I just uploaded the scanned and ocr'd (service) manuals in English and German for the 50+ years old Philips PM 2423 Digital Multimeter. They are very detailed and perfect for anyone who wants to repair and calibrate a unit:
https://archive.org/details/pm-2423-en
https://archive.org/details/pm-2423-de
#VintageElectronics #Philips #PM2423 #InternetArchive @internetarchive
I looked up the display controller used by the SC-55’s display, and I suspected it follows the extremely common pinout and protocol used by most text LCDs of the era. I realized I have a display that will work, although the layout of the LCD elements is naturally totally wrong. So I wired it up, and it displays perfectly, confirming that the problem is indeed the SC-55’s display.
Unfortunately those are getting rarer and rarer to come by. There’s a small chance I can repair the existing display *if* I can identify the problem, find replacement ICs, and manage the very fiddly fine SMT desoldering/soldering that would be needed… but I may be better off just keeping an eye on eBay. #electronics #roland #soundcanvas #vintageelectronics #synth
Made progress on getting the broken Roland SoundCanvas SC-55mkII that I got for cheap on eBay to work! I was fairly sure a clock signal (or rather the absence of one) was the culprit, and after poking around the board tracing clock signals I found a spot where one abruptly stopped.
Turns out a 40MHz low-pass filter was missing entirely from the board! After bodging it with a wire (since it’s just a filter, so the worst that happens is noise causes occasional problems), the unit came up! 🎉 But the display has issues. Half of it is dead, and the first letter of the instrument name is garbled. This appears unrelated to the first problem, and suggests an issue with the display board itself; all lines going to the display look good.
Given that another filter on the board was already bodge-wired, and a 455MHz crystal (only needed for the remote) was cut out, *and* given this display problem, I think this may have been a parts unit for someone.
#electronics #roland #soundcanvas #vintageelectronics #synth
If you are getting started with servicing #VintageComputing gear or #VintageElectronics, you may be like me and scratching your head wondering about negative and positive sides/legs of capacitors.
I found the Identifying Capacitor Polarization page on DigiKey.com to be helpful.
https://www.digikey.com/en/blog/identifying-capacitor-polarization
180 Watt standby power consumption.
I love how they explain that there are transistors on the inside. Possibly to argue with the "more tubes, more better" crowd?
#vintage #electronics #vintageelectronics #tuberadio #jukebox
Tomorrow !!! #DDRC #Bootsale in Luton Sunday 18th May
#HAMRadio #RetroComputing #VintageElectronics
For folks around #Hertfordshire and #Bedfordshire who are into vintage electronics, retro computing or radio ham kit here is a date for your diaries. On Sunday 18th May Dunstable Downs Radio Club #DDRC hold their annual boot sale at Stockwood Park, Luton. Entry is free. Parking is £4 per car. More details on DDRC's website https://dunstabledownsradioclub.org/bootsale/visitors #bootsale #retrocomputing #retrogaming #hamradio
Just 1 week to go until #DDRC #Bootsale in Luton Sunday 18th May
#HAMRadio #RetroComputing #VintageElectronics
For folks around #Hertfordshire and #Bedfordshire who are into vintage electronics, retro computing or radio ham kit here is a date for your diaries. On Sunday 18th May Dunstable Downs Radio Club #DDRC hold their annual boot sale at Stockwood Park, Luton. Entry is free. Parking is £4 per car. More details on DDRC's website https://dunstabledownsradioclub.org/bootsale/visitors #bootsale #retrocomputing #retrogaming #hamradio
Just 2 weeks to go until #DDRC #Bootsale in Luton Sunday 18th May
#HAMRadio #RetroComputing #VintageElectronics
For folks around #Hertfordshire and #Bedfordshire who are into vintage electronics, retro computing or radio ham kit here is a date for your diaries. On Sunday 18th May Dunstable Downs Radio Club #DDRC hold their annual boot sale at Stockwood Park, Luton. Entry is free. Parking is £4 per car. More details on DDRC's website https://dunstabledownsradioclub.org/bootsale/visitors #bootsale #retrocomputing #retrogaming #hamradio
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