PM-68 Marantz Receiver keeps shutting off sound after a few
Very frustrating! The receiver (regardless of source and output/types of speakers) continually kick out after a short period of play. It will play wonderfully then "click" off occasionally coming backing on, only to click off again.
I feel like I've tried every permutation of possibilities (from different wall sockets to speakers) to try to nail down this problem...
Purchased this second hand sight unseen from forum for relatively cheap. thinking i got ripped off at this point.
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I do not think your use of an equalizer has caused any problems. I will explain the proper use of the source/direct button. This button's function is to monitor the output of a recorder connected to the record outputs of your amp. When this button is pressed on the sound going to the speakers comes direct from the "source" (cd, radio tuner, phonograph etc.) when in the off position you can monitor the recording of whatever source is being recorded via the tape deck. This switch must be off to record through the amps record outputs.
To test this, put a blank tape in the tape deck, choose the source as phono and place the dec in record/pause. With the source direct button pressed on you should hear a change in volume when moving the amp's volume knob only. When source direct is off you will be able to hear the output of the tape deck, so adjusting the tape deck's record level will also affect the volume coming out of the speakers. more record level in/ more level out.!
Below is copied from page 9 of your user operation manual for Marantz's explanation of the source/direct button.
best of wishes, Michael Mittelsdorf
Your no doubt finding the speaker safety/turn on surge protect relay NOT engaging a few seconds after turning it on-right? Check the output transistors. These are the big green and black ones screwed to the heatsink. You gain access to them by taking off the bottom cover. There's 4 per channel--2 green and 2 black. You'll probably find one or more of them shorted. If you find replacements, put them in exactly as the originals with new thermal grease/heatsink compound. Unsolder and lift the center pin (collector) on each of the four transistors of the effected channel. Power it up and check across the outside pins of each device for proper bias-about a half a volt or so on each one. If the voltage is much higher, or not there you've got other problems that will require more diagnostic/troubleshooting. Do all the lights on the front panel work-or just the tape monitor indicators? If just the tape monitors light up, check resistors RN83 and RN84 on main board under the speaker connector board-remove the speaker connector board to get at them. These are bad on mine and I've yet to replace them. I believe these to be 920 ohm 1% precision resistors....
Ya, it sound like you just blowed the output on one of the stages, I would disconect the speakers to see if the problem still is there, second open the top cover, there should be about 7 fuses check for a blowed one, last hope it's not an output, if you never worked on an amp, you will cause more problem.
Hope this help