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Old 22 October 2019, 10:58   #1
scu98rkr
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Measuring Voltage at Floppy Power connector

Hi

Could some one point me to a full guide or video on how to measure voltage at the floppy power connector.

And what it should be.

Ie
What I should set my multimeter to.
What way round should I point the red and black prongs.

What values I should be getting.

I've mangaged to test my power supply (I think).

Using this image.

http://www.ianstedman.co.uk/Amiga/am...power-plug.JPG

And Im getting 5.01 V and 11.80 V consistently.

Is 11.80V Ok ?

However why I go to test the floppy power connector I seem to be getting 12V where as I thought I should get ~5V ?

I did get 4.8V at one point but I cant seem to replicate.

Thanks roger
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Old 22 October 2019, 11:18   #2
GearCross
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You're getting 11.8V at the power connector? It doesn't seem too bad, at least for ATX standard between 11.4V and 12.6 is tolerable so, someone more experienced may chime in...

But if you have your system under load, it's normal for the voltage to drop a little.

To measure on the floppy, between Yellow and Black you should have about 12V, between Red and Black, 5V, both DC. An Amiga may use brown instead of yellow for the 12V rail.

Cheers
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Old 22 October 2019, 11:34   #3
scu98rkr
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"You're getting 11.8V at the power connector? It doesn't seem too bad,"

Ok thats good Cheers

"To measure on the floppy, between Yellow and Black you should have about 12V, between Red and Black, 5V, both DC. An Amiga may use brown instead of yellow for the 12V rail."

Thanks thats great info.

Ok yes I have on left brown , black , black, red on right ?Is that the right way round
? (Facing amiga as you would sit to type)

I put the Red multimeter lead to red / brown terminal ?
I put the Black to multimeter lead to any black terminal ?

With RED MM to BROWN TERMINAL (plus black to black) I get ~4.8V
with RED MM to RED TERMINAL (plus black to black) i get ~ 11.8V

Does any one know what voltage is required for a floppy / gotek with 4.8V or maybe less would I have problems ?

thanks Roger
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Old 22 October 2019, 13:12   #4
Daedalus
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4.8V is a little low but it should be fine. Any lower than that and you might expect some problems. The 12V rail is less critical, so don't worry about that. Don't pay too much attention to the colours of the wires - Commodore used different colours in different models, and they tended to not stick to the PC standard colour scheme.

To see the pin positions, the amigapcb.org website is excellent.
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Old 22 October 2019, 14:29   #5
scu98rkr
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"4.8V is a little low but it should be fine. Any lower than that and you might expect some problems"

ok thats what I wanted to know

good info
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