Marantz SR6200 - No sound on right channel

[Francesc V.]

Hi:

I have this receiver on the table coming from a friend. The right channel is not working.
It has the same behaviour using analog input or digital input. Also using headphones have the same result...so I guess the problem won't be on the preamp card.

Any idea/suggestion where to start looking at?



Regards,
Francesc.

[Francesc V.]

Re: Marantz SR6200 - No sound on right channel

Hi:

I think I've done some progress with the unit.

Using a "test CD" I am tracing the signal using a 10Khz sound (track 5)

- The signal arrives ok for both channels to CN115 connector (marked in green)
- There is no R signal in CP201 connector (marked in red). This ones goes directly to the amplifier section. Only L signal in pin1 from this connector.

I've attached part from the "volume board"......This card is connected to CN115 connector. Pins 1&3 from CN115 are directly connected to IC513 (NJU7313AL) pins 27 and 2.

I see signal in these pins but not in the R output (pin 6). I only see signal in L output (pin 23).

I've ordered a new chip and let's see the outcome.

Regards,
Francesc.

[petehall347]

Re: Marantz SR6200 - No sound on right channel

ask your friend if they were hot plugging the inputs as this behaviour can and does break these sort of switches .
i have found in the past the dead channel will come back when switched to a different input than the one plugged into .

[Francesc V.]

Re: Marantz SR6200 - No sound on right channel

Sure, I will. It makes sense that this might be the issue.

Also highlight that without service manual, finding these issues it might become impossible. Speaking from myself


Posting the service manual for reference just in case someone needs it in future.
Marantz SR5200-SR6200 service manual

Regards,
Francesc.

[Francesc V.]

Re: Marantz SR6200 - No sound on right channel

Hi:

Some follow up on this topic.

Changing NJU7313AL has not made any difference. I have the L+R inputs entering pin 2,27 but just the L output on pin 6 (nothing on pin 23). So maybe the previous chip was ok and it's something different.

Looking at the datasheet, I should have bit9 and bit10 enabled to have both outputs (L&R), but I guess the current situation might be that only bit10 is enabled.

I guess all this digital data is coming from DATA (17), CK(16) and ST (13). And all these pins come directly from IC107 (CXP740096).

This is getting complicated.

Any tip / suggestion how to move forward?

Regards,
Francesc.

P.S: In Direct mode (pressing direct button), I have both outputs L&R.

[eccerr0r]

Re: Marantz SR6200 - No sound on right channel

are Data,Ck,St wiggling (I assume you have a scope?)

Take out C571FR temporarily to isolate IC501 volume IC from IC513 mux. Do you still get no output on pin 6 of IC513?

[budwich]

Re: Marantz SR6200 - No sound on right channel

did you check the subtending circuit / connection of the replaced ic to ensure that it isn't "shorted" in some form. Compare to the other working channel.

[Francesc V.]

Re: Marantz SR6200 - No sound on right channel

are Data,Ck,St wiggling (I assume you have a scope?)

Take out C571FR temporarily to isolate IC501 volume IC from IC513 mux. Do you still get no output on pin 6 of IC513?

Thank you ALL for your valuable feedback.


By removing the cap (I removed positive, so negative is the direct contact point with IC). No difference. Just the signal is there when "direct" is activated.

Data (pin 3), and clock (2) show noise........Maybe is because I am not doing something right. (GND is chassis).

I've attached a pair of pictures for reference.

Regards,
Francesc.

[Francesc V.]

Re: Marantz SR6200 - No sound on right channel

did you check the subtending circuit / connection of the replaced ic to ensure that it isn't "shorted" in some form. Compare to the other working channel.

Soldering is perfect..........no shorts so far. Going back to previous and original IC, same behaviour.

[budwich]

Re: Marantz SR6200 - No sound on right channel

test tones (internal) are working? what is the front panel display showing?

When you are indicating "direct", that is "source direct" as opposed to "7 ch input" (direct)? Have you tried that 7 ch input?

[budwich]

Re: Marantz SR6200 - No sound on right channel

Have you tried resetting the unit? Have you also tried the pre-outs?

[Francesc V.]

Re: Marantz SR6200 - No sound on right channel

Have you tried resetting the unit? Have you also tried the pre-outs?

Reseting the unit (press simultaneously the button A/D and DIMER for more then 3 seconds) didn't make any difference.

Test tones (internal) are working? what is the front panel display showing?

What do you mean by test tones?

When you are indicating "direct", that is "source direct" as opposed to "7 ch input" (direct)? Have you tried that 7 ch input?

Yes........one of the front buttons says "direct"