[Direct] New board is in!

That was a really quick turnaround! Here’s the new switchboard.

 

I build it up with the switches, diodes, resistors and new extra long header pins.

 

 

A test fit to the front panel showed that it was nearly perfect. Only the lower row could use a nudge (less than 1 mm) up and the upper right red switch was off by a mm as well. Everything else was perfect, including the display units.

I’m crazy impressed with Paul’s work.

This weekend I will do a comparative continuity test of the old and new board, but I don’t expect any differences.

 

Other things cooking:  I’m rebuilding the power supply. It had a broken voltage regulator. While it isn’t anything exotic, the way it was build was a bit interesting.

There are 2 separate 5v regulators of different types. Then there is a 5v lead coming from one of the rectifiers. And finally there is a +12.

They were soldered to pins on the main board, I will replace that with a proper connector. Also, eventually, I want to move everything to a proper power supply PCB. Right now it’s just a soldered chain of components.

 

Bunch of parts were delivered:

– Additional resistors I need for restoration

– Tons of fresh tantalums to replace a few of the more delicate ones

– An EDAC male connector, for the midi breakout box (a seperate one for the audio ports will come later)

On order:

– Tons of m3 screws and stuff in various sizes.

– specific diodes

I’m preparing a few EPROMS. The first one contains simple boot initialization code for the Motorola CPU and the Duarts and will sound a 3 x 3 beep.

Then there will be a more extensive diagnostics EPROM – more on that soon.

 

 

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