TM 11-5820-801-30
pump power as indicated on the power bridge.
1, 2, and 4 is controlled by 1CB1 Power to 1PS1 and
PARAMP ELAPSED TIME meters 1M3, 3A1M2, 3A1M4
CAUTION
is controlled by 1CB2. When an overload exists the
Do not perform this step if the channel gain
circuit breaker cannot be set to ON.
bandwidth response is satisfactory per test of
b. MAIN POWER 1CRB1 Overload. If 1CB2 and
1S1 are set to OFF and if 1CB1 cannot be set to ON the
(6) If step (5) is accomplished then (after 2A1
failure can be isolated by successively removing cable
is re- mounted in 2A5) a gain-bandwidth alignment must
plugs as follows:
be made per paragraph 3-7( The prime operational
Fault clears on
criterion is for adequate channel gain-bandwidth
removal of plug
From
Fault is in Module
response. The precise power and frequency of 2A1NVI,
W2P1
2A1J1
2A1
the klystron oscillator, is incidental if that criterion is met.
W1P2
2A2J1
2A2
(7) If steps (5) and (6) above do not give
W1P4
2A3J2
2A3
If a fault is located in one of the above modules, remove
they provide satisfactory operation, disconnect the test
remains after the three plugs are removed, the fault is in
equipment, replace 2A1 in 2A5, slide shut the four
Unit 1. Remove W5P2/W5P3 from 1J1 and make
mounting slide clips., and replace the eight cap screws
continuity checks from 1J11 terminals A, C, F, F to
removed in (1) (a) above.
terminal 2 of line filters 1FL1, 1FL2, 1FL3, 1FL4,
b. Beam Voltage Adjustment.
respectively, with 1CB1 both ON and OFF Refer to figure
(1) A direct test of pump frequency and power
is de scribed in a above Another test and adjustment
necessary.
described here is useful under certain conditions Over
c. Paramp Power 1C82 Overloaod If PARAMP
the life of the klystron oscillator 2A1NV1 (pump) (rated at
POWER circuit breaker 1CB2 cannot be set to ON (but
5000 hours) its output power as measured on the PUMP
1CB1 operates normally) the fault is likely in 1PS1.
meter 1M5 may drop toward the minimum tolerance level
Remove 1P1 from 1PS1J1 and if the fault clears, remove
This may be caused by a small change in the beam
and replace 1PS1 (para 3-11e,). If the fault does not
voltage requirements of the klystron oscillator Regular
clear remove W5P1 from 3A1J1. If the fault clears,
weekly preventive maintenance checks of the pump
meter 3A1M2 or 3A1M4 is at fault. Remove and replace
power (as indicated by meter 1M5) will provide
the faulty meter. If the fault does not clear remove
information as to power decrease which, in turn, will
WUP2/- W5P3 from 1J1. Make continuity checks from
indicate the need for remedial action There are two
1CB2 to 1PS1 to isolate the fault. Make the necessary
causes for reduced PUMP meter indications- klystron
repairs.
oscillator 2A1V1 output power had dropped or the pump
d.
REFRIG POUEFR 1S1 Overload. If 1CB1
power measurement circuit has deteriorated The pump
operates normally but trips when 1S1 is set to ON,
power measurement circuit condition is covered in the
remove W5P4/W5P5 from 4A1J2. If the fault clears the
diagnostic flow charts by the 1R7, PUMP POWER ADJ
fault is in Unit 4. Refer to paragraph 2-1a . If the fault
procedure (fig. 3-6, sheet 4). Also refer to paragraph 2-
remains, remove W5P2/W5P3 from 1J1 and continuity
17b. The procedure here is valid only when output
check from 1CB1 terminals 1and 3 to 1S1 terminals 6
power of klystron oscillator 2A1VI has decreased
Proceed as follows.
necessary repairs.
(2) Set PUMP selection switch 1S3 (fig 2-4)
3-11.
Module Removal and Replacement
to KLYSTRON OUTPUT
a.. Waveguide Filter 2A4. Refer to figures 3-14
(3) Record PUMP meter 1M5 indication.
and 3-15.
(4) Compare indication with that recorded
(1) Snap open the waveguide quick
during the previous weekly check.
disconnects at
(5) If the output power has decreased 0 5 to
the 2A4/2A2 and the 2A4/2A3 interfaces
1.0 unit (on meter scale) and the cause is pump power,
insert screwdriver into hole marked 1000 V ADJ on 1PS1
(2) Lift out Waveguide Filter Module 2A4.
(3) To reinstall 2A4, place the module on the
(6) While observing PUMP meter 1M5, slowly
quick disconnects and snap shut the connectors.
turn adjustment to increase meter indication. The turn
h. Pump Source .Module. Refer to figures 3-14 and
direction that increases power can be either clockwise or
3-12
counterclockwise. Adjust for maximum pump power.
(1) Remove four cap screws from the pump
(7) Set PUMP selection switch 1S3 to OFF
wave- guide interface flange that interfaces 2A1 and 2A2
and per form a gain-bandwidth test and alignment
(2) Remove four cap screws from the pump
according to the procedures of paragraph 3-7b and c.
wave- guide interface flange that interfaces 2A1 and
a. General
3-10.
Main Power Failure
2A3.
Description. Protection against primary power (120 Vac)
overload (shorts) is obtained by means of MAIN
POWER circuit breaker 1CB2 (fig 2-4) All power to Units
3-32
