Marantz CD73 service manual.

[mschwilson]

Hi.
I have done the searches (including the net) and cannot find anyone with a service manual for a CD73.
Does anyone have a service manual.
Thank's.

[malay]

Vintage Audio Laser - Schémas techniques / Schematics-
If there are problems, can send on e-mail.

[mschwilson]

Many thank's for the link, you are a saint.
I tried all over the place to get info, but all I got was a few bits/extracts, mainly in German or similar.Cheers.
I managed to get most of the info off the site, and have sorted most of the problems.
One thing I can't do though, is trace why the output is sooo quiet, and a little distorted.
If anyone has had a similar problem, or maybe just has an idea of where I should look, then I would welcome the advice.
Would the TDA1540d chips be at fault?
It would be a shame to relegate this machine to the "spares or repair" bin.
Cheers.

[malay]

On health! You have the remarkable device! TDA1540D Is fine and best chip!!!
All its problems is a bad contact and old condensers with which it is necessary to replace.

And if you use tube SE the amplifier, make remove filter SAA7030(NOS) and reclocked with a good food, I/U on the resistor and the transformer instead of all analogue (opamp) I/V buffered.
Good luck!
Excuse, for my bad English.

[mschwilson]

Thank's again.
I'll re-seat the chips and check the circuit for faulty components like you suggest.
I don't think I have the skills to re-clock the unit, and to be honest, all I want to do is actually get it to work.
It was in bits when I got it, and I paid over £100.00 GBP for it, which has not gone down well with my fiancee, so just to get it to play would be enough to justify the price.
Anyway, I'll have a go and let you know.
Cheers for now.

[mschwilson]

Hi again.
I've just had a look at the decoder board and it has completely different chips to the ones listed in the circiut diagram.
As my knowledge of electronics is limited to descreet devices, I have no idea what to make of it all.
I have attached a picture of the board, and here is a list of the chips that are on the diagram;

SAA7030
TDA1540 (X2)
SAA7010
SAA7020
MAB8410 (I think this one is correct)
SAA7000

Apart from the MAB chip, the others appear to be completely different.


Any idea's?

[malay]

Originally Posted by mschwilson

Hi again.
I've just had a look at the decoder board and it has completely different chips to the ones listed in the circiut diagram.
As my knowledge of electronics is limited to descreet devices, I have no idea what to make of it all.
I have attached a picture of the board, and here is a list of the chips that are on the diagram;

SAA7030
TDA1540 (X2)
SAA7010
SAA7020
MAB8410 (I think this one is correct)
SAA7000

Apart from the MAB chip, the others appear to be completely different.


Any idea's?

Greetings!

It is normal, Philips 300\303 and Marantz 73 have two variants of execution, with the decoder from Philips with a set 7000/7010/7020 and executed on a separate payment with chips Sony, (the second variant more musical). Probably you have a scheme 2 variants? I can send you on e-mail service a manual of 1 variant.
To begin with it is necessary to check up pressure on a food payment.
Good luck!

[mschwilson]

Hi.
I would very much appreciate your variant 1 manual.
My email is;

mschwilson@aol.com

Thank's also for the power diagram, It's much easier to understand than off my manual.
I checked most of the components on this board already, but I'll do it again just to make sure.
As a matter of interest, none of the components are marked on the board, would the manual include a layout of the circuits? not to worry if not.
Thank's again for your help.
Cheers for now.

[poynton]

You just have an old version of the board with the "MK1" chips (pre-production numbers)


Andy



.

[poynton]

As far as the quiet output is concerned, is it one channel or both??

It could be that the muting relays are not working on "PLAY".



Andy


.