Lincoln Electric SVM133-B service manual Idler Solenoid Test, Test Procedure

Return to Section TOC

TOC

Return to Master TOC

TOC

F-34 F-34

TROUBLESHOOTING & REPAIR

IDLER SOLENOID TEST (continued)

FIGURE F.8 – IDLER SOLENOID LEAD TERMINALS

PULL-IN COIL (LARGER TERMINALS TOP AND BOTTOM #227 AND #254)

SHUTDOWN

SOLENOID

HOLD-IN COIL (SMALLER TERMINALS

TOP AND BOTTOM #226 AND #237)

IDLER

SOLENOID

Return to Section

Return to Section TOC

Return to Section TOC

Return to Master

Return to Master TOC

Return to Master TOC

TEST PROCEDURE

1.Turn the engine off.

2.Unlatch, lift and secure the right side engine service access door. Using a 5/16”, open the control panel and tilt out. Remove the control board cover.

3.Check the pull-in coil resistance by discon- necting lead #227 from the B1 terminal at the control board and measuring the resis- tance from lead #227 to the ground screw at the control board. Normal coil resistance is approximately 0.4 ohms. Reconnect lead #227 to the B1 terminal at the control board.

Check the hold-in coil resistance by discon- necting J3 from the control board and mea- suring across pins 3 & 4. Normal coil resis- tance is approximately 20 ohms. Reconnect J3 at the control board.

If either coil resistance is incorrect, the wiring may be faulty. Inspect the solenoid leads for faulty or loose connections.

If the lead connections are OK, recheck the coil resistance directly across the solenoid. If the coil resistances are incorrect, the solenoid may be faulty. Replace.

4.Using the external 12VDC voltage supply, apply 12VDC to the larger idler solenoid ter- minals (#227+ to #254-). The solenoid should activate.

CAUTION

When the solenoid activates, remove the voltage supply immediately. Do not leave the external supply connected to terminals #227 and #254 for longer than three seconds. Component damage could result.

The solenoid should deactivate when the 12VDC supply is removed.

5.If the solenoid does not operate properly, check for a mechanical restriction in the linkage.

6.Using the external 12VDC voltage supply, apply 12VDC to the smaller idler solenoid terminals for the hold-in coil (#226+ to #237-). Push in the solenoid plunger. With 12VDC applied to the hold-in coil, the plunger should stay in until the 12VDC is removed.

7.If the linkage is intact and the solenoid does not operate correctly when 12VDC is applied, the solenoid may be faulty. Replace.

8.Replace the harness leads to the correct terminals. See Figure F. 8 and the Wiring Diagram. Replace any previously removed wire wraps.

8a. Using the control PC board layout, locate

Q21 on the control board. Scrape the envi- ronmental coating from all three legs of the device, and check the resistance between all three legs. If there is continuity between any of the legs, Q21 is bad. Replace the control PC board.

9.Close and secure the right side engine ser- vice access door. Replace the control board and close the control panel.

COMMANDER 400