jonnybgood
Full Member level 4
Teleflex tacho repair
A tachometer on my boat got fried when I was cruising. I saw two 'blow ups' one after the other and I observed smoke.
Attached are some photos of the schematic. I tried to look for the schematic but it was in vain.
I managed to get the values of the two capacitors; 015J400 and 47uF polarised. However the power resistor was totally burned I couldn't recover the value.
when I desoldered the fried resistor I read 227.6 Ohms, but when I removed the terminal caps from the resistor to end up with only the 'graphite bar' I read about 700 Ohms.
I thought 227 Ohms is the closest to 220 Ohms standard values. The black diode was still oki when tested. I am not sure if the zener diode near the 'black area' is still working or if it still has the
value on the other side.
Do you think that this short was caused due to the dry capacitor or it could be a fault in the alternator? should there be a fuse in between to check it as well?
A tachometer on my boat got fried when I was cruising. I saw two 'blow ups' one after the other and I observed smoke.
Attached are some photos of the schematic. I tried to look for the schematic but it was in vain.
I managed to get the values of the two capacitors; 015J400 and 47uF polarised. However the power resistor was totally burned I couldn't recover the value.
when I desoldered the fried resistor I read 227.6 Ohms, but when I removed the terminal caps from the resistor to end up with only the 'graphite bar' I read about 700 Ohms.
I thought 227 Ohms is the closest to 220 Ohms standard values. The black diode was still oki when tested. I am not sure if the zener diode near the 'black area' is still working or if it still has the
value on the other side.
Do you think that this short was caused due to the dry capacitor or it could be a fault in the alternator? should there be a fuse in between to check it as well?
