LaserDisc Database
https://forum.lddb.com/

[CLD-V2800] AC3 Mod RF point
https://forum.lddb.com/viewtopic.php?f=53&t=10363		 Page 1 of 1
Author:  ldstl [ 01 May 2022, 05:44 ]
Post subject:  [CLD-V2800] AC3 Mod RF point  Topic is solved
Hey all, I admit defeat here. I'm trying to mod my CLD-V2800 with AC3 just for fun. I've researched this a ton and cannot find the right tap point for the RF signal. Can anyone help? I've attached some photos here showing places I've tried. Also linked is the service manual for Pioneer CLJ-35 which has the same layout as the 2800. Any help is appreciated!

I was able to find clearly marked "RF" points on both the top and bottom, but connecting the board yields no signal.

Bottom Access with panel removed - Image

Bottom Access Tap Points - Image

Top Tap Points - Image

Service Manual Link - https://drive.google.com/file/d/1M1zsGR ... sp=sharing
Author:  ldfan [ 01 May 2022, 10:23 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
I can’t see the service manual; link appears to go nowhere.

Also, RF labels don’t always mean the RF you actually need. It could be the RF coming right off the laser pick-up (that’s what I discovered on my M90 mod). Easiest way to find the AFM RF is to first look for a Pioneer chip with the CX logo on it (this is the analog audio chip) and then identify a couple of band pass filters nearby. That is an approximate location of where you need to go.
Author:  ldstl [ 02 May 2022, 03:49 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
Thanks for the response, ldfan. I fixed the link to the service manual, sorry about that. Here it is - https://drive.google.com/file/d/1M1zsGR ... sp=sharing

I did try and find where the band pass filter is, but this SM was not as clear as others. I did attach a new photo below zoomed into Page 31 of the service manual showing what I think is the audio section. I'm learning as I go, and hope I don't run into too many more of these issues.

I do have a spare 2800 that I plan to take apart so I can correlate it to the SM and see if I can figure things out from there.

Image
Author:  ldfan [ 02 May 2022, 08:21 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
That link now leads to what appears is some Pioneer mini system :?.

Anyway, is it possible to get a pic of the audio board from possibly the top? I know this is a very compact player so I would think it's really packed.
Author:  cplusplus [ 02 May 2022, 14:08 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
If the CLD-V2800 uses same servo control IC, maybe pin 53?
Author:  ldstl [ 02 May 2022, 14:36 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
ldfan, absolutely correct on the odd service manual choice of mine, haha. I found the cross reference on this thread - V2800 service manual? (and de-emphasis tuning in general?)

I'll take a pic of the audio board later tonight. Like I said, I have a spare, so no big deal. I've mostly taken this player apart a couple times. It's a nice form factor but absolutely limited on space inside.

cplusplus, maybe a pic of the audio board would help? I'll get that posted later.
Author:  cplusplus [ 02 May 2022, 14:42 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
ldstl wrote:
cplusplus, maybe a pic of the audio board would help? I'll get that posted later.

I see the number now - IC901 PAC003A
Author:  ldstl [ 02 May 2022, 20:39 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
Here is a picture of the audio board and IC802
Image

I traced Pin 53 to where it terminates to a pad on the other end. On the other side of this board, there is a ribbon cable that jumps over to the video board.
Author:  cplusplus [ 03 May 2022, 00:31 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
Is that IC labeled PAC003A (or close to it)? I can't tell due to the flux on it.
Author:  ldstl [ 03 May 2022, 05:25 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
It's strange, in this player, it's actually a SANYO chip. Picture attached below. I did go ahead and solder up to pin 53 off the IC901 board but no AC3 signal. Back to the drawing board.

Image
Author:  ldstl [ 03 May 2022, 05:32 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
I found this on the SANYO chip

Image
Author:  cplusplus [ 03 May 2022, 14:19 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
I'm surprised there is a datasheet on that.

Anyway, IC901 is below the one you were tracing. I do not think that is a match either, since PLL Offset is on a different pin. It does not seem the SM you linked is a match.

Probably the easiest way to find the tap without SM is to look for the IC with the CX logo as ldfan mentioned, or look for AFM labeled somewhere.
Author:  ldstl [ 04 May 2022, 05:12 ]
Post subject:  Re: [CLD-V2800] AC3 Mod RF point
Consider this one solved! Cplusplus, my fault, I completely missed the chip you were talking about that I should try Pin 53 on :roll: . IC 901 was the chip I needed to aim for. I am attaching a new photo here showing the proper trace and what my wire connection ended up looking like.

Thanks!

Proper Trace to Pin 53 on Audio Chip IC 901
Image

Soldered wire
Image
Page 1 of 1 All times are UTC [ DST ]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/