MS20xxC MM PN: 10580-00307 Rev. D 8-1
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 subassemblies 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 de tune sensitive
RF circuits and will result in degraded instrument performance.
8-2 Turn-on Problems
Unit Cannot Boot Up (Battery Powered)
Unit cannot boot up, no activity occurs when the On/Off key is pressed:
1. If the unit can power on with external AC power adapter, the 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 MS202xC and MS203xC but they are electrically incompatible and will not charge
correctly.
3. On/Off switch may have damaged. Replace the rubber keypad Rubber Membrane.
4. Main PCB may have failed. Replace the Main PCB Assembly.
Unit Cannot Boot Up (AC Powered)
1. External AC power adapter may have failed or be the wrong type. Replace the external power adapter.
2. On/Off switch may have damaged. Replace the rubber keypad rubber Membrane.
3. 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. Reload firmware.
2. Main PCB may have failed. Replace the Main PCB Assembly.
Unit Boots with No Display
Unit produces a ding sound after a while, but with no display:
1. If the display is dim, then check the Brightness setting under the System Menu | System Options.
2. LCD may have failed. Replace the LCD Display Assembly.
Note
Run Master Software Tools on a PC to download the latest firmware and load the firmware to a blank
formatted USB memory stick, insert the USB memory stick to the USB A connector of the
VNA Master and then load the firmware via the USB port of the instrument.
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