General Information 1-4 Troubleshooting
MS2721B MM PN: 10580-00177 Rev. D 1-7
Turn-on Problems
Instrument cannot boot-up, no activity occurs when 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. Ensure that the battery has an Anritsu label.
3. External power supply may have failed or be the wrong type. Replace the external power supply, the AC
to DC Power Converter.
4. On/Off switch is damaged. Replace the keypad PCB or rubber keypad. Refer to “Main (Numeric) Keypad
Membrane and PCB Replacement” on page 4-9.
5. Main PCB has failed. Replace the Main PCB/Spectrum Analyzer assembly. Refer to “Removal of the
Main PCB/LCD Assembly” on page 4-6.
Instrument begins the boot process, but does not complete boot-up:
1. Using Master Software Tools, perform the Emergency Repair procedure, then update the system software
(via the Tools menu in Master Software Tools).
2. Main PCB has failed. Replace the Main PCB/Spectrum Analyzer assembly. Refer to “Removal of the
Main PCB/LCD Assembly” on page 4-6.
Instrument 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 Backlight Driver PCB. Refer to “Removal of the LCD and Backlight Driver PCB from the
Main PCB” on page 4-7.
3. Replace the LCD assembly. Refer to “Removal of the LCD and Backlight Driver PCB from the Main PCB”
on page 4-7.
4. Main PCB has failed. Replace the Main PCB/Spectrum Analyzer assembly. Refer to “Removal of the
Main PCB/LCD Assembly” on page 4-6.
Boot-up Self Test fails:
1. Perform a Master Reset.
2. If the message relates to the RTC battery, replace the battery on the Main PCB. Refer to “Main PCB Real
Time Clock (RTC) Battery Removal and Replacement” on page 4-8.
3. Main PCB has failed. Replace the Main PCB/Spectrum Analyzer assembly. Refer to “Removal of the
Main PCB/LCD Assembly” on page 4-6.
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