Change Battery On Indigo R4K

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THE INDIGO BATTERY FAQ V1.01
Last modified: 10. January 2004 (V1.00 -> V1.01)
Maintained by: mail@g-lenerz.de
URL: http://www.g-lenerz.de/sgistuff/documents/indigo-battery-faq.txt

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Index
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Index 

Part 1: General
   1.1  Signs of battery failure
   1.2  Effects of battery failure
   1.3  What to do
   1.4  Before you start
   
Part 2: Changing the battery
   2.1  Obtaining the battery
   2.2  On Indigo R3K Systems
   2.3  On Indigo R4K Systems
   2.4  When finished

Legal

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Part 1: Changeing the battery
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1.1 Signs of battery failure
   
   When the onboard battery of the Indigo fails while the machine is 
   running nothing happens until the next time the machine is shut 
   down and then switched on again.
   
   When the battery is empty the Indigo refuses to boot. It constantly 
   repeats the following error message:
   
   Initializing tod clock.
   setting secs=0 min=0 hour=0 day=1 month=1 year=0
   Can't set tod clock.
   
1.2 Effects of battery failure
  
   The Indigo does not boot until it has a new battery. After that the 
   date/time is wrong but aside from that nothing really bad happens
   (usually). Other systems as for example old Sun Sparcstations (IPC
   or IPX) forget important data like the ethernet MAC adress when 
   the battery in their NVRAM fails. 

1.3 What to do

   The solution to the battery problems is the same as on a cheap 
   flashlight: Replace the old battery with a new one. Sounds easy
   but it is slightliy more difficult. 
   
   On both types of Indigos (R3K and R4K - see Indigo Versions FAQ for
   details) the battery is located on the CPU board. In the R3K Indigo 
   it is put in a "socket", in the R4K models it is soldered in place.

1.4 Before you start

   Before describing the procedure in detail it is time to adress the 
   reader (especially the ones who have to work on an R4K Indigo).
   
   Begin your work only if you know what you are doing and you have 
   the right tools at hand. If you are not sure or have no experience 
   at all in working on electronic equipment please ask someone 
   experienced to help you. Although the procedure is not that 
   difficult there is a chance to do real damage to the computer.
   
   The descriptions won't mention how to take the parts out of the 
   Indigo and how they are placed back in. There are good descriptions
   in the Indigo Owners guide for that. Read the appropriate sections
   carefully!
   
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Part 2: Changing the battery
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2.1 Obtaining the Battery

   The battery type used in the Indigo R4000 systems is a Tadiran 
   TL-5186 (the one on R3000 systems looks the same and maybe is as 
   well a TL-5186). A battery with the same dimensions and technical
   data is a Sonnenschein SL-340 which might be easier to obtain in
   some places (Austria, Germany, Netherlands and maybe Europe in 
   general).

2.2 On Indigo R3K Systems
    
   Changing the battery on R3K systems is pretty simple. The battery 
   is on the right side of the board close to its edge hidden below the 
   dummy that can be replaced with a GIO card. After removing the dummy 
   the old battery can be taken out of its "socket" and be replaced by 
   a new one. The "socket" is actually only a small rubber strap that 
   holds the battery in place. 

   Attention! Make sure that you do NOT insert the battery the wrong
   way. This may cause damage to the mainboard and leave you with a
   dead system.
    
2.3 On Indigo R4K Systems
   
   The situation on R4K Indigos is a bit more complicated. The battery 
   is located on the CPU board right below the CPU module but it is 
   soldered in place. It is not too difficult to find the pins from 
   the battery on the back of the board.

   The procedure itself is pretty obvious and not too difficult with 
   the right tools and a second person that helps holding the board 
   and pulls on the battery while the first works with the desoldering 
   tools and pays attention that no parts get damaged, burned or 
   whatever bad can happen. Clean the soldering points after the 
   battery has been removed and solder the new one in place.

   Attention! Make sure that you do NOT insert the battery the wrong
   way. This may cause damage to the mainboard and leave you with a
   dead system.
   
       
2.4 When finished

   When booting the Indigo for the first time after replacing the 
   battery enter maintenance mode and go into the PROM monitor. Set 
   the clock and boot the machine. Everything should work fine now.

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Legal
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   The entire document is an unofficial resource written by SGI users 
   for other SGI users. All information is presented AS IS and comes 
   without any warranties (although there should be no big mistakes)
   The trademarks used herein are property of Silicon Graphics, Inc. 
   (SGI) or Mips Technologies, Inc.
   
   Permission granted to distribute this document on Usenet, Internet 
   or other nets in two cases:
   1) As a complete document including its header and this legal note.
   2) Parts of it including proper citatation (i.e. Title and URL)


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