TM 11-5805-356-34-1
d Connect the TH-22/TG to the power source and
c. Connect the AN/USM-486 between send card
operate the ON-OFF switch to ON.
1A1 test point TP3 and ground to measure a positive
e. With no connections made to either of the
dc voltage at the test point.
SEND jack (corresponding to a mark input), note the
d. Connect the TH-22/TG to the power source and
indication of AN/USM-486.
operate the ON-OFF switch to ON.
f. Insert an open telephone plug into either of the
e. With no connections made to either of the
SEND jacks (corresponding to a space input) and
SEND jacks (corresponding to a mark input), note
note the indication of AN/USM-486.
the indication of AN/USM-486.
g. Adjust BIAS ADJ resistor 1R14 and repeat e
f. Insert an open telephone plug into either of the
and f above until the indication obtained in e is twice
SEND jacks (corresponding to a space input) and
that obtained in f.
note the indication of the AN/USM-486.
g. Adjust resistor 1A1R9 and repeat e and f above
3-10. Receive Circuit Loop Current
until the indication obtained in e is twice that ob-
Adjustment
tained in f.
Remove the TH-22/TG chassis from its case and
proceed as follows:
u. Operate switches as follows:
Remove the TH-22/TG chassis from its case, posi-
Switch
Position
tion pc boards in the test position and proceed as
ON-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..OFF
follows:
4W-2W-TEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..TEL
a. Provide a 600-ohm termination at the
115V AC-230V AC-26V DC
Position that corre.mends to in-
2W-4WR line terminals.
put power source being used.
b. Operate switches as follows:
b. Connect the AN/PSM-45 (set to measure 50
Position
Switch
ma) between terminal 2(+ ) and terminal 3() of EXT.
ON-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..OFF
BAT jack J4 (fig. 3-6), and insert an open telephone
MODE ONE-MODE-TWO . . . . . . ..MODE ONE
plug in the EXT. BAT jack.
4W-2W-TEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2W
c. Connect a teletypewriter to REC jack.
NORM-REC-SEND . . . . . . . . . . . . . . . . . ..SEND
d. Connect the TH-22/TG to the power source and
115V AC-230V AC-26V DC
Position that corresponds to in-
put power source being used.
operate the ON-OFF switch to ON.
C. Connect the ME-26B/U between receive card
e. Adjust INT. BAT LOOP CUR control 1R12 to
1A3 test point TP2 and ground to measure a positive
obtain an indication of 21 ma 2.
dc voltage at the test point.
Change 1
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