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Powerbook 100 - DC power socket assembly missing a component

electricmonk

Active member
Hi there,

I have two Powerbook 100s. My plan is to make one really good one out of these two old beauties.

I recapped one of them but it won't boot off my rebuilt battery. I have been suspicious of the appearance of the DC power socket for some time and then today while browsing online looking for info I noticed that my recapped logic board seems to be literally missing a piece. Please see the two images below of the complete and incomplete power socket assemblies: I opened up my non-recapped PB100 (left) and saw very clearly what was missing from the recapped PB100 (right). I'm hoping someone will be able to enlighten me as to what this missing piece is. At a guess after a bit of googling, could it be a multi-layer ceramic capacitor? Is this some kind of bridge circuit or something?

complete dc socket.jpgmissing DC socket.jpg

It is with considerable regret that I realised once I looked at these side-by-side that the little brown component from the plug on the right was sitting on my desk for some months waiting for me to work out where it had come from before I swept it into the bin.

The weird thing is that the powerbook with the missing component works very well running off mains - it doesn't run off battery though, and this may be connected. I have posted about my attempts to rebuild the battery in the powerbook 100 battery rebuild thread.

Edit: updated theory as to what the component is after some googling

 
Last edited by a moderator:

electricmonk

Active member
Good news! Turns out I don't empty the bin nearly as often as I thought I did. Please excuse the terrible photo of this tiny thing - 5mm long, 4mm wide and 2mm high.

Edit: It reads 0.94 uF so I guess it definitely is a capacitor.

If anyone has any ideas as to what this part of the circuit does though I'd love to know. Also highly curious as to why this little cap would have fallen/blown off.

capacitor maybe.jpg

 
Last edited by a moderator:

Papichulo

Well-known member
Hi there,

I have two Powerbook 100s. My plan is to make one really good one out of these two old beauties.

I recapped one of them but it won't boot off my rebuilt battery. I have been suspicious of the appearance of the DC power socket for some time and then today while browsing online looking for info I noticed that my recapped logic board seems to be literally missing a piece. Please see the two images below of the complete and incomplete power socket assemblies: I opened up my non-recapped PB100 (left) and saw very clearly what was missing from the recapped PB100 (right). I'm hoping someone will be able to enlighten me as to what this missing piece is. At a guess after a bit of googling, could it be a multi-layer ceramic capacitor? Is this some kind of bridge circuit or something?

View attachment 32583View attachment 32584

It is with considerable regret that I realised once I looked at these side-by-side that the little brown component from the plug on the right was sitting on my desk for some months waiting for me to work out where it had come from before I swept it into the bin.

The weird thing is that the powerbook with the missing component works very well running off mains - it doesn't run off battery though, and this may be connected. I have posted about my attempts to rebuild the battery in the powerbook 100 battery rebuild thread.

Edit: updated theory as to what the component is after some googling
Hey do you have a extra hard drive for it? Mine is missing the hard drive cable.

 
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