Route 66 Help!

[blustrat]

Hello, i need help please! One resistor in my visual sound route 66 is fried! It looks like an hotdog now! It stays between the DC positive pole and a 100uf cap. I have tried to replace it with some others res starting from 1k but it still  doesn't works. The OD effect doesn't work at all, with the compressor on the pedal squeal. The pcb under the fried res was literally burned. Should i replace the cap near the burned res? It looks ok...Can the IC be damaged?
Apologies for my bad English, i hope someone can help me, bye.

[MartyMart]

If it's between the +9v in and the + side of the cap then it's probably 100 Ohms to 220 Ohms
It could also have been a "reverse polarity protection" diode .... possibly a 9v1 zener or a regular
1N4148  !!
More details needed, perhaps RG will chime in with the answer, it's one or other of the above for
sure.

MM.

[R.G.]

If it's between the +9V in and the 100uF cap, it's a low ohmage resistor. The actual value varies somewhat with the date of manufacture, but I think 47 ohms to 100 ohms will work.

That kind of damage on that resistor indicates some serious abuse with either a reverse polarity diode or an AC 9V power supply. A 9V power supply connected the wrong way around  would put about 90ma through the resistor, and about 0.81W in it. An AC supply would first burn out the resistor, then the protective diode, then the 100uF cap, then the rest of the polarized parts on the board.

Put a resistor in there between 47 and 100 ohms. If it works after that, you're lucky and it didn't take out the rest of the circuitry on the board.

[blustrat]

Thx for the answers Marty And Mr.Keen  .
3 of the 5 IC's (2 x TL072 and 1 x 4558) work on my SD1, so they aren't damaged. I replace the 100uf electrolitic but the pedal still doesn't work. Today i will try with a 47 ohm res replacing the protection diode also.

[blustrat]

Ok...100ohm res and D4 replaced with a 1N4007, the pedal worked just for few seconds. I am using a battery not an adapter. What could be happened?

[blustrat]

I notice this: the pedal works for few seconds then the sound start to fade out. Electrolitic 10uf cap in C17 seems to be damaged so i replaced it. Should i try to replace all the polarized caps?

[blustrat]

Ok..fixed! All electrolitics were replaced. Thanks Mr. Keen for the useful help, thank you too Marty.
Greetings from Italy