I got an Amiga CD32 without colour on the S-Video output on my work bench. Schematic of S-Video ouput. I tested input signal (Base) of the Q282 2N3904 (NPN) transistor, result is ok (see picture above). Ouput signal: That’s not what it should be, so replaced transistor Q282, result after replacement is still the same. […]
Tag: amiga
Amiga 4000 RTC not found
Sometime a RTC doesn’t work on an Amiga 4000. It can be a trace or via, but if they are all connected and test good the most common issue with this is a “floating” ground (pin 8) of U177. Or the RP5C01 RTC chip is dead 🙂 If we check the ground pin we see a […]
Amiga with 2 internal drives (gotek & diskdrive) (Poor men solution)
In this post i’m going to show you how to make it technical posible to have 2 drives (Gotek & disk drive) inside a Amiga 500, 600 or 1200. The internal FDD header (CN11) does not have all the needed signals to add 2 drives to this header, it’s imposible to have a DF0 & […]
Amiga CD32 SX-32 MK2 problem
Problem: CD32 with SX32 expansion won’t boot, yellow screen A few thing I tested: Boot CD32 without module, booting Boot with backplane and sx32, no boot yellow screen Boot with backplane only, strange behavior, no boot, sometimes some glitches. Change jumpers, for memory, no change. (see: jumper settings) After the basic test, I was wondering […]
Amiga 4000 – A3640 boot problem
A while ago I had an Amiga 4000 that boots fine with an A3630, but A3640 (or A3660) won’t boot. I spent many hours to find the problem, couldn’t find it. So I left the board for a week or two, after that I inspected everything again, and everything seemed ok. There was one thing […]