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Old 31st July 2008, 06:26 AM   #1
billbo is offline billbo  Australia
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Join Date: Nov 2006
Location: Sydney
Unhappy saa7030 removal help

Sorry guys to bring this old post up again.

As discussed :

to rfbrw:
Hi, I tried removing the saa7030 in my Marantz cd-54 and just connect the following with wire.
Pin20 DLCF to Pin3 DLFD.
Pin17 DRCF to Pin10 DRFD.
Pin18 /CLCF to Pin6 /CLFD.
Pin21 STR1 to Pin7 LAT.

Now there is a problem here on the last wire connection. Pin 7 goes nowhere on the saa7030 in this unit. It is not soldered. So I connected the first three only. The removal of the saa7030 did not work. The sound was very distorted and unbearable. Something was wrong. (I placed the saa7000 in 16 bit mode also. +5v via 1k to pin 16).
pin 21 on the saa7030 is only strobed by the saa7000 and pin 7 is open circuit. I looked at the circuit diagram for the cd-54 and found that the LE lead(pin 2 of the tda1540) is directly connected to the saa7000 pin11 (which is the LAT output). This mod did not work for me. Can someone tell me what I did wrong?
I would very much appreciate it.
Regards
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Old 31st July 2008, 03:25 PM   #2
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Interesting that you are mentioning this today, as I am about to do the same thing on my Philips CD104.

I found the following instruction:

- remove TDA7030 completely - in place of TDA7030 connect four wire bridges:
pin 20 - pin 3
pin 17 - pin 10
pin 18 - pin 6
pin 21 - pin 7
- de-solder only pin 16 on SAA7000 with a solder wick and make sure pin 16 "floats", it does not make any contact the circuit board. (or simply cut the trace) - solder a 1K resistor on top of SAA7000, between pin 16 and pin 18 (to put SAA7000 in 14 bit mode, because TDA1540 needs 14 bit)


I am too much of a newbie to know what's happening, but it sounds easy enough.

Greetings from sunny Germany,
Wolfram
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Old 31st July 2008, 03:37 PM   #3
billbo is offline billbo  Australia
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is the pin 7 on the saa7030 soldered in the Philips? If so where is it connected to.
Regards
Billy D...
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Old 31st July 2008, 03:54 PM   #4
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If I am not totally blind: pin 7 SAA7030 goes to PIN2 of the TDA1540P's.

Greetings from sunny Germany,
Wolfram

P.S. PINs 8/9 are unconnected.
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Old 31st July 2008, 04:09 PM   #5
billbo is offline billbo  Australia
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mmm. Interesting. My Marantz pin 2 of the tda1540's bypasses the saa7030 and is connected straight to pin 11 of the saa7000. I will double check this.
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Old 31st July 2008, 04:21 PM   #6
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Interesting indeed - but then I am really new to all this, so hopefully somebody with more experience will chime in - plus the two circuits might be different (?)

Greetings from sunny Germany,
Wolfram

P.S. my 'instruction' was posted especially regarding the CD104.
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Old 31st July 2008, 07:45 PM   #7
billbo is offline billbo  Australia
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Default all fixed

For anyone who wants to do this modification on a Marantz cd-54 the following proceedure needs to be done.

Pin20 DLCF to Pin3 DLFD.
Pin17 DRCF to Pin10 DRFD.
Pin18 /CLCF to Pin6 /CLFD.
pin16 to +5v via 1K resistor.

The connections above are all ok. As mentioned before the dacs are strobed directly from the saa7000 on pin11 (str2). This needs to be cut and rerouted to pin12 (str1). Pin12 of the saa7000 does actually connect to pin 21 of the saa7030 but the output (pin 7) is not connected to anything.

The above mentioned is the only difference in this model. Maybe other models might be the same.
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Old 31st July 2008, 11:07 PM   #8
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And if you own a CD104 the above mentioned 'instructions' work just fine - so a short summary of how to do things in those two players .

Greetings from Germany,
Wolfram
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Old 1st August 2008, 06:06 PM   #9
oshifis is offline oshifis  Hungary
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This is my solution (in a Marantz CD-74/84) with a simple reclocking added:

http://tube.fw.hu/no_oversampling.pdf
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Old 7th August 2008, 12:52 PM   #10
billbo is offline billbo  Australia
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Default reclocking cct

Hi Oshifis..
I am interested in putting thr reclocking cct. where the saa7030 was. What will I benefit from this? Will it maintain better stability?
I have isolated the +5v rails between the saa7000 and the two dacs. If I was to implement this cct. Which +5v line should I use? (My oppinion is to use the saa7000 +5v Supply since the Xtal is on this supply aswell).
Please let me know.
Regards
Billy D...
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