Lenovo ThinkPad 360 Hardware Maintenance Manual - Page 231

FRU Code 45 50 51 60 61 70 80 81 90 FRU/Action External CRT 1. Reseat the Drive (FDD-1) 2. Diskette Drive (FDD-1) 1. Reseat the Drive (FDD-2) 2. Diskette Drive (FDD-2) 1. Reseat the Hard Disk Drive (HDD-1) 2. Hard Disk Drive (HDD-1) 1. Reseat the Hard Disk Drive (HDD-2) 2. Hard Disk Drive (HDD-2) PCMCIA-2 (Replicator) Cellular Modem (370C, 750Ce, 755C, and 755Cs) Internal Modem Card Reserved Note: The device ID and error codes are used to indicate the detail portion of the FRU which caused the error. If replacing a FRU does not correct a problem, see the Device ID or error code from the previous failure. If they have changed, the cause might be because the new FRU is defective or that the FRU was incorrectly installed. If the problem remains after replacement of the FRUs, go to "Undetermined Problems" on page 227. Beep Symptoms Symptom/Error Continuous beeps. One beep and a blank, unreadable, or flashing LCD. One beep, and the message "Unable to access boot source." One long, two short beeps and a blank or unreadable LCD. One long beep followed by four short beeps each time the power switch is operated. (System cannot power-on due to low battery voltage.) One beep every second. (System is shutting down due to low battery voltage.) FRU/Action System Board 1. Reseat all LCD connectors. 2. LCD Assembly 3. System Board 4. DC/DC Card 1. Boot device 2. System Board 1. System Board 2. LCD Assembly Connect the AC Adapter or install a fully-charged battery. Connect the AC Adapter or install a fully-charged battery (allows system to complete shutdown before changing the battery). ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs 221