MTH Freight Truck with Operating ETD 30-76645
Repair End of Train Device flashing LED.
Replacement Truck
Repair or Replace when LED malfunctions?
When the LED quits, MTH does not sell the
replacement ETD. The MTH repair part is the complete truck.
Replacement Trucks available are Trucks 20-89010 Yellow or
20-89013 White.
The following repair shows whether repair or Truck Replacement is
best.
After repairing the ETD it's preferable to buy the replacement
truck. Repair is possible.
Original Parts
Opening the ETD may be optional if the
LED tests okay. Pull wire out of coupler to enlarge coupler
wire way.
The ETD Housing Cover is a press fit
onto the coupler mounted yellow ETD housing.
The LED assembly is carefully shaped for a tight fit in the housing.
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| LED Front with Shaped Assembly | Evans Design
LED Assembly at Top Original LED Assembly at Bottom |
Replacement Parts and Special Tools
Parts:
LED assembly from Evan Designs (ModelTrainSoftware.com)
The smallest flashing LED is red Part #52204.
Part #52204 = Slow-Flash-LED Red 2.8mm red only 7-19 volt AC/DC with 30 gauge wire.
Misc. in stock: Wire sleeve, liquid
tape, heat shrink tubing, and 32 gauge tie wire.
Special Tools:
22 through 30 gauge wire stripper, 7/64 " drill bit for wire
sleeve, and safety pin clamps
Enlarge Wiring Channel in Coupler
The MTH ETD wire insulation is so fragile it
needs a wiring sleeve for protection.
Sleeving from low voltage multi wire signal cable works.
Enlarge the wiring channel with a 7/64" bit.
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| 7/64 " drill bit in enlarged hole | Coupler with enlarged hole |
Install New LED Assembly
Prepare to Lengthen new LED Wire Between ETD and
Circuit Board Box Location.
At this point test the MTH LED. You may be able to leave it in
place for the Evan Design circuit.
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| Insert sleeve in coupler followed by ETD wires. | Slip heat shrink over wires and
solder assembly wires together with correct polarity.
Clamped circuit box in place helps gauge in line circuit
position. Test circuit with 18V. New circuit fits in the box at an angle. It may be easier to secure new heat shrinked circuit without the Circuit Box. |
Assemble and Install Truck
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 The fine wire holds the truck springs while inserting with tweezers. The toothpick is used to apply liquid tape as needed. |
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Repaired and Running
Handling the ETD during repairs broke the antenna.
The MTH LED circuit creates a flaring blinking LED. The Evan
Designs circuit just flashes.
See Video with Flashing on Test Track. Video can be viewed with Windows Explorer browser.
MTH Circuit Board Removed
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