Re: Modern replacement power supplies for Apple ProFile hard drive?

I'm getting closer... I just discovered that I have a power supply that "almost" meets the criteria I need. It has the right +/-12VDC and 5VDC, and it is 50 watts - more than I need. It is a working pull from a Cisco 2600 series router I recently stripped. I want it to be low in watts so that I don't have to run a fan.

The only problem now is that the ProFile's power supply provides an additional "AC" line to the controller board. This AC line provides a signal to the controller board, basically telling it that the mains power is working. If the mains were to shut off, there is enough power stored in the capacitors to allow the controller board to power the ST-506, empty the cache to the hard drive, and then properly shut down. Unfortunately, the power supply I found doesn't provide this. As a matter of fact, I don't think "any" power supply does this. This is something that was special to the ProFile. I'm not even sure if the Apple Lisa II's power supply did this for the internal widget drive.

What I'll need to do then is research exactly what kind of a signal this AC line actually provides. Maybe I can create this signal using an Amtel microcontroller. I'm assuming it is probably a digital signal (on or off) or an analog signal with a certain amount of resistance being sent through it while the mains is running.

Time to read through more of the documentation that was sent to me. Hopefully there's something in there that talks about the AC line.

On Sun, Dec 22, 2013 at 3:28 PM, Bryan Villados <groink1_at_email.domain.hidden> wrote:

> Wow! A lot of stuff to pour through. Thanks everyone for the attachments!
>
> What it basically comes down to is:
> - The power supply needs to handle 115V or 230V, 35-watts, and can deliver
> +/- 12VDC and +5VDC.
>
> - Whatever replacement power supply I get, I'll have to get the correct
> pin-outs for the two internal power connections. Not a problem since the
> power supply has the wires nicely silkscreened onto the PCB.
>
>
> On Sun, Dec 22, 2013 at 2:26 AM, Bryan Villados <groink1_at_email.domain.hidden> wrote:
>
>> I have two Apple ProFile drives, both of which have the 115/230V power
>> supplies. Both have blown the same capacitor - the 0.1 microfarad capacitor.
>>
>> Rather than trying to replace all the caps in these power supplies, I'm
>> hoping that there are more modern power supplies out there that I could use
>> to replace the Apple ProFile power supplies. I'm looking for one that can
>> fit internally, and should be able to fit in the same power supply cabinet
>> as the original, as the controller board mounts on top of the power
>> supply's chassis.
>>
>> The power supply supplies +5VDC and +/-12VDC. There are two power
>> connectors: one connects to the hard disk drive, and the other connects to
>> the controller board. Reading the service manual, the power cable that
>> connects to the controller board is used so that the controller board can
>> detect loss of power, so that it minimize data loss that might have been
>> still stored in the controller board's memory.
>>
>> Thanks!
>>
>
>

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