Marantz CD63 & CD67 mods list

[adfinni]

Originally posted by poynton


As the voltages are pretty much correct, I would suspect a short after the output of the second opamp to ground or a short to ground at the junction of R606/R608

Make up a temporary probe by connecting (soldering) a resistor of about 10Kohm to the tip of a phono lead. Play a disc and probe Pins 7, 1, 2/3 of the chip. see where the sound stops.

Cracking idea mate, il give it a go in the morning. Had too many drinks tonight as i got bored of fiddlign with electronics. lol






Loads !!!!!!!!!!! Just wait and see !!


Andy

PS. You did check that the balance control on your amp was in the centre not hard to the left ? [/QUOTE]

Haha one of my housemates actually suggested that. I never use that as my arcam is always set on 'direct' which has no control over the bass, treble and balance. it sounds far superior and eliminates the hiss.

[Fidelity Audio]

Originally posted by poynton

PS. You did check that the balance control on your amp was in the centre not hard to the left ?

LMAO

He did try the balance but it snapped off in his hand. hehe

Ad post a pic of top and bottom of pcb (opamp area lol)

Brent

[adfinni]

il try and get that sorted tomorrow. But my camera usb connection died before the summer so its hard to get pics off. Damn technology falls apart around me.

[Fidelity Audio]

Originally posted by adfinni
il try and get that sorted tomorrow. But my camera usb connection died before the summer so its hard to get pics off. Damn technology falls apart around me.

OMG dont touch anything LOL

Brent

[SimontY]

Originally posted by adfinni
my camera usb connection died before the summer so its hard to get pics off. Damn technology falls apart around me.

LMAO! And I thought nobody could be worse than me...

[ImSparticus]

Mayeb ADMIN needs to free up some bandwidth ready for all the posts surrounding Adfinnis amp hack in the morning to trace the cd signal

If you want some solder let me know, i have lots, my email was a bit further back, ill post some tomorow for you m8.

Carefully check the components you removed, make sure you didnt take anything out you shouldnt. I agree with whats been suggested, first check for all the daft stuff, like lifted solder pads, scratched o/c tracks, did u remove the op amps and fit sockets (i have good ones here for u) if you did, then try swapping the opamps to see if one has failed.

best of luck

[adfinni]

sorry for the quality, its a housemates digi cam and it has contracted bad aids.





There you go. Hope that'l keep you happy for a while. Im not sure if il be able to get any fixing done this weekend as i might be heading home from uni.

[adfinni]

Originally posted by ImSparticus
Mayeb ADMIN needs to free up some bandwidth ready for all the posts surrounding Adfinnis amp hack in the morning to trace the cd signal

If you want some solder let me know, i have lots, my email was a bit further back, ill post some tomorow for you m8.

Carefully check the components you removed, make sure you didnt take anything out you shouldnt. I agree with whats been suggested, first check for all the daft stuff, like lifted solder pads, scratched o/c tracks, did u remove the op amps and fit sockets (i have good ones here for u) if you did, then try swapping the opamps to see if one has failed.

best of luck

o christ forgot to email you earlier. Argh. cheers for the advice mate. Il try to remember to email you about the samples tomorrow.

I think the admins need a new website just for my destruction derby full of cd-63's. LOL

adam

[markk02474]

Has anyone cared to ask how the working channel sounds?

Seeing the fuse resistors R613-R616 still in place reminded me to pass along another off list change I made that violates the hazzard warnings. I replaced the two power supply fuses (and holders) with wire jumpers. I don't know if it sounds better here, but doing that usually improves other gear.

The LM4562 opamps continue to break in and sound better (go figure). The brashness has pretty much gone. If these things cost 10x what they do, they would still be a bargain! I would not have thought they could make such the difference they have.

[adfinni]

Originally posted by markk02474
Has anyone cared to ask how the working channel sounds?

Well it soudned noticably better to me. The bass was far more defined and less boomy, the midrange seemed to be.... just nicer sounding, and the high frequency's were less harsh.

I don't know if it sounds twice as good so it's worth teh loss of one channel altogether