cdm1or cdm0?

pengxy · 20th July 2004, 05:59 AM

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

TDA1540 · 20th July 2004, 09:06 PM

Pengxy,

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

guido · 20th July 2004, 09:11 PM

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 · 21st July 2004, 05:15 AM

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 · 21st July 2004, 01:12 PM

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 · 21st July 2004, 03:10 PM

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 · 22nd July 2004, 07:03 PM

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

TDA1540 · 22nd July 2004, 10:02 PM

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 · 24th July 2004, 08:45 AM

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 · 15th August 2004, 04:21 PM

Quote:

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.

20th July 2004, 09:11 PM	#3
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	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 __________________ GuidoB

21st July 2004, 05:15 AM	#4
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: Germany	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. __________________ It's only audio

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20th July 2004, 09:06 PM	#2
TDA1540 diyAudio Member Join Date: Feb 2004 Location: Ehv	Pengxy, this is pre-cdm1. what do you want to adjust?

21st July 2004, 01:12 PM	#5
TDA1540 diyAudio Member Join Date: Feb 2004 Location: Ehv	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.

22nd July 2004, 07:03 PM	#7
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	This must be CDM0, it has brush motor like CDM4 and is found in CD303 and similar Grundig CD7500.

22nd July 2004, 10:02 PM	#8
TDA1540 diyAudio Member Join Date: Feb 2004 Location: Ehv	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.

24th July 2004, 08:45 AM	#9
pengxy diyAudio Member Join Date: Feb 2004 Location: shanghai	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 ?