S331L MM PN: 10580-00323 Rev. B 5-1
Chapter 5 — Troubleshooting
5-1 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 S331L should
refer to the User Guide for troubleshooting help.
Only qualified Anritsu personnel should replace internal assemblies. Major subassemblies shown in Table 1-2,
“List of Replaceable Parts” on page 1-3 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.
Turn-on Problems
Unit cannot boot-up, no activity occurs when the On/Off key is pressed:
1. Batteries may be fully discharged. Confirm the batteries are installed into the unit and connect the AC to
DC converter (Anritsu part number 40-187-R) to the unit allowing the batteries to charge.
2. Battery may be the wrong type. Use only Anritsu approved battery packs. Some non-approved battery
packs will fit into the S331L, 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 including the SOM assembly.
Unit begins the boot process, but does not complete boot-up:
1. SOM has failed. Replace the SOM assembly.
2. Main PCB has failed. Replace the Main PCB including the SOM 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, Display/Audio Menu.
2. Verify the cable between the LCD and Main PCB is properly seated.
3. Replace the LCD and touch screen assembly.
4. The Main PCB has failed. Replace the Main PCB including the SOM assembly.
Boot-up Self Test fails:
1. Perform a Master Reset.
2. The Main PCB has failed. Replace the Main PCB including the SOM assembly.
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