Model 500A250D
Rev A
31
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 switch settings.)
4.3.3
Thermal Fault (Schematic Diagrams 10045748, 10039874)
During a Thermal Fault, the front panel touch screen interface should read Ax THERMAL FAULT.
1.
Try to reset the unit; if the unit resets and operates normally, check to see that the cooling fans (B2
through B5) 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 is operating normally, check the voltage at the A18
Control/Fault Board, J5, pins 19, 20, 22, 23, 24, 26 and 27 should be
≤
0.1V.
3.
If the voltage, on A18 J5, pins 20, 22, 23, 24, 26 and 27, is high, check the connection to J3-6 and FL3 on
the suspect module assembly.
4.3.4
Interlock Fault (Schematic Diagram 10044770)
The Model 500A250D 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 500A250D 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 touch screen interface 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 button
on the touch screen interface.
4.
If the Interlock Fault will not clear, check for continuity in the External Interlock Circuit (Pin 1 to Pin 8 in
the connector, which mate with J1 in the rear panel).
5.
Check the voltage on A12 J5, pin 30; it should be < 0.1V.
6.
If the voltage on A12 J5, pin 30 is high, check the interlock line to ground.
Summary of Contents for 500A250D
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