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Search: Posts Made By: mmartell
Forum: Troubleshooting Audio Equipment 02-26-2021, 12:17 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I'm going to pull the amp board and go over it since there are a limited number of voltage checks I can do on the running amplifier section.

Incidentally, what should the channels look like as...
Forum: Troubleshooting Audio Equipment 02-25-2021, 05:09 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

You are right I do hear hum AND audio from each channel by touching those pins.

I redid the readings with D_Ground and they are the same. D_GROUND ohms out with chassis ground.
Forum: Troubleshooting Audio Equipment 02-25-2021, 04:22 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

Yes the DC_FRONT measures about 0.4v and the DC_SURROUND measures just under 0.6v. Neither is enough to turn on the protection if I'm reading the schematic correctly.

But in the way of an...
Forum: Troubleshooting Audio Equipment 02-25-2021, 02:41 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

Going to try to get some heat there but there in a hard spot and on the bottom of the board. Looking like I'll be pulling the board soon.
Forum: Troubleshooting Audio Equipment 02-25-2021, 02:34 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

A good idea but if you're talking about J5675 it's marked as "Open". I'd either have to remove components or cut a trace or two.



Will definitely do some of that before tearing the amp apart...
Forum: Troubleshooting Audio Equipment 02-25-2021, 10:47 AM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I was thinking there are three possible scenarios here, four if we count yours.

1) There is a leaking transistor in the DC PROTECTION circuit pulling the 3.3v to ground

2) The SWM_3.3v line...
Forum: Troubleshooting Audio Equipment 02-24-2021, 10:33 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I don't have the AVR-E300 board in, only tried it once to see if that amp board would stay on without giving a fault. It did not.

The DC PROT line is in fact changing. Starts out at about 3.2v and...
Forum: Troubleshooting Audio Equipment 02-24-2021, 07:54 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

Yes my mistake, was thinking of how you set to fully counter-clockwise before making idle-current adjustment (at least for receivers I've done that for)

The thing is the amp isn't in Protection...
Forum: Troubleshooting Audio Equipment 02-24-2021, 07:08 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

The pots are all set to minimum, or all the way counter-clockwise. However turning the pots in either direction has no effect on the readings at CN5x05.

I redid those readings with another meter...
Forum: Troubleshooting Audio Equipment 02-24-2021, 06:39 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

See post #14 for those readings.
Forum: Troubleshooting Audio Equipment 02-24-2021, 06:30 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

My meter doesn't have a Max function and the values are changing too rapidly to nail it down. Can I hook up my scope to chassis ground and probe pin2 without blowing it up ?
Forum: Troubleshooting Audio Equipment 02-24-2021, 01:57 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I wonder why the speaker relays click on but there is still nothing from the speakers or headphones before the protection turns everything off ? Could the HDMI board be causing this issue somehow ?
...
Forum: Troubleshooting Audio Equipment 02-24-2021, 01:31 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

Ya colour me confused. It seems to be affecting all channels. What was the problem in the Crown amp ?
Forum: Troubleshooting Audio Equipment 02-24-2021, 07:49 AM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

That part is referring to the bridge rectifier making the B+ and B- rails. Could be leaking somewhat will give it a diode check.
Forum: Troubleshooting Audio Equipment 02-23-2021, 10:55 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I don't know what you mean by that ?

Yes I have the 12v line and PRE B- getting to the preamp. And yes I agree it's common to all channels.

As stated earlier my B+ and B- rails are off by...
Forum: Troubleshooting TVs and Video Sources 02-23-2021, 10:25 PM
Replies: 11
Views: 267
Posted By mmartell
Re: Rca rhos651sm

You won't get any more help without posting a pic of the "horizontal lines running down" the screen.
Forum: Troubleshooting Audio Equipment 02-23-2021, 10:08 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

L5101-5501 all hover around 0.8v but go as low as 0.5 and as high as 1.1v on all channels.

The measurements were the same at the emitter resistors so I turned all pots down to minimum but the...
Forum: Troubleshooting TVs and Video Sources 02-23-2021, 09:30 PM
Replies: 11
Views: 267
Posted By mmartell
Re: Rca rhos651sm

Impossible to say without a pic of the anomaly.

Sounds like something is heating up. Feel around the tcon and the main board for an area or a component with excessive heat.

And post a pic of...
Forum: Troubleshooting Audio Equipment 02-23-2021, 10:24 AM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I have here a similar, possibly the same main board from an AVR-E300. There are no #18 wires as stated in the schematic there are only traces bottom side of board which lead to the collectors of the...
Forum: Troubleshooting Audio Equipment 02-23-2021, 09:10 AM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I can't get to that connector during operation but you'll notice the schematic says both the Main B+/- run direct to the collectors of the output transistors with nothing in between (except for...
Forum: Troubleshooting Audio Equipment 02-22-2021, 08:57 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I measured B+ and B- at the collector of each output transistor.

I think RJ means Q5702 only conducts after C5708 is charged up (?) so that PRE B- line starts up AFTER the main B+/- rails are...
Forum: Troubleshooting Audio Equipment 02-22-2021, 06:10 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

I think you're talking about Q5702 ? I don't know what it's purpose is but I would think if it was meant to bleed off voltage there would be a resistor to ground and not a cap ?

But yes if it's...
Forum: Troubleshooting Audio Equipment 02-22-2021, 10:57 AM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

Still -35.1v after sitting unplugged overnight. How is this voltage designed to dissipate ?
Forum: Troubleshooting Audio Equipment 02-21-2021, 08:47 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

This might be unrelated but after power down and unplugging the positive rail goes to zero but the negative rail only falls down to -35.4v and stays there. Is there a bleed resistor for the negative...
Forum: Troubleshooting Audio Equipment 02-16-2021, 01:47 PM
Replies: 45
Views: 1,366
Posted By mmartell
Re: Denon AVR-X1000 MCU Shorted

Came across an HDMI board from the sister unit (AVR-E300) and transplanted the MCU into the non-working board.

Unit boots up and all buttons and knobs function but the unit goes into DC Protect...
Showing results 1 to 25 of 500

 
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