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Philips M3001A Service Manual Page 185

M3/m4 monitors,measurement server,measurement server extensions.
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Troubleshooting the System Board LEDs
Switch the Monitor off then on again to observe the System Board LEDs. These can be
viewed through the top left corner of the rear panel. (You need to remove the Server to view
these LEDs).
View (x3)
System Board
LEDs
The meaning of the System Board LEDs is given in the following table together with a brief
summary of possible defect conditions:
Troubleshooting the Instrument
LED
Description
Green
+5V power LED. When on, indi-
cates the presence of +5V.
Yel-
Main CPU status LED—When on
low
and blinking, this LED indicates
normal CPU operation.
This LED starts to blink 2 times per
second after the red Error LED
switches off then slows to blink 1
time per second after the red Error
LED switches off when the system
boot has finished (approximately 2
seconds).
Red
Error LED—When on, this LED
indicates an error.
This LED switches on for about 1
second after the System Board has
been reset then switches off.
Part 1 Troubleshooting Checklists
View (x1)
System Board
LED (ECG OUT)
Remove
Power Supply
Cover
Defect Condition
Off: Check Power Supply
and associated cabling.
If permanently on or off,
indicates a hung CPU.
- Reload software
- Exchange system board.
If permanently on, the Sys-
tem Board is probably
defective.
169

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