[Coco] MM/1 RTC RIP
robert.gault at worldnet.att.net
Thu Jan 24 19:55:56 EST 2008
Bob Devries wrote:
> hello, MM/1 users (sorry for the bandwidth usage, you coco chaps)
> I just found out that the RTC chip in my MM/1 has died. Actually, it's
> not the chip, since setting the time will work until the next power
> down, so it's the battery. The MM/1 uses a Dallas DS1287 integrated
> clock/battery, *and* it is soldered into the IO board. GROAN.
> What to do?
> I did some googling and came across this:
> This will work, but I still need to desolder the clock chip, or at the
> very least do a *very* careful job of gringing the relavant parts. Sadly
> I don't own a dremel tool.
> Does anyone else have experience in this?
Perhaps you can do something analogous to shat I did with a Dallas
DS1216 clock. This was discussed here not too long ago.
I took a battery, attached two wires to it, and soldered the wires to
pins 4 and 8 on the clock chip. The clock then worked like new.
I don't know if any pins on the DS1287 go directly to the battery. On a
DS12885 (drop in replacement) there is a pin for an external battery. If
your battery is not completely dead, testing the DS1287 leads with a
voltmeter ought to find if there is a connection.
DS12885 V-Bat pin package type
20 SO PDIP
More information about the Coco