TM 11-6625-539-14-4
panel assembly is removed from the case, clean
and inspect it as follows:
(1) Remove any dust from the electronic com-
ponents with vacuum cleaning equipment.
(2) Inspect the electronic components and wir-
ing of the test set for broken leads, corroded
terminals, and faulty solder connections. Replace
damaged leads and resolder broken connections.
(3) Check all panel-mounted components for
loose mounting. Tighten mounting hardware as
EL6625-539-14-4-TM-14
required.
Beta Adjustments Setup
(4) If any components are obviously damaged,
replace them.
(4) Insert the test leads of the multimeter into
remote test jacks B, G and E, S.
c. Installation.
(5) Adjust variable resistor R34(10) to obtain
(1) Position the front panel assembly (1, fig. 7-
I
a zero or 0.0 reading on the multimeter.
(6) Repeat steps (2) through (5) above and
(2) Connect the terminals (12 and 13) of the
readjust if necessary.
battery lead (4) to the connectors at the back of
the case. The black negative lead connects to the
(7) Remove the transistor and disconnect the
upper right terminal, the white positive lead con-
multimeter from the transistor test set.
nects to the lower left terminal when you are
e. Transconductance Adjustment
facing the inside of the case.
(1) Adjust the METER ZERO control to zero
(3) Push the front panel assembly into the
the meter.
case until the panel is fully seated. Tighten the six
(2) Connect a 460-ohm 1 percent resistor
captive screws to secure the panel to the case.
across the C, D, and B, G remote test jacks.
(4) Install the cover on the test set.
(3) Adjust the RANGE switch to the
X 1.0 position.
7-10. Maintenance of Test Set Case
(4) Adjust the FUNCTION switch to
FET position.
set case only to the extent necessary to replace
(5) Adjust variable resistor R12 (11) to provide
defective parts. Proceed as follows:
midscale deflection of the meter (20 on top
(1) Remove the two screws (1) that secure
scale). This will adjust the transcon-
each of the catches (2) to the cover (5); remove the
ductance of the unit.
catches.
(2) Pull out the accessory bracket assembly
stallation
(3). Unsrew the spacers (4) from the cover.
a. Removal. All operating components and parts
(3) Loosen the six captive screws (7) and
of the test set, with the exception of the batteries,
remove the battery compartment cover (11) from
are mounted on the front panel assembly. For
the test set case (37). If the captive screws are
service or calibration, you must remet'e the front
damaged, remove the preformed packings (8) and
panel assembly as follows:
unscrew the screws from the cover. Remove the
(1) Remove the cover from the test set.
flat washers (9) and lock washers (10).
(2) Loosen the six captive screws (2, fig. 7-1)
(4) Remove the six batteries (12) from the
that secure the front panel assembly to the case.
battery compartment in the rear of the case. If
(3) Pull outward on the front panel assembly
the battery contacts (19 and 20) are corroded or
to disengage it from the case. Remove only far
bent, remove them by removing screws (13), lock
enough to allow access to disconnect the terminals
washers (14), nuts (15), clips (16), and flat washers
(12 and 13) of the battery lead (4) from the connec-
(17 and 18). Remove battery interconnecting leads
tors at the back of the case. Disconnect the bat-
(21) and the cushioning pads (22).
tery lead terminals and remove the front panel
(5) If the catch strikes (24) are damaged,
assembly fully from the case.
remove the two screws (23) that secure each of the
strikes to the case.
b. Cleaning and Inspection. After the front
