Troubleshooting Chart (Engine Synchroniser) - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE XIV-XVI. TROUBLESHOOTING CHART (ENGINE SYNCHROPHASER)
Trouble
Cause
Remedy
No indication solenoid
current.
Master switch OFF.
Bad fuse in computer.
Turn switch ON.
Replace fuse.
Faulty wiring.
Faulty computer.
Check wiring and
connections.
Replace computer.
System not operating
properly.
Pulse generator and lamp
amplifier suspected of
faulty operation.
Perform operational check.
Tach shafts and/or dual
drive units faulty.
Pulse generator and glow
lamp amplifier in computer
not operating.
Glow lamp or lamps and/or
photo conductor or con-
ductors defective.
Faulty computer.
Visually check.
Perform electrical test.
Replace glow lamp or photo
conductor assemblies.
Perform electrical test.
Perform electrical test
Check tach shafts and dual
drive units.
Refer to operating
procedures.
System will not sync.
NOTE: Unit will not sync.
on the ground.
Electrical.
Mechanical.
Pilot.
Engines not set within
range of system.
Reissued: 9/23/80
4120
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