Lenovo ThinkPad R50 Hardware Maintenance Manual (HMM) - Page 116
System, board, interposer, cover
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Removing and replacing a FRU 1200 System board, interposer card, and base cover For access, remove these FRUs, in order: v "1010 Battery pack" on page 67 v "1020 Ultrabay Enhanced device" on page 68 v "1030 Hard disk drive" on page 69 v "1040 DIMM (optional)" on page 71 v "1050 Keyboard" on page 72 v "1060 DIMM (standard)" on page 76 v "1070 Modem daughter card (MDC/MDC-2)" on page 77 v "1080 Bluetooth/Modem daughter card (BMDC/BMDC-2)" on page 79 v "1090 Keyboard bezel" on page 81 v "1100 Mini PCI adapter" on page 85 v "1110 Fan assembly" on page 89 v "1120 CPU" on page 90 v "1130 Backup battery" on page 91 v "1140 Speaker assembly" on page 92 v "1150 IEEE 1394 cable" on page 94 v "1160 PC Card slots assembly" on page 97 v "1170 Ultrabay Enhanced shield kit" on page 98 v "1180 LCD assembly" on page 105 v "1190 VGA and Ultrabay Enhanced device eject button cable" on page 109 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) 112 R50/R50p, R51 Series