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Old 9th March 2004, 07:09 PM   #1
Gos is offline Gos  Bulgaria
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Location: Sofia
Default Philips CD670

Hi all,

I'm new to the forum so sorry if this same topic is already hidden in the archives - I searched, but couldn't find nothing for CD670, except this:
You know what, I have a "wrong" type in my collection. It is an old 1987 black CD670 with CDM2 mechanics. Laser is good and it is in good condition,
some small scratches. It has TDA1541 ( without A ) and SAA7220P/A. If you want it you can have it for shipping + packaging costs.
Send me a mail via the moderator if you want it. Could be a nice start in the DIY world. I am not saying that this is a perfect cdplayer but it has some qualities...
CD650 is the cheaper brother of CD670 AFAIK.

I bought Philips CD670 .
Inside the player:
Chipset SAA7210/7220/TDA1541,
Transport CDM2/10,
These two maybe for FTS function : MAB8441P/44166 ???,
Headphone amp JRC4560D,
I/Vstage and LPF stage : LM833N,
All regulators are 78xx and 79xx and there's one very strange 7906 (-6V).

Pro: it plays all (except for the ending too long disks- above 70min sometimes it skips or replay) , good DAC board, good sound quality for such a old and cheap machine.
Con: plastic case, slim size - not enought room for heavy mod's(separate PS), old version of the chipset.
Hard to perform the tweak - one half space(left) of the case sets CDM2 and transformer,the other half - above is the DAC board , and right under it is the set conroller PCB (and many cables and connectors between these pcb's),
next to this "sandwich" on the right side is set the PS board (for display).

After have read up some of thread's on the forum , I have idea how to implement these things:
I will disconnect muting transistors in the signal path,
To do a regulation on the positive and negative rails (+/-5 and -15) with TL431 shunt regs mounting closely possible to the DAC chip power legs,
Completely rebuilt the analog stage - swap the LM833 chips whit LM6172 - properly bypassing (same as DataSheet) ,
Cut out traces to these strange parts (maybe deemphasis) wired in parallel with feedback resistor an OP I/V converter stage. I'll leave only the feedback resistor(about 1.8kohm) with cap(about 2nF) to acts as 1st order LPF@44kHz .
Completely rebuilt the LPF stage(2rd order Bessel LPF@44Hz) - that would be enought (the player is ready) to simply try on TDA1541 in Non-os mode???

I would like to have the schematic for CD670, If you can , Please email it to me!
Or the schematic for cd650 or CD850 (or similar output stage, or similar PS model) ? After having a look at the otput stage schematic of Philips CD960 (finded it somewhere on the web), I can confirm that it's similar (analog out) as my Philips CD670.
Some of these schematics would be very useful.

Jean-paul and some of other experts - Would you help me please with some advice?

I apologize for my bad english.
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Old 3rd May 2007, 03:03 PM   #2
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Join Date: Aug 2006
I've got this player too.
It sounds very good.
I would like to receive schematics of Philips CD670.

Thanks in advance.
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Old 18th July 2009, 03:32 PM   #3
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Location: Nova Scotia
If I also add a request maybe others will and we may just get one, but my solution is to draw one, well at least the power supply section and DAC section because I am Lampizing mine....

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Old 19th July 2009, 07:00 AM   #4
amc184 is offline amc184  New Zealand
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Location: Christchurch
I've got the service manual for this player. PM me an email address capable of receiving an 8MB attachment.

It a nice player. I've got one in mint condition, but I haven't really done much to it yet. I replaced all of the electrolytic capacitors and analog stage opamps. I also replace the TDA1541A decoupling capacitors. I used 1210 SMD PPS film capacitors for this, as I heard that they are quite good, and they fit much more neatly than any leaded ones would.

Almost all modifications done to the CD650 can be done to this player. The CD670 is really more like a 'bug-fixed' CD650 than anything else, it has the same functions, but the design has been refined. No more triple stack control board, no more tacked on glue-logic panels. The CD660 is the same as the CD670, but lacks an IR receiver.

As for lampizating (I hope that is the correct term) the CD670, I doubt it will be easy. This player is already fairly crowded, the lampizator may need an external box.
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Old 20th July 2009, 02:29 AM   #5
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Location: Nova Scotia
I am greatfull to you, having a schematic that I can rely on is very convenient, because yes, there is no space what so ever but the plan is to remove the front panel and make a totally new case from wood and aluminum. I did this to an old JVC and was very successful, the best part is the plexy glass top, so I can see all the inner functions.

I have all the information and pictures on another forum...
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Old 20th July 2009, 03:14 AM   #6
amc184 is offline amc184  New Zealand
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Your email account bounced the service manual.

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