December 2022
Macintosh Color Classic
Several years ago while at my daughter's house, I noticed an old classic Mac in her neighbor's garage; "classic" being the small all-in-1 form factor with a 9" CRT. It was a model that I did not recognize so asked him about it. He was clearing stuff out so I paid him $20 for it, not knowing if it worked or not. Turned out that it didn't boot up so it sat in my basement until this last Fall when I was taking inventory. Investigating further I learned that this Color Classic Mac was the last classic model sold in the US and only model with a color display. It was built in 1993 and followed up with a Color Classic II sold only in Japan. See https://everymac.com/systems/apple/mac_classic/specs/mac_colorclassic.html#macspecs1 or https://apps.apple.com/app/mactracker/id311421597 for further information,
I had seen some YouTube videos of these older Macs being recapped, which includes replacing old capacitors that leaked and corrupted the circuit boards. Since I am no good with soldering these small components or trouble shooting, I found a place in New York that would fix it for me. I pulled out the two circuit boards and shipped them to Amiga of Rochester for repair. My CC was even featured in their YouTube videos as it was being repaired on Oct 27 and Nov 4.
In a couple of weeks, I received the repaired boards back. After replacing the boards in the CC and powering it on, I could see it working but the display was not looking right. It had colored vertical shadows. I tried adjusting the controls for the built-in Trinitron, following instructions in Apple's repair guide but could not get it resolved. I found a bent pin on the CRT yoke connector and cleaned the boards bus connectors. Then I was able to adjust the convergence and fixed the image. See following images affected by crt scanning capture
Display before adjustment
Display test pattern for convergence
FInal Display with Hypercard Color Selection
I had seen some YouTube videos of these older Macs being recapped, which includes replacing old capacitors that leaked and corrupted the circuit boards. Since I am no good with soldering these small components or trouble shooting, I found a place in New York that would fix it for me. I pulled out the two circuit boards and shipped them to Amiga of Rochester for repair. My CC was even featured in their YouTube videos as it was being repaired on Oct 27 and Nov 4.
In a couple of weeks, I received the repaired boards back. After replacing the boards in the CC and powering it on, I could see it working but the display was not looking right. It had colored vertical shadows. I tried adjusting the controls for the built-in Trinitron, following instructions in Apple's repair guide but could not get it resolved. I found a bent pin on the CRT yoke connector and cleaned the boards bus connectors. Then I was able to adjust the convergence and fixed the image. See following images affected by crt scanning capture
Display before adjustment
Display test pattern for convergence
FInal Display with Hypercard Color Selection