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SE/30 No sound after recap experience

360alaska

Well-known member
Hello all,

I wanted to share with you a recent experience regarding an SE/30 I had acquired. I recently bought it on here from "Kastegir" who had said in a previous post that it had weak sound. I recapped it only to discover that it's condition did not improve, it did sound strong coming out of the headphone jack so after checking the headphone jack electrically I suspected that the problem may lie somewhere in the vicinity of the of the OPAMP(UA9) or the push-pull amplifier(Q1/Q2). Before I was to troubleshoot this I had wanted to make an extension for logic board to analog board harness so I can easily take measurements from the logic board so I bought a spare on eBay and doubled its length. Anyways, to my surprise when I had connected the newly built extended cable I discovered that the sound did work! I connected the old cable and it didn't so it wasn't just a fluke... I pin checked the harness only to discover that the -12v wire (green) was disconnected... Just goes to show that when troubleshooting an issue like this always check the voltages first, the se/30 did work perfectly otherwise though...

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