MaxHeadRoom
- Joined Jul 18, 2013
- 28,619
The value of R45 on the photo above looks like 200Ω.
Couldn't see R46.
Are you sure they are IGBT and not Mosfet?
Max.
Couldn't see R46.
Are you sure they are IGBT and not Mosfet?
Max.
Hi, Ross. If the motor does not work, check the IGBT and the power diode just to the left. You could tell me the numbering of resistors R45 and R46.Examining my MC2100E, I find U1, an optocoupler, has a blown diode. I used a DMM, on the diode test scale, so I hope that was correct. U2 showed continuity between 1 & 2, where U1 did not. reversal was nothing for both. I guess that might not be the only fault, as there are clear liquid stains on the board. I can't get an F817, but a 50mA/3.7KV unit is available locally at Farnell [Element 14]. A Toshiba TLP290. It has a 50% transfer ratio. Would explain why display works normally but motor doesn't drive. Be very good if I can get treadmill working, seeing it was free. I will check the limiting resistor to make sure the replacement is safe. NB A steel mounting tab for the heatsink plate was bent up near the 3rd rectifier terminal. There's no evidence of shorting, but I bent it down to be sure. Tks all for the blog.
Hi There, Did you mean you have the MC2100 board? You will also have 220v grid voltage there and may find a good replacement in the UK. Good Luck!If this is not possible, I'm ready to buy a work card. The only problem is that I am from Ukraine.
Hi There, In most Icon units there is a feedback reed switch on the front roller that watches rotational speeds and feeds this back to the upper console to match speed settings selected. The parts that are burnt on the pics shown are in the FET Drive circuits and signals at R24 feeding the predriver would be 15v or less at maybe 20khz or so. The feedback connector is a two-pin cable, this signal will go into the PIC chip(programmed processor) and come out then thru an opto and up to the console. Feedback signals to the processor will be 0-5v. Signals to/from the console are also TTL levels. Good Luck!I'm sorry, I have MC2100. I correctly understood that the speed feedback is taken from the account of the engine? What are diagrams of voltage must be at R23, R25? Not the first time the tracks with such a board burn, can they put protective diodes on the processor input?
Speed feedback is picked up with external sensors, but from brushes. The PIC chip is the main lower board processor, receives speed commands from the upper board, send speed feedback to the upper board, supplies switching timing and duty-cycle commands to the main switching FET, monitors Vcc for logic. The picture shows a small predriver chip used to interface the PIC to the main switch. If the 100-ohm resistor opens between the predriver and the PIC you can assume the PIC has taken a hit as well.Those. My assumption about the fact that the speed feedback is removed directly from the brushes - is wrong? I thought that PIC was watching the reverse EMF motor.
Thank you! I can not find the datasheet on mic4227, are there analogs of this microchip?This is the reverse-engineered copy of the MC2100, not sure if it will help.
Max.
by Aaron Carman
by Jake Hertz
by Jake Hertz
by Jake Hertz