TM 11-6625-622-40
Ohmmeter connection
Normal reading
To
Switch pos
From
Switch or jack
Infinite resistance.
Normal
----------------
Grd
---------
J1 pin 10----
TUNE POWER switch S4 . .
O ohm.
Down
Infinite resistance.
Grd --------- Center ------------------
J1 pin 55 ----
KEY switch S9 (714E-1--
O ohm.
up
714E- 2/3 switch S6 in
O ohm.
Down
714E-1 position).
Infinite resistance.
J1
pin
56----
Normal ----------------
J1pin 5 -----
K E Y INTLK switch S7 ----
O ohm.
BY PASS
Mode selector switch in
W5 pin k----
Grd
---------
CW KEYswitch S8 --------
Cw pos
Infinite resistance.
Center
0 ohm,
up
0 ohm.
Down
Infinite resistance.
Terminal 2 o f O U T - - - - - - - - - - . . - - - -
300 AUDIO LOAD switch Terminal 1 of
900 ohms *40.
IN
--------------------
J11.
J11.
S5.
W5 pin i - - - - - - - - - - - - - - - - - - - - - - - - - - - -
o ohm.
J1 pin 24----
714E-1--714-2/3 switch S6 -
o ohm.
W5 pin V . . . . . ------ ------ ------ -----
J1 pin 25-----
0 ohm.
W5 pin U - - - - - - - - - - - - - - - - - - - - - - - - - - - -
J1 pin 59----
W5 pin q - - - -
o ohm.
714E-2/3 -----------
J1 pin 55-----
Infinite
resistance.
W5 pin J
J1 pin 24----
Infinite
resistance.
J1 pin 25----
W5 pin i
Infinite
resistance.
W5 pin q
J1 pin 54----
W5 pin m - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Infinite
resistance.
J1 pin 55----
Infinite
resistance.
Terminal 1 of
Terminal 2
of
----
--------------------
MIKE jack J12 ------------
J12.
J12.
Terminal 3
of
-----------------------
Infinite
resistance.
6000
BAL AUDIO IN jack Terminal 1 of
J8.
J8.
J8.
h. Test Harness, Radio Set AN/URM-157, Wir-
g.
Test
Harness,
Radio
Set
AN/URM-157A
ing continuity Checks. Prepare for wiring con-
Switches and Jacks. The f o l l o w i n g
resistance
tinuity checks as follows:
measurements are to be made with no power ap-
plied to the test unit.
(1) Remove all power from the test unit.
Ohmmeter connection
Normal reading
Switch or jack
To
From
Switoh pos
T U N E POWER switch S4 -- J1 pin 10 ---- Grd ------ - - - -
Normal
-----------------
Infinite resistance.
0 ohm.
Down
Infinite resistance.
KEY switch S9 (714E-1--
J19p in m-----
Grd -----.---
Center ---------------
.
714E-2/3--714E-6 switch
0 ohm.
up
S6 in 714E-1 position).
0 ohm.
Down
K E Y INTLK switch S7 ----
Infinite resistance.
J1 pin 5 ----
J1 pin 56----
NORMAL ---------------
BY PASS
0 ohm.
CW stitch S8 -------------
S6B-10 ------
Grd
--------
Center -----------------
Infinite resistance.
0 ohm.
up
0 ohm.
Down
A U D I O LOAD switch S5 --
Terminal 1 of
Terminal 2 of
Infinite resistance.
OUT-------------------
J11.
J11,
300 ohms 40.
IN
--------------------
714E-1--714E-2/3-714E-6
J1 pin 24 ----
W5pin j ----
0 ohm.
switch S6.
J1
pin
25
----
W5
pin
i ----
0 ohm.
J1
pin
59
----
------ ------ ------ ------
W5
pin
q ----
0 ohm.
J12
pin
2 ----
J1
pin
55
----
714E-2/8 --------------
0 ohm.
- - - - - ----- ----- ----- ----
W6
pin
q ----
J1
pin
24
----
Infinite
resistance.
----- ---- ----- ----- ----
W5
pin
U ----
J1
pin
25
----
Infinite
resistance.
J12
pin
2 ----
J1
pin
54
----
- - - - - ----- ----- ----- ----
Infinite
resistance.
W5
pin
V ----
J1
pin
55
----
Infinite
resistance.
MIKE jack J12 -------.---
Terminal 2 of
------ ------ ------ ------
Terminal 1 of
Infinite resistance.
J12.
J12.
600
BAL AUDIO IN jack
Terminal 3 of
Terminal 1 of
Infinite resistance.
J8.
J8.
J8.
3-3
