1200  System  board,  interposer  card, 
and  base  cover 
For  access,  remove  these  FRUs,  in  order: 
v  “1010  Battery  pack”  on  page  68 
v  “1020  Ultrabay  Enhanced  device”  on  page  69 
v  “1030  Hard  disk  drive”  on  page  70 
v  “1040  DIMM  (optional)”  on  page  72 
v  “1050  Keyboard”  on  page  73 
v  “1060  DIMM  (standard)”  on  page  77 
v  “1070  Modem  daughter  card  (MDC/MDC-2)”  on  page  78 
v  “1080  Bluetooth/Modem  daughter  card 
(BMDC/BMDC-2)”  on  page  80 
v  “1090  Keyboard  bezel”  on  page  82 
v  “1100  Mini  PCI  adapter”  on  page  86 
v  “1110  Fan  assembly”  on  page  90 
v  “1120  CPU”  on  page  91 
v  “1130  Backup  battery”  on  page  92 
v  “1140  Speaker  assembly”  on  page  93 
v  “1150  IEEE  1394  cable”  on  page  95 
v  “1160  PC  Card  slots  assembly”  on  page  98 
v  “1170  Ultrabay  Enhanced  shield  kit”  on  page  100 
v  “1180  LCD  assembly”  on  page  107 
v  “1190  VGA  and  Ultrabay  Enhanced  device  eject  button 
cable”  on  page  111 
Important  notice  for  handling  the  system  board: 
In  ThinkPad  R50  series,  the  security  chip  a  is  soldered 
on  the  underside  of  the  system  board  in  some  models  as 
in  this  figure. 
a
 
 
(continued) 
Removing  and  replacing  a  FRU  
114  R50/R50p,  R51  Series