Marantz CD63 & CD67 mods list

[disco]

Originally posted by avr300
Yes, have seen it, but I just don't get why it won't run without the components leading to pin14 which is output

1M + C523 to gnd - then it's happy. Not else.

Well never mind.

Termination?

[imperfectcircle]

Ok I checked some more stuff and found a few bad solder joints and fixed them, now its no longer blowing fuses but i still have the problem with the laser and the disk spinning fast, any ideas on this?? Its driving me nuts! I get error clode 12. Now ive replaced the servo chip and all three opamps in the servo section. I donno what it could be. Simon didnt yyou have a similar problem at one point???
thanks

[avr300]

Originally posted by disco


Termination?

Then it should be the RC, 1M + C523 to gnd that performs somekind of termination of the outpus aswell as pin13 - well it surely does.

But I rather leave it by itself than polluting my clock with the "input+output whatever the signals sums to" from the decoder onto my fine Tentclock It's playing now and it will for the next - hmm, day?

[disco]

Originally posted by imperfectcircle
Thanks Disco for the tip. Im going to start with the servo section since thats where the short happened. Im just hoping it something simple. I already treid replacing the 3 opamps and servo chip from an extra board I had, and it does the same thing. So I guess Ill have to start removing the resistors one a t a time to find where the problem is.

Before it started blowing fuses i got erro message 12 which is a sled error any ideas what would cause this?? I treid a differant transport and got the same result.
thanks
Frank

You're welcome Frank.

The sled status is tested by the microprocessor (MN187164). A problem is reported by this IC.

Pin 24 of Servo IC (TDA1301T) carries the Sled Output and goes to Q105 (TCA0372, Sled Motor).

Because you exchanged the transport which carries the sled motor, it's likely Q105 is blown. I'm no expert in digital repair, so it's only an educated guess.

Try replacing both R127 and R128 (4.7/0.25W). If no success try replacing C134, C135 and C138.

A couple of months ago Brent reported TCA0372 are hard to get. If you are lucky you might succeed repairing your own player... There might be more damage but it's always worth the try.

Regards, Jaap

[imperfectcircle]

Well my 5v feeds are all good. But i checked the voltages at the r127, r128 and they are weird!

heres what I got

r136 -8.3v
r127 -6.2
r128 +9.7


R128 is right its supposed to be +10, but r127 should be -10 and its only -6??

[disco]

Originally posted by imperfectcircle
Well my 5v feeds are all good. But i checked the voltages at the r127, r128 and they are weird!

heres what I got

r136 -8.3v
r127 -6.2
r128 +9.7


R128 is right its supposed to be +10, but r127 should be -10 and its only -6??

Pin 2 of Q105 should be +11.5V
Pin 9 to 16 of Q105 should be -12.1V
Please check the polarity of your caps!

[imperfectcircle]

I havent chaged any of those caps in the Servo section yet! But I know r127 is no good it should be -10v not -6v

[imperfectcircle]

pin 2 q105 -9.6
pin9-16 -11.6

something is wrong here

[imperfectcircle]

Im getting a negative voltage on resistor 127 which is supposed to be a +10v feed for q105.

[imperfectcircle]

Now im even more confused, on one side of r127 I get -10 but on the other side i get +10?? How is that posible for a resistor to change the voltage from + to _??