CD63 Problem. Need Help!

[binatang]

My Marantz CD63 crackles during play. Not constantly but every few minutes while playing a regular disc. The problem becomes more pronouced while playing CDRs.

The player but has been modified pretty heavily but this problem only recently cropped up. I changed to a new laser unit but the problem still persists. I'm not trained so I'm just taking stabs in the dark. I'm wondering whether some of the more experienced forumers can point me in the right direction. Symptoms are as follows:

1) Sharp but short crackle while playing a disc.
2) Intervals between crackling seems ramdom. Sometimes a few minutes ... somtimes a few seconds.
3) Problem exists with both analog & digital ouput. So I'm guessing the problem has nothing to do with the output stage.

Any ideas? Any help very much appreciated. Thanks

[Netlist]

Look for a SAA7220. If there is one, warm it up and cool it down.
Listen what happens. Replace if necessary
If there isn't, ignore my post.

/Hugo

[Richard C]

Does the player crackle when the case is tapped?

I have a CD67SE with similar sypmtoms and assume it needs a new laser but maybe something else?

[binatang]

Thanks for the replies.

There is a SAA chip but not sure whether its the SAA 7220. What does this chip do? Not sure on the warming up & coolling down bit as the player crackles from the onset of operation & continues even when warm.

It doesn't crackle when the case is tapped. I've already changed the laser ... so I think thats fine.

Does naybody know what the TDA1301T does ... it says servo. What does it actually do?

[ergo]

TDA1301T is a summing and buffering amplifier for laser signals. It would be good to change this also. I have had one case where it helped and it's not too expensive either.

Ergo

[Netlist]

Originally posted by binatang

There is a SAA chip but not sure whether its the SAA 7220. What does this chip do?

Just in case, here you'll find a datasheet:
http://katalogi.iele.polsl.gliwice.pl/en/

A broken SAA7220 typically generates the problem you describe.
There might be other offenders of course.

/Hugo

[binatang]

Thanks guys.

I've been trying hard to isolate the problem. Here a little more info. My troubled CD63 has big problems with CDRs ... it is constant & loud crackling all the way. However, I don't have this problem with another CD63 that I own.

Netlist:

The CD63 uses the SAA7345GP - Decoder & Filter. This chip is rather hard to find.

ergo:

I got some spare TDA1301T chips. I might want to try changing it out.

BTW guys how in the world do you desolder SMTs!

[tonitze]

You can get both tda1301t and saa7345gp at sim lim tower, I successful replaced both chips in my cd63 and 67. How I did it by cutting all the pin with sharp cutter first and and use soldering tip to remove the balance of the pin at the pcb and u are ready to solder new chips in. U can change the tda1301t first. Most likely.

Goodluck

[binatang]

tonitze:

Thanks. I got my TDA1301Ts from SLT but had no luck with the SAA7345GP. Which store did you get it from?

I hope sincerely hope I can salvage it cos I really sayang (love) the damn thing.

[tonitze]

At basement 1. The shop that do modification of ld player to play vcd and the one that sell kits for surveilance camera and so on. I forgot the unit no. near the exit to the rear of SLT. That shop do sell speaker comp. too. Oh ya..when cutting of pins try not not to lift the cutter or else the pcb track might damage. Cut one pin at a time.