Power Supply Rebuild: converting the wiring harness for 240v rather than 110v

I forgot to document the key part of the conversion process of taking a US Williams machine and converting it from 110V to 240V is that a jumper wire in the wiring harness needs to be moved and another removed to supply difference voltages to the transformer.

Below is the default US wiring of the ‘block’ that connects to the transformer from the wiring harness and shows the two white/red jumper wires that need to be moved in position.

Before: (2 – 6 and 4 – 5)

After: (2 – 5)

and to remove the pins easily from the block connectors you need a pin extractor tool.

Initially I bought this basic one from Radio Shack which was fine, but a bit fiddly, so I bought the more expensive complete set from a company in Hong Kong via eBay which are excellent.

Basic Pin Extractor:

Excellent Pin Extractor Set:

Numbering convention of the block when you look at it from the back is:

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| 3 | 2 | 1 |
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| 6 | 5 | 4 |
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| 9 | 8 | 7 |
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| 12| 11| 10|
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so you need to change

-------------
| 3 |(A)| 1 |
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|(A)|(B)|(B)|
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| 9 | 8 | 7 |
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| 12| 11| 10|
-------------

to be

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| 3 |(A)| 1 |
-------------
| 6 |(A)| 4 |
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| 9 | 8 | 7 |
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| 12| 11| 10|
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