# Ensoniq SD-1 Audio on AUX but not Main or Headphone

**URL:** <https://forums.syntaur.com/t/ensoniq-sd-1-audio-on-aux-but-not-main-or-headphone/6107>\
**Category:** Synth Repair\
**Created:** [August 22, 2023, 11:42pm UTC](https://forums.syntaur.com/t/ensoniq-sd-1-audio-on-aux-but-not-main-or-headphone/6107 "2023-08-22T23:42:19Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Rob2](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/r/f9ae1b/32.png) [@Rob2](https://forums.syntaur.com/u/Rob2)\
**Post date:** [August 28, 2023, 2:53pm UTC](https://forums.syntaur.com/t/ensoniq-sd-1-audio-on-aux-but-not-main-or-headphone/6107/3 "2023-08-28T14:53:27Z")

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Right after ordering the 74LS174, I noticed a very small deformation under high magnification on a trace near FB12, which connects U29 pin 8 to ESP (U21) input on pin 1. The first photo is after I removed the defective area from the trace and exposed some copper to run a jumper wire as see in the second photo. This corrected the main issue with the outputs and I was able to repair all other minor issues with the SD-1. Lesson learned here (once again) is to inspect **EVERY** trace in the circuit for even the smallest deformation before assuming there is a failed component. Before I removed and cleaned the problem area, it was only the size of a pen dot and a darker green than the trace around it. I confirmed no continuity with my DMM before digging into the trace to repair it. I’m so glad I didn’t have to go through the trouble of replacing any chips! Whew! 😅

 ![FB12_1](https://forums.syntaur.com/uploads/default/original/2X/7/708c85b475db104be800424b4bd49f3495e5d1eb.jpeg)  
 ![FB12_2.PNG](https://forums.syntaur.com/uploads/default/original/2X/7/7c3478a3514737ba5aef9b84fd04fa1475c4cd50.jpeg)

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