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Post by 24century on Nov 28, 2014 18:18:33 GMT -5
Marantz SR7002 unit use to work and it produce decent sound now it quit working – Front power light blinks every sec and unit will not turns on even none of the wire connected except the power cord.
Did reset (Multi+ Speaker A/B) has no reaction, did Pure Direct/7.1 Input/Clear unit turns on abt 2-3 secs then back to the same stage. will post photos on disassemble and repair procedures once has advise
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Post by mastertech on Nov 28, 2014 20:39:03 GMT -5
Hi 24 century. Welcome.
Well I guess we might as well get right into it.
Go right to the standby board and locate relay RY701. Next to it is capacitor C792. I want to to solder a wire across the 2 legs. If they are close enough just use solder to bridge the 2 legs. This will activate the main transformer as soon as you plug it in so be careful when it is plugged in. And do not connect anything to the receiver like this.
Now go to the DSP board. Locate connector BN91. It should be a 2 wire connector. Plug in the receiver. Set your DMM on DC voltage and use pin 2 for neg probe and pin 1 for pos probe and give me that reading.
Now on same board locate connector BN38. DMM again on DC voltage. Use pin 16 for neg probe.
Then with pos probe test the following pins and insert your readings.
Pin 3-_____
Pin 4-_____
Pin 5-_____
Pin 6-_____
Pin 7-_____
Pin 8-_____
Pin 9-_____
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Post by 24century on Nov 30, 2014 15:23:05 GMT -5
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Post by 24century on Nov 30, 2014 15:34:12 GMT -5
Did open it up today, try to locate the correct board, standby board should be the one with the power switch from the front, correct? Have some difficulty with DSP board, need help with
From my understanding so far that Marantz is using some resister acting as fuses when volume goes to high power output it can damage those resister(s) cause losing the correct power, does that sound right?
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Post by mastertech on Nov 30, 2014 16:39:42 GMT -5
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Post by mastertech on Dec 2, 2014 10:25:19 GMT -5
How are you making out 24? Do you need better info on finding what your looking for?
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Post by 24century on Dec 3, 2014 11:32:30 GMT -5
I will be OK with the info (pics) you provided, give me a little time with work and kid. I need some quiet hours that I can concentrated, will post my progress right after, thx
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Post by 24century on Dec 6, 2014 19:01:25 GMT -5
Guess I do need further help on disassembly the boards, locate the standby board but not the dsp board, also any hint of how to disassemble the speaker out boards with banana jacks on? thx
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Post by mastertech on Dec 6, 2014 23:11:43 GMT -5
Unfortunately I cannot help you with exact location or layout or disassembly. I only have schematics to look at and can only guide you to where things need to be tested. If you tell me a location I give you cannot be tested then I can look for another location. You are the only one that can see what you are actually working on. I can only assume.
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Post by 24century on Dec 7, 2014 19:59:44 GMT -5
Will get a socket driver to disassemble from the bottom, one more experteer of yours needed here, while open and replacing the resistors on the standby power board, what type of resistor do you recommend? Metal Film or Carbon Film?
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Post by mastertech on Dec 7, 2014 23:42:19 GMT -5
I do not know what resistors you are referring to. Where did you read about this?
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Post by 24century on Dec 8, 2014 9:27:32 GMT -5
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Post by mastertech on Dec 8, 2014 10:16:07 GMT -5
Haha, well that guy seems to know what he is talking about, lol.
Seriously though, the connector test I gave you would be checking the 15 volt line along with the other protect lines.
Also, after looking at the pictures you posted it looks like the harness from the DSP board goes to the power board which is the one with all the speaker terminals. So testing at that board should be capable without disassembling the receiver. You seem hesitant on doing any testing though. Let me know if you want to do this.
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Post by 24century on Dec 8, 2014 12:22:52 GMT -5
I am willing to do the test if I know what I am looking at, that will make the diagnostic process much unique.
My principle is this is a power related problem for sure, in a certain condition, the unit has some kind of blow on component(s) make it not operational, by doing the reset (Pure Direct/7.1 Input/Clear), the relay react then shut it off again that means some components is not operate correctly.
Why multiple of this units start to malfunctioning this year, that will be a question.
Once you open up the case, you will realize the disassembly is not a small project, Marantz has a common power related problem, mind share the schematics drawing? My email is yuyi429@hotmail.com
Will follow the lead and do the testing as soon, thx again
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Post by 24century on Dec 8, 2014 12:47:42 GMT -5
by looking at the photo you post and mine, looks like the DSP board locate on the left mid, close to bottom analogg input panel (rear view) where the digital interface (SPDIF) with two 12V TRIGGER output is at
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