LESSON SUMMARY: This lesson is designed to assist the user in troubleshooting what is causing the 1-Amp or 3-AMP fuse to blow on the Timing Mechanism.

Special Tools Needed: Flathead Screwdriver

⚠ CAUTION: THIS LESSON MAY INCLUDE INSTRUCTIONS TO TEST HAZARDOUS VOLTAGES (120V-240V) THAT CAN CAUSE SERIOUS INJURY OR DEATH. IT IS RECOMMENDED THAT A LICENSED ELECTRICIAN BE CONTRACTED TO PERFORM SUCH TESTS.

🛑 STOP: ALWAYS TURN OFF THE POWER TO THE SATELLITE BEFORE REMOVING OR INSTALLING ELECTRONIC COMPONENTS.

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*These instructions apply to the SuperParts™ Timing Mechanism for Network LTC® Version 1.

If a SuperParts™ Timing Mechanism for Network LTC® Version 1 is blowing the 1-AMP or 3-AMP Fuse, the Timing Mechanism, one or both of the Switch & Surge Boards, or one or more solenoids may be damaged. Follow the guided steps below to determine which components require replacement.

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Testing the Timing Mechanism

SuperParts™ Timing Mechanisms for Network LTC® Version 1 come equipped with two blade-style fuses: one 1-AMP Fuse that protects the system in the event of a logic circuitry overload and one 3-AMP Fuse that protects the system in the event of a field solenoid overload.

The 1-AMP Fuse is located in the lower left-hand corner of the Timing Mechanism, above the power cable connector. The 1-AMP Fuse is black in color and is labeled “1-AMP Input Fuse” on the Timing Mechanism.

If the 1-AMP Fuse is blown, the Timing Mechanism will not power on when power is applied.

If the 1-AMP Fuse has been replaced with a known working 1-AMP fuse and the known-working fuse blows when power is applied to the Timing Mechanism, the Timing Mechanism is damaged and should be replaced.

The 3-AMP Fuse is located next to the 1-AMP Fuse in the lower left-hand corner of the Timing Mechanism, above the power cable connector. The 3-AMP Fuse is purple in color and is labeled “3-AMP Output Fuse” on the Timing Mechanism.

If the 3-AMP Fuse is blown, the Timing Mechanism will not send power to the solenoids.

If the 3-AMP Fuse has been replaced with a known working 3-AMP fuse and the known-working fuse blows when power is applied to the Timing Mechanism, the Timing Mechanism, one or more solenoids, or one or both Switch and Surge Boards are damaged.

Proceed to isolate the solenoids from the Timing Mechanism to determine which component(s) is damaged.

Start by powering off the Timing Mechanism by unplugging the 4-pin power connector from the Timing Mechanism.

If the satellite has the field wires connected to a wiring harness that is plugged into the edge connector on the lower right-hand corner of the Timing Mechanism, unplug the wiring harness from the edge connector.

If the satellite has the field wires screwed directly into a green block screw terminal in the lower right-hand corner of the Timing Mechanism, locate the COMMON wire and, using a flathead screwdriver, loosen the screw holding the COMMON wire and release it from the terminal block.

Proceed to install a new or known-working 3-AMP Fuse on the Timing Mechanism.

Plug the 4-pin power connector back into the Timing Mechanism.

If the 3-AMP fuse blows instantly, this indicates the Timing Mechanism is damaged and needs to be replaced.

If the fuse does not blow upon applying power to the Timing Mechanism, run a Station Test as follows:

Press the DIAGNOSTICS button, which is located directly above the STOP button.

Rotate the knob clockwise until the display screen reads “Menu: Station Test”.

Press the down navigational arrow button to move the blinking cursor onto the second line if the display screen.

Press the START button to begin the Station Test.

Rotate the knob to advance through all of the stations.

Press the HOME button to end the Station Test.

Check the 3-AMP Fuse. If it is blown, this indicates the Timing Mechanism is damaged and needs to be replaced.

Replacement Timing Mechanisms for Network LTC® Version 1 can be purchased here.

If the 3-AMP Fuse is not blown upon applying power to the Timing Mechanism, power off the Timing Mechanism by unplugging the 4-pin power connector and reconnect the COMMON wire, then follow the online lesson for testing solenoids and the online lesson for testing a Switch & Surge Board.

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Lesson tags: toro, network ltc, toro network ltc, network ltc repair, network ltc help, network ltc troubleshooting, network ltc exchange, network ltc motherboard, network ltc surge board, network ltc surge, wiring harness, solenoid test, boardtronics

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