(Insure that the drive gear (48) and right idler
(j) Place the megahertz drive motor (35)
gear (54) are properly meshed.)
in its position on the left side of the frequency
c o u n t e r (28) and secure with two machine
(h) Replace the right gear cover (49) and
screws (36) and lockwashers (37). (Insure that
secure to the frequency counter (28) with the
the drive gear (39) and the left idler gear (60)
two machine screws (40, lockwashers (41 and 43),
are properly meshed.)
and hexagonal nuts (42).
(k) Replace the left gear cover (34) and
secure it to the frequency counter (28) with the
(i) Slide the drive gear (39) onto the drive
two machine screws (30), lockwashers (31 and
shaft of the megahertz drive motor (35) and sec-
33), and hexagonal nuts (32).
ure with the spiral pin (38).
3 - 1 3 . Test Equipment and Special Tools
(5) Set TEST FUNCTION SELECTOR
Required for Adjustment
switch S11 to TEST SET position.
(6) Set RCVR/XMTR FUNCTION switch S9
to PTT position.
a d j u s t i n g RF Power Meter M1 (located in
( 7 ) Set XMIT-RCVR-PTT switch S6 to
T S 1 9 6 7 / A R C - 5 4 ) and also the associated
(8) Set POWER/VSWR switch S2 to FWD
Table 3-3. Test Equipment Required for Adjustment
( 9 ) Set POWER circuit breaker to ON
(10) Switches not listed may be set to any
b. To gain access to the interior of the test
set, remove 10 screws from around the edge of
d. Connect the RT-348/ARC-54 and Wattme-
the front panel and slide the test set from the
ter AN/URM120 to the test set as shown in
lower case; use the two handles.
314. Adjustment Procedure for Rf Power
e. Set XMIT-RCVR-PTT stitch S6 to XMIT.
f. Adjust potentiometer R1 (fig. 3-3) until the
reading on RF POWER meter M1 is equal to
t h e reading on the AN/URM120 (approx-
imately 10 watts).
b. Apply +27.5 volts dc to POWER jack J32.
c. Set the test set front panel controls as fol-
For final testing procedures at the general sup-
p o r t level to determine acceptability of a
switch S3 to 40 position.
repaired MK733/ARC-54, refer to the self-
check tests that are part of the monthly preven-
switch S4 to 0 position.
tive maintenance checks in TM 11-6625-601-12.
switch S5 to .00 position.
If all the checks are satisfactory, the
(4) S e t T E S T F U N C T I O N S E L E C T O R
M K - 7 3 3 / A R C - 5 4 can be considered to meet
switch S10 to RADIO position.
acceptable final test standards.