Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 165
Front Panel Assembly
Troubleshooting
If any of the LEDs are not behaving as described, proceed to the next
section to verify that the A6A1 Front Panel Interface board has the correct
power supply voltages.
Supply Voltages
There are only two instrument DC power supply voltages used by the A6A1
Front Panel Interface board. They are +5.0 VD and +3.3 VD. These are then split
and filtered to provide a total of five different power supply voltages on the
board itself. These voltages are listed in Table 7-4.
1. Referring to Figure 7-3, measure the supply voltage levels on both sides of
the inductors indicated in Table 7-4.
2. If the voltages on both sides of the inductors are at the expected level the
power supply voltages are not the problem. Replace the A6A1 Front Panel
Interface board.
If the power supply voltage does not meet the expected level on only one
side of any of the inductors, replace the A6A1 Front Panel Interface board.
If the power supply voltage does not meet the expected level on both
sides of any inductor, inspect the ribbon cable W1 that connects to J10 of
the board. If the cable is good see the “Power Supply Status Quick-Check”
in Chapter 8, “Power Supply,” to determine why the power supply voltage
is not present.
Table 7-4 A6A1 Power Supply Voltage Levels
Instrument
Voltage
A6A1 Supply Voltage Measurement
Location
Expected Level
(+/-10%)
+5.0 VD USB Power L6 +3.3 V
Display Backlight Control L2 +5.0 V
+3.3 VD USB Hub, CPLD, LVDS, Header, Interrupt L7 +3.3 V
LCD Power L1 +3.3 V
Keypad Controller L5 +3.3 V
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