Options Dead M7332 45W power adapter

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stuie_norris@yahoo.com.au - 25 Sep 2005 03:58 GMT

Hi Group,

Just tried to power up my old 400 Mhz G3 laptop to retreive some data
and discovered that the power supply is no longer charging the
computer. Assume I must have damaged the adapter recently when my kid
tripped over it.

Firstly can I test the power supply some how with a volt meter?
(I tried to test and all reading were zero. Also tried to test working
65W model again zero.)

I have a G4 15 inch laptop with a 65W power supply. Is there any way I
can use this via an adpater to charge the older model powerbook or do I
need to purchase a new 45W power supply?

Any suggestions on options most welecome.

Stuart.

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John Johnson - 25 Sep 2005 06:43 GMT

> Hi Group,
>
[quoted text clipped - 6 lines]
> (I tried to test and all reading were zero. Also tried to test working
> 65W model again zero.)

Be more specific about what tests you performed. Note that the output of
your power supply is DC, not AC. If you've got your meter set on the
wrong range, you won't see anything. The power supply itself should be
marked for output voltage. Note that you cannot measure current unless
there's a load on the supply.

> I have a G4 15 inch laptop with a 65W power supply. Is there any way I
> can use this via an adpater to charge the older model powerbook or do I
> need to purchase a new 45W power supply?

AFAIK, there's no adapter from the smaller (newer) connector to the
larger (older) one. Otherwise, there is no problem using a higher-rated
supply on the device. I'd look at eBay and other sources of used
components (I've got an UFO-style supply I'd be willing to sell, buried
in some box somewhere, I think) before buying a new supply.

> Any suggestions on options most welecome.
>
> Stuart.

Signature

Later,
John

johajohn@indianahoosiers.edu

'indiana' is a 'nolnn' and 'hoosier' is a 'solkk'. Indiana doesn't solkk.

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KLK - 26 Sep 2005 04:31 GMT

Yes you can test the adapter with a voltmeter; if you have a
steady hand. The first ring, the one near the tip is negative
and the inner ring should be 24 volts. The trick is to make
contact with the rings, both of which are buried inside the
sleeve, without shorting them together. Remember the sleeve
and the tip are NOT connected to the power supply but they will
short your test probes.

As for checking the adapter, I would start with the cords. Both
the AC power and DC (the one to the machine) cords will break.
(copper work hardens) The adapters themselves seem to be quite
resistant to accidents.

KLK

> Hi Group,
>
[quoted text clipped - 11 lines]
>
> Stuart.

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Mac Forum / General / Portable Macs / September 2005

Options Dead M7332 45W power adapter