Model 2500A225C
Rev A
49
4.4.1
General - Reading Faults
The Model 2500A225C 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.
The digital control panel of the 2500A225C indicates the output power from the 2500A225C and the power
reflected back to it. If the reflected power is very high, with respect to the forward power, this could indicate
that the output coax cable is defective or that the load being driven has a high VSWR.
4.4.2
The Unit Cannot Be Operated Remotely
1.
Verify that the front panel key-switch is set to the REMOTE position.
2.
Verify that the unit operates locally by setting the key-switch to the LOCAL position; if the unit does not
operate locally, see 4.4.1 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. (See Section 2 of this manual for the proper ADDRESS settings.)
4.4.3
Thermal Fault (Schematic 10052651 for LV, 10053509 for HV)
During a Thermal Fault, the front panel display should read THERMAL AX.
1.
Try to reset the unit; if the unit resets and operates normally, check to see that the cooling fans 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.
2.
If the unit does not reset and the cooling fans are operating normally, check the voltage at the A14A3 Switch
Breakout Assembly, J5, Pins 24-32.
It should be ≤0.1V
.
3.
If the voltage on A14A3 J5, Pins 24-32 is high, check the connection to J3-1 and C6 on the suspect module
assembly.
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