Overcurrent Leds Are On (Amber); Front Panel Active And Port Status Led - Keysight Technologies N5261A User's And Service Manual

Service Information

Overcurrent LEDs are On (Amber)

1. Remove all millimeter module connections from the front panel. If the over
2. Verify that the +12 Vdc on the front panel DC Power connectors is not
3. Move the DC Power board ribbon cable to the Source/Receiver Status LED

Front Panel Active and Port Status LED

Front Panel R and S Indicator LED check. If the LED indicators are not
operating, verify the ribbon cable connection and ensure the rear panel test set
interface cable is connected securely. Proceed to the next section for further
troubleshooting before replacing the front panel board.
1. Connect the Test Set I/O cable (N4011-21002) from the analyzer to the
2. Using the I/O command values, confirm the correct address and data
3. Front Panel R and S indicator LED Check.
Keysight N5261/62A User's & Service Guide
current LEDs are off, suspect the millimeter module or the DC Power Bias
cable. If the LEDs are on continue with
shorted to ground. Refer to
on page 50. If it is shorted to ground, replace the front panel DC Power
cable (N5652-60001) or the DC Power Board (N5261-60002). If it is not
shorted to ground continue to
board, if the over current LEDs are still on replace the DC Power Board
(N5261-60002). If the LEDs are off replace the DC Power LED Board
(N5261-60005).
test set.
values are used, refer to
a. Verify that at least three of the Controller Status LEDs, are on. Refer
to Figure 2-13 on page
b. If none are on remove the Switch Driver board and recheck, if still no
indication, replace the Controller board.
c. If the Controller Status LEDs and the front panel Active LED is on,
suspect the front panel LED board or the ribbon cable. Replace as
needed. You can move the ribbon cable connection to the DC power
board and verify if the problem is the Port Status LED board, or use
the ribbon cable from the DC power board to verify if the problem is
the ribbon cable.
.
step 2
"Part Replacement and Location Information"
.
step 3
Table 2-3 on page
76.
66.
65