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willis
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Post subject: Adding digital audio and ac3 RF to 50 disc auto-changer Posted: 25 Oct 2021, 17:22 |
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Joined: 13 Feb 2019, 14:35 Posts: 10 Location: United States Has thanked: 0 time Been thanked: 0 time
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Trying to get both digital audio and ac3 RF out of my lc-v200 50 disc auto-changer. I started with digital audio figuring it should be the easiest. The two players within the changer have the same EMF decoder as the player found in the linked thread below (CXD2500AQ) Pioneer CLD-M90 now modded for AC-3 RF and Digital OutputsBoth decoder chips feed to a DAC which is located on the door of the changer unit. But before the signals go into the DAC both digital out circuits are fed to a chip (ic201 positions 2 and 3) that select which signal to output depending upon which player has been commanded to run. The output side of ic201 at pin 22 a single digital out signal exists that goes into the onboard DAC. To capture my digital signal I tapped into the circuit the pin 22 location, prior to a resistor (209) which resides between the DAC and ic201. I used the same pcb purchased from eBay found in the thread above, I have proper 5v power as the red optical light is working, however I do not have any sound from either coax or optical source. I'm not the most knowledgable on circuit designs and was hoping someone here might be able to compare the diagrams and tell me where I'm going wrong. The manual for the auto changer is loaded to the database here, and the information can be found on page 66 (ic201) and 109 (EMF decoder). Any help would be much appreciated. I wanted to tackle this first before attempting the ac3 rf mod.
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willis
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Post subject: Re: Adding digital audio and ac3 RF to 50 disc auto-changer Posted: 27 Oct 2021, 14:19 |
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Joined: 13 Feb 2019, 14:35 Posts: 10 Location: United States Has thanked: 0 time Been thanked: 0 time
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cplusplus wrote: Are we looking at same schematic? I see one DAC IC201 with one digital input at Pin 8. The service manual is a bit confusing. The DAC handles the digital audio signal for both players at ic202, where pin 8 is the digital in. I believe this is the chip you are seeing on the schematic. Both players send the digital out signal to ic201 to pins 2 & 3, then depending upon which player is commanded ic201 outputs a single digital signal on pin 22. Pin 22 feeds the DAC at pin 8. I believe I may have found the issue, the digital signal voltages are dropped from 5v to 2.4v prior to entering into the switching chip ic201. In the post I linked to they tapped the EFM decoder chip digital out signal which is at 5v.
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willis
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Post subject: Re: Adding digital audio and ac3 RF to 50 disc auto-changer Posted: 27 Oct 2021, 14:42 |
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Joined: 13 Feb 2019, 14:35 Posts: 10 Location: United States Has thanked: 0 time Been thanked: 0 time
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ldfan wrote: I considered replying but I was so confused regarding the service manual and how the two players interact with the CO unit.
Is there an instruction manual available on how to set-up the system? If not, some images of the jukebox connected to the CO unit would be appreciated. The co unit doesn't do anything except command the players on, command the disc loader, and allow the karaoke portions to work (mixing the mic audio and such which I don't use). So the co unit doesn't really play into modifying the disc changer unit. All of the audio circuitry takes place on a pcb mounted to the door of the changer unit. Instead of doubling up on audio circuitry they removed all of it from the players and had them share a single pcb using a switching circuit which the co commands. You can put in multiple disc requests at one time and the co unit simply loads the discs requested and commands the player on which holds the requested disc. All audio and video can be input into the co unit but isn't necessary. I run both audio and video straight from the disc changer into my receiver.
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