Epson DM-M820, Техническое справочное руководство, Страница: 210 / 324

8-20 Troubleshooting Rev. I
POST Messages
The Power On Self-Test (POST) checks the system configuration and hardware when power is
turned on. If it detects any errors, it issues error messages and emits audible beeps. The
following section explains the error messages.
POST Messages
During the POST, the BIOS either sounds a beep code or displays a message when it detects a
correctable error. The following is a list of POST messages. An error message may be followed
by a prompt to press
F1 to continue or press DEL to enter setup
.
POST messages
Message Description
BEEP There are two kinds of beep in BIOS.
This code indicates that a video error has occurred and the BIOS cannot initialize the
video screen to display any additional information. This beep code consists of a single
long beep followed by two short beeps.
The other code indicates that memory error has occurred. This beep code consists of a
single long beep repeatedly.
BIOS ROM CHECKSUM
ERROR — SYSTEM HALTED. This message is displayed when the checksums of the BIOS ROM (F0000h to FFFFFh) do
not match.
Update the BIOS.
If the same error still occurs after updating the BIOS, there may be a malfunction of the
system ROM or main board. Try replacing these parts in turn to see if this solves the
problem.
CMOS BATTERY HAS FAILED This message is displayed when a problem occurs with the CMOS backup battery.
Replace the backup battery.
If the error message is still displayed after replacing the battery, there may be a
malfunction of the CMOS peripheral circuitry (including the chipset). Try replacing the
main board to see if this solves the problem.
CMOS CHECKSUM ERROR This message is displayed when the CMOS checksum and values do not match, such as
during a CMOS error when rewriting the BIOS or after long-term storage.
Execute Load Optimized Defaults in the BIOS setup utility to set the default settings and
make any necessary changes to the settings to see if this solves the problem.
DISK BOOT FAILURE, INSERT
SYSTEM DISK AND PRESS
ENTER This message is displayed when a start-up drive cannot be found after attempting a
start-up in the order of First Boot Device, Second Boot Device, Third Boot Device, and
Boot Other Device.
Try inserting a floppy disk, CD-ROM, or other removable disk into the corresponding drive,
or try reconnecting a start-up device and then restart the system.
If, after implementing these solutions, the system still does not start up, there may be a
malfunction of the main board, interface cable, or the drive itself. Try replacing these
parts in turn to see if this solves the problem.
DISKETTE DRIVES OR TYPES
MISMATCH ERROR — RUN
SETUP This message is displayed when the BIOS drive settings differ from the actual installed
devices.
Check to see if there is an error in the settings of the BIOS setup utility or an error in the
device connected.
If no problems were found, try replacing the main board or the drive in question to see if
this solves the problem.
DISPLAY SWITCH IS SET
INCORRECTLY DISPLAY TYPE HAS CHANGED SINCE LAST BOOT
These messages are not displayed on standard models.
If these messages are displayed, the system BIOS may be damaged or a function may
be extended by an application or other program.
Rewrite the BIOS or check to see if there is an extension from an application or other
program.