ML248xx, ML249xA MM PN: 13000-00164 Rev. K 5-1
Chapter 5 — Troubleshooting
5-1 Introduction
Anristu strongly recommends that power meter repair be performed by qualified technical personnel only. The
preferred service policy is exchange of the defective unit. This policy ensures minimum downtime for the
customer. Only when unit exchange is not possible should the fault finding and repair work detailed below be
used. Refer to Section 1-9 in Chapter 1 for a listing of spare parts mentioned in this chapter. Contact your
nearest Anritsu Customer Service or Sales center for price and availability information.
The procedures in this chapter suggest the most likely remedies in a logical order of severity. It is best to follow
the steps as presented in order to properly isolate the fault. Refer to the power meter Operation Manual for the
specific operating instructions referred to in these procedures. Refer to Chapter 6 for specific module removal
and replacement instructions.
5-2 Front Panel and Display
The following procedures refer to possible faults with the power meter front panel and display.
Fault: No Display
Description
With the line power cable connected and the front panel on/off key pressed, there is no display on the
unit.
Recommended Action
1. Use the bootload method to load new software to the control PCB. Refer to Chapter 7, “Firmware
Updates” for instructions.
2. If the software will not load, replace the control PCB.
3. If the software will load but the front panel still does not operate, replace the front panel assembly.
4. If all the above does not fix the fault, replace the control PCB.
Fault: Keys Inoperable: Display On
Description
With the line power cable connected and the front panel on/off key pressed, there is a display on the unit
but the keys do not operate.
Recommended Action
Replace the front panel assembly
Fault: One or More Keys Inoperable: Display On and Operating
Description
Front panel display is working, but the buttons are not working. The front panel LCD operates normally
during start up and displays a normal measurement display, but one or all of the front panel buttons do
not work.
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