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Author Topic: Amiga 4000 rev D battery  (Read 1432 times)

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Offline AmigazTopic starter

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Amiga 4000 rev D battery
« on: March 07, 2010, 05:33:57 PM »
I'm about to use an external cmos battery on my A4000 Rev D motherboard but I've noticed the previous owner soldered a resistor between a couple of components near the original coin shaped battery when he soldered the wires to was hooked up to the external coin battery he had soldered to those wires.
You guys think this resistor will cause any issues or should I remove it?

Here's a couple of pics on which you can see where it's located:


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Amiga 4000T - A3640 '040
Amiga 4000 - CS MKIII
Amiga 1200 - Blizzard 1230 MKIV
Amiga 1200 - Stock
Amiga CD32 - TF360
A bunch of ol' A500's
 

Offline save2600

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Re: Amiga 4000 rev D battery
« Reply #1 on: March 07, 2010, 05:42:59 PM »
Not being an expert on the Revision 'D', I'd say yes - remove anything not original *if* it conflicts with that CMOS of yours. I see the circle, but did these really come with a coin styled battery and not a NiCad? Guy might have been thinking he'd limit the recharging current when he replaced the original with a coin shaped lithium.

I guess if it works the way you have it, I'd leave it then. Looks pretty clean, but perhaps traces are bad somewhere, which is another reason he added the resistor? Hard to tell.
 

Offline AmigazTopic starter

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Re: Amiga 4000 rev D battery
« Reply #2 on: March 07, 2010, 09:01:02 PM »
Just tested the external battery without removing the resistor...no smoke so far and the clock seem to hold the time just fine :-)
-------------------------------------------------------------------
Amiga 4000T - A3640 '040
Amiga 4000 - CS MKIII
Amiga 1200 - Blizzard 1230 MKIV
Amiga 1200 - Stock
Amiga CD32 - TF360
A bunch of ol' A500's