Cleaning Contact Points (Regulator) - Piper PA-24 Comanche Service Manual

•
•
PIPER COMANCHE SERVICE MANUAL.
c. The regulator must be mOWltK in the aperatinl poaition wben electrical setlinls
are
cbecked and adjusted and it must
be at Opuatilll
temperature.
d. Specified leaerator speeds
for testiDl ud. adju.sWII.
1. Voltag.
R.Kwatcr
(a)
Operatinl .peed.
2.
ClUreIll
Replator
(a) All . . . .tcr. must he operatR.
at
a speed .ufficiellt to produce current in excess
of
specifi.s
settinl.
(b) Volt..e
of the ....
erator
aut
be Icept
hip
noup
to iII.1IN .ufficiftt CIlttent
eat-
put, but below the operatilll voltate
of
the volta.. Naulalor lUlU.
e. After any t.sts or adjustJlleDts the I_rater aD the airaaft must
be polarizedaft.r leads
are coanected, but before
the mime
i.
~ ,
• follows:
After recoanectiDg le-.;l., momentarily caanect a jumper lead between the "GEN" and
"BAT" terminals of the reaulator. This allows a lIIG1lelllary surae of cutreat to fiow throulh the
aeaerator which correctly
polarize. it.
FaUme to do thi:l lIIay
result i.a severe
dam.. e to
the
equipment sitlee reversed polarity call.e, vibratioa, uciDa. ud bumilll of the relay ccntct points.
9-30. CI..
ning
COfttaet Point•. The coatact point. ol a rellllatcr will not operate indefinitely
without some atteutiCll. It ha. been fouad dlat a peat lIIajority ol
aU relUlator trou.ble can be
elwinated by
a simple cleaaial of
the
CaDtacl poiata, plus SClIH pa.sible readjUlItllumt. The
flat
poiats ShClUld
be
cleaned with a
,poas
or riffler file. OIl neptive pouadeci relulatcxs wbich bave
the nat
cOQtaet
point
OIl the
r.aul.tor _atura, lex.en the
CClIltaet bracket IIIClWltUlI screws so
that the brac.t can be tilted to
ODe
sid•• A flat file
CMaot
be ued successfully to clean tbe
nat c:ontct poiDts aince it will,not tINCh the center
of
the flat pomt where poiat .... i. lIlalt apt
to occur. H."., u......,y cloth .......
paper t.
elMn the e....et
,oint••
Remove all the ozides
from the contact points but !lote that it is
Got
_canary
to remove
any
caVity thay may have
d.veloped.
•
TO Q.lAN CONTACT
~INTS
(l.OO. . . " ' " ' COHfACT
.IACJCIT MOUNTING lcatwsl
FIGURE 9·4. USE OF RIPPLE FILE TO
CLEAN CONTACT POINTS
ELECTRICAL SYSTEM
ISSUED: 8/18/72
CONTACT
MOUNTING SCIEWS
(LOOIIN TO Ill ....
GAl')
FIGURE 9-5. VOLTAGE REGULATOR AIR
GAP CHECK AND ADJUSTMENT
3
A24