18-12-2016, 06:10 AM
Thought I'd replied, must have forgotten to click submit.... The circuit makes sense now, as the 5v rail uses the bulk of the power available. I missed the voltage doubler, which they're doing as 9v rectified won't be enough after voltage drop from diodes, regulator chip and load I guess.
The chassis is definately live in regards to the 9v AC in pins of the power input pins. No biggy, just took the plug apart and disconnected the shield from the metal plug shell.
Here's the service manual, as you see it uses a lithium battery to power the SRAM memory when not in use. How would one replace a battery in such a situation as this? Un solder the battery whilst it's powered up? There is a "how to guide" online - http://se-server.ethz.ch/Staff/af/pdfs/Q...cement.pdf, but this involves loosing any settings etc. Mine is fine BTW, just curious.
Andy.
The chassis is definately live in regards to the 9v AC in pins of the power input pins. No biggy, just took the plug apart and disconnected the shield from the metal plug shell.
Here's the service manual, as you see it uses a lithium battery to power the SRAM memory when not in use. How would one replace a battery in such a situation as this? Un solder the battery whilst it's powered up? There is a "how to guide" online - http://se-server.ethz.ch/Staff/af/pdfs/Q...cement.pdf, but this involves loosing any settings etc. Mine is fine BTW, just curious.
Andy.
