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Search: Posts Made By: R_J
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-24-2018, 10:23 AM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

Ok, so the voltage on U2 pin 7 does it also vary? Pin 7 connects to R27 which then connects to Q2. Check U1 pin 12, What is the voltage here and does it vary with the speed control?
Can you provide...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-23-2018, 08:19 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

Ok, so the voltage does't vary with the control it just stays at 10v.
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-22-2018, 07:29 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

You can only measure pins 1 & 2 with reference to LG3 ground, pin 3 is not used,
pins 4 connects to D5 cathode, so I suspect it would measure 160vdc. pin 6 connects to the scr gates, pin 5 is...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-22-2018, 10:10 AM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

LG5 is not chassis ground. LG5 is 120 volt A/C input. The only ground point to check voltages on points like ld2, u1 u2 etc. is LG3, this is ground.
The way to check this circuit is with a...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-21-2018, 08:00 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

You lost me, I don't see LR1 or LR2.
LD2 test point is what turns on the led inside of U3, but like I said it is likely a pulse but there should be some dc on it I would think (or try measuring a/c...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-21-2018, 01:09 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

When you vary the control I suspect that pin 1 and pin 7 of U2 also change.
There is a point marked LD2 (SCR Trig) is there any voltage on that point? and does it vary with the control? This may or...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-21-2018, 09:19 AM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

The speed control should vary the voltage on LG2 from 0 - 5 volts, If it is connected to pin 3 of U2 I would expect more than 0 volts on that pin. You need to check the resistance between LG2 and pin...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-20-2018, 08:56 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

I would think the ic is bad, I can't trace where LG2 goes but it must connect to one of the ic input pins, It seems to go under the ic?
check which input pin it goes to, the speed control should...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-20-2018, 05:22 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

You are not using ground to measure the voltages, Use LG3 for your ground or pin 11 of the ic

What point are you using for ground anyway? here is the pdf of the ic
R33 might be open
Check that...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-20-2018, 10:54 AM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

When I look at the ic I see these marks, If the ic got hot due to being shorted internally it can discolor the top.
Does the ic get hot? you could post the voltages of that ic's pins, That may or...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-19-2018, 10:34 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

That could be it budm, but the diagram would suggest if the key was not there he would not have 120v a/c across LG4 & LG5.
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-19-2018, 08:29 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

What voltage do you have between LG3 and LG2, it should vary between 0 and 5 volts when the speed control is turned.
Also check the reed switch wire, that may need to be connected, it receives...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-19-2018, 02:20 PM
Replies: 36
Views: 1,017
Posted By R_J
Re: Treadmill DC Circuit no motor start

I would guess the first time you hooked it up on the bench you had a a couple wires mixed up. A close look at U2 looks like it got hot. the `2' in the KA324A looks discolored ands so does the last...
Showing results 1 to 13 of 13

 
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