Differences

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--- projects:dslam [2024/04/05 11:20] – q3k
+++ projects:dslam [2024/04/05 12:22] (current) – [FXS] q3k
@@ Line 30: / Line 30: @@
 === PSU Recap ===
-The caps on the PSU (APSI-605AC Rev.C) are bad. Here's the values jotted down so that q3k can order some new ones:
+The output smoothing caps on the PSU (APSI-605AC Rev.C) are bad. Here's the values jotted down so that q3k can order some new ones:
-  * C9: 470uF 63V
+^ Refdes ^ Capacitance ^ Voltage ^ Diameter ^ Height ^ Lead spacing ^ Replacement ^
-  * C10: 470uF 63V
+| C9, C10, C14 | 470uF | 63V | 16mm | 20mm | 7.5mm | EEU-FS1K471S |
-  * C14: 470uF 63V
+| C15, C17, | 220uF | 100V | 16mm | 25mm | 7.5mm | UHE2A221MHD6TN |
-  * C15: 220uF 100V
+| C19, C20, C22 | 1200uF | 10V | 10mm | 20mm | 5mm | EEU-FS1E122B |
-  * C17: 220uF 100V
-uF/63V caps are 20mm tall, 16 mm diameter, 7mm leg pitch. 220uF/100V caps are 25mm tall, 16mm diameter, 7mm leg pitch. The board came with Nichicon branded caps. C19 is visible bulged. C10 is burst. The rest look fine, but should be replaced regardless.
+C19 is bulged. C10 is burst. The rest look fine (after desoldering, no, the bottom plugs are also slightly pushed out on some of the others - good call to replace them regardless), but should be replaced regardless.
-There's other, lower voltage caps that look fine that we'll probably leave be for now.
+There's also a primary side 100uF/400V cap (C13) that has been measured to be ~97uF, which is good enough so is left alone for now.
+=== JTAG Pinout ===
+Refdes J8 'JTAG'.
+^ Function ^ Pin ^ Pin ^ Function ^
+|    Diode |   1 |   2 | Diode    |
+|    Diode |   3 |   4 | GND      |
+|     3v3? |   5 |   6 | GND      |
+|     Hi-Z |   7 |   8 | GND      |
+|     Hi-Z |   9 |  10 | GND      |
+|    Diode |  11 |  12 | GND      |
+|     Hi-Z |  13 |  14 | Hi-Z     |
+|     Hi-Z |  15 |  16 | Diode    |
+|     Hi-Z |  17 |  18 | Hi-Z     |
+|     Hi-Z |  19 |  20 | Hi-Z     |
+Diode means a diode was detected (0.3V-1.6V) from that pin to ground. Hi-z means there didn't seem to be a diode between that pin to ground. This looks like a custom JTAG connector, q3k will attempt to discover the pinout once the PSU is fixed.
+There's also a BDM connector on board.