Receiver Troubleshooting - Daniels VR-4E150-00-000 Instruction Manual

R E C E Iv E R tR o u Bl E SH oo tIn G
The receiver is composed of four main components; the receiver mainboard, the synthesizer module,
the RF Preselector and the universal daughter board (UDB). An optional decryption module can be
installed in the receiver.
The following steps will help you determine the most likely sub-assembly that contains a fault and
may help you determine why the fault is occurring.
NOTE: The sub-assembly or the entire receiver can be sent back to Daniels Service section for
repair. Contact Daniels Service section before returning any product.
Before testing, the receiver should be in the subrack or connected to the subrack by means of an
Extender Card or kit. The main power to the system (+13.8 VDC) and the +9.5 VDC regulated supply
should be checked via the front panel of the system regulator.
testing the Receiver
1. Flip the receiver front panel ON/OFF switch from the OFF position to the NORM position.
2. Check that the two front panel LEDs both turn ON for less than five seconds and then turn OFF.
If this is not the case, the most likely fault is on the UDB, on the synthesizer, or on the receiver mainboard.
Make sure that the UDB and the synthesizer module are properly seated on the receiver mainboard.
3. Connect the receiver to the PC with the USB cable and run the Radio Service Software (RSS).
4. Select [P25 or Analog] Receiver.
5. Click Configure.
6. Click Read to read the receiver configuration.
If the RSS returns "Device Not Responding," physically inspect the USB cable and connection, check the
Daniels USB driver and check that the USB is recognized by the Device Manager. If the RSS still does not
recognize the connection, the most likely fault is on the UDB.
7. Click Rx ID.
8. Click Read to read the Receiver ID.
Confirm that the Frequency Band in the Synthesizer ID Model Number matches the Frequency Band in
the Receiver Global Settings. If the settings do not match, the synthesizer will require replacement or the
programming will need to be changed to match the synthesizer hardware.
If the receiver is still not functioning properly, the module level check should be conducted in the
following order.
VHF & UHF Hardware Tuning and Troubleshooting
MT-4E VHF & UHF Receiver & Transmitter Instruction Manual
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IM08-MT-4E-TXRX-P1162