AR 1000W1000G, Руководство по эксплуатации и обслуживанию, Страница: 57 / 70

Model 1000W1000G
Rev A 37
4.3.6 Amplifier Faults (Schematics 10046885 and 10045396)
1. The individual fault outputs for the A2 Driver Module and the A6-A21 Final Modules are sensed on
the A26A3 Switch Breakout Assembly, J5, pins 9 through 25.
2. The amplifier’s top enclosure and amplifier cover can be removed to allow access to A2 Driver
module. The side enclosure and amplifier covers can be removed to allow access to A6-A21 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 10046885)
All indicators on the Model 1000W1000G 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 V1
+5.0 V ± 0.5 V
PS1 V2 +15.0 V
±
0.5 V
PS1 V3 -15.0 V
±
0.5 V
PS2 +24.0 V ± 0.5 V
PS3 +24.0 V ± 0.5 V
PS4 +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