jdg123
Active Member
I have only the faintest notion of what I am doing here, no on-site mentor to show me things so forgive my trepidations but I am very hopeful for the life of my CR-2020 continuing and I am oh-so-close to getting it up and running…I'd hate to make a stupid mistake now.
I have replaced almost every cap in the unit and some of the key resistors. I have executed the service bulletins. The unit comes on/plays for about 30 seconds but then it clicks off. It has been suggested that the bias/idle current may be way off and thus enacting the "protection circuit".
Taking a reading will have to be quick and I am unsure of how to set up my DMM.
On page 12 of the service manual it talks about connecting points TP1 and TP0. That is where I am unsure. TP1 is clear; it is marked on the board even. Is "TP0" (in the picture) that first solder connection? I am really, really new to this stuff
I know voltage measurements are supposed to be done with polarity in mind and between two specific points but I am never sure what two points! I need arrows; I need explicit directions…I need help, please...
When I am sure of where to clip my leads I will try to get a reading on the idle current in the few seconds I get before the protection clicks on and then I guess a second time to get the turn direction of the adjustment resistor correct and then some more adjustments until I get to the specified 10mA. I just need a little help here.:thmbsp:
I have replaced almost every cap in the unit and some of the key resistors. I have executed the service bulletins. The unit comes on/plays for about 30 seconds but then it clicks off. It has been suggested that the bias/idle current may be way off and thus enacting the "protection circuit".
Taking a reading will have to be quick and I am unsure of how to set up my DMM.
On page 12 of the service manual it talks about connecting points TP1 and TP0. That is where I am unsure. TP1 is clear; it is marked on the board even. Is "TP0" (in the picture) that first solder connection? I am really, really new to this stuff
I know voltage measurements are supposed to be done with polarity in mind and between two specific points but I am never sure what two points! I need arrows; I need explicit directions…I need help, please...
When I am sure of where to clip my leads I will try to get a reading on the idle current in the few seconds I get before the protection clicks on and then I guess a second time to get the turn direction of the adjustment resistor correct and then some more adjustments until I get to the specified 10mA. I just need a little help here.:thmbsp: