contacts.

 

[techknight]

I havent run into a conner yet (outside of the one in my portable). So I cant say for sure of its failure modes.

 

[macclassic]

I had to make some serious brackets to get the full height 80MB IBM drive in, to move it back and towards the center of the machine, see picture.

But the good news is, it makes some great start up noises, reads and writes a lot faster and recognises all of the 80MB !

I'm very pleased :b&w: :b&w: :b&w:

 

[onlyonemac]

I havent run into a conner yet (outside of the one in my portable). So I cant say for sure of its failure modes.

Umm...
The guy I got my Mac's current hard drive from gave me a Conner... But apparently it's an "extra durable" model (by coincidence, I guess). The kind you would find in a hospital, or even a space shuttle.

I did think that Conner's were quite popular back in the day, weren't they? But then, so were Quantums...

 

[sadmanonatrain]

macclassic,

It's nice to see your Classic running properly; there are a nice machine especially when you boot it from its ROM.

Those full height drives always make characterful noises!

Enjoy!

 

[uniserver]

I like your custom mounting, good job. And good on that AB cap job too! Oh did you end up doing the caps on the mainboard as well? - if not might want to be something to keep an eye on. Also keep your Connor around… the controller board might be useful at one point with your expanding vintage mac collection