Philips M3015A - Page 184

Part 1 Troubleshooting Checklists
168
Troubleshootin
g
the Instrument
Troubleshooting the Front-Panel LEDs
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.