Model 250S1G6
32
Rev D
4.3.4
Interlock Fault (Schematic Diagram No. 10034514)
The Model 250S1G6 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 250S1G6 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.
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 P32 in the rear panel).
5.
Check the voltage on A1 J13, pin 30; it should be < 0.1V.
6.
If the voltage on A1 J13, pin 30 is high, check the interlock line to ground.
4.3.5
Power Supply Faults (Schematic Diagram No. 10034514)
4.3.5.1
PS1 Fault (DC OK)
The PS1 power supply has a DC OK output which is normally high (≤4.0V) to the A1J13, pin 29. If any of
the PS1 outputs fail, this output will go low (≤0.1V) and inhibit the A2 Driver Module.
4.3.5.2
PS2 and PS3 Fault (POWER FAIL)
The PS2 power supply has POWER FAIL output which is normally low (
≤
0.1V) to the A1 J13, pin 24. The
PS3 power supply has POWER FAIL output which is normally low (≤0.1V) to the A1 J13, pin 25.
If these
outputs fail, this output will go high (> 4.0V) and inhibit the A2 Driver Amplifier.
4.3.6
Amplifier Faults (Schematic Diagram Nos. 10034514)
1.
The fault outputs for the 21 Quadrature-Coupled Amplifiers (Quad Amps) (A2, A4-A7, A12-A27) are
sensed on the A34 Control/Fault Board, J13, pins 10 through 14.
2.
The amplifier’s top cover can be removed to allow access to Quad Amp A2. The side covers can be
removed to allow access to A9-A7, A12-A27 modules.
3.
The Amplifier Fault pin voltage should be logic low, indicating which Quad Amp(s) has failed.
4.
Verify the correct voltages to the Quad Amps. Troubleshoot any incorrect voltages.
C2 = +24.5 ± 0.5V
C1 = +5 ± 0.3V
C3=logic high (no fault)
