TM 11-6625-847-45
CHAPTER 3
REPAIRS AND ALIGNMENT
Section I. GENERAL
Test equipment
Technical manual
3-1. General Parts Replacement Techniques
Generator, Signal AN/
TM 11-6625-683-15
URM-127.
Most of the parts in the SM-442A/GRC can be removed
Oscilloscope AN/USM-
TM 11-6625-535-15 and
and replaced using conventional techniques. Those
140(*).
TM 11-6625-535-15-1
parts requiring special techniques or procedures are
Generator, Signal AN/
TM 11-6625-573-15
described in paragraphs 3-7 through 3-54. The following
GRM-50.
precautions must be observed when working on the SM-
Electronic Counter, Digi-
TM 11-6625-700-10
442A/GRC.
tal Readout AN/USM-
a. Use a pencil-type soldering iron with a 25watt
207.
maximum
capacity.
The
SM-442A/GRC
is
Charger, Battery PP-
TM 11-6130-236-12
transistorized. If the soldering iron must be used with
1451/G.
ac, use an isolation transformer between the soldering
Preamplifier, HP5261A
None
iron and the ac line. Do not use a soldering gun;
Tee Connector UG-
None
soldering guns use high wattage' which can prove
s
274B/U.
harmful to components.
Test Cables W15, W1,
None
W2, W3, W22 and
Use a heat sink (such as a pair of long-nosed pliers)
W25.
whenever possible. Use approximately the same length
Power Supply PP-3940G-TM 11-6130-247-15
and dress of transistor leads as used originally.
Attenuator, HP355D
None
Multimeter ME-26 (*)/U
.TM 11-6625-200-12
3-2. Special Tools and Test Equipment
3-4. Characteristics of Test Equipment Required for
The chart in paragraph 3-3 lists the special test
Alignment
equipment required to align the SM442A/GRC
components.
The type of test equipment required to align the
simulator is described in the chart in paragraph 35.
3-3. Special Test Equipment Chart
3-5. Test Equipment Characteristics
Test equipment
Technical manual
Multimeter AN/PSM-6B
TM 11-6625-475-10
Test equipment
Characteristics
Voltmeter, Electronic
TM 11-6625-524-14
Multimeter AN/PSM-6B
Frequency range: 0 to
AN/URM-145.
30kc.
Voltage range: 0 to
Analyzer, Spectrum TS-
TM 11-5097 or
1,000 ac and to 5,000 dc.
723 (*)/U.
TM 11-6625-255-15
Current range: 0 to 10
amp.
Frequency Selective
Resistance range: 0 to
Voltmeter (to be
10 megohms.
selected).
Sensitivity: 1,000 ohms/
volt ac 20,000 ohms/
volt dc.
Accuracy: 4%
3-1
Previous Page
