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Old 22nd July 2004, 12:11 PM   #1
sek is offline sek  Germany
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Default CD player chipset programming

Hello there,

I'm planning to modify (read: rebuild ) a Technics SL-PG CD player around an old (cheap but good) Philips CD transport. It uses a standard chipset from Panasonic, the MN66271 (a LSI chip for signal processing etc.).

While the manufacturer's datasheet for that IC is easily available, any information about it's microcontroller interface and programming is not. The Technics player 'features' a NEC controller that I can't reuse.

I want to interface the MN66271 to a uC like an AVR. Can someone provide some information on how to interface to and how to program the MN66271?

Thanks,
Sebastian.

PS:
Currently I'm not interrested in a replacement for the MN66271, nor in reclocking or output interface issues, just the interfacing and programming of the LSI.
Reclocked S/P-DIF and AES/EBU output, VFD with convenient buttons and a dedicated quality power supply are planned, though...
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Old 22nd July 2004, 11:00 PM   #2
sek is offline sek  Germany
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Okay, after more than 40 views without response I think I make myself a little more clear

The Panasonic MN66271 is an integrated CD player controller chip.
I want to use the good Philips CD transport and it's (not too good) chipset in a DIY way.

What I want to do is: build a good power supply and a digital-out interface for the working transport and chipset. Then put everything into a beautiful enclosure and - almost done.

What this setup is missing would be the user interface, which has to be done with a microcontroller. The player currently features a NEC78042.

While I have no problems to program a microcontroller, I just don't know what commands the MN66271 takes in which format, and how it responds to the controller.

The datasheet (without the software documentation) for the MN66271 can be found here. The IC has a serial interface (3 wire) which could be reverse engineered, but I'm lacking experience and equipment for doing so.

If anyone could provide any kind of information and/or experience on how such LSI CD player chips are interfaced, any help would be very appreciated.

Sebastian.
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Old 23rd July 2004, 06:23 PM   #3
sek is offline sek  Germany
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80 views and still no reply...

Okay, let's get a little broader. Does anyone of you know how to program any such chip using a microcontroller? It's only about the user interface, folks. The controller just has to drive the front panel elements of the CD player. Everything else is fine.
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Old 27th December 2014, 07:03 PM   #4
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http://www.lampizator.eu/lampizator/...NG/MN66271.pdf

I was looking for some info about the mn66271 Because I like to make a toslink out for my cd player.

I saw pin 6 does have tx out, I think this digital out, so I have been measuring this pin, but unfortunatly 0 volts. Not sure if I'm on the correct pad.
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Old 27th December 2014, 08:45 PM   #5
dacen is offline dacen  Norway
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From what I can see on the Data sheet, you are on the right pin ,Digital Out is pin 6. Have a look at pin 16 which is a control input pin called DMUTE. I would not be surprised if this is a Digital Out Mute control pin. Data sheet says muted if logic high. Good luck
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File Type: pdf mn66271.pdf (74.7 KB, 12 views)
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Old 27th December 2014, 10:31 PM   #6
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Thanks
https://www.scribd.com/doc/250200725/ALpine-cha-1214
This is the service manual of the cd changer where its for, please see page 29 of pdf. Here you see ic 101, with pin 16 dmute.

Do you think I can interrupt this connection without making damage? Or lets say can I try that to see if it works out?
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Old 27th December 2014, 11:42 PM   #7
dacen is offline dacen  Norway
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From what I can see on the schematic these signals AMUTE and DMUTE (analog and digital mute) are coming from pin 32 and pin 33 on IC 501. If you trace the track on the board you should be able to see if pin 32 (output) on IC501 is the only connection. If that is the case you should be able to cut the track and pull the input signal (pin 16)to logic ground . If that does not do the trick, just solder back the connection.

Last edited by dacen; 27th December 2014 at 11:51 PM.
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Old 28th December 2014, 12:32 AM   #8
dacen is offline dacen  Norway
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Just a warning! Do not pull the signal low before the output signal from IC 501 is removed by cutting the track! Otherwise you will most likely damage the IC.
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Old 28th December 2014, 03:12 AM   #9
dacen is offline dacen  Norway
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Never mind my earlier posts. On the right side of page 30 in the schematics there are tables telling us the logic status on the pins when power is on. It says 0 volt on pin 16. That means not muted. So the problem has to be elsewhere. By the way, with what kind of instrument are you doing the measurements ?

Last edited by dacen; 28th December 2014 at 03:17 AM.
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Old 28th December 2014, 12:16 PM   #10
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Thanks for looking, its fun to find out..:-)

Pin6 the multimeter voltmeter is saying 0,08 volt, and my very old scope is telling the same I think, but its kind of blurry to tell exactly.

Allready made a connection on pin 6, with a toslink (http://www.farnell.com/cad/1708371.pdf), so ready to play. Only needs to be activated I guess.

I have been looking into a another service manual of an other type cd changer, here they use nearly the same ic101 for the same purpose, but this one does have toslink out and also using pin 6. So maybe this manual is nice to do crosscheck, maybe you see here the answer? please see page 22 ic101 https://www.scribd.com/doc/251045332...service-manual

I hope you see the answer?
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