Panasonic CF-72 Service Manual ▷ View online
4 - 1
4.
Diagnosis Procedure
4.1.
Basic Procedures
The basic procedures for diagnosis, disassembly, and test of defective parts of a set to be repaired are summarized below. For
details, refer to relevant pages in the Service Manual.
l
l
l
l
l Flow Chart
Power On Self Test
OCCURRENCE OF
TROUBLE
TROUBLE
Automatic diagnosis takes
place when the power switch
is set to ON.
place when the power switch
is set to ON.
Power sw is set to ON.
POST NORMAL
FINISH
FINISH
POST ERROR
OCCURRENCE
OCCURRENCE
DEFECTIVE PARTS
SORTING
SORTING
SELF-DIAGNOSIS TEST (IF REQUIRED)
Conduct a self diagnosis test when
it is necessary for conduct
trouble diagnosis.
Conduct a self diagnosis test when
it is necessary for conduct
trouble diagnosis.
TROUBLESHOOTING
Defective parts are sorted by
referring to symptoms.
Defective parts are sorted by
referring to symptoms.
SELF-DIAGNOSIS TEST
After repair, conduct a self-
diagnosis test and make sure that the
repaired set operates properly.
After repair, conduct a self-
diagnosis test and make sure that the
repaired set operates properly.
DISASSEMBLY PROCEDURE
Replace defective parts.
Replace defective parts.
REPAIR WORK
INSPECTION
TEST FAILED
TEST OK
END OF
REPAIR WORK
REPAIR WORK
4 - 2
4.2.
Power-On Self Test (Boot Check)
4.2.1.
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.
beep sound or error code.
l Start .............Test begins automatically when power switch is set to ON.
l 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.)
4.2.2.
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.
l 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.
4 - 3
4.3.
List of Error Codes
The following is a list of the messages that BIOS can display. Most of them occur during POST. Some of them display informa-tion
about a hardware device, e.g., the amount of memory installed. Others may indicate a problem with a device, such as the way
it has been configured. Following the list are explanations of the messages and remedies for reported problems.
If your system displays one of except the messages marked below with an asterisk (*), write down the message and contact
Panasonic Technical Support. If your system fails after you make changes in the Setup menus, reset the computer, enter Setup and
install Setup defaults or correct the error.
0200 Failure Fixed Disk
Fixed disk in not working or not configured properly. Check to see if fixed disk is attached properly. Run Setup. Find out
if the fixed-disk type is correctly identified.
0210 Stuck key
Stuck key on keyboard.
0211 Keyboard error
Keyboard not working.
0212 Keyboard Controller Failed
Keyboard controller failed test. May require replacing keyboard controller.
0213 Keyboard locked - Unlock key switch
Unlock the system to proceed.
0230 System RAM Failed at offset :
nnnn
System RAM failed at offset
nnnn of in the 64k block at which the error was detected.
0231 Shadow RAM Failed at offset :
nnnn
Shadow RAM failed at offset
nnnn of the 64k block at which the error was detected.
0232 Extended RAM Failed at offset :
nnnn
Extended memory not working or not configured properly at offset
nnnn.
0250 System battery is dead - Replace and run SETUP
The CMOS clock battery indicator shows the battery is dead. Replace the battery and run Setup to reconfigure the system.
*0251 System CMOS checksum bad - Default configuration used
System CMOS has been corrupted or modified incorrectly, perhaps by an application program that changes data
stored in CMOS. The BIOS installed Default SETUP Values. If you do not want these values, enter Setup and enter your
own values. If the error persists, check the system battery or contact Panasonic Technical Support.
0260 System timer error
The timer test failed. Requires repair of system board.
0270 Real time clock error
Real-time clock fails BIOS test. May require board repair.
*0280 Previous boot incomplete - Default configuration used
Previous POST did not complete successfully. POST loads default values and offers to run Setup. If the failure was caused
by incorrect values and they are not corrected, the next boot will likely fail. On systems with control of wait states, improper
Setup settings can also terminate POST and cause this error on the next boot. Run Setup and verify that the wait-state
configuration is correct. This error is cleared the next time the system is booted.
0281 Memory Size found by POST differed from EISA CMOS
Memory size found by POST differed from EISA CMOS.
02B0 Diskette drive A error
02B1 Diskette drive B error
Drive A: or B: is present but fails the BIOS POST diskette tests. Check to see that the drive is defined with the proper
diskette type in Setup and that the diskette drive is attached correctly.
02B2 Incorrect Drive A type - run SETUP
Type of floppy drive A: not correctly identified in Setup.
02B3 Incorrect Drive B type - run SETUP
Type of floppy drive B: not correctly identified in Setup.
4 - 4
02D0 System cache error - Cache disabled
Contact Panasonic Technical Support.
02F0: CPU ID:
CPU socket number for Multi-Processor error.
02F4: EISA CMOS not writable
ServerBIOS2 test error: Cannot write to EISA CMOS.
02F5: DMA Test Failed
ServerBIOS2 test error: Cannot write to extended DMA (Direct Memory Access) registers.
02F6: Software NMI Failed
ServerBIOS2 test error: Cannot generate software NMI (Non-Maskable Interrupt).
02F7: Fail - Safe Timer NMI Failed
ServerBIOS2 test error: Fail-Safe Timer takes too long.
device address Conflict
Address conflict for specified
device.
Allocation Error for:
device
Run ISA or EISA Configuration Utility to resolve resource conflict for the specified
device.
Failing Bits :
nnnn
The hex number
nnnn is a map of the bits at the RAM address which failed the memory test. Each 1 (one) in the map
indicates a failed bit. See error 230,231 or 232 for offset address of the failure in System, Extended or Shadow memory.
Invalid System Configuration Data
Problem with NVRAM (CMOS) data.
I/O device IRQ conflict
I/O device IRQ conflict error.
Operating System not found
Operating system cannot be located on either drive A: or drive C:. Enter Setup and see if fixed disk and drive A: are properly
identified.
Parity Check 1
nnnn
Parity error found in the system bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the
address, it displays ????. Parity is a method for checking errors in binary data. A parity error indicates that some data has
been corrupted.
Parity Check 2
nnnn
Parity error found in the I/O bus. BIOS attempts to locate the address and display it on the screen. If it cannot locate the
address, it displays ????.
Press <F1> to resume, <F2> to Setup
Displayed after any recoverable error message. Press <F1> to start the boot process or <F2> to enter a Setup and change the
settings. Write down and follow the information shown on the screen.
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