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Démarré par perjmolsen, Mardi 03 Janvier 2017, 13:45:38 PM
Citation de: Vieille_Loutre le Mardi 03 Janvier 2017, 19:40:06 PMHi,don't give up, gc339 has done a fantastic work, thanks to him i was able to repair my pcb.if i can give you a advice, don't forget to replace your olds 78L15 and 78L05. These little bastards are voltage regulators and i think they were the cause of massive damage on my board... good luck !
Citation de: gc339 le Mercredi 04 Janvier 2017, 00:00:53 AMHi.Why do you need to replace R24 ?Is it cut or burned ?
Citation de: gc339 le Mercredi 04 Janvier 2017, 18:15:05 PMAccording to the body color of this resistor, I think like Fred G5 that it must be a flame-proof resistor.Although it's better, but it's not an absolute necessity to replace it with a resistor of the same type.An ordinary resistor, power 2 or 3 watts, should be suitable. You can also try a wire-wound resistor, power 5 ou 7 watts.If this resistor is cut, it must have acted as a fuse and transistor Q1 is probably short-circuited. Check it and pay attention to L2, some windings of its coils could also be short-circuited.PS : Data about the windings of L2 are written on this draft : http://www.gamoover.net/Forums/index.php?topic=28406.msg453306#msg453306
Citation de: perjmolsen le Jeudi 05 Janvier 2017, 12:01:01 PMThe resistors at location:R81 and R63 seems to be a 22 ohms 5% (Red-Red-Black-Gold)in my defective PSUMy working PSU that i have 55 ohms 5%(Green-Green-Black- Gold)
Citation de: perjmolsen le Jeudi 05 Janvier 2017, 12:01:01 PMMy working PSU that i have 55 ohms 5%(Green-Green-Black- Gold)So what type of resistor is correct? I have searched for a 55ohms resistors online but only able to find 56 ohms resistors at ebay.
Citation de: perjmolsen le Jeudi 05 Janvier 2017, 12:01:01 PMA last question - when replacing resistors, does it matter if it a four or five band resistor? As log as the ohms is the same - then the tolerance is smaller at five band.
Citation de: gc339 le Jeudi 05 Janvier 2017, 15:17:25 PMAre you sure R63 is the right reference ? Is not it rather R69 ?The value of these resistors depends on the release of the motor driver board, this is 22 Ω for the reference 400-5117 (not suffixed) and 56 Ω for the 200-5117Y ("Y" suffixed). Take a look at the first tab of this chart (OpenOffice Calc File) : http://www.gamoover.net/gc339/SEGA/Nomenclature.odsA 5% tolerance implies that this resistor may not have a value other than one of the E24 series, so 56 is the right value.The second green ring is probably due to a momentary lack of blue paint during manufacturing. Have you measured the value of these resistors?You case use resistors with a better tolerance than 5%. Some values of the E48 or E96 series do not exactly fit those of the E24 series so it's necessary to choose the nearest value or at least one within the ± 5% range.