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Re: Guitar pedal wiring
If you only replaced the jacks, then check where you soldered your wires. The ground wire from the circuit board an/or switch will be wired to the sleeve of the jack. The tip of the jack would be wired to the output lug of the switch. Also check the wiring on your in jack to make sure the correct wire is going directly to the switch from the jack's tip. The ground wire will go from the sleeve to the circuit board and/or ground lug on the switch.
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Inspect the jack for damage... including solder where it attaches to the circuit board. Common problem when someone trips over a guitar cable. Loop the cable through the handle of the amp to REDUCE the chance of this failure.
This sounds like either a bad guitar cable or a bad jack in the guitar. Possibly your friend is not as qualified to find these intermittent problems as needed? These jacks are really junky and often have riveting of the barrel come undone... especially if the retaining nut is overtightened. The LONG barrel like jacks are notorious for failing. You have all the information you need to solve this problem. First try a different guitar cable... (often they are broken or intermittent at the end where they flex). If that doesn't fix it, replace the jack in the guitar. Also verify that the conductive coating paint within the guitar is grounded. Sometimes the contact to it is destroyed when the volume control shafts or jacks become loose and they depend upon the shaft barrel to ground the paint.
I'm a Zoom 9000 owner (since '93, I think) Did you try batteries only? Are you plugging the guitar into the "in / power" jack and not mistakenly using another jack? When you plug in the guitar, in to the Zoom 9000 does the window come on with the settings shown? Sorry, I know some of these are obvious but always the chance of us being human. If all that seems fine, then I would read though a manual to see if maybe it is a setting problem, i.e., sound somehow got inadvertently turned off. If you don't have one, an internet search will lead you to one. Sorry, wish I knew more.
Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.
I take it you have made sure that both the cable to the distortion box from the guitar and the cable to the amp are both good. From the description you give, it sounds like there is no signal getting to the pedal. If the cable is good, then the next likely suspect would be the input jack on the fuzz box. Try wiggling it a little with the guitar cable in place to see if it is loose. Some input jacks are unbelievably cheap and flimsy. A crackling sound (static like) is almost always a bad connection. If it was the output jack, I would think that the guitar signal would come through a least a little bit, but you might want to try wiggling that one, too, if the input jack isn't the culprit.
Another possibility to check is the battery, but this doesn't seem as likely. Some effects units devour batteries, especially units that use 9V batteries. I have a multi effect pedal that kills a 9V in about an hour.