Troubleshooting receiver issues (SPS modular)

This section describes some possible receiver issues, possible causes, and how to solve them. Please read this section before you contact Technical Support.

The receiver does not turn on

Possible cause

Solution

External power is too low.

Check the charge on the external power supply, and check the fuse if applicable. If required, replace the battery.

Internal power is too low.

Do the following:

  • Check the charge on the internal batteries and replace if required.

  • Ensure battery contacts are clean.

External power is not properly connected.

Do the following:

  • Check that the Lemo connection is seated properly.

  • Check for broken or bent pins in the connector.

Faulty external power cable.

Do the following:

  • Try a different cable.

  • Check pinouts with multimeter to ensure internal wiring is intact.

The receiver is not tracking any satellites

Possible cause

Solution

The GNSS antenna does not have clear line of sight to the sky.

Ensure that the antenna has a clear line of sight.

The cable between the receiver and the GNSS antenna is damaged.

Replace the cable.

The cable connections at receiver or antenna are not tightly seated, or are connected incorrectly.

Check all cable connections.

The receiver does not log data

SPS351, SPS555H, SPS855, SPSx61 Modular receivers only.

Possible cause

Solution

Insufficient memory in the internal memory.

Delete old files using the GPS Configurator software, or press for 30 seconds.

The receiver is tracking fewer than four satellites.

  • Wait until the SV Tracking LED is flashing slowly. Use the SCS900 software.

  • Go to the SkyPlot screen and press Ctrl+M to access the current elevation mask settings. Reduce the mask value to make more satellites available.

  • The default mask setting for receiver is 10° above the horizon. Change the value to a lower setting temporarily while you are waiting for a better constellation availability.

The data logging option is not enabled.

Check the original purchase order or the receiver configuration using the WinFlash utility. If data logging is not enabled on the receiver, you can order the option from your local Trimble Site Positioning Systems dealer, and upgrade the receiver using the WinFlash utility.

The receiver SSID does not show up on the list of available Wi-Fi connections

SPS356 Modular receiver only.

The receiver does not have Wi-Fi Access Point mode enabled. Press the Power button for 15 seconds to reset the receiver.

The receiver is not responding

Possible cause

Solution

The receiver needs a soft reset.

Turn off the receiver and then turn it back on again.

The receiver needs a full reset.

Press for 30 seconds.

The receiver cannot be set up as a base station using the SCS900 software

SPS351, SPS555H, SPS855, SPSx61 Modular receivers only.

Possible cause

Solution

The SPS Modular receiver may have been purchased as a rover receiver rather than with the optional base station capability.

Ask your local dealer to check the Option Bit settings, else check the setting yourself using the WinFlash utility. If required, upgrade the receiver.