Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Game Consoles & Other Weird Devices
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 01-02-2015, 04:37 PM   #1
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Help with Motor Control Board - ProForm treadmill

I have a ProForm treadmill and I believe the motor control board went bad. All the functions work except power to the motor. I tested the motor and it is fine. A replacement board cost minimum of $130 so I would like to try to fix myself. Everything looks fine on it except by two resistors where the board turned brown like it was too hot. I tested the resistors continuity and I get a beep so I assume they are fine. The only other thing is at the base of the relay it looks like a water stain or something which you can scrape off. Does anyone know if either of these could be the problem with the motor not getting the power sent to it?
Attached Images
File Type: jpg IMG_3291.jpg (726.3 KB, 130 views)
File Type: jpg IMG_3304.jpg (634.8 KB, 112 views)
File Type: jpg IMG_3301.jpg (454.0 KB, 90 views)
File Type: jpg IMG_3318.jpg (589.9 KB, 98 views)
File Type: jpg IMG_3320.jpg (491.2 KB, 71 views)
File Type: jpg IMG_3292.jpg (754.5 KB, 90 views)

Last edited by Crrose; 01-02-2015 at 04:41 PM.. Reason: add photos
Crrose is offline   Reply With Quote
Old 01-02-2015, 05:10 PM   #2
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: Help with Motor Control Board

How many wires are there on the Motor? Can we see how the motor is connected to the PCB?
The more details pictures we have the more clue we will know how it is setup.
More likely dc motor, and those two resistors may be for braking.
__________________
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809

Last edited by budm; 01-02-2015 at 05:12 PM..
budm is offline   Reply With Quote
Old 01-02-2015, 05:10 PM   #3
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,839
Default Re: Help with Motor Control Board

check the parts on the heatsink.
stj is offline   Reply With Quote
Old 01-02-2015, 05:31 PM   #4
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,411
Default Re: Help with Motor Control Board

On some of these treadmills they have a safety switch on the control panel. If this switch in not on the power will not go to the motor.
keeney123 is offline   Reply With Quote
Old 01-02-2015, 05:40 PM   #5
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: Help with Motor Control Board

Quote:
Originally Posted by keeney123 View Post
On some of these treadmills they have a safety switch on the control panel. If this switch in not on the power will not go to the motor.
Good point, may be one on the running board also.
budm is offline   Reply With Quote
Old 01-02-2015, 06:14 PM   #6
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Ok the motor has 4 wires coming from it and it is a DC motor. I hooked an 18 volt drill battery to it and it runs fine. I also checked the safety key, when it is removed all the power to the machine goes off and once I reinsert it the power goes back on. There are 4 wires from the motor 2 blue a black and a red. Black and red go from board to motor, one blue from AC1 on board to motor and the other blue to the other board along with the AC2 white. The only other wires from board to board are the 3 red/wht/blk speed control wires. I included pictures of it all along with the Voltage diagram. The one picture of the bottom of the board is beneath the 2 resistors.
Attached Images
File Type: jpg IMG_3322.jpg (577.5 KB, 58 views)
File Type: jpg IMG_3332.jpg (705.0 KB, 63 views)
File Type: jpg IMG_3331.jpg (694.3 KB, 50 views)
File Type: jpg IMG_3329.jpg (680.5 KB, 51 views)
File Type: jpg IMG_3328.jpg (599.5 KB, 56 views)
Attached Files
File Type: pdf Voltage Diagram.pdf (1.75 MB, 45 views)
Crrose is offline   Reply With Quote
Old 01-02-2015, 07:50 PM   #7
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: Help with Motor Control Board

So the resistance between the two blue wires (for thermal shutoff switch) show <1 Ohm?
What are resistance readings of the DZ1, DZ4 in the over heated area of the two resistors?
Can I also get the straight shot pictures of the whole top and bottom side of that motor control board?
Do you also hear that 24V 30A contact rating even click on, off?

Last edited by budm; 01-02-2015 at 07:55 PM..
budm is offline   Reply With Quote
Old 01-02-2015, 09:37 PM   #8
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: Help with Motor Control Board

oops, wrong post.

Last edited by budm; 01-02-2015 at 11:00 PM..
budm is offline   Reply With Quote
Old 01-02-2015, 10:36 PM   #9
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,839
Default Re: Help with Motor Control Board

i/v worked on stuff like this in the past and it was often the scr's / triacs
so what are the parts on the heatsink?
stj is offline   Reply With Quote
Old 01-03-2015, 01:40 AM   #10
Toasty
Badcaps Veteran
 
Toasty's Avatar
 
Join Date: Jul 2007
City & State: East Coast, USA
Line Voltage: 220-221
I'm a: Professional Tech
Posts: 4,145
Default Re: Help with Motor Control Board

Does anything light up?

I'd bet your on the right track and there's a problem with the Zener's under the two stand-off power resistors. Could be they're shorted and that might be why you get a beep when testing the resistors. Any values on those resistors?

T
__________________
veritas odium parit
Toasty is offline   Reply With Quote
Old 01-03-2015, 03:52 PM   #11
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Everything lights up like it is supposed to, the motor just will not go on. I tested the resistance on those 2 diodes and it is 0 but they have continuity. What is the diode below the Zenner. It has 24 C838 written on it, that is all I can see with it on the board.
Crrose is offline   Reply With Quote
Old 01-03-2015, 04:12 PM   #12
selldoor
Slow Learner
 
selldoor's Avatar
 
Join Date: Dec 2010
City & State: Lancashire UK
Posts: 7,853
Default Re: Help with Motor Control Board

These things usually come up with an error code E01 E03 E31 and so on
Does yours - then search for the board number and error code?
selldoor is offline   Reply With Quote
Old 01-03-2015, 04:12 PM   #13
Toasty
Badcaps Veteran
 
Toasty's Avatar
 
Join Date: Jul 2007
City & State: East Coast, USA
Line Voltage: 220-221
I'm a: Professional Tech
Posts: 4,145
Default Re: Help with Motor Control Board

They're both Zeners.

T

Edit: They should act like diodes. Continuity one way but not the other. You may need to unsolder one leg of each to test correctly.

Last edited by Toasty; 01-03-2015 at 04:18 PM..
Toasty is offline   Reply With Quote
Old 01-03-2015, 05:11 PM   #14
Toasty
Badcaps Veteran
 
Toasty's Avatar
 
Join Date: Jul 2007
City & State: East Coast, USA
Line Voltage: 220-221
I'm a: Professional Tech
Posts: 4,145
Default Re: Help with Motor Control Board

The black Zener diode is likely a 24v one. Reasons out because the relay is 24vdc. The smaller one is probably a 5v. If you -carefully- read across them with it on and get those voltages, then the basic part of the PSU is okay.

Could the motor have burned out?

T
Toasty is offline   Reply With Quote
Old 01-03-2015, 05:18 PM   #15
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,839
Default Re: Help with Motor Control Board

these things are pwm drive.
you really need to trace the motor drive back through the board.
stj is offline   Reply With Quote
Old 01-03-2015, 06:48 PM   #16
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,411
Default Re: Help with Motor Control Board

I would check AC1 contact blue wire to AC2 contact white wire. To first see if you are getting 120 AC. If not it could be the thermal switch is bad. If you have 120 volts at that point. Then something on the speed control board is bad and a good stop to look at would be were the burn spots go to on the speed board. I have seen SCR (Silicon Control Rectifiers) blown apart when something stops the motor from turning.
keeney123 is offline   Reply With Quote
Old 01-03-2015, 07:04 PM   #17
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,411
Default Re: Help with Motor Control Board

Also, check the black, white, and red lines to make sure the speed board is getting +5 VDC red to black and -5 Volts DC white to black. I would think this should be there is everything else powers up but you never know.
keeney123 is offline   Reply With Quote
Old 01-03-2015, 07:59 PM   #18
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,411
Default Re: Help with Motor Control Board

Quote:
Originally Posted by keeney123 View Post
Also, check the black, white, and red lines to make sure the speed board is getting +5 VDC red to black and -5 Volts DC white to black. I would think this should be there is everything else powers up but you never know.
I would set the drive motor to as fast as it can go from the main console. Then as slow as it can go. I would expect one voltage reading in one mode and another in the other mode. These are actually pulse width modulation DC. I think these must feed the gate voltages of the SCR telling it when to turn on and for how long. The AC voltage on the speed board must get converted to High Voltage DC which pulsates at a steady rate and when both +5 volts DC and the High voltage DC are low the motor turns off. Perhaps the neg 5 volts is used as a breaking voltage for the motor which turn on a negative going SCR High Voltage DC.
keeney123 is offline   Reply With Quote
Old 01-03-2015, 08:03 PM   #19
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Selldore: There are no error codes that come on. Looks like normal, just doesn't run.

Toasty: The motor is not burnt out, runs when hooked to 18v battery.

Keeney123: I do get 120V on the AC1 and AC2. I will have to re-install the board to measure the black white and red but if I remember correctly I did get a reading from it earlier.
Crrose is offline   Reply With Quote
Old 01-03-2015, 08:07 PM   #20
Crrose
Senior Member
 
Join Date: Dec 2013
City & State: Brea ca
My Country: Usa
I'm a: Knowledge Seeker
Posts: 149
Default Re: Help with Motor Control Board

Quote:
Originally Posted by keeney123 View Post
I would set the drive motor to as fast as it can go from the main console. Then as slow as it can go. I would expect one voltage reading in one mode and another in the other mode. These are actually pulse width modulation DC. I think these must feed the gate voltages of the SCR telling it when to turn on and for how long. The AC voltage on the speed board must get converted to High Voltage DC which pulsates at a steady rate and when both +5 volts DC and the High voltage DC are low the motor turns off. Perhaps the neg 5 volts is used as a breaking voltage for the motor which turn on a negative going SCR High Voltage DC.
I will do this tomorrow after I put everything back together. I removed the board from the mounting plate and have to get some heatsink paste.
Crrose is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 01:11 PM.
Did you find this forum helpful?