PC-Doctor. 21 21 21 23 23 23 26 28 32 33 34 35 39 41 43 45 47 48 49 49 52 53 53 54 55 55 56 56 57 59 60 61 ThinkPad T20, T21, T22 and T23 series. Product overview. Specifications. Status indicators. FRU Tests. Fn key combinations. Symptom-to-FRU index. Numeric error codes. Error messages. Beep symptoms. No-beep symptoms. LCD-related symptoms. Intermittent problems. Undetermined problems. FRU replacement notices. Screw notices. Retaining serial numbers. Removing and replacing a FRU. 1010 Battery pack. 1020 Backup battery. © Copyright IBM Corp. 2002 v 1030 Hard-disk drive. 1040 DIMM. 1050 Mini PCI adapter. 1060 Ethernet daughter card. 1070 Ultrabay 2000 device. 1080 Keyboard. 1090 Keyboard CRU insulator. 1100 Hinge cover. 1110 Keyboard bezel. 1120 Fan assembly. 1130 CPU. 1140 PC Card slot assembly. 1150 Speaker. 1160 Hard-disk bay. 1170 Ultrabay 2000 slot. 1180 System board. 1190 Secure chip. 1200 Microphone cable. 2010 LCD assembly. 2020 Front bezel. 2030 Inverter card. 2040 LCD panel. 2050 Antenna assembly. 2060 Sub card. 3010 ThinkPad Dock PCI cover. 3020 ThinkPad Dock top cover. Locations. Front view. Rear view. Bottom view...