AR 10051217, Operating And Service Manual

Page: 83 / 90

Model 2000S1G2z8
Rev A 59
4.3.6 Amplifier Faults (Schematics 10051819,10051526)
1. The individual fault outputs for the A3, A5, A9-A16 Driver Modules, and the A25-A56 Final Modules are
sensed on the Switch Breakout Assemblies A64A2 through A68.
A64A2 - J5, Pins 9,11,13,15
A65 – J5, Pins 9,10, 12-19
A66 - J5, Pins 9,10, 12-19
A67 - J5, Pins 9,10, 12-19
A68 - J5, Pins 9,10, 12-19
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 A3, A5, A9-A16 Driver Modules
and A25-A56 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.
A3: FL1, FL2 = +24 ± 0.2V
FL4 = -8V ± 0.3 V FL3=logic high (no fault)
4.3.7 ALC Fault
1. Indication – ALC
2. 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) (Diagram
10051819,10051526)
All indicators are normal, the front panel display reads Power 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 J18 Pin 1,2
+5 V
±
0.5 V
PS1 J18 Pin 5 -15 V
±
0.5 V
PS2 V+
PS3 V+ +24V ± 0.5 V
PS4 V+ +24V ± 0.5 V
PS5 V+ +24V
±
0.5 V
PS6 V+ +24V
±
0.5 V