Epson DM-M820, Техническое справочное руководство

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Rev. I Troubleshooting 8-3
MR Series Technical Reference Manual
MSR faults *1)
Printer unit faults
Serial port, parallel port, USB port, and keyboard / mouse port faults
Power supply faults
Faults that are difficult to diagnose
System Unable to Start
Power Supply Remains Off (Green Indicator Off (*)) and Display Screen is Blank
❏
Follow the procedures below.
1. Unplug the power cable. Leave it unplugged for about fifteen minutes; then plug it back
in and try to start it again.
2. Confirm whether the problem solves when replacing peripheral devices and turning on
the power supply.
3. If this does not solve the problem, there may be a faulty connection or malfunction in
one of the system’s units.
4. Test the power supply. (Refer to page 8-23.)
5. Replace the power switch assembly.
6. If the power supply is normal, refer to the section, “Possible Short in System,” on
page 8-17.
7. If the preceding steps fail to reveal the source of the problem, replace the main circuit
board and test if it is the solution.
(*): Note: The green indicator is a feature of the IM-800.
Error Beep Indicating a Fault Sounds During Start-up
❏
If an error beep indicating a fault sounds during start-up, follow the procedures below.
1. When you hear one long beep (*), the cause may be a memory problem. See “Memory
Error,” on page 8-7.
2. One long beep followed by two short beeps indicates a video error. Refer to the “Beep”
column in the section “POST Messages” on page 8-20.
(*): Note that a short beep sounds during normal system start up; this does not indicate an error.
Power Supply Indicator Comes on but the Display Screen Remains Blank
❏
If the short beep indicating normal start-up does not sound, follow the procedures below.
1. Check the video cable connections. (Check the cable for the DC outlet and video outlet.)
2. Confirm whether the power for the display is ON.