Nautel NV3.5, Troubleshooting Manual

Page: 48 / 228

NV5/NV3.5 Troubleshooting Manual Responding to alarms
Page 1-40 Issue 3.2 2014-12-10
Remote interface PWB replacement
See Figure
MD-1
in Section 6 of this manual.
1. Open the front door to gain access to the remote interface PWB (A2).
2. Remove all customer interface wiring from the remote interface PWB. Note the destination
of 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 helpful
to 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 remote
interface 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 interface
PWB 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 Replacement
See Figure 1.6 on page 1-41 and Figures
MD-2
and
MD-7
in the Mechanical Drawings section
(Section 6) of this manual.
1. Open the front door and remove the blank panel to the right of the RF power modules.
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 the
appropriate ac plug from the ac distribution assembly (A6). Disconnect P3 from A6J3 for
WARNING:
Lethal voltages exist inside the transmitter when the power is turned
on. Follow replacement instructions carefully to ensure safety for
maintenance personnel during power supply replacement.