Pin-out M7783 power supply Duo 230

[Berenod]

Does anyone know the pin-out?

The center pin actually has 3 parts (much like a headphone jack), and the cable has the shield (which is the minus), and then 3 other leads corresponding with the inner 3-part pin.
The powersupply I have started smoking and smelling when I put it in the poweroutlet, luckily not connected to the Duo at the time.

Last time I used the Duo, it worked normaly up till I just disconnected the power supply.

As it is a 24VDC 1.04A rated supply, and I have many 24DC powersupplies, I would like to use those for the Duo, just not sure of the pin-out, and not sure how the charging circuit works (thinking of the weird way a Mac Portable works).

Any tips? I'd rather avoid blowing up the Duo!

 

[3lectr1cPPC]

I don't know about the pinout, but the smoke was probably a rifa cap blowing.

PowerBook Duo 230 - did I kill it?

Hi! I have a PowerBook 230 with two power bricks. Last time I turned it on was half a year ago, just to see if it still worked before I trying to sell it locally. Then the condition was unchanged from before I put it in storage: all ok, but some flickering on the screen and vertical lines...

68kmla.org

This thread shows an image of the inside of the supply, and you can see it on the live (input) side, it's the big yellow rectangular one. They blow up all the time, and the supply may work without it (other supplies with rifas can, not sure about the duo supply though), but if you want to replace it, it should be pretty easy (once you get the thing open at least).

Another option would be to find a yo-yo adapter with the right plug, or an adapter for a PowerBook 1400, 2400, 3400, or G3. They all work as well with the duos.

 

[Berenod]

Looks indeed like a very blown Rifa, boy, does that thing stink
Just ordere a new one, it's a 3 pin version , don't have those lying around at work...

 

[Berenod]

Jesus, what is it with those rifa's?
The above one I repaired a few months ago, but opening the adapter it got cracked, working but not looking nice.

So by accident I saw a cheap one for sale, picked it up, as a not yet opened one looks nice.

Worked like a charm for a few days, and then, this afternoon, suddenly that God awful stench again, along with the oily smoke .

Ripped out the power cord, opened up the adapter (careful now, not cracking it, not easy!), and sure enough, rifa cap exploded....

Bought a few last time (less then 1€ each), se replaced and the adapter is working normally again.

My hands are still smelly, cleaned them a dozen times, pretty much impossible to get the rifa juice of of them....

 

[digitalrampage]

Ripped out the power cord, opened up the adapter (careful now, not cracking it, not easy!), and sure enough, rifa cap exploded....

Any tips on the opening process???

 

[3lectr1cPPC]

Best way I know to get one of those apart is to use a vice. Any other way will likely leave a mess (well, a bigger one than a vice, the vice will also cause damage).

 

[imactheknife]

Looks indeed like a very blown Rifa, boy, does that thing stink
Just ordere a new one, it's a 3 pin version , don't have those lying around at work...

View attachment 39463

Do you have a part #? I have two duo supplies that have cracked rifa caps.

 

[Berenod]

Do you have a part #? I have two duo supplies that have cracked rifa caps.

Toon me a bit of searching, couldn't recall where I bought the replacement

Anyway, here goes:

https://be.farnell.com/kemet/pzb300mc23r30/cap-0-15-f-20-paper-radial/dp/1678911?CMP=e-email-sys-orderack-GLB

 

[pawihd]

Hi,
I have also a blown up AC-Adapter and would like to replace it with a standard single 24 V power supply.
Does it really only need 1 voltage?
I am confused about the 3 Pin connector and don't know where to apply the 24 V.

Appreciate your help
Peter

 

[imactheknife]

Hi,
I have also a blown up AC-Adapter and would like to replace it with a standard single 24 V power supply.
Does it really only need 1 voltage?
I am confused about the 3 Pin connector and don't know where to apply the 24 V.

Appreciate your help
Peter

Just use an power adaptor from a powerbook pismo or clamshell.

 

[A24A]

Hi,
I have also a blown up AC-Adapter and would like to replace it with a standard single 24 V power supply.
Does it really only need 1 voltage?
I am confused about the 3 Pin connector and don't know where to apply the 24 V.

Appreciate your help
Peter

The interesting part in this case would be the plug inside the barrel. This is similar to a 3.5 mm stereo headphone plug (it may even be possible to design some kind of DC cable adapter based upon that, modified and insulated in order to prevent short circuits). The tip of the plug does not appear to be connected. The middle ring seems to be minus (-) or 0. The section near the cable entrance would then be + (plus). However, I suggest that you double-check the polarity via a web search for something like Duo or iBook G3 Clamshell DC power plug pinout.

 

[pawihd]

Thanks for your answers!
This is exactly the problem. On what connector pin would be the + (and -) of the 24 V?
I cannot find anything about it on the web.

When i open the power supply i see a little connector with 4 wires.
I verified the connections to the plug via measuring! See my sketch!
My plug seems to have only 2 sections on the inner pin!?

The blue (a little thicker) and orange wires are connected together on the board and i guess this is ground or shield and also (-).
But what segment on the inner pin goes to +24V?
As my power supply is dead i cannot measure it.
Can anyone do?

After more investigation on the board, i am pretty sure that blue and orange wires (outer shield of the plug) are (-) and the violett wire (inner section of the pin) is (+) !
They are directly connected to a big Elko which is labeled accordingly.
The yellow wire goes only to a side contact on the power supply (charger connector).

But i am still somehow suspicious

 

[A24A]

Thanks for your answers!
This is exactly the problem. On what connector pin would be the + (and -) of the 24 V?
I cannot find anything about it on the web.

When i open the power supply i see a little connector with 4 wires.
I verified the connections to the plug via measuring! See my sketch!
My plug seems to have only 2 sections on the inner pin!?

The blue (a little thicker) and orange wires are connected together on the board and i guess this is ground or shield and also (-).
But what segment on the inner pin goes to +24V?
As my power supply is dead i cannot measure it.
Can anyone do?

After more investigation on the board, i am pretty sure that blue and orange wires (outer shield of the plug) are (-) and the violett wire (inner section of the pin) is (+) !
They are directly connected to a big Elko which is labeled accordingly.
The yellow wire goes only to a side contact on the power supply (charger connector).

But i am still somehow suspicious

View attachment 72678

Hello,

You may want to have another look at my previous reply. As far as I can find out from information on the Internet, the tip of the pin would be unconnected, the (middle) ring would be ground (or -), and the sleeve (deep inside the barrel) would be + 24 V. The role of the barrel itself is a bit unclear (it may or may not be "floating" with a higher resistance to other parts of the assembly). However, do not accept this information without confirmation from other sources.

I have an M5159 black adapter as well as two yo-yo adapters M5474 and M7332, but it is difficult to gain access to the pin/plug inside the barrel for readings, so could not offer any values at this time. Also, the wire colours may be different from adapter to adapter. These adapters were intended for other models, but have been used with a Duo, too.

Try a web search for "iBook G3 Clamshell DC power plug pinout" (or something like that) and you should find pinouts and pictures as a comparison. Please note that the ground connection may/will differ from what is normally used for headphones et cetera. In order to avoid short-circuits involving cable shielding, it is important that this is observed. You may also have to open the PowerBook Duo computer and check the wiring to the DC input jack.

 

[pawihd]

Hi,
as i did not really find informations about the connector to my Duo 230 PowerBook (i am not sure about these connectors shown for the clamshell model) i simply did a more thorough inspection, visually and electrically of the plug.

And you are right!
One can see, that there is an additional middle ring and when i tested the electric contact to the wires it is also connected to ground or (-) as the outer plug shield.
So i take the following picture as equivalent to my plug (the housing of the plug is also ground).

Thanks for your helpful comments!

 

[A24A]

Thank you for the update. It may be wise to be a bit careful about the status of the barrel. When I carried out a very quick resistance check between the barrel and the ring and sleeve for one adapter, the readings were relatively high. One should perhaps not automatically assume that the barrel must be connected to ground/minus. It may be worth noting that somewhat newer Macs had charging indicators, and the barrel may or may not be involved here. This could possibly be different on older and later power adapters. So, an extra check of the DC input jack wiring on the Duo might be a good idea in order to determine exactly what is connected where, and how.

 

[alectrona2988]

afaik the duo does share the same plug as the infamous yoyo charger (which costs more than getting an ibook g4 with the charger included nowadays) but i did notice the duo's PSU is 36W(?) as opposed to 45W which the other 3.5mm barrel chargers used. perhaps the pinout is also different on the duo charger?

 

[3lectr1cPPC]

All with that connector are the same pinout.

 

[A24A]

afaik the duo does share the same plug as the infamous yoyo charger (which costs more than getting an ibook g4 with the charger included nowadays) but i did notice the duo's PSU is 36W(?) as opposed to 45W which the other 3.5mm barrel chargers used. perhaps the pinout is also different on the duo charger?

Hi,

A certain difference regarding the way the power adapter is recognised and how charging is monitored cannot be ruled out. Cannot imagine any major differences, though.

BTW, used the M5159 and M5474 adapters for a quick startup test with a Duo 230 earlier today without a problem. Also had a PowerBook Duo AC Adapter M7783 lying around (24 V DC output at 1.04 A maximum, that is, 25 W). Just tested that one OK with the 230, too.

EDIT: Noticed that the M7783 label has a standard icon - (minus) outside and + (plus) centre pin printed next to the CSA, VDE, S, etc logotypes!!!??? Clearly some kind of misunderstanding somewhere.