[Coco] MM/1 RTC RIP

[Dave R in Illinois]

I forgot to add I dremeled 2 small slits on the side, like the 2nd photo on
the link you provided. The leads were then held by the eeprom/ic socket for
soldering them onto the rtc new contacts you just dremeled. They fit
perfectly with the 2 gaps on that side missing pins. I  then slightly bent
the 90 deg header pins, ½ way into the horizontal side of header pin, enough
to provide a nice fit. I then followed up by soldering them on and covering
the pins with JB Weld. I used an older style remote RTC battery, with the 2
wire lead, and used Velcro to attach it inside the case. 

 

Dave

 

  _____  

From: Dave R in Illinois [mailto:lazyhand at sbcglobal.net] 
Sent: Thursday, January 24, 2008 8:03 PM
To: coco at maltedmedia.com
Subject: [Coco] MM/1 RTC RIP

 

Funny you mention this, I just did a similar rework on my IBM AT. What I did
was de-solder the RTC completely, fitted a socket, and cut off the battery
pins off the rtc. I think made 2 leads for power coming off the socket with
90 deg bent brass pins. WORKS GREAT!

 

I found to dremel apart the damn RTC is a pita, and working with any chip
still attached to a board is a big no no for static electricity in my book.
Best to de-solder it and rework it from there. 

 

Its pretty straight forward, and took me 10 minutes or so to complete.

 

Dave

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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: 
http://www.mcamafia.de/mcapage0/dsrework.htm 

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?