Tektronix ECO8000 Series, Service Manual

Page: 73 / 106

Troubleshooting
Check the state of the
Power Supply module
LEDs
When the instrument is running, the power supply LEDs indicate the status of
the supplies, including the internal fans and which of the supplies is currently
powering the instrument.
If the instrument loses power from both supplies, the LEDs continue to provide
status to help troubleshoot the root of the problem. In this mode, the LEDs
fl ash
to conserve the power in the storage capacitor. Typically the LED fl ashing should
last for 10 minutes after the loss of power.
If both of the supplies are good, the system will use the supply that is con fi gured
to be the preferred (active) supply. If one power supply has a problem, the system
will switch to the other supply. If either supply can support the instrument load,
even if it has a non-fatal problem, the system will choose the best supply and
attempt to continue to operate.
The following table shows the states of the AC and DC LEDs on a Power Supply
module when the power is on.
Table 4-3: Power on LED states for a Power Supply module
Power Supply state AC LED state DC LED state
Normal, Active Green Green
Normal, Backup Green Dim Green
AC < 75 V, DC supply running Red Green
AC < 75 V, DC supply failed Red Red
AC OK, DC supply failed Green Red
Marginal Low or High DC, Active Orange
Marginal Low or High DC, Backup Yellow
Load Test Fail - Backup Red
Load Test Fail – Active Orange
Fan Fail - Active
Orange
Fan Fail - Backup Red
Supply not installed, AC present Green Off
Supply not installed, AC absent Off Off
ECO8000 Series Service Manual 4–5