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METAL DETECTOR DIAGNOSTIC SHORT PROCEDURE
Use this list to quickly diagnose the majority of problems
related to the metal detector. For a more complete de-
scription and analysis in the event a problem cannot be
solved, refer to the FH0702 (or subsequent version) ser-
vice bulletin.
Before analyzing the problem, make sure:
Wiring:
• Battery cables are tightly connected, clean and
rust free.
• The control box is connected and connectors
are clean.
• The connector between the tractor and Forage
Harvester is clean, rust free and all rods are
properly aligned.
• Tighten all cables and check connections in
the tractor’s control box.
Forage Harvester’s electronic circuit:
• Green connectors are clean, rust free and
properly tighten.
• A minimum of 12V is measured at the power
entry between white and green wires.
Sensor:
• When transmission is switched to NEUTRAL,
the S1 sensor is turned on.
• When transmission is switched to FORWARD,
S1 and S2 sensors are turned on.
Detection sensor (antenna):
• Disconnect wires on sensor (#1, 2 and 3).
• Resistance between the white and black wires (or
red and black) is approximately 900 to 960 Ohm (do
not touch the wires with ngers).
Solenoid:
• The solenoid is properly connected, wires are
shielded and piston is free to move.
• The chain on the solenoid is properly adjusted.
See ADJUSTMENTS - MAINTENANCE
section (page 102)
• Check solenoid coils (page 102).
PROBLEMS:
Problem 1 : Impossible to initialize the system or to
switch it to the forward position.
• With tractor engine switched off, disconnect
the detection sensor (antenna), and try again.
• Check resistance on sensor, wire condition or
the presence of an external magnetic eld.
• Update, repair or replace electronic card.
Problem 2: False detection or random and frequent
stops.
• The feed roll is well secured and in good
condition.
• The shock absorbers on the rolls are in good
condition.
• When machine is off, initialize the system and
hit detector roll with a piece of wood. If a
detection occurs, replace a bearing in the
detection roll or check for faulty antenna.
• Check bolts on detection roll (stainless, non-
magnetic bolts only)
• Remove detection roll and remove any metal
debris inside.
• The solenoid is well adjusted.
• The transmission sensors are positioned
properly and tighten.
• Wires are free and not pinched.
• Replace electronic card.
Problem 3: The system won’t detect or does not detect
properly during static tests.
• Check and clean connections; check wires and
cables.
• Check detection sensor (antenna).
• Replace electronic card.
Manual No. F4117E987E V1.1
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