Panasonic CF-73SCUTSBM Service Manual - Page 15

Power-On Self Test (Boot Check

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7 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. z Start Test begins automatically when power switch is set to ON. z 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.) (1 (long sound) -2-3-4) = long sound (about 0.4 sec.), = short sound (about 0.2 sec.), Length between sounds is about 0.1 sec. z Table of errors classified by beep sounds Diagnosis Main board 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 Error message BIOS ROM error BIOS ROM error RAM error Keyboard controller error RAM error RAM error RAM error BIOS ROM error Occurrence of unexpected offering (Note) A beep sound is also issued in case of other I/O trouble. 12

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7 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.
z
Start
.............
Test begins automatically when power switch is set to ON.
z
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:
= long sound (about 0.4 sec.),
= short sound (about 0.2 sec.), Length between sounds is about 0.1 sec.
z
Table of errors classified by beep sounds
(1 (long sound) -2-3-4)
(Length of bar shows length of sound.)
Diagnosis
Beep signal sound
Error message
1(long sound)-2
BIOS ROM error
BIOS ROM error
RAM error
Keyboard controller error
RAM error
RAM error
RAM error
1-2-2-3
1-3-1-1
1-3-1-3
1-3-4-1
1-3-4-3
1-4-1-1
BIOS ROM error
2-1-2-3
Occurrence of unexpected offering
2-2-3-1
Main board
(Note)
A beep sound is also issued in case of other I/O trouble.
12