first mod...gone wrong

[Bradleymiles]

I decided I was going to experiment a little with my dd7, not so much mod, but i wanted to change a few things from the original configuration. here is a list of what I did
1. desoldered pots and removed from board, soldered some insulated leads between pots and board to relocate pots
2. swapped led for a 5mm high brightness led
3. replaced footswitch with metal, normally open soft touch momentary switch
4. replaced the jack for external tap tempo with another normally open soft touch momentary switch
5. desoldered the dc jack and replaced with a different one, also to relocate off the board

now I have a pedal that doesn't work. not sure what happened. I was very cautious while desoldering, etc. the led only comes on when my finger is touching the long side of the led. I have no idea what to do from here, any help would be great

[knutolai]

Hmm one way to go about it would be to reverse your steps and check if the circuit is operation correctly after each modification. Then its easier to find out where it all went wrong.
Are you sure you got all the component terminals correctly? when doing these kinds of modifications its good to note down what went where in the original circuit.

[vigilante397]

1. desoldered pots and removed from board, soldered some insulated leads between pots and board to relocate pots
2. swapped led for a 5mm high brightness led
3. replaced footswitch with metal, normally open soft touch momentary switch
4. replaced the jack for external tap tempo with another normally open soft touch momentary switch
5. desoldered the dc jack and replaced with a different one, also to relocate off the board

1. Shouldn't be a problem, one of the easiest parts of re-boxing a PCB pedal.
2. Shouldn't be a problem.
3. This might be a problem. I can understand the desire to have a momentary switch on a delay, as that would allow you to do some neat things with it, but replacing an ON-ON switch like a DPDT or 3PDT with a momentary would be a tricky mod. I'm not saying it's impossible, but there isn't a 1:1 correspondence with the connections like with pots.
4. I understand this one and it is a great idea to have everything in one unit without an external tap controller. This is less likely to be a problem, though I admit I don't know how Boss external switches are wired.
5. Shouldn't be a problem.

So if we were placing bets I would wager your switch substitution is your problem. I've never tried to put a momentary switch on a pedal that normally has a DPDT or 3PDT but I don't think it would be simple.

Do you have pictures? A before/after picture would be ideal, but I'd imagine you probably only have the after right now

[Bradleymiles]

How would you go about checking after each mod? Sorry, kinda new here. And I have noted what went where before I ever started working. Everything is exactly the way it was, or so it appears, but somewhere something isn't right

[vigilante397]

I was able to track down the service manual, which has the schematic and layout.

http://elektrotanya.com/boss_dd-7.pdf/download.html

I wish they were all that easy to find

[vigilante397]

After taking a look through the manual it looks like your tap switch in place of the extra jack wouldn't work. This is built to take the Roland EV-5 as an input, which is an expression pedal to control delay time, not a tap-tempo controller. I doubt that would prevent the pedal from turning on, but it is a problem.

[GGBB]

According to the owner's manual http://media.rolandus.com/manuals/DD-7_OM.pdf an FS-5U footswitch or an EV-5 expression can be used.  The FS-5U is a normally open momentary switch so that shouldn't be a problem.  What kind of DC jack are you using?  Is it mounted in a metal enclosure?

[Bradleymiles]

Okay thank you all. The pedal now works. It's noisy but some of that is due to not being in the enclosure yet. But it's working. The power jack I ordered is from small bear, plastic housing. Only thing now is the led doesn't work. I replaced the3mm led that was bi color green and red with a blue 5mm bright led. But it's not lighting up. Any suggestions there on that one?

[GGBB]

Okay thank you all. The pedal now works. It's noisy but some of that is due to not being in the enclosure yet. But it's working. The power jack I ordered is from small bear, plastic housing. Only thing now is the led doesn't work. I replaced the3mm led that was bi color green and red with a blue 5mm bright led. But it's not lighting up. Any suggestions there on that one?

The original LED is technically two LEDs in one with a common cathode and separate anodes, so replacing it with a single LED means one of the two originals is no longer present.  Since the original LED has three connections, you need to make sure that you use the right ones - specifically don't try to connect a single LED to the two anode connections.  There is a diagram of this in the lower left corner of page 18 of the service manual.

[Bradleymiles]

 thanks, ill look a little further into that. So i cut out the tap tempo jack, soldered in its place a momentary switch, doesn't work as it should, Pedal doesn't see the footswitch. also the original footswitch in the pedal to switch between buffered bypass or delay works, but when i replace it with a momentary metal switch, it doesn't work. are they not the same? its normally open..

[GGBB]

So i cut out the tap tempo jack, soldered in its place a momentary switch, doesn't work as it should, Pedal doesn't see the footswitch.

According to the schematic in the service manual (page 20 lower left), this is also a three conductor connection.  Make sure you do what needs to be done for all three.

also the original footswitch in the pedal to switch between buffered bypass or delay works, but when i replace it with a momentary metal switch, it doesn't work. are they not the same? its normally open..

Test whether it's a nc/no issue by seeing what happens when you hold it down to play and open it briefly to toggle bypass.