Desoldering

Over a few Sunday afternoons I have been desoldering components from a few scrap pcbs from a number of items.

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This picture shows 2 of the boards for desoldering. The one still in its case is from a JVC CD players from sometime in the 90s. The other is from an add on system for a Hitachi digger. My Dad took it out of a digger we once had and it sat in the garage for years before I asked could I have it for desoldering.

IMG_1571 This is a controller board from a washing machine that me and my brothers dismantled. All 3 boards have lots of through hole components which I can reuse in my own projects.

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So I started out trying to desolder the components with this soldering iron and solder wick. I got some parts off the hitachi board, but it was very slow, so I got my younger brother to help me with the gas blowtorch. I clamped the board in the vice in the workshop and he heated from one side while I pulled parts off the other side with a pair of pliers. This worked well and we did that for the JVC CD player board. Then, another Sunday afternoon I tried to do the same on my own for the other 2 boards, but it didn’t go nearly as well and a lot of the parts were destroyed. One interesting thing about the JVC CD player was that the board with mains to it was connected to the transformer by wire wrap on 3 big pins.

Components pulled off the boards:

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7 segment displays from the Hitachi board

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Integrated circuits from all 3 boards (Quite a lot of standard logic off the hitachi board)

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Big and little transformers (Big one is off the JVC CD player)

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VFD from the CD player

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Relays, motor, connectors and CD drive mechanism

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Lots of capacitors (Including some trimmer capacitors)

Full details of the part numbers and values of each part to come in future posts

 

 

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Failed PS/2 adaptor

One day I was trying to install Raspberry Pi Desktop on an old PC and everything was going well. I had done the BIOS stuff to make it boot from the DVD drive, and when I put in the DVD I was greeted by a menu of installation options. Then when I went to select one or even hit enter, nothing happened. I put the keyboard into different ports and tried different keyboards but to no avail. Then I thought that maybe a PS/2 keyboard would do it. But I didn’t have one of those. So I left it for a few weeks. Then I thought that maybe I could make an adaptor using the lead of a PS/2 mouse in a pass-through setup. So I poked around with a multi-meter to find which lead does what, then soldered up my lovely adaptor. Which then did not work at all for one of a few reasons:

  • Bad soldering by me
  • Keyboards tried don’t support PS/2
  • Wrong connections

Probably the bad soldering by me though

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