Macintosh Classic II disassembly

To show how easy it is to disassemble a compact mac, I have documented me upgrading the ram in a Classic II with pictures.

Start with a Classic II

You need a long shaft Torx T15 screwdriver in order to undo the top 2 screws underneath the handle, I have found that 2 extension bits and a T15 bit which are available in lots of screwdriver bit sets nowdays does the job. Some extension bits are thicker than others so you may need to try several until you find one that reaches.

With the computer upright undo the 2 screws.

The screws should come out with the screwdriver quite easily.

Now place the mac screen down (on a soft surface) and undo the bottom 2 torx screws, you can use an ordinary T15 screwdriver for this if you have one.

Now you need to remove the back part of the case, when these machines were new you needed a special tool to help separate the back, but it is likely the machine you are working on now has been opened a few times and the back should come off quite easily. If you are having trouble then using the palms of both your hands on either side strike the case in an upward motion (but not too hard).

Now you can see the insides of your mac, be careful when working near the tube as it is fragile especially the neck.

This suction cup bit is the anode cap, there is various debates regarding the charge built up in a CRT even when the mac is off, but if you steer clear of removing this cap you shouldn’t have to worry.

This screw fixes the analogue board to the chassis, we don’t need to remove it for this purpose but I will for demonstration purposes.

These cables join the logic board to the other parts of the Mac.

First we remove the 50 pin SCSI Hard drive cable, being careful not to hit our hand on the neck of the CRT.

Now the smaller floppy drive ribbon cable.

And finally the PSU cable, by pressing on the tab and pulling gently still making sure we don’t hit the neck of the tube.

Now the logic board slides upwards out of the Mac.

With the logic board out completely I can now upgrade the Ram.

The Classic II has 2 megabytes of ram fixed on its board and then has 2 simm sockets for extra ram. This board already had 2 1MB simms installed taking the ram up to 4MB in total.

Second simm removed.

I’m fitting 2 2MB simms, both simms have to be the same memory capacity in order for the Mac to work, If they don’t you get a nice little tune from your Classic to let you know!

Now slide the board back into the grooves in the chassis, you may need to guide it in gently.

Now reconnect the 3 cables.

I powered up the Mac at this point to make sure everything was OK, but if you are at all unsure then re-assemble before applying power.

Just check the total ram and yes 6MB, the upgrade has worked.

With the power back off, I will now continue the re-assembly.

Replace the bottom torx screws (the black ones).

And now by placing the Mac upright again position the screw on the Torx bit.

And slide the screw back in place, I don’t do these screws up really tight as you will have difficulty in retrieving the bits if you do.

And that is it!


This entry was posted in Vintage and Retro Computing and tagged by Sean. Bookmark the permalink.

About Sean

A self motivated highly experienced software developer and IT professional. Extremely technical, thorough and with excellent problem solving skills. Able to develop on a wide variety of systems and integrate heterogeneous platforms together. A proven track record of project successes from conception through to delivery. In depth knowledge acquired through exposure to a wide variety of technologies.

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