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Optical Attenuator teardown Repair

Pete sets out to fix a recently acquired Photodyne 1975XQ optical attenuator to add to his lab. But it is not to be, an unobtanium missing EPROM makes life difficult. But the video still shows the teardown and quite a lot of details about the circuit as Pete checks which parts are, and are not working. He deides to use the optical assembly as the basis of a future project. Contents: 00:00 - Introduction and Ominous label 00:53 - Take it apart 01:06 - Optical Attenuator implementation 07:50 - Power Supply Recap and testing 11:38 - First Power On - Oh Dear! 12:04 - Internal board Overview 14:40 - Processor Board in Detail 16:06 - Why is there a DAC and OPAMPS? 18:17 - Is the missing EPROM an option or essential? 20:17 - Motor Driver Board 21:18 - Display Board Diagnostics 24:38 - Keypad logic 26:18 - Reviewing the faults 26:41 - A Plan is hatched A MOD 27:55 - How does a linear graduate make logrithmic attenuator 28:18 - Final throughts and wrap-up Help me keep the channel going: 🔸Topcashback https://www.topcashback.co.uk/ref/psh... offers cashback from Farnell, RS Onlline, Rapid and plenty more too. Please make sure you sign up using the link here to get your sign-up bonus! 🔸Octopus Energy £50 for new customers http://share.octopus.energy/sunny-ape... 🔸Donations always welcome! https://www.paypal.com/paypalme/Peter... As always please help by subscribing and liking videos. 🔸    / @makeorrepair   🔸 Follow me on twitter for the latest updates   / petershersby   🔸 I'm on Odysee too: https://odysee.com/$/invite/@MOR:9