Specifications

5 Troubleshooting
94 Series N6700 Service Guide
Front Panel Troubleshooting
Troubleshooting the front panel board involves checking for the
presence of the correct bias voltages on the board. Refer to the
following table and figure.
Test Point Location Voltage Action
TP 1
BKL_VCC
+12 V
If bias not present, troubleshoot the bias board or replace the front
panel board.
TP 2
P1 pin 3
+12 V
If backlight voltage not present, replace the front panel board.
If voltage is present and the display is not lit, replace the display.
Common GNDB Common
Bias Board Troubleshooting
Troubleshooting the bias board involves checking for the presence of
the correct bias voltages on the board. Refer to the following table
and figures.
Note that if the bias voltages at test points 2 - 4 in the following table
are not present, it could be caused by a defect in the power module
or interface board that is pulling the bias voltage low.
Test Point Location Voltage Action
TP 1 + RED +48 V Output of bulk supply. If not present, replace the bulk supply.
TP 2 + C4 +12 V If biases at TP 2, TP 3, or TP 4 are not present, disconnect the
backplane and interface board cable assemblies and recheck.
If biases are still not present, replace the bias board.
TP 3 U9 - 2 +5 V Same as above.
TP 4 + C3 +3.3 V Same as above.
Common − BLK Common