
XR12 Troubleshooting Manual
Responding to alarms
Issue 3.0 2009-07-28
Page 1-29
7. Restart impedance checks at
.
PA volts to B+ impedance
Measure impedance between the B+ volts input and the PA volts output for each RF power block:
1. Measure the resistance between terminal
H
(PA volts) of each PA input/output PWB and its
associated B+ fuse.
2. Each resistance measurement in
should be about 230 k
Ω
with the red meter lead on
the
H
terminal, and about 400 k
Ω
with the black meter lead on the
H
terminal. If all
measurements are satisfactory, proceed to
“Functional test procedures” on page 1-29
3. If any resistance measurement in
is greater than 1.0 M
Ω
, assume the modulator
assembly associated with the RF power block is defective (contains defective MOSFETs).
Replace the suspect modulator assembly (see
“Modulator assembly replacement” on page 1-
).
4. Reinstall removed modulator assemblies, using serviceable replacement assemblies.
5. Restart impedance checks at
.
PA output to ground impedance
Using a multimeter set to measure ohms, measure the resistance from the
C
terminal (+ or -) to
ground, and the
G
terminal (+ or -) to ground, on all four PA input/output PWBs. If the module is
cold, the resistance should measure about 1 M
Ω
or more. If the reading is near 0
Ω
, the PA being
measured contains shorted FETs and must be replaced or repaired. Replace the suspect PA assembly
(see
“RF amplifier assembly replacement” on page 1-48
).
Functional test procedures
Perform a functional test to verify the status of suspect or repaired RF power modules as follows:
1. Verify that all assemblies suspected of being defective – based on the status of
the front panel
Alarms
lamps, or by failing an impedance test given in
– have been replaced with a serviceable assembly.
2. Verify that all of the RF power module's electrical assemblies are properly installed, and all
mating connectors are properly connected.
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Страница 100: ...XR12 Troubleshooting Manual Detailed Circuit Descriptions Page 2 32 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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