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| Power Pack repair attempt but cant discover parts |
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| BurningTantalum:
OK, thanks for clarifying that. Lets take a moment to review what we now know: It looks as if your module is NOT an optical trigger type. This is good. If your drawn schematic is correct, then the circuit is the same as the CD2 units that I am familiar with. The info in the list shows that this module has the 'limp home' facility (I think it operates to limit RPM when the motor overheats, such as water pump blockage) This must be the function of the 'daughter' PCB, and because there is some kind of spark we can assume that it is not faulty. I think that there is an error on the list, that states the trigger coil output as "100 - 400V". This is obviously incorrect. This is the voltage from the charge coil. The open circuit voltage from this coil will be in the region of 5V or so. If connected to the unit it will be the volt drop across the gate to cathode of the SCR - less than 1V. I would suggest: Disconnect the 'kill' switch and /or the safety lanyard switch. These are notorious for being full of water and rust. It could be leaking away voltage from the capacitor. Can you measure the voltage on the capacitor, either with an oscilloscope or with a DVA when the motor is turning? If the voltage is low, then it could be the Triac. I am assuming that you are spinning the motor with the electric starter. Remove the plugs to make this easier on the battery, BUT don't forget to connect the plugs to the leads AND a ground wire to each plug body (thread) to a good connection on the motor casting. Note: Any spark plugs will do, from a car etc, as long as they work ! Then these can be kept for testing, and the correct plugs will be ready to reinstall for running. BT |
| Florek:
Today i win the war. Have 2 strong spark. After replacing scr. BIG thanks for everyone who was involved for helping me out |
| Florek:
according to this schematic this triak and varistor should cut the voltage if coil provide more than lets say 400V, but how? the varistor will blow off or what? |
| Florek:
hello again can someone know what is this broken piece? its have shape similar to rugby ball and blue strap |
| 4cx10000:
It looks like a SOD-64 package, a diode anyway, whether it is a rectifier or zener diode do not know. You will have to remove it in order to see if there is any identification. Here is a data sheet with a diode with same package: https://www.vishay.com/docs/86003/by228.pdf |
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