XR12 Troubleshooting Manual
Responding to alarms
Page 1-14
Issue 3.0 2009-07-28
3. If the input voltages are satisfactory, and the output cannot be adjusted to the required level,
suspect the RF drive power supply PWB.
4. If the output voltage is within 62 V ± 10%, and the alarm persists, recalibrate the RF drive
power supply to read the measured voltage (see
“Calibrating meters” on page 2-21
Operating and Maintenance Manual
).
LVPS fault
The 24 V, 15 V, -15 V and 5 V power supplies are monitored and will report a fault if the voltage is
outside the range of ± 10%. One or more of these faults will result in only one
LVPS Fault
message
on the
Status
screen, though each one would be reported by the
Events Log
.
The alarm may be caused by a failure of the power supply, a fault in the detection circuitry on the
exciter interface PWB, or a fault in the alarm circuit on the control/display PWB. Troubleshoot a
LVPS Fault
as follows:
1. On the control/display PWB, measure the following. If any readings are outside ± 10%,
suspect a problem in the low voltage power supply.
•
5 V on TP9
•
15 V on TP12
•
24 V on TP18
•
-15 V on TP20
2. If the voltages in Step 1 are correct, recalibrate each of the voltages to read the measured
voltages (see
“Calibrating meters” on page 2-21
Operating and Maintenance Manual
).
3. Measure the voltage between R46-RHS and ground on the distribution PWB. If it is outside
the range of 15 V ± 10%, replace power supply A22.
VSWR alarm
An output networks VSWR alarm indicates the reflected power is higher than normal. When VSWR
reaches 1.5:1, the transmitter will shutback the RF output power to prevent damage.
Summary of Contents for XR12
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Page 8: ...XR12 Troubleshooting Manual Table of contents Page viii Issue 3 0 2009 07 28...
Page 12: ...XR12 Troubleshooting Manual Page xii Issue 3 0 2009 07 28...
Page 20: ...XR12 Troubleshooting Manual Page xx Issue 3 0 2009 07 28...
Page 100: ...XR12 Troubleshooting Manual Detailed Circuit Descriptions Page 2 32 Issue 3 0 2009 07 28...
Page 108: ...XR12 Troubleshooting Manual Parts Lists Page 3 8 Issue 3 0 2009 07 28...
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Page 214: ...XR12 Troubleshooting Manual Reading Electrical Schematics Page 5 6 Issue 3 0 2009 07 28...
Page 223: ...Issue 3 1 2014 05 07 SD 9 Figure SD 9 NAPX05E 02 Dynamic Carrier Control PWB Sheet 1of 2...
Page 224: ...Issue 3 1 2014 05 07 SD 10 Figure SD 10 NAPX05E 02 Dynamic Carrier Control PWB Sheet 2 of 2...
Page 233: ...Issue 3 1 2014 05 07 SD 19 Figure SD 19 NAP34A RF Power Module Overall Sheet 1 of 2...
Page 234: ...Issue 3 1 2014 05 07 SD 20 Figure SD 20 NAP34A RF Power Module Modulator Stage Sheet 2 of 2...
Page 235: ...Issue 3 1 2014 05 07 SD 21 Figure SD 21 NAPC150A RF Drive Control PWB Sheet 1 of 3...
Page 236: ...Issue 3 1 2014 05 07 SD 22 Figure SD 22 NAPC150A RF Drive Control PWB Sheet 2 of 3...
Page 237: ...Issue 3 1 2014 05 07 SD 23 Figure SD 23 NAPC150A RF Drive Control PWB Sheet 3 of 3...
Page 238: ...Issue 3 1 2014 05 07 SD 24 Figure SD 24 NASM07H Modulator Assembly...
Page 239: ...Issue 3 1 2014 05 07 SD 25 Figure SD 25 NAA51A 03 RF Amplifier Assembly...
Page 245: ...Issue 3 1 2014 05 07 SD 31 Figure SD 31 NAPS10C RF Drive Power Supply PWB...
Page 248: ...Issue 3 0 2009 07 28 MD 1 Figure MD 1 XR12 Transmitter...
Page 257: ...Issue 3 0 2009 07 28 MD 10 Figure MD 10 NAPP02 01A RF Current Probe PWB...
Page 259: ...Issue 3 0 2009 07 28 MD 12 Figure MD 12 NAFP103 05 Forward Reflected Power Probe A1 DETAIL...
Page 263: ...Issue 3 0 2009 07 28 MD 16 Figure MD 16 NAPC150A RF Drive Control PWB...
Page 265: ...Issue 3 0 2009 07 28 MD 18 Figure MD 18 NASM07H Modulator Assembly...
Page 266: ...Issue 3 0 2009 07 28 MD 19 Figure MD 19 PA Input Output PWB 176 1065 04 and 05...
Page 267: ...Issue 3 0 2009 07 28 MD 20 Figure MD 20 NAA51A 03 RF Amplifier Assembly...
Page 268: ...Issue 3 0 2009 07 28 MD 21 Figure MD 21 NAPI47B Modulator Input Output PWB...
Page 271: ...Issue 3 0 2009 07 28 MD 24 Figure MD 24 Relay Assy 202 7019...
Page 272: ...Issue 3 0 2009 07 28 MD 25 Figure MD 25 Fan Tray 202 7020 J1 B1 B2...
Page 273: ...Issue 3 0 2009 07 28 MD 26 Figure MD 26 NAPS10C RF Drive Power Supply 62 V...
Page 275: ...Issue 3 0 2009 07 28 MD 28 Figure MD 28 Rectifier Assembly 202 7017...
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