Chapter 8-Troubleshooting; Introduction; Turn-On Problems - Anritsu S412E Maintenance Manual

Chapter 8 — Troubleshooting
8-1

Introduction

This chapter describes the primary troubleshooting operations that can be performed. Perform the
troubleshooting suggestions in the order in which they are listed.
Only qualified service personnel should replace internal assemblies. Major sub-assemblies that are shown in
the replaceable parts list 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 RF shields will detune sensitive
RF circuits and will result in degraded instrument performance.
8-2

Turn-on Problems

Unit Cannot Boot Up
Unit cannot boot-up, no activity occurs when the On/Off key is pressed:
1. Battery may have been fully discharged. Use an external charger (Anritsu PN 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 S412E but they are electrically incompatible and will not charge correctly.
3. External AC to DC power adapter may have failed or be the wrong type. Replace the external power
adapter.
4. On/Off switch may have damaged. Replace the rubber keypad membrane and keypad PCB.
5. Main PCB may have failed. Replace the Main PCB Assembly.
Unit Cannot Complete Boot-Up
Unit begins the boot process, but does not complete boot-up:
1. Firmware update may not have completed. Attempt reloading the firmware using bootstrap mode. Enter
bootstrap mode by holding down the Shift - 4 - 0 keys while pressing the power on button. Plug a USB
memory, with the latest firmware, into the S412E. Press the Load All soft key.
2. During the boot up process the unit stops with the message: "Failed to load touchscreen calibration data.
Please reboot the instrument." Power the unit off and boot up in boot strap mode (hold down the Shift - 4
- 0 keys while pressing the power on button). In boot strap mode the unit will prompt you to perform a
touchscreen calibration, follow the directions on the screen until the touchscreen calibration is complete
and then power cycle the unit. Once the unit boots up, ensure the firmware version is 1.04 or greater. If
not, load the latest firmware and perform a touchscreen calibration.
3. Main/VNA PCB may have failed. Replace the Main/VNA PCB Assembly for S412E.
Unit Boots with No Display
Unit produces a ding sound after a while, but with no display:
1. If the display is dim, check the Brightness setting under the System Menu | System Options.
2. LCD Backlight Inverter PCB may have failed. Replace LCD Backlight Inverter PCB.
3. LCD may have failed. Replace the LCD Display Assembly.
4. The Main/VNA PCB may have failed. Replace the Main/VNA PCB Assembly for the S412E.
S412E MM PN: 10580-00324 Rev. N 8-1