TM 11-5840-360-14-1-1
3. Remove eight screws and lockwashers located
5. Remove the two screws and lockwashers
located at the base of the IF assembly and support
on floor of the center sub chassis and lift blower
assembly oust.
bracket.
6. Remove nine screws and washers that detach
4. Reassemble using revel-se (if above.
5.17.2.4 Thermostat S7. The thermostat is located on
the assembly PCB cover.
the left hand side of the magnetron shroud.
7. Disconnect the two feed-through wires from the
1. Remove power per paragraph 5.17.2.
microwave assembly at the PCB.
2. Disconnect wires, noting and tagging hook up
8. Remove the two hex nuts holding the feed
location.
through capacitors to the microwave assembly, and lift
3. Remove two screws attaching the thermostat to
the IF assembly out.
the shroud and remove the thermostat.
9. Reassemble using the reverse of above.
4. Reassemble using the traverse of above.
5.17.2.10 Power Supply Assemblies A2 and A3. The
5.17.2.15 Meter M1. The meter is located on front of
following procedure applies to both power supply
the control panel.
assemblies.
1. Remove power per paragraph 5.17.2.
1. Remove power per paragraph 5.17.2.
2. Loosen four captive screws at top of the control
2. Loosen the two captive screws located at upper
panel and lower panel down and out.
bracket, and swing the supply downward.
3. Remove connecting wires, noting and tagging
3. Disconnect harness from spring connector
hook-up location.
located at rear of the assembly.
4. Remove four hex nuts and washers to free the
4. Shift assembly to the right to free the assembly
meter.
from the hinges and lift the power supply out.
5. Reassemble using reverse of above.
5.17.2.11 High Voltage PCB Assembly A4.
5.17.3 Alignment Procedures (V4)
WARNING
The following procedures are applicable to AN/
BEFORE TOUCHING ANY PARTS,
SPS-64(V)4 system installations only.
Paragraphs
DISCHARGE ANY STORED HIGH
VOLTAGE
USING
A
WELL-
for adjustment of all field adjustable maintenance
INSULATED GROUND LEAD.
controls contained in Receiver Transmitter RT-1241.
1. Remove power per paragraph 5.17.2.
When performed in the sequence given, these
2. Disconnect hook-up wires to the PCB assembly,
instructions constitute an overall alignment procedure
noting and tagging connection locations.
for the receiver transmitter.
3. Remove the five nylon screws holding the PCB
NOTE
assembly to the rear wall of the cabinet, and remove the
When the cover of Receiver
PCB assembly.
Transmitter RT 1241 is removed, HV
4. Reassemble using the reverse of above.
interlock switch S6 must be pulled
5.17.2.12 Antenna Contactor K1. - Contactor K1 is
outward to re store transmitter
located on the right-hand exterior recess of the cabinet.
1. Remove power per paragraph 5.17.2.
operating power.
2. Disconnect hook-up wires, noting and tagging
5.17.3.1 Low Voltage Power Supply Adjustments (V4) .
hook-up location, by loosening terminal screws on the
- The following steps establish the proper operating
contactor.
frequency and output voltage levels for the Low Voltage
3. Remove one screw at top and two screws at the
Power Supply (LVPS) A3. All test points and controls
bottom of the contactor and lift out.
called out are located in Receiver Transmitter RT 1241.
4. Reassemble using the reverse of above.
5.17.2.13 Blower B1.
WARNING
1. Remove power per paragraph 5.17.2.
THE LVPS OPERATOES AS A
2. Disconnect harness connector.
FLOATING
SUPPLY;
THE
FOLLOWING
COMMON
IS
NORMALLY AT -150 TO -175 VDC
WITH RESPECT TO CHASSIS.
EXERCISE EXTREME CARE TO
AVOID CONTACT WHEN MAKING
ADJUSTMENTS.
ALWAYS TURN
POWER OFF BEFORE CONNECTING
OR
DISCONNECTING
TEST
EQUIPMENT.
5-93
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