TM 11-5895-846-14
(16) If no fault indicators are illuminated after
(10) Remove the LV FUSE. On the power
performing step (14) above , place the power supply
supply rear panel, remove the cable from connector J3.
MONITOR switch to the BEAM V X1000 position and
(11) Remove the top cover of the power supply
observe the MONITOR meter for an indication of
by turning each of the fasteners 1/4-turn counter-
approximately 4600 volts.
clockwise.
(17) Place the OPERATE-STANDBY switch to
(12) Place the TEST-NORMAL switch (inside
the STANDBY position.
drawer on left side) to the TEST position.
(18) Replace fuse HV2.
(13) Replace the HV4 fuse and depress the
(19) Place the OPERATE-STANDBY switch to
top cover interlock switch.
the OPERATE position.
(14) Replace the LV FUSE and place the
(20) If the HV INHIBIT and BODY OVLD
OPERATOR-STANDBY switch to the OPERATE
indicators are again illuminated, the problem is in the
position.
power supply. Remove the power supply (para 5-21)
(15) Place the MONITOR switch to the BEAM
and return it to the next higher level of maintenance.
V X1000 position and observe the MONITOR meter.
(21) If no fault indicators are illuminated after
(16) The voltage as indicated on the
performing step (19) above , observe the MONITOR
MONITOR meter should be approximately 2200 volts. If
meter for a BEAM V X1000 indication of approximately
the voltage is low, the problem is in the high voltage
7000 volts.
(22) If the voltage indication of step (21) above
is correct, the problem is in the PA klystron. Remove
(17) If the voltage is correct, place the
OPERATE-STANDBY switch to the STANDBY position.
(23) Replace fuse HV1. Replace the high
(18) Remove the HV4 fuse, replace the HV3
voltage cable removed from connector J3 in step (9)
fuse and depress the interlock.
above and secure the power supply drawer.
(19) Place the OPERATE-STANDBY switch to
g. HV INHIBIT Status Indicator and HV MAIN
the OPERATE position and observe the MONITOR
Fuse Indicator.
meter.
(20) The voltage as indicated on the
(1) Loosen the eight captive screws on the
MONITOR meter should be approximately 2200 volts. If
front panel of the power supply.
the voltage is low, the problem is in the high voltage
(2) Pull on the two handles to extend the
transformer/rectifier module A15; remove and replace
power supply from the rack.
(3) Place the OPERATE-STANDBY switch to
(21) If the voltage is correct, place the
the STANDBY position and remove fuses HV1, HV2,
OPERATE-STANDBY switch to the STANDBY position.
HV3, and HV4.
(22) Remove the HV3 fuse, replace the HV2
(4) Replace the HV MAIN fuse.
fuse and depress the interlock.
NOTE
(23) Place the OPERATE-STANDBY switch to
A spare fuse is located in the SPARE
the OPERATE position and observe the MONITOR
holder to the left of the HF MAIN fuse.
meter.
(5) Momentarily
place
the
FAULT
(24) The voltage as indicated on the
CKT/RESET switch to the RESET position and then
MONITOR meter should be approximately 2200 volts. If
release it. Place the OPERATE-STANDBY switch to the
the voltage is low, the problem is in the high voltage
OPERATE position.
transformer/rectifier module A16; remove and replace
(6) Observe the LED indicators on the pulse
synthesizer (A4) and high voltage switching (A5 through
(25) If the voltage is correct, place the
OPERATE-STANDBY switch to the STANDBY position.
(7) If any LED indicator is extinguished on the
(26) Remove the HV2 fuse, replace the HV1
pulse synthesizer module A4, the problem is in that
fuse and depress the interlock.
(27) Place the OPERATE-STANDBY switch to
(8) If any LED indicator is extinguished on
the OPERATE position and observe the MONITOR
either of the high voltage switching modules A5 through
meter.
A12, the problem is in that module; remove and replace
(28) The voltage as indicated on the
MONITOR meter should be approximately 2200 volts. If
(9) If all LED indicators on the modules are
the voltage is low, the problem is in the high voltage
illuminated, place the OPERATE-STANDBY switch to the
STANDBY position.
5-14