Hi,
I have a Reebok RT1000 (RETL1600.1) treadmill,
it was given to me faulty & I enjoy tinkering so am trying to fix it to use myself....
when i turn it on, the console beeps ready. everything visually seems fine.
then i push up on the digital speed control, the motor starts but there is some arc'ing from the bushes & a very large thumping sound coming from the choke transformer.
the faster the motor spins the less frequent the thump, i did notice the thump happens each time the SCR TRIG led (location LD3) illuminates.
I have the model with a power board (Euro 101 P/N 133275, Icon 1996. BF-P079010-000 Vendor# 1506) & seperate Motor control board (Icon MC-66 1000w).
A bit of history on the unit & what i've tried so far....
The treadmill came with faults which included uncalibrated speed (if & when it worked) motor sometimes came on when told, sometimes came on at power up & span regardless of console input, sometimes the console wouldn't illuminate / no readouts.
So far i have read thoroughly the other posts on this forum regarding MC-60 repairs & a good google search, I checked against treadmill doctors troubleshooting & found a manual and hand written circuit diagram of the mc-60 (similar model)
Following other people's experiences, I have replaced the 3x D8020L transistors (location D9, D? & D13) & 2x S8020L transistors (location Q6 & Q7) on the motor control board, although 12v LED (location LD1) wouldn't light, so i have replaced that & it now works. I also found the zener diode (location D11) was faulty so have now replaced that (after replacing the transistors) The two rubicon capacitors 250v 470uF I replaced too.
I also replaced a fried diode on the power board (location D7) and the PWM led (location LD2)_and the Tach led (location LD4) which now both work properly.
The 9vdc led used to work, but i forgot it didn't have a built in resistor, when i tested it for polarity, it blew. i have replaced it, but the led still won't illuminate, even with a new one. I have checked it isn't in the wrong way around....
When i ran the treadmill when i first got it, there was no arc'ing inside the motor, nor was there any thumping sound, I tried gently filing down the bushes to ensure good connection, although this didn't make any difference. I wonder if it is either mis-matched components or something i've upset? To make things easier I have everything on a test bench at the moment and there is a good earth connection between all the components..
could it be a fried transistor from running it with a knackered zener diode? I have replaced them, but didn't spot the diode before trying it... Could it be a fault of the 12v LED not being illuminated?
I couldn't identify the value of the zener diode on the motor control board at location D11, so my local electronics dealer gave me what he thought was a good replacement, likewise for the diode at location D7 on the power board.
I have a replacement opto isolating transistor, but couldn't find an exact match, the one the electronics dealer gave me didn't work when i tried it
so now i'm stuck! anyone any ideas on what could be causing the transformer thump noise? or the arc'ing in the motor? or the 12v led not to work, even when it's replaced for a known good one?
Please see photo's - thanks
Thanks
josh1e
I have a Reebok RT1000 (RETL1600.1) treadmill,
it was given to me faulty & I enjoy tinkering so am trying to fix it to use myself....
when i turn it on, the console beeps ready. everything visually seems fine.
then i push up on the digital speed control, the motor starts but there is some arc'ing from the bushes & a very large thumping sound coming from the choke transformer.
the faster the motor spins the less frequent the thump, i did notice the thump happens each time the SCR TRIG led (location LD3) illuminates.
I have the model with a power board (Euro 101 P/N 133275, Icon 1996. BF-P079010-000 Vendor# 1506) & seperate Motor control board (Icon MC-66 1000w).
A bit of history on the unit & what i've tried so far....
The treadmill came with faults which included uncalibrated speed (if & when it worked) motor sometimes came on when told, sometimes came on at power up & span regardless of console input, sometimes the console wouldn't illuminate / no readouts.
So far i have read thoroughly the other posts on this forum regarding MC-60 repairs & a good google search, I checked against treadmill doctors troubleshooting & found a manual and hand written circuit diagram of the mc-60 (similar model)
Following other people's experiences, I have replaced the 3x D8020L transistors (location D9, D? & D13) & 2x S8020L transistors (location Q6 & Q7) on the motor control board, although 12v LED (location LD1) wouldn't light, so i have replaced that & it now works. I also found the zener diode (location D11) was faulty so have now replaced that (after replacing the transistors) The two rubicon capacitors 250v 470uF I replaced too.
I also replaced a fried diode on the power board (location D7) and the PWM led (location LD2)_and the Tach led (location LD4) which now both work properly.
The 9vdc led used to work, but i forgot it didn't have a built in resistor, when i tested it for polarity, it blew. i have replaced it, but the led still won't illuminate, even with a new one. I have checked it isn't in the wrong way around....
When i ran the treadmill when i first got it, there was no arc'ing inside the motor, nor was there any thumping sound, I tried gently filing down the bushes to ensure good connection, although this didn't make any difference. I wonder if it is either mis-matched components or something i've upset? To make things easier I have everything on a test bench at the moment and there is a good earth connection between all the components..
could it be a fried transistor from running it with a knackered zener diode? I have replaced them, but didn't spot the diode before trying it... Could it be a fault of the 12v LED not being illuminated?
I couldn't identify the value of the zener diode on the motor control board at location D11, so my local electronics dealer gave me what he thought was a good replacement, likewise for the diode at location D7 on the power board.
I have a replacement opto isolating transistor, but couldn't find an exact match, the one the electronics dealer gave me didn't work when i tried it
so now i'm stuck! anyone any ideas on what could be causing the transformer thump noise? or the arc'ing in the motor? or the 12v led not to work, even when it's replaced for a known good one?
Please see photo's - thanks
Thanks
josh1e
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