Brushes and commutator
RESTRICTED
Average
Resistance
Chart, M-3
Sight.
M-6 Sight
the sight there is danger or burning out the leads,
and
will cause
precession.
The pig
tails
are shaped so that they
enter
plug
at 180°
angle.
permits the
brush to adjust
itself to the commutator and pre-
vents the pig tail from binding on the brush plug.
The pig taii is
curved from
the brush
plug
to the
terminal in such a manner that it will not touch
anything as the gyro precesses.
Check
continuity of
all units through
switch
panel.
2 ,
Mount stabilizer and sight on the stand.
b.
Plug
in the bombsight.
C.
Contact plus and minus terminals in
stabilizer cannon
plug,
poles 2 and
I respectively. With
the prods of the
ohmmeter
set
on poles l and 2,
turn
on one switch at a time and note the
resistance in ohms for each circuit.
DO NOT HAVE CURRENT OF THE EQUIPMENT
WHILE USING THE OHMMETER TO CHECK RE-
d.
SISTANCE.
Compare the reading obtained with the
chart given.
Not enough
resistance
short circuite
too much
resistance indicates
faulty connect-
tions, dirty terminals, loose termin-
in some
instances,
broken
wires making partial connection.
SWITCH POSITIONS AND TERMINALS CONTACTED. AVERAGE
1.
B.S.
switch "on", all other switches
and telescope
light at minimum.
Contact
2.
3.
poles #l and
#2.
4 ohms
Bon* switch and bubble light switch
Contact poles
# and #2.
3 ohms
B.S. bubble
light "on"
, telescope
light at maximum. Contact poles
3. 5 ohms
# 1
and #2..
4.
Match telescope quadrant and rate
quadrant indices, raise
trigger
and contact poles #3 and #4
6 pole
plug.
0 ohms.
1.
2.
3.
B.S. switch
#or=. Contact poles
#15
and 13.
12 ohms
Bon:. swonta
ang
telescope
• Contact poles #13
loght
and #15. 10 ohms
Match telescope
quadrant and rate
quadrant indices and
raise
trigger.
Contact poles #6 and #7. If ra-
the
brush
This
denotes
als
in
147