XR12 Troubleshooting Manual
Responding to alarms
Issue 3.0 2009-07-28
Page 1-27
Preparation for testing
“Removing an RF power module” on page 1-21
to remove the
power module from the transmitter.
2. Place the RF power module on a suitable work surface in close proximity to the transmitter's
RF power module test circuit, so that the RF power module test cable can reach the power
module.
3. Remove all seven screws from the RF power module's left and right covers. Remove covers.
Resistance measurements
Prior to connecting an RF power module to the test circuit, complete the following resistance
measurements for each RF power block.
and Figures MD-14 and MD-15 in the Mechanical Drawings section to identify the
assemblies associated with a specific RF power block.
1. Remove fuse A14F1 from its holder and measure its resistance using the digital multimeter.
A blown fuse will measure an open circuit.
2. Repeat
for the remaining B+ fuses (A14F4, A14F6 and A14F8), PDM fuses (A14F3,
A14F5, A14F7 and A14F9) and the +15 V dc fuse (A14F2), noting which fuses are good and
which are blown. Blown fuses indicate a fault in the associated power block.
3. Also check the RF drive B+ fuse (F1) on the RF drive control PWB (A1). A blown A1F1
fuse indicates a fault in the RF drive section of the RF drive control (PWB).
Table 1.3: Assemblies Associated with Each RF Power Block
RF
Power
Block
B+
Fuse
PDM
Fuse
Modulator
Assembly
Modulator
Filter
PA
Input/Output
PWB
RF Amplifier
A
A14F1
A14F3
A5
A6
A8
A10/A11
B
A14F4
A14F5
A4
A7
A9
A12/A13
C
A14F6
A14F7
A16
A17
A19
A21/A22
D
A14F8
A14F9
A15
A18
A20
A23/A24
Summary of Contents for XR12
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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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