Power-On Self Test (Boot Check) - Panasonic TOUGHBOOK CF-18 Service Manual

2 Power-On Self Test (Boot Check)

Outline of POST
The set has a boot check function called POST (Power-On Self Test) in it. The condition of the main body is diagnosed by checking
beep sound or error code.
Start .............Test begins automatically when power switch is set to ON.
Normal finish .....After memory checking, a beep sound is issued once and the set is placed into automatic stop.
Note: If no error occurs, nothing is displayed. (No display of OK, etc.)
Error Diagnosis by Checking Beep Signal Sound
The beep sound is as follows:
(Length of bar shows length of sound.)
= long sound (about 0.4 sec.),
Table of errors classified by beep sounds
Diagnosis
Main board
(Note) A beep sound is also issued in case of other I/O trouble.
= short sound (about 0.2 sec.), Length between sounds is about 0.1 sec.
Beep signal sound
1(long sound)-2
1-2-2-3
1-3-1-1
1-3-1-3
1-3-4-1
1-3-4-3
1-4-1-1
2-1-2-3
2-2-3-1
(1 (long sound) -2-3-4)
BIOS ROM error
BIOS ROM error
RAM error
Keyboard controller error
RAM error
RAM error
RAM error
BIOS ROM error
Occurrence of unexpected offering
2-1
Error message