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Post by mastertech on Jan 17, 2022 18:40:00 GMT -5
Ok, I think what I would do now is try to identify all ic's between and including ADC and DAC and then start testing supply voltages on each individual ic.
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Post by mastertech on Jan 17, 2022 18:42:43 GMT -5
Oh, just a thought. The signal coming out of the DAC may be low. Did you try turning up the volume on the tracer receiver just to be sure there is no audio there?
Turning up volume on bad receiver will not make any difference. This is why I had you check that earlier.
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Post by mmartell on Jan 17, 2022 23:06:48 GMT -5
So on page 80 they show wave forms that should be seen between the various ic's of interest to me but I'm confused if that requires a specific input or these should be active and similar regardless of what is input ? Or is there a standard of a 1khz sine wave input maybe ?
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srt
Junior Member
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Post by srt on Jan 18, 2022 6:35:47 GMT -5
As my experience Denon having minimal digital signal processing even it in direct or pure direct mode,
Can you please check your hdmi out is working? in some model of denon there is no sound output if HDMI out not works
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srt
Junior Member
Posts: 90
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Post by srt on Jan 18, 2022 7:41:10 GMT -5
So on page 80 they show wave forms that should be seen between the various ic's of interest to me but I'm confused if that requires a specific input or these should be active and similar regardless of what is input ? Or is there a standard of a 1khz sine wave input maybe ? Just Select input cab/sat and make analogue input in setting then check the voltages at pin 17,18,19 20, it should be around 1.6 volts then same also check at IC812 pin6,7,8 & 14 . |
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Post by mmartell on Jan 18, 2022 10:37:54 GMT -5
As my experience Denon having minimal digital signal processing even it in direct or pure direct mode, Can you please check your hdmi out is working? in some model of denon there is no sound output if HDMI out not works This is interesting. I stated in the first half of this thread which was accidentally deleted that I had previously removed the main HDMI switch IC as it was bad and I was waiting to solve the no audio issue before replacing with a new one.
Your point about minimal processing is noted and shared by mastertech. In some places the SM states otherwise but can't always be believed I guess.
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Post by mmartell on Jan 18, 2022 10:45:01 GMT -5
So on page 80 they show wave forms that should be seen between the various ic's of interest to me but I'm confused if that requires a specific input or these should be active and similar regardless of what is input ? Or is there a standard of a 1khz sine wave input maybe ? Just Select input cab/sat and make analogue input in setting then check the voltages at pin 17,18,19 20, it should be around 1.6 volts then same also check at IC812 pin6,7,8 & 14 . Will check. Thanks. |
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Post by mastertech on Jan 18, 2022 12:36:37 GMT -5
So on page 80 they show wave forms that should be seen between the various ic's of interest to me but I'm confused if that requires a specific input or these should be active and similar regardless of what is input ? Or is there a standard of a 1khz sine wave input maybe ? I believe they want a digital signal coming in on the coax line. Is your scope digital and capable of reading a digital signal? I think if it was me, since the unit turns on I would be doing "special mode" diagnostics, (page 18 and forward) and see if you have all firmware's, any error's or error codes. And diagnostic mode (page 27 and forward.) Also, do you have adapter for your programmer to read ic783? I have other thoughts but this would be a good start. |
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Post by mmartell on Jan 18, 2022 17:39:05 GMT -5
Just Select input cab/sat and make analogue input in setting then check the voltages at pin 17,18,19 20, it should be around 1.6 volts then same also check at IC812 pin6,7,8 & 14 . Will check. Thanks. I see nothing on the data line either with my dmm or my scope. The other lines are active as seen on page 80 of the SM. |
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Post by mmartell on Jan 18, 2022 23:02:46 GMT -5
I believe they want a digital signal coming in on the coax line. Is your scope digital and capable of reading a digital signal? I think if it was me, since the unit turns on I would be doing "special mode" diagnostics, (page 18 and forward) and see if you have all firmware's, any error's or error codes. And diagnostic mode (page 27 and forward.) Also, do you have adapter for your programmer to read ic783? I have other thoughts but this would be a good start. You called it.
DSP ERROR 01: "When DSP code boot is performed, the DSP FLAG0 port does not change to "H" even if DSP reset is executed.
Checking the reset line... |
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Post by mmartell on Jan 19, 2022 0:03:16 GMT -5
Reset line and FLAGS0 check out good back to the mcu.
Should I be suspecting a bad DSP ? How can I verify ?
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Post by mastertech on Jan 19, 2022 11:57:03 GMT -5
At this point you cannot suspect anything because the error code may not be a direct affect but rather just a result from another problem else where.
We are just looking for a direction to go.
When you say those lines check good I am assuming you just mean you did a continuity check, and the 1 line was 0 ohm and the other was 33 ohm?
I would locate R7923 on that "FLAG0" line, receiver off, set my voltmeter to DC and hold my pos probe on the side of that resistor going to the CPU and turn on receiver and see if the CPU sends any voltage. Give it 5 to 10 seconds. Then turn it off, switch probe to other side of resistor and turn it back on and watch for any voltage. Do the same for reset line and let me know.
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Post by mmartell on Jan 19, 2022 13:15:33 GMT -5
R7923 is under the board but I can test at TP1 and the mcu.
Likewise Reset has no resistors in it's path and can only be tested at the pins of both ic's.
Does that work ?
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Post by mastertech on Jan 19, 2022 13:29:22 GMT -5
Yes
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Post by mastertech on Jan 19, 2022 13:43:55 GMT -5
I just happened to think. I believe you are still in direct or pure direct mode. I would suggest changing the sound mode to something else since we do not know if any of the processing ic's are idled or muted when in direct.
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