User Manual

MT-4E VHF & UHF Receiver & Transmitter Instruction Manual

IM08-MT-4E-TXRX Project 1106

Hardware Tuning and Troubleshooting

RECEIVER TROUBLESHOOTING

The receiver is composed of 4 main components; the Receiver Main Board, the Synthesizer Module,

the RF Preselector, and the Universal Daughter Board (UDB). An optional Decryption Board can be

installed in the Receiver.

These steps will help you determine the most likely sub-assembly that contains a fault, and may help

you determine what that fault is. 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, and 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.

Complete Receiver

Flip the receiver front panel ON/OFF switch from the OFF position to the NORM position and check

that the two front panel LEDs both turn ON for less than 5 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 Main Board. At

this stage make sure that the UDB and the synthesizer module are properly seated on the Receiver

Main Board.

Connect the Receiver to the PC with the USB cable and run the Radio Service Software (RSS).

Select (P25 or Analog) Receiver, click on Congure, then click on Read to read the Receiver

conguration. 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.

Click on Rx ID, then click on Read to read the Receiver ID. Conrm 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 still is not functioning properly the module level check should be conducted in the

following order: