diff --git a/content/posts/2018-06-20-Reverse-Engineer-a-Saike-858D.md b/content/posts/2018-06-20-Reverse-Engineer-a-Saike-858D.md index 06aa69b..e27b8cc 100644 --- a/content/posts/2018-06-20-Reverse-Engineer-a-Saike-858D.md +++ b/content/posts/2018-06-20-Reverse-Engineer-a-Saike-858D.md @@ -30,7 +30,7 @@ room for improvement. That is what I am trying to do here. This first post will not cover everything so here is a Table of Contents where I can link the next posts: * Mission Statement and Teardown (This) -* Reverse Engineering (WIP) +* [Reverse Engineering]({{}}) * ... ## Problems diff --git a/content/posts/2018-06-21-Saike-858D-Original-Schematic.md b/content/posts/2018-06-21-Saike-858D-Original-Schematic.md new file mode 100644 index 0000000..e9c09ea --- /dev/null +++ b/content/posts/2018-06-21-Saike-858D-Original-Schematic.md @@ -0,0 +1,59 @@ +--- +title: "Saike 858D Rework Station - Original Schematic" +date: 2018-06-22T14:50:00+02:00 +author: eNBeWe +type: post +categories: + - Allgemein + - Bastelkram +tags: + - 858D + - DIY + - Arduino +--- +Recently, [I posted the teardown]({{}}) of my Saike 858D SMD rework station. +Now it is time to really reverse engineer the main PCB. +Some of the parts are similar to other "flavors" of the 858D, but some seem to be different. + + +## Approach + +My process of reverse engineering can be seen in the following picture (click for large version). + +[![Saike 858D Reverse Engineered](/posts/images/858D/Reverse-Engineering.jpg)](/posts/images/858D/Reverse-Engineering-big.jpg) + +I started with a picture of the copper side of the PCB which I flipped horizontally, +so this view is kind of an "X-Ray" view through the front side of the PCB. + +Then I started with marking most of the copper traces in different colors. +Most of the colors are just randomly chosen, but the yellow area is the +5V VCC line and the 0V areas are marked blue. + +Afterwards I added all the components on a second layer. Due to the mirrored back side graphics, +I can match the position to the image of the front side of the PCB and still read parts numbers. + +Lastly, I added all part references and as much part information as possible, i.e. part names, pin names, etc. +I took the values from resistors from their marking visible on the images. However I am not entirely sure +that all values are correct, because at some places I have the nagging feeling that the values are not matching my expectations. + +## Schematics + +I rebuilt the schematics of the PCB in KiCad. Here is the complete schematic in all it's glory. + +[![Saike 858D Schematic](/posts/images/858D/858D_Schematic.png)](/posts/images/858D/858D_Schematic-big.png) + +Let's go through the parts one by one. + +### Mains connection and Heater driver + +[![Saike 858D Mains Heater](/posts/images/858D/858D_Schematic_Mains_Heater.png)](/posts/images/858D/858D_Schematic_Mains_Heater-big.png) + +The left part of the schematic is about as simple as possible. +The mains power is bridged over to the connector for the transformer. +The only notable part is a big suppression capacitor (0.1uF 275V) by Tenta. + +The right part of the schematic is the heater control circuit. +The microcontroller can control the NPN-transistor Q1 through the limiting resistor R4. +This pulls down the cathode potential and activates the optocoupler U2 which is a MOC3041. +The MOC3041 is a triac driver and that it does. It contains a zero-crossing detection +circuit and controls the triac U1, which in my device is a BTA16. + diff --git a/content/posts/images/858D/858D_Schematic-big.png b/content/posts/images/858D/858D_Schematic-big.png new file mode 100644 index 0000000..5c7aae5 Binary files /dev/null and b/content/posts/images/858D/858D_Schematic-big.png differ diff --git a/content/posts/images/858D/858D_Schematic.png b/content/posts/images/858D/858D_Schematic.png new file mode 100644 index 0000000..996fca5 Binary files /dev/null and b/content/posts/images/858D/858D_Schematic.png differ diff --git a/content/posts/images/858D/858D_Schematic.svg b/content/posts/images/858D/858D_Schematic.svg new file mode 100644 index 0000000..4c434f8 --- /dev/null +++ b/content/posts/images/858D/858D_Schematic.svg @@ -0,0 +1,25685 @@ + + + +SVG Picture created as 858D+ Reverse Engineering.svg date 2018/06/21 15:58:17 + Picture generated by Eeschema-SVG + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 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