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Page Title:
Section V. DIRECT SUPPORT TESTING PROCEDURES |
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|  TM 11-5820-6925-35
to DIR OUR, the CURRENT switch to 100 MICRO-AMP,
s.
Meter indication on meter panel assembly
and
turn
the
DECREASE/INCREASE
control
2A15A2 should be 150. If it is not, remove the green
counterclockwise, until mechanical stop is reached.
cap from the IF GAIN control on 70 MHz intermediate
c.
Set ON/OFF (TRANSIT) switch 8S1 on ID-
frequency amplifier 2A5 and, using the tuning tool,
1708/GRC to OFF (TRANSIT) (fig. 3-25).
adjust the IF GAIN control for a meter indication of 150.
d.
Using a screwdriver, adjust the screw on the
t.
Turn meter selector switch 2A15A2S1 to
front of meter 3M1 for a zero meter indication.
OFF (TRANSIT).
e.
Set ON/OFF (TRANSIT) switch 3S1 on ID-
u.
Set the OUTPUT ATTEN control on AN/
1708/GRC to ON.
URM-52B for a dial scale indication of 7 dbm.
f.
Connect a test lead between the DIR CUR
v.
Set AGC SEL switch on 70
MHz
TERMINAL ON TS-56/U and pin A of ID-1708/GRC
intermediate frequency amplifier 2A5 to DIV OFF.
input connector 3W2P1.
w.
Remove the green cap from the ALM SET
g.
Connect a test lead between the COMMON
control on 70 MHz intermediate frequency amplifier 2A5
terminal on TS-656/U and pin B of ID-1708/GRC input
and, using the tuning tool, slowly adjust the control until
connector.
the CARR (IF) alarm indicator on meter panel assembly
2A15A2 lights red. After the CARR (,IF) alarm indicator
h.
On TS-656/U, hold the TEST switch in
lights red, adjust the AIM SET control in the opposite
TEST (up) position and turn the DECREASE/
direction until the CARR (IF) alarm indicator lights
INCREASE control in INCREASE direction (clockwise)
green.
until meter 3M1 on ID-1708/GRC indicates 100.
x.
Replace the green caps removed in steps 8
i.
With the TEST switch on TS-656/U in the
and w.
up position, the TS-656/U meter indication shall be 50
10 microamperes. If it is not, replace meter 3M1 (para
y.
Set meter selector switch 2A15A2SW1 to
CARRIER (IF) and set the AGC SEL switch on 70 MHz
intermediate frequency amplifier 2A5 to TEST.
j.
Turn the TS-656/U off and disconnect the
test leads.
z.
Calibrate the radio test set by performing
steps s through ai of paragraph 3-1.
k.
Set ON/OFF (TRANSIT) switch 8S1 on ID-
1708/GRC to OFF (TRANSIT).
3-67. Calibration of ID-1 708/GRC Meter 3M1
a.
Turn on Test Set, Electrical Meter TS656/U
and allow a 5-minute warmup period.
b.
On the TS-656/U, set the FUNCTION switch
Section V. DIRECT SUPPORT TESTING PROCEDURES
required in the Control settings column; then perform
3-68. General
each specific test procedure and verify it against its
performance standard. Upon completion of the test
a.
The testing procedures contained in this
procedure, turn off and disconnect the test equipment,
section are used to determine whether repaired
and return the equipment to its original operating
equipment is performing satisfactorily for return to users.
condition.
b.
The testing procedures contained in this
3-69. Test Equipment, Tools and Materials
section assume that the equipment being tested is
turned on and operating at the start of the procedure.
All test equipment and tools required to perform the
When performing the tests, comply with the instructions
testing procedures provided in this section are listed in
preceding each chart before proceeding to the chart.
the following charts.
Perform each test in sequence. Do not vary the
sequewe. For each step, perform all the actions
3-83
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