Hi everyone! doing electronics since nearly 40 years now - but believe it or not: i joined the forum today...! Background is an issue w/ the Marantz PM8000 amp, being capable of switching between AB- and Class-A mode. Problem: The main (primary sided) fuse (3.15A/250V) gets destroyed, when connecting preamp w/ power stage. As long as the power stage is open, the fuse is OK - having no sound, of course. FYI: These two functional blocks are connected via two 100R resistors on each channel. Currently i do not have any ideas anymore... So i would be glad for any hint! Thanks Andi (lcdguru)
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First of all you should download the service manual: https://elektrotanya.com/marantz_pm7000-pm8000_power_amplifier_sm.pdf/download.html
Andi K. wrote: > Problem: The main (primary sided) fuse (3.15A/250V) gets destroyed, when > connecting preamp w/ power stage. As long as the power stage is open, > the fuse is OK - having no sound, of course One of the many questions: Does the Powerstage work with another signal e.g. a signal generator when the premap is disconnected? If yes, did you observe the output of the preamp with an oscilloscpe yet?
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