Chasing some help to try and sort out what's going on with my Sega SC-3000 I picked up a short while back. Long story short: Picked it (plus an Atari 2600) up in a trade for a yellowed C64c. Had no PSU/games, but powers on to the green/black screen + low pitched hum. Skip forward a couple of months and I managed to acquire a bunch of games for it (5 to be precise). They were known working, but when I tried them all the SC-3000 continued to show the green/black screen + hum.
So far I've:
- cleaned the cartridges with cotton buds & isopropyl. repeatedly
- Cleaned the cartridge slot using a credit cart wrapped with cleaning cloth and drowned in isoproyl (in/out motions only. no side to side!). Repeated this several times until the cloth was coming up clean!
- Pulled the board out and confirmed that all of the cartridge slot pins are making connection with the mainboard (including the pin that's missing half of it - 8th in from top right)
- Checked for any lifted traces or dodgy solder, but all looks a-ok. Ditto for the fuse!
I've also checked voltages off the regulator, cartridge slot & VRAM -
- The Voltage regulator is giving me +4.6v
- Both of the +5v points in the cartridge slot are at +4.4v
- The VRAM is showing +4.4v
Based on this, are the voltages a bit too low to power games, or are these within ok limits for the SC3000? any other suggestions of what I could do to get this bad boy back up and running?