cdm1or cdm0?

[pengxy]

Anybody knows this is cdm1 or cdm0? I need this cd transport adjsutment procedure and schematics of marantz cd73.
thans

 

[TDA1540]

Pengxy,

this is pre-cdm1.
what do you want to adjust?

 

[guido]

The head looks like a 1, but i dont recognise the pcb and the spindle motor. Could be a 0, never seen one in real live.

As far as i know the 0 has a flat surface on the top side, while the 1 has not. Turn it around please

Regards,

Oops, somebody beat me to it.
Tried to attach a cdm1, but if failed

 

[jean-paul]

It looks only partly like a CDM 0 to me. CDM 0 has a diecast base ( mine had anyway ) and weighs a ton. The spindle arm has resemblance, please turn it over for further inspection.

I have the idea this is one of the first Sony mechanics made in colaboration with Philips, the PCB looks like it is built by Sony.

 

[TDA1540]

Sony?

AFAIK this is a regular early Philips CDM.There exist quit a few different support PCBs.All RAFOCs from the first generations(nameless,cdm0,cdm1) are identical afaik.


pengxy:the identificationsticker is located on the black plastic panel.

 

[pengxy]

In service mode my marantz cd73 has laser out and spining with some noise untile stop button pressed. In normal mode it has no laser out and spining. I don't have much exprience with cd transort if anyone can help me to make sure the laser part has end of its life or not .If it is ok any adjustment for three pots :
47k focous offset
2k2 focous gain
6k8 lsaer output.
Because I don't have the schematics of this player the problems my not be the transport. Any suggustion will be appriciated.

I found the idetification of the tag :HA 003A6 CDM
Thans everyone!

 

[Bernhard]

This must be CDM0, it has brush motor like CDM4 and is found in CD303 and similar Grundig CD7500.

 

[TDA1540]

no use adjusting the trimpots.

besides a dead laser there are more possible problems generating this behaviour.None of them are solved by messing with the pots.

 

[pengxy]

In the marantz cd73 there are some chips I don't know what for
mab840
mab441
cx7933
cx7934
cx7935
tmm2016
saa7011 =saa7010?
Any one can help me ?

 

[TDA1540]

All RAFOCs from the first generations(nameless,cdm0,cdm1) are identical afaik.

This is not correct.Sorry.



cx7933
cx7934
cx7935

cx7934 performs errorcorrection.cx7933 controls the 7934.cx7935 converts the format.

 

[pengxy]

thanks a lot !

 

[pengxy]

tda1540,

Do you have the datasheet of cx7933.cx7934,cx7935?

pengxy

 

[TDA1540]

Do you have the datasheet of cx7933.cx7934,cx7935?

no, found the info in a servicemanual.

BTW early sonyplayers use the same chips(101/501/701)

 

[tiefbassuebertr]

This thread could be also of interest in this case:
http://www.diyaudio.com/forums/showthread.php?t=40682