PIPER COMANCHE SERVICE MAN(;AL
"aTE
A
short of
the
type described in steps I
and
2
"ill
not cause
perma-
nent
damage
to
the power supply but the
sy"em
will
be
inoperati,e
if such a
short
exists.
A,oid
any
connection between pins I
and
3
of
the
interconnecting cable
as
this will discharge
the
condenser
in
the
power
supply
and
destroy the trigger circuit
CAUTIO"
When
disconnecting the
power
supply allow five minutes
of
bleed
down
time
prior
to
handling
the unit
c Check interconnecting cables for
shorts
I
Disconnect
the
output
cables
from
the power supply outlets.
2
The
following continUity r
'ecks
can be
made
with
an
ohmmeter
3
Check
for
continuity
bet
.'n
the
connectors
of
each
interconnecting cable by checking from
pin I to pin I. pin 2
to
pin
2.
and
pin 3 to pin J
When
making
these checks if no
continuity
exists the cable
is
opened
and
should be replaced
4
Check
continuity
between pins I
and
2.
I
and
J.
and
2
and
J of
the
interconnecting cable
II
l"ontinuit,· exists between
any
of
these
connections
the cable
is
shorted
and
should
be
replaced
5 Check for
continuity
from pins I. 2
and
3 to
airplane
ground
If continuity
exi",
the canle
i,
shorted
and
should be replaced
d Check the
tube
socket assembly for
shorts
I Disconnect the tube socket assembly of the anti-collision light from the interconnecting
cabk
2
The
following continUity checks can
be
made
with
an
ohmmeter
3
Check
for
continuity
between pin I of
amp
connector
to
pin I
of
tube socket. pin 2 of
a.
connector
to pins
(,
and
7 of tube socket
and
pin J
of
amp
connector
to pin 4
of
tube
socket When
makl.
these tests
if
no
continuit,
eXISt' the tube socket a55embl,
is
opened
and should be replaced
9-111. Installation Of Anti-Collision Light.
a Plug
in
new
lamp
using correct
number
b Replace light cover.
c Tighten screw in
clamp
to secure light cover
9-112
Troubleshooting.
Troubles
peculiar to the
Comanche
electrical system
are
listed
in
Table
IX-III at
the
back
of this section
along
with their
probable
causes
and
suggested remedies
The
wiri ng
diagrams
included
in
this
manual
will give a physical
breakdown
of
the different electrical circuits used
in
this airplane. (Refer
to
Table
IX-IV)
After the
trouble
has been corrected. check the entire electrical
sy"em
for security
and
operation
of
its
components
REVISED:
4/10/81
3D2
ELECTRIC
AL
SYST_
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