I have MC2100WAM that has no silkscreen on HD2 the connector in. the lower left with the empty red MTA connector in pic #938 . A google gets me no where . Any folks here know what the pinouts are for this controller ? Does it still require a 20hz PWM signal ?
thank you
animal12

 

Here is the reverse-engineered schematic.
https://forum.allaboutcircuits.com/...or-control-circuit.100678/page-2#post-1267375
MC2100 requires a 20hz PWM signal into pin 4 of HD2.
You also have to increase the resistor (in series) with the opto input, depending on the level of the signal you are using.

 

Thanks , I'll see if it has what I'm after . My 2100 does not have the transformer mounted on the board . There is a transformer a bit larger than the ones I'm used to seeing on these 2100's , but it has 2 plugs that plug into the MC2100WAM & the transformer is mounted on the TM frame . I'm wondering if the power pin 8-12 volts on HD2 get's its power from the external transformer ? Have you ever seen a MC2100WAM ?
thanks
animal

 

I have seen the versions with the remote mounted transformer, they were few and far between I

 

Well it turns out that my MC2100WAM is bad . The led lites up , but there is no voltage on 8-12 VDC pin on HD2 & There is no pulse on the tach pin when I run a magnet back & forth on the reed switch . I need to find a new MC2100 .
thanks
animal

 

As an objective reader, I have a problem with posts that say "my 112820sdfsd-xx00212" doesn't work.
Be kind and write a descriptive title, so we know that the thing even is before investing the time to google the part number.

Of course you need the number, but at least mention what the darn thing is.

 

Well it turns out that my MC2100WAM is bad . The led lites up , but there is no voltage on 8-12 VDC pin on HD2 & There is no pulse on the tach pin when I run a magnet back & forth on the reed switch . I need to find a new MC2100 .

Should be simple to trace if it is simply that you do not have the LV DC , there were several methods used in these various versions of the board,
Seems that yours has the external transformer, which was just a simple rectifiers and electrolytic on the output after the secondary is input.
Do you have the AC in?
.

 

For those not familiar with a MC2100 , it's a motor control board for a treadmill motor . Yea I have AC in . The led lites . I get no pulse from the tach signal when running a magnet on the reed switch . The motor is good . I'm not a electronics wizz , what does the ACV transformer do ?
thanks
animal

 

Pin 1 & 8 of HD2 is LV common, you should read ~12vdc from either 1 or 8 to pin 2 .
Are you intending to use this on a TM or for a stand-alone motor control?

 

Standalone motor control . There is no voltage between pin2 & pin 1 or pin 8 . I would like to figure out why I have no power there .
thanks
animal

 

The LV supply is missing, very simple circuit to fix, usually.
Your board appears to need the external transformer?

 

Yes , I have the transformer . It'a a ACV in & AVC out , I don't have it in front of me rite now , but I recall it saying 22 VAC out . I'll check that . SO some boards have the transformer mounted to the board & some have it loose . what does this transformer do ?
thanks
animal

 

It provides the LV DC to the board, the capacitor and two large rectifiers can be seen in bottom left of your first pic.
BTW, to run it stand-alone you will need the 20hz PWM into pin 4 of the HD2.

 

I know about the 20 hz PWM to run it . I had a small PWM generator hooked up to the 8-12 VDC pin & one of the grounds & the PWM output on the PWM generator to the PWM pin & the other ground . all of these pins are on the HD2 header . Is there something I can test using a DVM ?
thanks
animal

 

First you need to supply the LV AC power i.e. connect the external transformer you should then have DC LV on Hd2 header pins.
Do you know about putting a suitable series resitor in HD 4 input to suit the opto?

 

I have supplied the AC Line Voltage to the board , the LED lites but there is no voltage at HD2 . No I have not heard of the resistor . Can you please fill me in on that ? I didn't do that on my other 2100 that works just fine .
thanks
animal

 

I am not talking about the line voltage!
If you don't have a LV transformer on the board, it is the version with the external one which you require.!
The 817 opto requires a series resistor as usually only aa very low value is fitted on the board, it depends on what level of signal you are supplying from the PWM input.

 

Here's what I know .
1 . I have the MC2100 that has the external transformer .
2 . I have the external transformer & it is hooked up to the board like it would be if it was still in the treadmill .
3 . With everything hooked up like it was still in the Treadmill I have AV power to the board .
4 . The external transformer label says the output is 20 VAC I have 12 VAC on each leg with no load .
5 . When I apply power to the board the red led lites & stays lit .
6 . There is no power to any of the pins on HD2 . No 8-12 volts on either pin 7 or pin 2 . I don't recall which side is pin 1.
7 . There is no signal on either pin 3 or pin 6 ,the green wire when I run a magnet back & forth on the tach reed switch once again I don't recall which pin is pin 1 .
8 . When I plug my PWM generator in to the 2 grounds , the power & PWM pins I get nothing the PWM Controller does not even come on .
9 . I may be at a standstill for a few days , when I got up from my bench the cable for the PWN generator was wrapped around my cane & I pulled the generator to the floor , it will not power on any more . I ordered another which should be here Wednesday or Thursday . This is what I had & dropped & what I ordered again today .
10 . From what I've read I need to supply the board with a 20 hz PWM signal . I have not seen anything about a resistor in any of my reading .
11 . My other machine has a MC2100 with the transformer running off a small board with a pic I bought off a guy on one of the forums .
12 . Forgive my ignorance I thought LV meant Line Voltage , perhaps you can explain LV to me .
13 . You spent some time conversing with another guy with the same MC2100WAM like I have some time ago .
thank you
animal

 

There is a small fuse on the AC line from the LV (low voltage) out of the external transformer. The LV DC is a very simple circuit and should be very easy to trace,.
You require the AC at the anode side of the two large rect. diodes, seen at the HD2 end of the board.
If you trace the Input from HD2 pin 4 to the Opto input, the resistor usually fitted in series with this pin for the opto LED is only 22Ω, which is not sufficient.
Show a pic of the Pic PWM board?
The Pic boards I have made up, have the series resistor on them.

 

I do not know why the link for the generator did not come through . The pic board I bought started to not start all the time , half the time I have to push the stop button & then push start again to get it to start the motor , this is on another machine , I bought that one from another guy on one of the forums .
Lets try the link again .https://www.amazon.com/dp/B07NJ1SL3N?psc=1&ref=ppx_yo2ov_dt_b_product_details . I will try to get some time tomorrow to look at that part of the circuit . I turn wrenches . I'm not a electronics guy so some of this is new ground for me .
thanks
animal