One of the worlds first Pocket Digital Multimeters | 1977 Sinclair PDM35 | Can I Fix It?

I saw a Faulty Sinclair PDM35 Pocket digital multimeter on eBay, so I bought it to try and preserve what is one of the worlds first pocket digital multimeters. It was made around 1977 and sold for £34.50 at launch. Let's take it apart, see if we can diagnose the problem and hopefully repair it! I'm not an expert, but I do enjoy trying to fix things. If you enjoyed this video, or found it useful or helpful, please consider subscribing. It's free and you'll be notified when I upload more videos. Thank you for your support! Some of the tools and equipment that I use: Kaiweets KTI-W02 Thermal Camera: 15% off code: BIFI15 (15% off code Available site wide at Kaiweets.com and it never expires.) https://kaiweets.com/products/kti-w02... or alternatively on Amazon UK: 15% off code: GQ7SHK42 Date of expiry: 2024-10-31 https://amzn.to/3WAuuwc Other Kaiweets thermal cameras: https://kaiweets.com/collections/ther... TOMLOV 4K AF Microscope: TM4K-AF Flex: 8" screen 10% Discount code: 10BuyitFixit Official Website: https://bit.ly/3ZUMEe8 Amazon UK: https://amzn.to/4dFLyGn Amazon USA: https://amzn.to/4dDc96E 10% Discount code: 10BuyitFixit TM4K-AF Max: 10.1" screen Official Website: https://bit.ly/3Yg68bZ Amazon UK: https://amzn.to/4eyDGYj Amazon USA: https://amzn.to/47ZJ5FB The Famous Blue Mat: https://amzn.to/47bPNGK Infiray P2 Pro Thermal Camera: https://amzn.to/47c05Xm 170 piece electronics tool kit (security bits): https://amzn.to/3VnmHBh SMD Tweezer set: https://amzn.to/3t9GlW4 Aixun T3A Soldering Station: https://amzn.to/3Xa8HMe Soldering Flux: https://amzn.to/3UDC0py Alternative: https://amzn.to/4dVRdcN Low Melt Solder: https://amzn.to/3QICZ5r : Cheaper Alternative https://amzn.to/3G4L3XK Grinding pen: https://amzn.to/3QCHE7v Component Tester: https://amzn.to/46UcHm6 alternative (slightly cheaper) https://amzn.to/49yZSzJ Overhead Camera Mount I Use: https://amzn.to/3tX8Ar4 Microscope Light (I use on my Trinocular): https://amzn.to/3FEAPgy AD409 Pro Microscope 10" Screen: https://amzn.to/3G0CI7P Extra Long Torx Drivers(used on Milwaukee radio): https://amzn.to/40siUU3 DC Power Adapter plugs 38 PCS: https://amzn.to/49lCUMm USB Power Meter Tester: https://amzn.to/3R6NX4g SMD Component ruler 3x (for sizes of SMD components): https://amzn.to/3TvfcWO Rework station: ATTEN ST-862D https://amzn.to/4hgn1uA Other Equipment: Main Overhead camera: Sony HDR-CX450 with 3rd party remote and RODE VideoMic Pro Other cameras: Canon G7X, iPhone 6s, Go Pro Hero Silver 7 (which I repaired on a video) Microscopes: Amscope trinocular (clone) with FHD 48MP Camera V8 & TOMLOV TM4K-AF Max. Editing Software: DaVinci Resolve The above links are amazon affiliate links, and I may receive a small amount from Amazon at no extra cost to you, if you choose to purchase an item. #electronics #electronicsrepair #repair Sinclair PDM35 Repair Sinclair PDM35 Troubleshooting Sinclair Pocket Digital Multimeter Repair Sinclair Digital Mutlimeter Repair Fixing A Sinclair Digital Mutlimeter repairing a Sinclair Digital Mutlimeter How to fix a Sinclair Digital Mutlimeter Sinclair PDM35 problems sinclair multimeter repair