42 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Boot Up and Initialization
Potential Problems During Boot Process
Green Power On Front Panel LED is Not Working
The power on LED is controlled by the +3.35 VD voltage line from the A1 Power
Supply. When the instrument is turned on by pressing the A6A3 front panel
power switch the +3.35 VDF line is routed through the A3 RF assembly to the
front panel through ribbon cable W1. If the green power on LED is not
functioning as expected, follow the procedure below to identify the problem.
This procedure assumes that the yellow Standby LED does turn on when the
AC power is connected to the rear panel of the instrument. If it doesn't, refer to
the “Yellow Standby Front Panel LED is Not Working” section before
proceeding.
If the instrument turns on and operates properly but the green Power On LED
does not work then all that will need to be done is to trace where the control
signal for the LED is being lost.
1. The Power On LED will only turn on when the instrument is connected to
an AC power source that has a voltage level and frequency of that
specified for the instrument and the front panel On/Off button has been
pressed. Before proceeding verify that these requirements are being met.
Refer to the instrument rear panel for these requirements.
2. Turn the instrument off, remove the AC power cord, and then remove the
instrument outer and inner bottom cover. Refer to Chapter 15, “Assembly
Replacement” of this manual.
3. Connect the AC power cord to the rear of the instrument but without
turning it on, leaving it in standby mode.
4. Referring to Figure 2-3, press and release the front panel power switch
and verify that DS311 comes on.
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