from the positive (red) test indi-
cator binding post to the B+ bind-
RIABLE VOLTS" position.
(e) Slowly turn the dc variable power
of the test lead which is connected
to the negative (black) test indica-
until the lower contacts of the line
tor binding post unconnected as
and observe the voltage reading on
t h e dc voltmeter (fig. 54). The
(b) Connect a test lead from the cover
voltage reading should be 13 volts
plus or minus 1 volt.
regulator to the B- binding post
(f) Slowly turn the dc variable power
supply control (fig. 54) counter-
(c) Place the starter test load discon-
clockwise until the lower contacts
nect switch in the "ON'" position,
of the line switch (load relay) (fig.
56) open, and observe the voltage
in the "ON" position, and the bat-
reading on the dc voltmeter (fig.
t e r y on-off switch in the "ON"
54). The voltage reading should be
between 9 and 11 volts.
(d) Touch the free end of the test lead,
(a) above, to each pin and socket
(g) Adjust the line switch, if necessary,
by turning the line switch (load re-
of the two receptacles (fig. 53) of
crease or decrease the closing volt-
tor. Test indicator lamp (fig. 53)
age. Remove the test leads from
should not light when any recep-
the "C" and "F" pins, (b) a b o v e ,
tacle pin or socket is touched. Re-
and continue with test in (4) below.
move the test leads from the test
indicator binding posts and con-
(4) Carbon pile - setting adjustments.
tinue with tests in (3) below.
Note. Setting procedures for the carbon
pile is accomplished by lapping the carbons
(3) Line switch (load relay) - closing and
of the voltage regulator element assembly
(a) Remove the cover assembly (fig.
tion. The voltage regulator element assem-
bly (see TB 9-2300-206-15 for complete
breakdown) is placed in the circuit with the
regulator to have access to the ad-
test stand which allows the carbon disks to
vibrate under controlled conditions by use
of the test stand. The vibration can be heard
(b) Connect two test leads to the dc
through a headset connected as shown in
v a r i a b l e volts binding posts as
(a) Place the cover assembly with the
l e a d from the positive (red) dc
voltage regulator element assembly
variable volts binding post to the
"F" pin in the receptacle as shown
surface on top of the test stand as
t h e negative (black) dc variable
(b) Leave the two test leads connected
volts binding post to the "C" pin in
to the dc variable volts binding
the receptacle as shown in figure
posts, (3) (b) above, and as shown
the positive (red) dc variable volts
(c) Connect a test lead from the cover
binding posts to the "A" contact
of the cover assembly and the lead
r e g u l a t o r to the ground (GND)
from the negative (black) dc vari-
able volts binding post to the "D"