Nautel NV5LT Troubleshooting Manual

Contents

Nautel NV5LT Troubleshooting Manual Manual pdf 48 page image

NV5LT/NV3.5LT TROUBLESHOOTING MANUAL RESPONDING TO ALARMSPAGE 4.1.40 VERSION 3.3 2016-03-10RF Power Module ReplacementRemoving an RF Power Module1. Confirm the location of the RF power module that is being removed. Note the alarm text includes aModule number (1-2) that is not identified on the RF power module. See Figure 4.1.12 on page4.1.41 to determine the location for a given RF power module (1 - 2).2. Remove the front filter panel by loosening its eight (8) quarter-turn fasteners (see Figure 4.1.5 onpage 4.1.29) and lifting it out of its two bottom slots.3. Set the ENABLE/DISABLE switch on the front of the suspect RF power module to its DISABLE(down) position. This inhibits the module’s associated pair of power supply modules.4. Remove and retain the two M5 securing screws in the front of the module. If necessary, remove theM8 shipping screw in the back of the module (the shipping screws do not need to be reinstalled,and may have already been removed during installation or previous maintenance).5. Grasp the handle on the front of the RF power module and carefully pull the RF power module outof the transmitter, noting that there are catches on the transmitter tray that will prevent the rear ofthe RF power module from being fully extracted. When the module reaches these catches, lift therear of the module over the catches by tilting the module’s front down and then lift by the rearhandle. The module weighs 14.5 kg (32 lbs).Installing an RF Power Module1. Grasp the front and rear handles on the RF power module and insert it into the transmitter,ensuring that the rear of the module clears the catches in the transmitter tray.2. Carefully push the RF power module into place so that its edge-card connector mates with thetransmitter.3. Install both M5 securing screws in the RF power module’s front panel.4. Set the ENABLE/DISABLE switch on the front of the RF power module to its ENABLE position (seeFigure 4.1.12 on page 4.1.41). This activates the RF power module and its two associated powersupplies.5. Install the front filter panel by positioning it in its two bottom slots and tightening its eight (8)quarter-turn fasteners (see Figure 4.1.5 on page 4.1.29).WARNING! Fans with rotating blades are present at the bottom of the RFpower module. Take care when removing the module.