User`s guide

M3000A/M3046A/M3015A/M3016A Service Guide
Troubleshooting the Instrument 5-5
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When the Monitor is first switched on, all the front-panel LEDs and keys light up
momentarily. The meaning of the front-panel LEDs under normal operation is given in the
following table together with a brief summary of possible defect conditions:
• With the Instrument on, observe the following:
• The backlight tube lights the LCD display.
• No error messages are displayed. Error messages indicate either software or hardware fault
has occurred. If error messages are displayed, refer to error codes later in this chapter.
• The brightness of the LCD display is adequate. If not, adjust it accordingly.
• The green LED on the System Board is on (see the following section).
LED Normal Operation Defect Condition
On
Off/Standby
Green: The Monitor is on.
Off: The Monitor is in standby mode.
The LED remains off: Suspect:
1. Monitor Bezel cable connec-
tion.
2. System Board
Go to the troubleshooting sec-
tion.
AC Power Green: The Monitor is connected to the
mains power supply.
The LED remains off: Suspect:
1. Power Supply.
2. Monitor Bezel cable connec-
tion.
3. System Board.
Go to the troubleshooting sec-
tion.
Battery Green: The battery is fully charged
(>95%).
Yellow: The battery is charging.
Red and blinking: The battery is empty.
Same as for AC Power condi-
tion.