Post by derek on Aug 13, 2023 0:46:23 GMT
Hello all. Please bear with me as this is my first post, and I am hoping I did it properly!
I have two Rowe/AMI CD-100 jukeboxes. One of them has developed a problem with the 8V power supply, or at least I thought that's what was wrong since it was reading 7.7V at the CCC and Mech Control units. I ended up pulling the supply and bench testing it. On my bench the output is about 9.2V unloaded. Which brings up my question for you all: Is there a specification for output current for the 8V supply? I have an electronic load which I can use to put variable loads on the supply and it looks "OK" up to 3A. Anywhere over 3A at it goes into current limit. I can also load it with a transient load switching on and off at 0 and 2A at 1000 Hz with a 50% duty cycle and that is "OK" also, although the output drops to about 8V during the load on time. The output drops to 0 when the load is greater than about 2.2A in my transient testing. All of these measurements are great -- except that I don't know how much current the supply is actually supposed to put out in real life. I should also note that this power supply board is a stock board that doesn't have any of the changes to boost the 8V output. Because of what i've seen here and elsewhere, I have pretty much decided that the 8V output is probably OK, and that the real issue I was seeing is caused by poor connector contacts. But if anyone knows what the 8V output current is that this supply needs to handle, please let me know and thanks!
I have two Rowe/AMI CD-100 jukeboxes. One of them has developed a problem with the 8V power supply, or at least I thought that's what was wrong since it was reading 7.7V at the CCC and Mech Control units. I ended up pulling the supply and bench testing it. On my bench the output is about 9.2V unloaded. Which brings up my question for you all: Is there a specification for output current for the 8V supply? I have an electronic load which I can use to put variable loads on the supply and it looks "OK" up to 3A. Anywhere over 3A at it goes into current limit. I can also load it with a transient load switching on and off at 0 and 2A at 1000 Hz with a 50% duty cycle and that is "OK" also, although the output drops to about 8V during the load on time. The output drops to 0 when the load is greater than about 2.2A in my transient testing. All of these measurements are great -- except that I don't know how much current the supply is actually supposed to put out in real life. I should also note that this power supply board is a stock board that doesn't have any of the changes to boost the 8V output. Because of what i've seen here and elsewhere, I have pretty much decided that the 8V output is probably OK, and that the real issue I was seeing is caused by poor connector contacts. But if anyone knows what the 8V output current is that this supply needs to handle, please let me know and thanks!
