I bought an used b23, light works but no motor response, even no hum, I checked the wiring from HO seeker they look correct. What debugging step would you recommend? Thank you in advance !
http://hoseeker.net/assemblyexplosionbachmann/bachmannb237instrpg2.jpg
Are you able to remove the motor and power it directly? If so, and if the wiring is correct, the wheels may be dirty, or the springs from the trucks may not be making good contact with the frame.
_________________________________________________________________
How about a name? Forum protocol.
Link does not work. Permission denied has been happening to some here and in the MRH forums.
Get your ohm meter out and do some continuity checking and see if the motor is fried, poor motor connection, etc.
A couple pieces of wire connected to the power pack and motor would work. Those motors are pretty good.
I am looking at the photo at HO Seeker.
FYI. Bachmann sells replacement motors. I suspect a contact issue.
The diagram does not show quite enough detail. I looked at the Bachmann site also.
Here is the diagram from the Bachmann site. From what I can see, the wires from each truck go to the motor and there are two metal contacts from the PC board to power the lights. I also looked at the replacement PC board.
http://www.bachmanntrains.com/home-usa/dwg/dwgs/HO_B23-7_DIESEL.pdf
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
The problem is I found it hard to remove the motor, I try to pry the clip but doesn't work, the screws are removed from the bottom but still hold pretty tight... any advice will be really appreaciated.
I can see the two screws, #6185, that secure and screw holders. If I see it correctly, the motor is not atteched to the screws. I believe the motor is a press fit into the frame. Expanding the PDF, the frame appears to be milled to fit the motor housing.
Not sure about the two motor brackets,
Below is the motor picture from the Bachmann parts list.
http://estore.bachmanntrains.com/images/ho_parts/H11103.jpg
If I see the diagram correctly, with the shell pulled, you can put your ohm meter probes on the motor contacts. You should see under 100 ohms.
It appears the PC board is attached to the shell and presses onto the contact plate.
The B23 that comes with DCC onboard does the same. Connects to the contact plate.
I have been looking at the Bachmann site with parts list.
Thanks Rich! I was able to rotate the motor, and exposed a little metal piece from the bottom of the motor, maybe the one seen from the motor picture. Is it supposed to be connected to the chassie?
Then I followed your advice and measured the ohm from top and bottom of the motor, it shows 1 ohm. then I applied 5V to top and 0v to bottom, motor didn't turn. but when measured using voltmeter for top & bottom it shows 5V
What should I do next? Is the motor bad?
Thanks!!
The motor should turn at 5 volts. Any spark at a test lead when connecting the volrage? That would indicate current flow. If the motor has a defective coil, might take more voltage to start but from my experince, 5 volts should make a motor start running when out of the loco.
Spin the flywheel and see if the motor starts turning by itself with power connected. If it does, defective motor. If the motor has a defective coil, might take more voltage to start but from my experince, 5 volts should make a motor start running when out of the loco.
I cannot tell from the diagram if power comes from the front truck up through the frame. Do a visual with your ohm meter starting at the wheels on each truck. That is what I do when trouble shooting loco pickup issues.
The diagram shows power from the rear truck to the top motor contact.
Using the amp meter part of your meter would show what current is flowing. I would expect about 500 ma to 700 ma current at 12 volts when running.
Bachmann still sells the motor.
If no one else answers here, you can join the Bachmann HO forum and ask. Many users of Bachmann products there with company reps.