
XR6/XR3 Troubleshooting Manual
Responding to alarms
Issue 3.0 2009-07-15
Page 1-15
2. If the transmitter successfully switched to the standby exciter, suspect the main exciter's
interphase PDM driver PWB.
3. Use an oscilloscope to measure the voltage at TP6 on the interphase PDM driver PWB. The
indication should have a dc offset of 1.4 V ± 10%. If not suspect the remote interface PWB
or the IBOC/DRM exciter if you are operating in all-digital (HD) mode.
4. Measure the dc voltage at TP1 of the interphase PDM driver PWB. If the voltage is either
0 V (and transmitter not shut back) or 15 V, suspect the control/display PWB.
5. Use an oscilloscope to measure TP2 of the interphase PDM driver PWB. The signal should
be a square wave at the transmitter’s 2f
PDM
frequency (nominal 130 kHz). If not, suspect the
RF synthesizer PWB.
6. Measure the dc voltage at TP3 on the interphase PDM driver PWB. The voltage should be
the B+ voltage multipled by 0.02 ± 10%. If not, suspect the wiring to the B+ distribution
PWB or the exciter interface PWB.
7. If no faults were found in the previous steps, suspect the control/display PWB.
Auto changeover
This event is caused by a fault in the active exciter with the Auto Changeover function enabled. Faults
that cause exciter changeovers are:
Mod Driver Fail A/B
,
RF Driver Fail
and
PDM Drive Fail
.
•
This event triggers the
Changeover
LED to light, and it will remain lit until manually
cleared.
•
No further auto changeovers are possible until the alarm is cleared.
•
The alarm can be cleared remotely by re-selecting the active exciter.
•
The alarm can be cleared locally by use of the Preset screen.
An
Auto Changeover
alarm indicates that the standby exciter is operating and that the transmitter
has switched from main exciter to standby exciter. The
Auto Changeover
alarm may be caused by a
fault in the transmitter that initiated an automatic exciter changeover, or a fault in the control/display
PWB's microprocessor or alarm circuit. Troubleshoot the
Auto Changeover
alarm as follows:
1. Check the
Events Log
to determine the possible cause of the exciter changeover.
2. Troubleshoot any alarms recorded in the
Events Log
to determine the cause of the exciter
changeover.
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Страница 68: ...XR6 XR3 Troubleshooting Manual Responding to alarms Page 1 48 Issue 3 0 2009 07 15...
Страница 212: ...XR6 XR3 Troubleshooting Manual Wiring connector lists Page 4 18 Issue 3 0 2009 07 15...
Страница 218: ...XR6 XR3 Troubleshooting Manual Reading Electrical Schematics Page 5 6 Issue 3 0 2009 07 15...
Страница 228: ...Issue 3 1 2014 05 07 SD 9 Figure SD 9 NAPX05E 02 Dynamic Carrier Control PWB Sheet 1of 2...
Страница 229: ...Issue 3 1 2014 05 07 SD 10 Figure SD 10 NAPX05E 02 Dynamic Carrier Control PWB Sheet 2 of 2...
Страница 238: ...Issue 3 1 2014 05 07 SD 19 Figure SD 19 NAP34A RF Power Module Overall Sheet 1 of 2...
Страница 239: ...Issue 3 1 2014 05 07 SD 20 Figure SD 20 NAP34A RF Power Module Modulator Stage Sheet 2 of 2...
Страница 240: ...Issue 3 1 2014 05 07 SD 21 Figure SD 21 NAPC150A RF Drive Control PWB Sheet 1 of 3...
Страница 241: ...Issue 3 1 2014 05 07 SD 22 Figure SD 22 NAPC150A RF Drive Control PWB Sheet 2 of 3...
Страница 242: ...Issue 3 1 2014 05 07 SD 23 Figure SD 23 NAPC150A RF Drive Control PWB Sheet 3 of 3...
Страница 243: ...Issue 3 1 2014 05 07 SD 24 Figure SD 24 NASM07H Modulator Assembly...
Страница 244: ...Issue 3 1 2014 05 07 SD 25 Figure SD 25 NAA51A 03 RF Amplifier Assembly...
Страница 247: ...Issue 3 1 2014 05 07 SD 28 Figure SD 28 Not Used...
Страница 251: ...Issue 3 1 2014 05 07 SD 31 Figure SD 31 NAPS10B RF Drive Power Supply PWB...
Страница 254: ...Issue 3 0 2009 07 15 MD 1A Figure MD 1A XR6 XR3 Transmitter 3 Phase Ac...
Страница 255: ...Issue 3 0 2009 07 15 MD 1B Figure MD 1B XR6 XR3 Transmitter 1 Phase Ac...
Страница 256: ...Issue 3 0 2009 07 15 MD 2 Figure MD 2 NAC115A Control Panel Rear View A1 Control Display PWB A2 DCC PWB optional...
Страница 258: ...Issue 3 0 2009 07 15 MD 4 Figure MD 4 NAPX05E 02 Dynamic Carrier Control PWB optional NAPX05E 01 shown NAPX05E 02...
Страница 264: ...Issue 3 0 2009 07 15 MD 10 Figure MD 10 NAPP02 02 RF Current Probe PWB...
Страница 266: ...Issue 3 0 2009 07 15 MD 12 Figure MD 12 NAFP103 05 Forward Reflected Power Probe A1 DETAIL...
Страница 270: ...Issue 3 0 2009 07 15 MD 16 Figure MD 16 NAPC150A RF Drive Control PWB...
Страница 272: ...Issue 3 0 2009 07 15 MD 18 Figure MD 18 NASM07H Modulator Assembly...
Страница 273: ...Issue 3 0 2009 07 15 MD 19 Figure MD 19 PA Input Output PWB 176 1065 04 and 05...
Страница 274: ...Issue 3 0 2009 07 15 MD 20 Figure MD 20 NAA51A 03 RF Amplifier Assembly...
Страница 275: ...Issue 3 0 2009 07 15 MD 21 Figure MD 21 NAPI47B Modulator Input Output PWB...
Страница 278: ...Issue 3 0 2009 07 15 MD 24 Figure MD 24 Relay Assy 202 7019 01...
Страница 279: ...Issue 3 0 2009 07 15 MD 25 Figure MD 25 Fan Tray 202 7020 J1 B1 B2...
Страница 280: ...Issue 3 0 2009 07 15 MD 26 Figure MD 26 NAPS10C RF Drive Power Supply 62 V...
Страница 283: ...Issue 3 0 2009 07 15 MD 28A Figure MD 28A Rectifier Assembly 3 Phase Ac 202 7017...
Страница 284: ...Issue 3 0 2009 07 15 MD 28B Figure MD 28B Rectifier Assembly 1 Phase Ac 202 7220...
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