User guide

RFM-1000/1100 Technical Manual

Checking Voltage at DiSEqC Switch

If you are asked to check voltage at the DiSEqC Switch, this is the procedure to accomplish the task.

1. Turn the power to your controller OFF.

2. Disconnect the coax going to the receiver.

3. Place all dip switches on the back of your controller to the "DOWN" position.

4. From the back of the controller marked "Antenna" connect a coax to the base of the mount to the

small coax that is "unmarked, black or white"

5. Disconnect the Yellow and Red coaxes from the LNB's. Note: these two (2) coaxes come directly

from the DiSEqC switch.

6. Place your Multi-Meter on 20 Volts DC.

7. Turn ON the power to your controller.

8. Press SEARCH to start the switch check, wait approx 10 seconds before continuing.

9. The LED display will display "Testing SW1 or SW2" (SW1 is the LNB, SW2 is the vGPS) and will

begin to alternately supplying and switching 13/18 DC Volts to one coax and then do the same on

the other. Voltage will read around 12+ or 17+ volts.

10. Carefully check the voltage switching by placing one of your probes on the center conductor and

the other on the outside of the connector on one coax and then check the other in the same manner.

Care should be taken to not create a short during this process. Creating a short will give you a false

reading and will cause you to think you have a DiSEqC switch problem.

11. If you should accidentally short the cable during this procedure you will need to restart your

controller and do it again. It will not harm the controller or the switch, but be careful.

12. If you do not have voltage present on both the LNB and vGPS during this test then YOU HAVE A

BAD DiSEqC SWITCH and it will need to be replace.

What can cause a DiSEqC failure?

1. A shorted cable going from the switch to the LNB or vGPS.

2. Input voltage greater than 21 Volts DC so do not use a 29 Volt Power Inserter from DirecTV. If

you have a RFM-4100 SWM system a 21 Volt Power Inserter is required.

3. An open cable from the switch to the controller will not allow the switch to work properly.

4. Connecting coax while receiver is sending voltage to the LNB and causing a short.