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Old 16th December 2006, 02:58 PM   #1
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Question Proceed PCD2

I got a Proceed PCD2 in mint condition. After I checked it plays well I could not resist taking the cover off. I love the built quality.
Now I am puzzled as I see two digital filters: SAA7220 and NPC5813 and also a digital input receiver chip YM3623. What is that one doing in an integrated CD-player?
The clock seems to be very cheap standard affair with the SAA7220.
Dispite that the sound is rather nice but bass is weak.
There are two DAC PCM58 and apparently AD845JN as IV-converter plus another one and LT1010 buffers.
Anyone can help me with this puzzle?
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Old 20th December 2006, 09:14 AM   #2
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Lightbulb Proceed PCD2 Internals

Found this:
http://db.audioasylum.com/cgi/m.mpl?...d2&r=&session=

Click the image to open in full size.
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Old 11th February 2008, 02:29 PM   #3
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Caro Qserra,

Como correu a sua intervenção no Proceed? Estou a pensar adquirir um usado.

Cumprimentos,
Ricardo
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Old 19th March 2009, 09:06 AM   #4
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Player works AOK, found schematics!
Sorry I don't speak Portugese.
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Old 27th April 2009, 02:12 PM   #5
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Default Schematics for Proceed pcd2

I have one of these units myself and am looking for a schematic to assist in modifying it.

Is this schematic something you might be willing and able to forward to me?

I have received absolutly no response from Harmon international.

Thanks regardless,
Gary
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Old 28th July 2009, 11:33 AM   #6
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Location: Greenville, SC
Default Proceed PCD/PDT 2 Schematic

Hello, I am servicing a PDT 2 for a friend. Do you have a copy of the schematic? The unit seems to have a power supply problem.

Thanks
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Old 29th July 2009, 12:36 PM   #7
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Hello Quirck,
Thank you so much for the offer. I used to be service manager at a Levinson/Proceed dealer but since Harmon took over they will only work with their two service centers. I dove into the unit last night and confirmed my suspicions that the primary on the toroid power transformer is shorted. Sad! I also found a shorted bridge rectifier bypass capacitor. I bet someone replaced the rear panel fuse with a larger value and the shorted capacitor took out the transformer. I'm going to sniff around for the Holden & Fisher D1263A transformer. I may need the schematic for the voltages of the transformer windings.

Thanks again,
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Old 29th July 2009, 05:53 PM   #8
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Default Re: Proceed PCD2

Quote:
Originally posted by QSerraTico_Tico
I got a Proceed PCD2 in mint condition. After I checked it plays well I could not resist taking the cover off. I love the built quality.
Now I am puzzled as I see two digital filters: SAA7220 and NPC5813 and also a digital input receiver chip YM3623. What is that one doing in an integrated CD-player?
The clock seems to be very cheap standard affair with the SAA7220.
Dispite that the sound is rather nice but bass is weak.
There are two DAC PCM58 and apparently AD845JN as IV-converter plus another one and LT1010 buffers.
Anyone can help me with this puzzle?
Exactly this model comes to me for service for some months. Proceed don't release schematics, therefore I have created this one in "circuitmaker". because I have some macros of cd specific ICs, it was not extrem complicated.
For me it was surprising that in an integrated CD player was built in a completely independent DA converter - that's the reason for this "puzzle". Very effective to fundamental enhance the sonic quality is a precision oscillator (jitter reduction), boosting S/PDIF out as well as MOSFET I/U converter of the Nelson Pass "D1"
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Old 18th November 2009, 07:10 AM   #9
elcid is offline elcid  Italy
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Hi, can You tell where I may find schematics for this player?
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Old 12th January 2010, 07:29 AM   #10
elcid is offline elcid  Italy
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Hi,
still need schematics?
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