
XR12 Troubleshooting Manual
Responding to alarms
Issue 3.0 2009-07-28
Page 1-19
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.
Mod. protection
This fail is reported from the remote interface PWB.
The exciter monitors a sample of the RF output and conditions the modulator outputs if the RF drive
current becomes great enough to damage the modulators. A
Mod Protection
alarm may occur from
overdriving the transmitter (high output power, high modulation depth, or very low modulating
frequency), a fault in the control/display PWB's alarm circuitry, or a fault in the remote interface
PWB's circuitry. Troubleshoot a
Mod Protection
alarm as follows:
1. Examine the operating conditions under which the alarm occurred. A
Mod Protection
alarm may be initiated if the transmitter is running at rated power with high modulation at a
low modulating frequency. If these conditions were present at the time of the alarm, adjust
the modulating audio low frequency roll off to 30 Hz.
2. Use an oscilloscope to view TP6 on the interphase PDM driver PWB. If the transmitter is
operating at rated power and the audio is clipped (see
of the
XR12
Operating and Maintenance Manual
.
Содержание XR12
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Страница 100: ...XR12 Troubleshooting Manual Detailed Circuit Descriptions Page 2 32 Issue 3 0 2009 07 28...
Страница 108: ...XR12 Troubleshooting Manual Parts Lists Page 3 8 Issue 3 0 2009 07 28...
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Страница 214: ...XR12 Troubleshooting Manual Reading Electrical Schematics Page 5 6 Issue 3 0 2009 07 28...
Страница 223: ...Issue 3 1 2014 05 07 SD 9 Figure SD 9 NAPX05E 02 Dynamic Carrier Control PWB Sheet 1of 2...
Страница 224: ...Issue 3 1 2014 05 07 SD 10 Figure SD 10 NAPX05E 02 Dynamic Carrier Control PWB Sheet 2 of 2...
Страница 233: ...Issue 3 1 2014 05 07 SD 19 Figure SD 19 NAP34A RF Power Module Overall Sheet 1 of 2...
Страница 234: ...Issue 3 1 2014 05 07 SD 20 Figure SD 20 NAP34A RF Power Module Modulator Stage Sheet 2 of 2...
Страница 235: ...Issue 3 1 2014 05 07 SD 21 Figure SD 21 NAPC150A RF Drive Control PWB Sheet 1 of 3...
Страница 236: ...Issue 3 1 2014 05 07 SD 22 Figure SD 22 NAPC150A RF Drive Control PWB Sheet 2 of 3...
Страница 237: ...Issue 3 1 2014 05 07 SD 23 Figure SD 23 NAPC150A RF Drive Control PWB Sheet 3 of 3...
Страница 238: ...Issue 3 1 2014 05 07 SD 24 Figure SD 24 NASM07H Modulator Assembly...
Страница 239: ...Issue 3 1 2014 05 07 SD 25 Figure SD 25 NAA51A 03 RF Amplifier Assembly...
Страница 245: ...Issue 3 1 2014 05 07 SD 31 Figure SD 31 NAPS10C RF Drive Power Supply PWB...
Страница 248: ...Issue 3 0 2009 07 28 MD 1 Figure MD 1 XR12 Transmitter...
Страница 249: ...Issue 3 0 2009 07 28 MD 2 Figure MD 2 NAC113B Control Panel Rear View A1 Control Display PWB A2 DCC PWB optional...
Страница 251: ...Issue 3 0 2009 07 28 MD 4 Figure MD 4 NAPX05E 02 Dynamic Carrier Control PWB optional NAPX05E 01 shown NAPX05E 02...
Страница 257: ...Issue 3 0 2009 07 28 MD 10 Figure MD 10 NAPP02 01A RF Current Probe PWB...
Страница 259: ...Issue 3 0 2009 07 28 MD 12 Figure MD 12 NAFP103 05 Forward Reflected Power Probe A1 DETAIL...
Страница 263: ...Issue 3 0 2009 07 28 MD 16 Figure MD 16 NAPC150A RF Drive Control PWB...
Страница 265: ...Issue 3 0 2009 07 28 MD 18 Figure MD 18 NASM07H Modulator Assembly...
Страница 266: ...Issue 3 0 2009 07 28 MD 19 Figure MD 19 PA Input Output PWB 176 1065 04 and 05...
Страница 267: ...Issue 3 0 2009 07 28 MD 20 Figure MD 20 NAA51A 03 RF Amplifier Assembly...
Страница 268: ...Issue 3 0 2009 07 28 MD 21 Figure MD 21 NAPI47B Modulator Input Output PWB...
Страница 271: ...Issue 3 0 2009 07 28 MD 24 Figure MD 24 Relay Assy 202 7019...
Страница 272: ...Issue 3 0 2009 07 28 MD 25 Figure MD 25 Fan Tray 202 7020 J1 B1 B2...
Страница 273: ...Issue 3 0 2009 07 28 MD 26 Figure MD 26 NAPS10C RF Drive Power Supply 62 V...
Страница 275: ...Issue 3 0 2009 07 28 MD 28 Figure MD 28 Rectifier Assembly 202 7017...
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