Replacement Of Major Components - Raytheon Pathfinder 1200 Instruction Manual

5.3 REPLACEMENT OF MAJOR COMPONENTS
5.3.1
Replacement
(l)
Magnetron V 201
a. Remove 4 screws holding the transmitter unit.
b. Remove the cover from chassis.
c. Disconnect magnetron leads from the pulse transformer.
d. Remove 4 screws holding the magnetron.
e. Ease the magnetron away from the mounting plate and withdraw.
f. To reassemble, reverse the above procedure. •
...
CA UTlON: Do not put the magnetron on iron plate.
(2) Diode Limiter A 102
a. Remove 4 screws holding the Receiver Unit.
b. Withdraw the Diode limiter.
c. To reassemble, reverse the above procedure.
d. To reassemble, reverse the above procedure.
(3) Gunn Oscillator A 301
a. Remove 4 screws hodling the the receiver unit.
b. Disconnect leads from the Gunn Oscillator.
c. Remove 4 screws holding the Gunn Osillator.
d. Withdraw the Gunn Oscillator from the Mixer.
e. To reassemble, reverse the above procedure.
(4) Crystal diodes CD301, 302
a. Remove 4 screws holding the receiver unit.
b. Pull diodes out from their mounts.
c. When replacing ensure that the diode polarity is correct.
d. Pay sufficient care on handling diodes, since they are fragible to strong radio
waves, high voltages and mechanical shocks.
(5) Cathode-ray tube V 401 (See Fig. 5·5)
a. Remove the cover from the Display Unit.
b. Remove 4 knobs on the front panel.
c. Remove front panel.
d. Remove the socket from CRT base.
e. Remove the HV cap from CRT.
f. Remove 4 screws holding the CRT.
g. Remove the CRT frontward.
To replace the CRT proceed as follows:
h. Insert the CRT in position and orientate it so that HV cap is at 9 o'clock.
i. Place the CRT front panel on the tube face and tighten screws.
j.
Replace HV cap and socket.
k. Then reverse above procedure c
~
b
~
a.
(6) Drive motor M 101 (See Fig. 5-6)
a. Remove 4 screws holding the drive motor.
b. Remove the drive motor from turning mechanism plate.
c. To replace, reverse the above procedure.
5-14