422TTL modification for Bench DC Power
warrenjrose and one other contributor
Last updated on Dec 11, 2024
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Community-Contributed Guide
An awesome member of our community made this guide. It was not created by iFixit staff.
Introduction
Go to step 1 ↓The Advantech 422TTL is used to convert a TTL signal, into a differential 422 signal. However, when using the recommended power supply, the output on the RS-422 side is absolute garbage due to the cheap switching power supply injecting noise. We were converting PPS.
We fixed this by using a bench top 12VDC power supply for nice clean power. This guide will document that modification.
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Remove side sticker (DC Power 12VDC)
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Remove hardware (Screws and metal tabs)
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Carefully lift 4 tabs (2 per side) to split unit into two halves.
Ask FixBot
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Remove the PCB from housing, examining where the headphone style power adapter attaches.
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Desolder and remove the power adapter.
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Positive (red) and negative (black) power lines should attach where the socket was removed.
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To reassemble your device, follow these instructions in reverse order.
