Philips M3001A Service Manual page 184

Part 1 Troubleshooting Checklists
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:
LED
On
Off/Standby
AC Power
Battery
• 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).
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Normal Operation
Green: The Monitor is
on.
Off: The Monitor is in
standby mode.
Green: The Monitor is
connected to the mains
power supply.
Green: The battery is
fully charged (>95%).
Yellow: The battery is
charging.
Red and blinking: The
battery is empty.
Defect Condition
The LED remains off: Suspect:
1. Monitor Bezel cable connec-
tion.
2. System Board
Go to the troubleshooting sec-
tion.
The LED remains off: Suspect:
1. Power Supply.
2. Monitor Bezel cable connec-
tion.
3. System Board.
Go to the troubleshooting sec-
tion.
Same as for AC Power condi-
tion.
Troubleshooting the Instrument