TM 11-6625-586-45
CHAPTER 3
REPAIRS AND ALIGNMENT
Section I. REPAIRS
transistorized. If the iron must be used with ac,
3-1. General Parts Replacement Techniques
use an isolating transformer between the iron
NOTE
and the line. Do not use a soldering gun; damag-
ing voltages can be induced in components.
Many of the parts used in the signal generator
have precision tolerances greater than those used
in most radio equipment. If these parts require
quickly; wherever wiring permits, use a heat
replacement, use the exact value of the part re-
sink (such as long-nose pliers) between the sol-
moved. If even slightly different values are used,
dered joint and the transistor. Use approximate-
the calibration of the signal generator output
ly the same length and dress of transistor leads
will be inaccurate.
as used originally.
a. Most of the parts of the signal generator
can be reached and replaced easily without spe-
3-2. Disassembly and Reassembly of Gear
cial procedures. The sockets, capacitors, filter
Train
chokes, and inductors are mounted securely to
The gear train is located between the front panel
the chassis with hexagonal nuts or binding head
of the RF tuning section and the RF assembly.
screws. The power transformers are bolted to the
a. Disassembly. To disassemble the gear train,
chassis. The nuts can easily be removed with a
proceed as follows (fig. 6-9):
socket wrench. The dial knobs are removed with
(1) Remove all front panel controls and as-
Allen wrenches. The thermistor covers are re-
sociated hardware (items 1 through 35, less 16,
moved by loosening the two screws on the cover
17 and 18). When unsoldering connections, care-
plate. If any of the switch wafers or potentiom-
fully tag each lead for future identification.
eters require replacement, carefully tag the wires
(2) Remove front panel (36) by removing
or sketch the connections to avoid disconnection
the seven screws (16), lock washers (17) and
when the new component is installed. Follow this
flat washers (18) holding it in place.
practice whenever replacement requires the dis-
(3) Follow the sequence given in figure 6-9
connection of numerous wires.
to disassemble the remaining items.
b. Reassembly. Follow the sequence given in
watt maximum capacity. The signal generator is
Section Il. ALIGNMENT
generator, The chart also lists the associated
3-3. Test Equipment and Special Tools
Required for Alignment
t e c h n i c a l manuals and the assigned common
The following chart lists test equipment and
name.
special tools required for alignment of the signal
Test
equipment
Technical
manual
Common
name
TM 116625700-10
Counter, Electronic Digital Readout,
Electronic counter
AN/USM207
Multimeter ME-26A/U
TM 11-6625-200-15
3-1
