Panasonic 72 Service Manual - Page 14

Power-On Self Test Boot Check - memory

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5 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.) (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. 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.

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5
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:
= long sound (about 0.4 sec.),
= short sound (about 0.2 sec.), Length between sounds is about 0.1 sec.
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.
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