Digitech/DOD PDS 1700 Chorus/Flanger **Power wiring help!**

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fearofmusic
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Posts: 3
Joined: 10 Sep 2023, 20:59
my favorite amplifier: JC 120
Location: Raleigh, NC

Post by fearofmusic »

I've made a huge mistake.

I wanted to be able to use the power plug instead of the battery, but the power jack wasn't working. These have a plug style that looks like a headphone plug. I opened it up, made some very minor changes to the power wiring and now that power jack works.

Fast forward a few months and one day my PDS 1700 makes no sound. I try battery power, and plug power, and I desperately try and remember exactly what I changed with the wiring. I don't remember what I did. I have searched the internet for a clear picture of the insides that shows the wiring from the battery and from each of the jacks up to the board. I'm not even sure if the molex-style plugs are oriented correctly at this point. I even desoldered the power plug jack in the hope that if I just try to get it wired back to battery power at least it might work.

I've been assuming this whole time that the wiring must be the issue since that's the only thing that I futzed with. If it is an issue with one of the ICs I barely even know where to start troubleshooting that. I'm attaching some pictures, suitable for framing, of my girl in her current state. If anyone has one of these they can post a clear shot of the wiring from that would be yeet deluxe. Obviously, any insight is very welcome here. This is a choice pedal and one of my favorites, the fact that it just stopped working one day has distressed me greatly.

I need to flange again.

Thank you, and you look nice today.

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fearofmusic
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Posts: 3
Joined: 10 Sep 2023, 20:59
my favorite amplifier: JC 120
Location: Raleigh, NC

Post by fearofmusic »

I'd like to add that I understand this is something I could likely figure out from reading the schematic. I don't know how to read schematics. That's why I'm asking if anybody can tell me which wire is supposed to go where like a goob. I haven't even been able to find a schematic, either.

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fearofmusic
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Joined: 10 Sep 2023, 20:59
my favorite amplifier: JC 120
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Post by fearofmusic »

I know you guys are on the edge of your seats waiting for an update. I built myself an audio probe, and I intend to use it. Not right this second I’m busy typing but soon. You Gotta be crazy if you don’t think I’m gonna post a result of what I find here. Anyway I want to thank everybody for your continued support and donations. You look nice today.

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GorillaHuman
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Post by GorillaHuman »

Usually the red battery wire goes to one of the poles (I think its the middle one) of the 9 volt jack. The 9 volt jack is tip-positive, so the barrel is the ground, that connection seems to be missing. Then, you seem to be missing a connection from the 9 volt jack (the lug that connects to the tip) that brings the 9 volt towards the circuit board.
That means in stead of building an audio probe, get your digital multi-meter and start measuring which color of the wire is connected to the ground, and which one is connected to the 9 volt line in your circuit board. You do that by using the continuity setting. A beep (or 0 ohm) would indicate you found the right wire to connect back to the 9 volt plug.

Note that the plug for the 9 volt is connecting ( I think) the 2nd and 3rd pin together when there is nothing inserted. If you insert a 3.5mm plug, only one pin will be active. That is the one you need to connect your 9 volt line towards the PCB to. The other one goes to the 9 volt battery. Else you would be powering your 9 volt battery instead of the PCB :-)
Final tip. Write it all down and solve it until you have no more loose wires left.
Good luck.

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trs
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my favorite amplifier: mr. microphone
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Post by trs »

See page two of the attached document.

PDS_1700.pdf
Digitech PDS 1700 Schematic, Layout, and Off-Board Wiring
(470.63 KiB) Downloaded 75 times
Delighted to see a PDS thread in 2023, these are underappreciated gems

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