NEC MultiSync LCD1525V Service Manual page 54

1.3 Operation
• The operation should be performed according to the screen message.
• When the message of "Please set V. sync to 42Hz." is displayed, set the signal generator to the signal with
vertical synchronization frequency of 42Hz. When the message of "Please set V. sync to over 55Hz." is
displayed, set the signal generator to the signal whose vertical synchronization frequency is between 55Hz
and 25kHz.
• The message of "Normally Complete" means that writing of EDID data or PnP inspection completed normally.
The message of "Error" means that writing of EDID data or PnP inspection finished incorrectly.
• When the PnP inspection is completed, read EDID data would be displayed. And if the read EDID data
differed from the original EDID data, the different bytes would be displayed in red.
• For the details of error, see the messages displayed at the bottom right of the screen.
The meaning of the messages is shown on section 4.
• After writing of EDID data or inspection of DDC2B, monitor can not be communicated by DDC1.
In that case, turn off and on the monitor again, which will make the DDC1 communication test possible.
• Make sure that fixture's LED flashes on and off before writing EDID data, inspecting DDC1 and DDC2B. If
the fixture's LED does not flash on and off, turn off and turn on the monitor and the fixture.
1.4 Error Messages
• Start Bit Error
This message is displayed when the start bit is not "H" while sending data from PC to MPU on the fixture.
This error will be caused by noise etc. on the line.
• Command Error
This message is displayed when the different command is sent from PC to MPU on the fixture.
• Hardware Error
This message means that the PC does not recognize ACK command sent from the MPU on the fixture.
• File Open Error
This message means that the input EDID file name was wrong.
• Command line Switch Error
This message means that the input communication command is incorrect.
• Parity Error
This message is displayed when the MPU on the fixture recognized the parity bit is incorrect.
This error can be caused by noise etc. on the line.
• EDID Data Error
This message is displayed when the null bit is not detected in EDID data read by DDC1 communication.
• EDID Data Sort Error
This message is displayed when the header code is not detected in EDID data read by DDC1 communication.
• Time Out Error
This message is displayed when the PC does not recognize ACK commands sent from MPU within 10 msec
after the PC had sent communication command or EDID data.
If this error occurs, check the connection on PC, fixture and monitor.
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