AVTM6514J Rev. A (03/2003)
27
If disassembly of the Impulse Generator is indicated, clear a bench top work area, and
follow the procedure described in the Maintenance Procedure for removal of the
electronics from the carrying case.
F
WARNING
In the following procedures, lethal voltages will be present at
various points. Before touching any component in the Impulse
Generator, remove power from the equipment, set the OUTPUT
KILOVOLTS switch to ZERO START, use a safety grounding stick,
and apply safety ground jumpers.
Input Circuit Test Points
1. Set the OUTPUT KILOVOLTS switch to ZERO START, and set ON/OFF
switch to ON. If red POWER lamp does not light, check bulb and make sure
socket is receiving proper voltage. If not, check contact S2B on the rotary output
switch, and check transformer T1.
2. If the red POWER lamp lights with the OUTPUT KILOVOLTS switch set to
ZERO START, turn to 3 kV. If the lamp goes out, check:
a. Thermal switch SW3 is closed. (Fan failure could cause SW3 to open.)
b. Relay K1 is operating properly.
Charging, Firing, and Output Circuit Test Points
1. Check connections to meter M1, and check the meter movement.
2. Check test points TP1 and TP2 for +28 V dc (unregulated) and +15 V dc
(regulated) to ground, respectively. This checks the power supplies for the timing
and firing circuits.
3. Connect the VOM across C5; use the lowest dc range. Every six seconds a meter
deflection should occur, indicating that the initial part of the firing circuit is
operating properly.
4. Connect the VOM across C8; use a range of at least 100 V dc. Turn the OUTPUT
KILOVOLTS switch to 3 kV. The meter should read about 90 V, then drop back
towards zero every six seconds. Return the OUTPUT KILOVOLTS switch to
ZERO START. This checks the firing circuit for the main SCR switch in the high-
voltage section.
5. Connect the VOM between circuit board terminal #1 and ground; use a range of at
least 1000 V dc. Set the OUTPUT KILOVOLTS selector switch to 3 kV; the VOM
should read approximately 200 V dc. Set the switch to the other output settings; the
meter reading should increase by approximately 200 V dc at every step, up to
approximately 900 V dc at 15 kV. Return the OUTPUT KILOVOLTS switch to
ZERO START. This checks the dc supply to the high-voltage section.
Summary of Contents for 651403
Page 6: ...AVTM6514J Rev A 03 2003 2 Figure 1 Impulse Generator...
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Page 16: ...Figure 2 Schematic Diagram...
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