Piper PA-32R-301T SARATOGA S, Maintenance Manual

Page: 436 / 956

PROPELLER DEICING SYTEM (Cont.)
C. Troubleshooting (Cont.)
Chart 4.
Troubleshooting Propeller Deicer System
(Sheet 3 of 4)
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
30-60-00
Page 30-30
Reissued: July 1, 1993
2H24
Trouble Cause Remedy
Ammeter shows excess current Ammeter faulty. Test for voltage up to and out of
over entire cycle. ammeter. If low or zero output
and input satisfactory, replace
ammeter. If no voltage to
ammeter, locate and fix open
between switch and ammeter.
Ground between ammeter and Disconnect harness at timer and
timer. with ohmmeter check from pin B
(of harness) to ground. If ground
is indicated, locate and correct.
Ammeter shows normal current Ground between timer and Disconnect leads at brush block
part of cycle, excess rest of cycle. brush block. and, with ohmmeter, check from
power leads to ground. If ground
is indicated, locate and correct.
Ground between brush block If no short exists at brush slip
and deicers. (Excluding ground ring contact check for ground
brush circuit.) from slip ring lead to propeller
assembly while flexing slip ring
and deicer leads. If a ground is
indicated, locate and correct.
Short between two adjacent Check for cuts or low resistance
circuits. between circuits, if any, locate
and correct.
Timer faulty. Test timer as in Timer Test at
end of chapter.
Ammeter does not “flick” Timer ground open. Disconnect harness at timer and
approximately every 30 seconds. check with ohmmeter from pin
A (of harness) to ground. If no
circuit, fix open per schematic
diagram.
Timer contacts are welded Test timer as in Timer Test at
(caused by short circuit in end of chapter. If timer does not
system). cycle with voltage at pin B,
replace timer but be sure short
causing original failure has been
located and corrected.