Model 125W1000A
Rev A
33
4.3.1
General - Reading Faults
The Model 125W1000A 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 (Diagram No 10052988)
During a Thermal Fault, the front panel display should read THERMAL FAULT.
1.
Try to reset the unit; if the unit resets and operates normally, check to see that the cooling fans (B1-B3) is
are operating normally and that the air inlets
on the bottom and side covers 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 A7
Control/Fault Board, J5, Pin 23 or 24 should be
≤
0.01V.
3.
If the voltage on A7 J5, pin 23 or 24 is high, check the connection to A3(P3-1) and S1-1
4.3.4
Interlock Fault (Diagram No. 10052988)
The Model 125W1000A is equipped with an interlock connector, which is located on the rear panel. The
interlock circuit can be used to sense the openings of doors to screen rooms, test chambers, and so forth, and to
turn off RF energy when these doors are opened.
NOTE: The Model 125W1000A is shipped with a mating connector, which has a jumper between Pins 1 and 8,
installed in the rear panel interlock connector. The unit will not operate unless the interlock circuit is
closed.
1.
In the event of an Interlock Fault, the front panel display should read INTERLOCK FAULT
.
2.
Check to see if it is safe to be power up the unit—are there personnel present in the screen room, or are
doors to the screen room open?
3.
After checking for safety, try to clear the Interlock Fault from the front panel by using the RESET switch.
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