To Troubeshoot Power Problems - Agilent Technologies 16900A Service Manual

5
Troubleshooting

To troubeshoot power problems

38
The power LEDs on the frame help to figure out why a frame has
powered itself down. For safety purposes, when any of these LEDs
are lit the frame will not power back up until the power cord has
been disconnected and then reconnected.
The colors indicate:
• Green - 500 W power supply failure.
• Yellow - 700 W power supply failure.
• Red - fan failure or 'overtemp'.
If the system warns you it is powering down before it powers
down, it is a fan/overtemp problem. If it just powers down, it is a
power supply problem
On the 16900A and 16902A frames, if the lights do not come on
and if the system powers up momentarily when you plug it in,
make sure the power buttons haven't become jammed or stuck in
the pushed in position.
1 Turn off the instrument using one of the methods
descirbed in "To power off the system"
Disconnect the power cord, move the instrument to a
2
static safe work environment, then remove the cover
on page 48
16900A, 16902A, and 16903A Service Guide
View
LEDs
through
these
holes
Internal
location