MS2720T MM PN: 10580-00342 Rev. D 6-1
Chapter 6 — Troubleshooting
6-1 Introduction
This chapter describes the primary troubleshooting operations that can be performed by all Anritsu Service
Centers. Perform the troubleshooting suggestions in the order they are listed. Operators of the Spectrum
Master MS2720T should refer to the User Guide for troubleshooting help.
Only qualified Anritsu personnel should replace internal assemblies. Major subassemblies shown in Table 1-4,
“List of Replaceable Parts” on page 1-5 are typically the items that may be replaced. Because they are highly
fragile, items that must be soldered may not be replaced without special training. Removal of RF shields from
PC boards or adjustment of screws on or near the shields will detune sensitive RF circuits and will result in
degraded instrument performance.
6-2 Turn-on Problems
Unit cannot boot-up, no activity occurs when the On/Off key is pressed:
1. Battery may be fully discharged. Use an external charger (Anritsu part number 2000-1374) to charge a
completely discharged battery.
2. Battery may be the wrong type. Use only Anritsu approved battery packs. Some non-approved battery
packs will fit into the MS272xC, but are electrically incompatible and will not charge correctly.
3. External power supply may have failed or be the wrong type. Replace the external power supply.
4. On/Off switch is damaged. Replace the keypad PCB or rubber keypad.
5. Main PCB has failed. Replace the Main PCB assembly.
Unit begins the boot process, but does not complete boot-up:
1. Boot up process gets stuck with “Application Running” on the bottom left hand corner, power the unit off
and press the Esc key while pressing the Power on switch. This performs a factory defaults restart.
2. Boot up process gets stuck at “Anritsu” splash screen, using Bootstrap mode and a USB memory device
prepared with the current instrument firmware, perform the Load All procedure.
3. During boot-up process, the instrument stops with the message: “Failed to load touch screen calibration
data. Please reboot the instrument”. Boot up the instrument in boot strap mode, the instrument will
prompt you to perform a touch screen calibration.
4. Main PCB has failed. Replace the Main PCB assembly.
Unit makes normal boot-up sounds, but the display has a problem:
1. If the display is dim, check the brightness setting under the System Menu / System Options.
2. Replace the LCD assembly.
3. The Main PCB has failed. Replace the Main PCB assembly.
Boot-up Self Test fails:
1. Perform a Master Reset. Be advised that a Master Reset will delete all user saved setups, jpgs and
measurement files, ensure you have backups of these before performing a Master Reset.
If the message relates to the RTC battery, replace the Main PCB.
2. The Main PCB has failed. Replace the Main PCB assembly
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