Hello All,
First time poster on AK (longtime lurker!). I just got a 9090 (not a 9090db) from a thrift shop, so not sure about its history. Was definitely in a smoker's house due to tar all over it. VERY dusty/dirty inside so I vacuumed it out and did basic clean up. Got the dial lights working with the simple wire switch trick from the Sticky.
It has the blinking red button issue that appears to be common in the 8080/9090. It will just not go out of protection mode. If I pull out the Driver Circuit Board (F-2436) the protection light goes green and all is well. I have read over tons of the other threads and my guess is that I have a "fusible resistor" issue and need to replace some of the resistors. I am very handy and have done some basic soldering in the past, but I am self taught and by no means a pro. But, I am not scared to remove the resistors and replace them.
My question is: due to my relative inexperience, is there an order I should go in with the resistors? (I know they are in pairs for left/right) Does anyone know the MOST likely to LEAST likely ones I should be pulling out to test and potentially replace? Is it worth just doing all of them? I do not relish the idea of doing more than I must because of my lack of skill. I would also like to order everything I need at one time because its the shipping that is so expensive. I already have the Service Manual and a multimeter. Basically, after reading all these posts, there is some confusion on my part as to which resistors on the board should be changed.
Should I try to measure the DC Offset before getting into the resistors? I understand that is like taking the receiver's "temperature". I have not yet used Deoxit to clean switches/pots either. I wanted to wait until I knew I could get the thing working. Do y'all think I am approaching this project correctly or should I be doing something else? Thanks, and any advice is welcome advice!
First time poster on AK (longtime lurker!). I just got a 9090 (not a 9090db) from a thrift shop, so not sure about its history. Was definitely in a smoker's house due to tar all over it. VERY dusty/dirty inside so I vacuumed it out and did basic clean up. Got the dial lights working with the simple wire switch trick from the Sticky.
It has the blinking red button issue that appears to be common in the 8080/9090. It will just not go out of protection mode. If I pull out the Driver Circuit Board (F-2436) the protection light goes green and all is well. I have read over tons of the other threads and my guess is that I have a "fusible resistor" issue and need to replace some of the resistors. I am very handy and have done some basic soldering in the past, but I am self taught and by no means a pro. But, I am not scared to remove the resistors and replace them.
My question is: due to my relative inexperience, is there an order I should go in with the resistors? (I know they are in pairs for left/right) Does anyone know the MOST likely to LEAST likely ones I should be pulling out to test and potentially replace? Is it worth just doing all of them? I do not relish the idea of doing more than I must because of my lack of skill. I would also like to order everything I need at one time because its the shipping that is so expensive. I already have the Service Manual and a multimeter. Basically, after reading all these posts, there is some confusion on my part as to which resistors on the board should be changed.
Should I try to measure the DC Offset before getting into the resistors? I understand that is like taking the receiver's "temperature". I have not yet used Deoxit to clean switches/pots either. I wanted to wait until I knew I could get the thing working. Do y'all think I am approaching this project correctly or should I be doing something else? Thanks, and any advice is welcome advice!
