AR 10046249, Operating And Service Manual, Page: 47 / 58

Model 150/150AW1000
Rev C 27
4.3.1 General - Reading Faults
The Model 150/150AW1000 incorporates relatively simple fault detection circuitry, which makes use of the
digital display panel to alert the user or technician which component(s) need service. Use of these indications
can usually expedite troubleshooting of the amplifier. Most faults can be immediately determined down to the
assembly level. If a reset is still indicated, turn off the RF power signal to the input of the amplifier, read and
record the fault indication displayed on the digital control panel for later reference. Then, use the RESET
function to see if the fault clears. If the fault clears, slowly bring the amplifier’s drive level back up and ensure
that recommended RF power levels are not exceeded. If the fault indication is no longer visible, the fault may
have been brought about by a temporary transient condition, component thermal condition or excessive RF
drive to the amplifier’s input. If the fault does not clear with the RF drive off, some other problem exists in the
amplifier.
4.3.2 The Unit Cannot Be Operated Remotely
1. Verify that the front panel LOCAL/REMOTE switch is set to the REMOTE position.
2. Verify that the unit operates locally by resetting the LOCAL/REMOTE switch to the LOCAL position; if
the unit does not operate locally, see 4.3.1 of this manual.
3. Check the position of the ADDRESS via the control software on the front panel touch screen as shown in
Figure 2-3 herein. Check to see that these switches are properly set for either RS-232 or IEEE-488
operation, as desired. (See Section 2 of this manual for the proper ADDRESS settings.)
4.3.3 Thermal Fault-Lo Band (Schematic 10046147, 10039874)
1. During a Thermal Fault, the front panel touch screen interface should read Ax THERMAL FAULT.
2. Try to reset the unit; if the unit resets and operates normally, check to see that the cooling fans (B1 thru B3)
are operating normally and that the air inlet on the bottom of the unit and the air outlets on the rear of the
unit are not blocked.
3. If the unit does not reset and the cooling fans are operating normally, check the voltage at the A12A3
Control/Fault Board, J5, Pins 23 thru 26 should be
≤
0.1V.
4. If the voltage on A12A3 J5, pin 23 thru 26 is high, check the connection through S1 to ground.
4.3.4 Thermal Fault Hi Band (Schematic 10046147, 10045396)
1. During a Thermal Fault, the front panel touch screen interface should read Ax THERMAL FAULT.
2. Try to reset the unit; if the unit resets and operates normally, check to see that the cooling fans B1 thru B3
are operating normally and that the air inlet on the bottom of the unit and the air outlets on the rear of the
unit are not blocked.
3. If the unit does not reset and the cooling fans are operating normally, check the voltage at the A12A3
Control/Fault Board, J11, Pin 3; it should be
≤
0.1V.
4. If the voltage on A12A3 J5, Pin 3 is high, check the connection through S1 to ground.