
XR6/XR3 Troubleshooting Manual
Responding to alarms
Page 1-16
Issue 3.0 2009-07-15
RF driver fail
This fault indicates a problem with the RF drive on the current exciter. If the exciter transfer function
is set to
auto
then the microcontroller will attempt an exciter changeover to the standby exciter. If it
cannot complete an exciter changeover, or if the exciter transfer function is set to
manual
, then this
fault will cause a shutback.
An
RF Driver Fail
alarm indicates an incorrect voltage waveform in the RF drive buffer PWB. The
alarm could result from a failure in the RF drive buffer PWB, RF synthesizer PWB, or in the control/
display PWB's alarm circuitry. Troubleshoot an
RF Driver Fail
alarm as follows:
1. The
RF Driver Fail
alarm initiates an automatic exciter changeover to the standby exciter. To
troubleshoot a defective exciter circuit, set changeover to manual as detailed in
Operating and Maintenance Manual
.
2. Use an oscilloscope to measure TP7 of the RF synthesizer PWB. The signal should be a 15
volt peak-to-peak square wave at the carrier frequency. If the signal is present, suspect the RF
drive buffer PWB. Otherwise suspect the RF synthesizer PWB.
3. Use an oscilloscope to measure TP2 of the RF drive buffer PWB. The signal should be a 15
volt peak-to-peak square wave at the carrier frequency. If the signal is present, suspect the RF
drive buffer PWB.
4. Measure the dc voltage at TP1 of the RF drive buffer PWB. If the voltage is less than 0.6 V,
suspect the control/display PWB or transistor Q1 on the RF drive buffer PWB.
Cutback level (1-8)
Should there be three shutbacks within five seconds, the transmitter will enter a power reduction
mode called a cutback.
There are eight levels of cutbacks, the last being a reduction to no forward power whatsoever. At any
given cutback level, there is a predefined time limit that must expire before the cutback level is
reduced to the previous level. If there are no further cutbacks, this process continues until Level 0
(normal) is reached.
The cutback recovery process can be overridden by adjusting the power (up or down), or by pressing
Reset
on the
Status
screen.
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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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