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Philips M3001A Service Manual Page 188

M3/m4 monitors,measurement server,measurement server extensions.
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Part 1 Troubleshooting Checklists
Troubleshooting the Measurement Server LEDs
The Measurement Server LEDs can be seen from the rear view of the Instrument.
Yellow
Green
The functions of the three LEDs in the Server are identical to the three LEDs on the
Instrument System Board:
LED
Green
Yel-
low
Red
172
Measurement Server LEDs
.
Red
. . .
.
.
Description
+5V power LED—When on, this
LEd indicates the presence of +5V.
Main CPU status LED—When on
and blinking, this LED indicates
normal CPU operation.
Starts to blink 2 times per second
after the red Error LED switches
off then slows down to blink 1 time
per second after the red Error LED
switches off when the system boot
has finished (approximately 2 sec-
onds).
Error LED—When on, this LED
indicates an error.
This LED switches on for about 1
second after a System Board reset
then switches off.
Defect Condition
Off: Check Power Supply
and associated cabling.
Go to the troubleshooting
section.
If permanently on or off,
indicates a hung CPU.
- Reload software
- Exchange system board.
If permanently on, the
Server is probably defec-
tive.
Troubleshooting the Instrument

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