Nautel NV40 Troubleshooting Manual

Also see for NV30: Operation and maintenance manual

Nautel NV40 Troubleshooting Manual Manual pdf 49 page image

NV40/NV30 Troubleshooting Manual Responding to alarmsIssue 3.2 2014-12-10 Page 1-41Remote interface PWB replacementSee Figure MD-1 in Section 6 of this manual.1. Open the left-hand front door to gain access to the remote interface PWB (A2).2. Remove all customer interface wiring from the remote interface PWB. Note the destinationof each wire for ease of reconnecting.3. Remove and retain six sets of mounting hardware from the remote interface PWB.4. Pull the remote interface PWB away from the control/interface PWB (A1). It may be helpfulto gently pry the connector loose with a screwdriver.5. Set the STATUS and ALARM jumpers as well as jumpers E1 through E24 on the new remoteinterface PWB to the same positions as the defective PWB.6. Use an indelible marker to identify the LED and switch labels on the new remote interfacePWB to match the labels on the defective PWB.7. Install the new remote interface PWB by reversing steps 3 and 4.8. Reconnect all interface wiring to the new remote interface PWB.9. Return the transmitter to service.LVPS ReplacementSee Figure 1.6 on page 1-42 and Figures MD-2 and MD-7 in the Mechanical Drawings section(Section 6) of this manual.1. Remove the lower rear panel. Retain hardware and locate the suspect LVPS module [U3 (A)or U4 (B)].2. Temporarily disconnect ac power from the suspect LVPS module by disconnecting theappropriate ac plug from the ac distribution assembly (A6). Disconnect P3 from A6J3 forWARNING:Lethal voltages exist inside the transmitter when the power is turnedon. Follow replacement instructions carefully to ensure safety formaintenance personnel during power supply replacement.