CVP-209 Schematic diagram

[wengsan]

The handphone jack of my CVP-209 only have sound on the left channel. I had trace the wiring and found it lead to a amplifier circuit board. I belive that some componet od this circuit board might be faulty.

Is there a diagnosis program that I can run on to CVP209?

Any one has the schematic diagram of the CVP-209 ?

[r_d_wilson_47714]

Before you go tearing into your CVP-209, be absolutely certain your headphones themselves are working correctly. Check the plug end of the phones to make sure all wires are connected and working properly.

Perhaps try another set of phones on your CVP-209 also...:confused:

[wengsan]

I have check the headphone on my Korg Pa1x. No problem.

[cowpast]

According to the schematic, the phone jacks are on a small circuit board (HP).This board is not wired directly to the Power Amp board. It's cabled through a 7 pin connector to the circuit board (A-Jack) that contains the Aux-In/Out and Video Out jacks underneath the console.
That board also contains a relay (something to do with speaker muting) and from that circuit board are cables connected to the Power Amp board.

To narrow down the problem you can first check to see if you have sound at the jacks labeled "Aux Out L/L+R..... R" (not the RCA jacks). If so, then the problem could be with either the 7 pin connector from the A-jack board (underneath) to the Phone Jack board or in the headset jack itself.

One caveat... the best way to check this is to connect BOTH the left and right channels separately to an external stereo amp. In other words do not just use one cable connected to the L/L+R jack.
I hope this makes sense.

From what I can see, if there is no sound at these jacks you are probably going to need a technician.

Phil

[wengsan]

From the phone jack board, there was connecting wire going to the A-jack board. I have check the output of Aux Out L/L+R of the A-jack board. Right channel did not sound. So this problem will likely goes down to the amp board which I guess also supply power to the rest of the circuit.

[wengsan]

I have did a diagnosis test. The right channel internal speaker do not sound also. I have insert audio signal at the audio in left and right jack. I can hear signal from both left and right speaker.

So the amp board might not have problem after all.

This lead to the a Ajack board or worse, the main tone generator and controller board.

[cowpast]

Based on what you have said the Amp board seems to be OK.

To eliminate the A Jack board as the problem, try inserting an audio signal through the "AUX In R" only. Check for sound on the right speaker, you can also check for sound on the "AUX OUT Level Fixed R Jack"( the RCA Jack).

If they check OK then that probably puts the problem back to the 12 pin CN500 cable and connectors which connect the A Jack board to the DM board or to the DM Board itself. I hope the problem is with the cable and not the board.

Phil

[wengsan]

Today , the service engineer came and replace the Ajack board.
Still the Right channel sound is missing.

I think the problem is most likely to be the DM board DAC IC or the op-amp IC having problem.

This board is using a burr brown DAC PCM1702 for left and right channel I think, where this signal will go to some opamp IC.

[cowpast]

Wengsan,

Trying to analyze the trouble down to the component level of a board is a waste of time. It could be any number of things and failed boards are just replaced anyway.

Instead of simply replacing the A Jack board, the "technician" should have at least performed the simple checks mentioned above which would have eliminated it as the problem.

The problem could still just be with the connecting cable, even just a loose connection. If so, it could possibly have been corrected on the first visit. If that was not the problem then at least he would have known that he needed to come back with the DM Board.

I hope this is a warranty job and it's Yamaha, not you, who will be paying the bill for this repair.

Phil