
XR6/XR3 Troubleshooting Manual
Responding to alarms
Issue 3.0 2009-07-15
Page 1-17
A
Cutback Level (1-8)
status indicates that several shutback alarms (at least three shutbacks in five
seconds) have occurred. A cutback alarm may be triggered by a fault in the transmitter, large VSWR,
or a fault in the control/display PWB's microprocessor or alarm circuitry. Troubleshoot a cutback
alarm as follows:
1. Read the RF output power level on the
RF KILOWATTS
meter on the transmitter's front
panel.
2. Press/release the
Control - Power Increase
switch to clear the cutback alarm and to restore
the preset power level. If the fault persists, the output power will automatically cut back
again. Observe the
Events Log
and note which alarm is causing shutback. Refer to the
appropriate troubleshooting paragraph in this section.
Ext. PDM inhibit
The external PDM inhibit is wired to the remote interface PWB.
An
Ext. PDM Inhibit
alarm indicates that an external PDM inhibit command is present. The alarm
could be caused by an short circuit in the external wiring path to the remote control PWB, a fault in
the switching circuitry on the remote interface PWB, or a fault in the alarm circuitry on the control/
display PWB. Troubleshoot an
Ext. PDM Inhibit
alarm as follows:
1. If E19 is between pins 2 and 3, verify the dc voltage between TB2-6 and ground on the
remote interface PWB is approximately 24 V. This signifies there is no external PDM inhibit
command.
2. If E19 is between pins 1 and 2, verify the dc voltage between TB1-3 and TB2-6 on the
remote interface PWB is 0 V. This signifies there is no external PDM inhibit command.
are met, suspect the remote interface PWB or the
control/display PWB.
Int. serial fail
This alarm indicates that there is no communication with the remote interface PWB. This alarm is
triggered if two seconds go by without acknowledgement from the remote interface PWB of the
control/display PWB's request for information. (The control/display PWB requests updates from
the remote interface PWB every 200 ms).
1. Check the cable between connector P1 (mates with J1 of the control/display PWB) and
connector P15 (mates with J13 of the remote interface PWB). If the cable and connections
are intact, suspect a problem with the control/dispaly PWB or remote interface PWB.
Summary of Contents for XR6
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Page 8: ...XR6 XR3 Troubleshooting Manual Table of contents Page viii Issue 3 0 2009 07 15...
Page 12: ...XR6 XR3 Troubleshooting Manual Page xii Issue 3 0 2009 07 15...
Page 20: ...XR6 XR3 Troubleshooting Manual Page xx Issue 3 0 2009 07 15...
Page 68: ...XR6 XR3 Troubleshooting Manual Responding to alarms Page 1 48 Issue 3 0 2009 07 15...
Page 212: ...XR6 XR3 Troubleshooting Manual Wiring connector lists Page 4 18 Issue 3 0 2009 07 15...
Page 218: ...XR6 XR3 Troubleshooting Manual Reading Electrical Schematics Page 5 6 Issue 3 0 2009 07 15...
Page 228: ...Issue 3 1 2014 05 07 SD 9 Figure SD 9 NAPX05E 02 Dynamic Carrier Control PWB Sheet 1of 2...
Page 229: ...Issue 3 1 2014 05 07 SD 10 Figure SD 10 NAPX05E 02 Dynamic Carrier Control PWB Sheet 2 of 2...
Page 238: ...Issue 3 1 2014 05 07 SD 19 Figure SD 19 NAP34A RF Power Module Overall Sheet 1 of 2...
Page 239: ...Issue 3 1 2014 05 07 SD 20 Figure SD 20 NAP34A RF Power Module Modulator Stage Sheet 2 of 2...
Page 240: ...Issue 3 1 2014 05 07 SD 21 Figure SD 21 NAPC150A RF Drive Control PWB Sheet 1 of 3...
Page 241: ...Issue 3 1 2014 05 07 SD 22 Figure SD 22 NAPC150A RF Drive Control PWB Sheet 2 of 3...
Page 242: ...Issue 3 1 2014 05 07 SD 23 Figure SD 23 NAPC150A RF Drive Control PWB Sheet 3 of 3...
Page 243: ...Issue 3 1 2014 05 07 SD 24 Figure SD 24 NASM07H Modulator Assembly...
Page 244: ...Issue 3 1 2014 05 07 SD 25 Figure SD 25 NAA51A 03 RF Amplifier Assembly...
Page 247: ...Issue 3 1 2014 05 07 SD 28 Figure SD 28 Not Used...
Page 251: ...Issue 3 1 2014 05 07 SD 31 Figure SD 31 NAPS10B RF Drive Power Supply PWB...
Page 254: ...Issue 3 0 2009 07 15 MD 1A Figure MD 1A XR6 XR3 Transmitter 3 Phase Ac...
Page 255: ...Issue 3 0 2009 07 15 MD 1B Figure MD 1B XR6 XR3 Transmitter 1 Phase Ac...
Page 264: ...Issue 3 0 2009 07 15 MD 10 Figure MD 10 NAPP02 02 RF Current Probe PWB...
Page 266: ...Issue 3 0 2009 07 15 MD 12 Figure MD 12 NAFP103 05 Forward Reflected Power Probe A1 DETAIL...
Page 270: ...Issue 3 0 2009 07 15 MD 16 Figure MD 16 NAPC150A RF Drive Control PWB...
Page 272: ...Issue 3 0 2009 07 15 MD 18 Figure MD 18 NASM07H Modulator Assembly...
Page 273: ...Issue 3 0 2009 07 15 MD 19 Figure MD 19 PA Input Output PWB 176 1065 04 and 05...
Page 274: ...Issue 3 0 2009 07 15 MD 20 Figure MD 20 NAA51A 03 RF Amplifier Assembly...
Page 275: ...Issue 3 0 2009 07 15 MD 21 Figure MD 21 NAPI47B Modulator Input Output PWB...
Page 278: ...Issue 3 0 2009 07 15 MD 24 Figure MD 24 Relay Assy 202 7019 01...
Page 279: ...Issue 3 0 2009 07 15 MD 25 Figure MD 25 Fan Tray 202 7020 J1 B1 B2...
Page 280: ...Issue 3 0 2009 07 15 MD 26 Figure MD 26 NAPS10C RF Drive Power Supply 62 V...
Page 283: ...Issue 3 0 2009 07 15 MD 28A Figure MD 28A Rectifier Assembly 3 Phase Ac 202 7017...
Page 284: ...Issue 3 0 2009 07 15 MD 28B Figure MD 28B Rectifier Assembly 1 Phase Ac 202 7220...
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