Checking The Led State - R&S 4200 Series Operating Manual

R&S XU 4200
4.1.2

Checking the LED State

Introduction
Indication
LED AC
not illuminated
LED DC
not illuminated
6166.5368.02.01
The LEDs on the front panel of the radio display the status of various
settings and operating modes. If the LEDs AC, DC, GO or VOP are not
illuminated, there are a number of possible reasons.
Fig. 4.1 Checking the LED state.
Possible cause of fault
With AC operation only:
If the secondary voltage of approx.
28 V is displayed (see chapter
3.4.7.4.3), LED AC is defective
With AC/DC operation only:
Mains connector not plugged in, no
mains voltage available
Fuse F1 or F2 in AC line input
defective
With AC/DC operation only:
Battery connector not plugged in or
no DC voltage available (or reversed
polarities)
Fuse F3 in DC line input defective
Return radio to our service center for
replacement
Plug in mains connector X1, check
mains voltage (see chapter
3.4.7.4.3)
Please replace the fuses with the
fuses listed in the appendix Fuses. If
the fuses get defective again after
the replacement, please send the
radio to our service center.
Plug in battery connector X3 and
check battery voltage (see chapter
3.4.7.4.3)
Please replace the fuses with the
fuses listed in the appendix Fuses. If
the fuses get defective again after
the replacement, please send the
radio to our service center.
4.2
Visual Inspection
Remedy