AR 10046836, Руководство по эксплуатации и обслуживанию

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Model 500W1000C
Rev A 35
4.3.6 Amplifier Faults (Schematic Diagram Nos. 10045618 and
10045396)
1. The individual fault outputs for the A2 Driver Module and the A6-A13 Final Modules are sensed on the
A18A3 Switch Breakout Assembly, J5, pins 9 through 17.
2. The amplifier’s top cover can be removed to allow access to A2 Driver module. The side covers can be
removed to allow access to A6-A13 Final Modules.
3. The Amplifier Fault LED (DS1) should be lit, indicating which module has failed.
4. Verify the correct voltages to the modules. Troubleshoot any incorrect voltages.
C50 = +24.0 ± 0.2V
C51 = –15.0 ± 0.2V
4.3.7 ALC Fault
Indication – ALC
As stated previously, the power limit controls could not limit either the forward or reverse power to the preset
threshold. This can be a transient type of problem, if the fault can be cleared. If the fault cannot be cleared with
no RF input drive power, then there is a malfunction in the ALC board or associated circuit.
4.3.8 Low or No Power Output (DC Tests) (Schematic Diagram No.
10045618)
All indicators on the Model 500W1000C are normal, the front panel display reads RF On , and the cooling fans
are operating.
1. Check the position of the RF Gain control—is it set to maximum gain?
2. Check the RF input to the unit—is it the correct amplitude and frequency?
3. Check the RF output connection from the unit—is it correctly connected to the load?
Is the coaxial cable okay?
4. Check the following voltages on the Power Supply. If any of the voltages are out of tolerance, correct them
before further troubleshooting.
PS1 Module Channel 1
+24.0 V
±
0.5 V
PS1 Module Channel 2 +5.0 V
±
0.5 V
PS1 Module Channel 3 +15.0 V ± 0.5 V
PS1 Module Channel 4 -15.0 V ± 0.5 V
PS2 +24.0 V
±
0.5 V
PS3 +24.0 V
±
0.5 V
5. Check the voltage on the feed thru caps of the A2 Driver Amp. Troubleshoot any incorrect voltage.
C50
+24.0 V ± 0.5 V
C51 –15.0 V ± 0.5 V