Philips cd160 CDM2 replacement to CDM1

orsmate · 31st January 2013, 10:06 AM

Hi!

I've been reading diyaudio.com for a while silently tweaking and sometimes destroying stuff... that's just how it goes.

Have made some modifications to my Philips CD 160, and I decided to replace the whole CDM2 to a CDM1 that I have off the shelf. Has anyone tried something like this? I've realized that a big difference between CDM2 and CDM1 is that CDM2 outputs a so called HFD (High Frequency Detector) signal almost straight to SAA7210 while CDM1 does not do this... other that this they do seem to be compatible.

Have checked in the Philips CD304-MKII schematic that there is a HF detection circuit for the purpose, and I wonder if anyone has an idea of a simpler replacement of the circuit.

Can anyone tell me what might be the result of leaving this input floating and connecting the CDM1?

Thanks a lot in advance!

Cheers!

oshifis · 31st January 2013, 02:25 PM

Hi Máté,

The SAA7210 data sheet says pin 26 HIGH enables the detector, and it has an internal pull-up resistor. So you can leave it open. Are you sure the servo part of CDM-1 and CDM-2 are compatible?

orsmate · 31st January 2013, 02:45 PM

Hi!

I do hope it is compatible. It shouldn't do any damage, should it?

Üdv

31st January 2013, 10:06 AM	#1
orsmate diyAudio Member Join Date: Apr 2011	Philips cd160 CDM2 replacement to CDM1 Hi! I've been reading diyaudio.com for a while silently tweaking and sometimes destroying stuff... that's just how it goes. Have made some modifications to my Philips CD 160, and I decided to replace the whole CDM2 to a CDM1 that I have off the shelf. Has anyone tried something like this? I've realized that a big difference between CDM2 and CDM1 is that CDM2 outputs a so called HFD (High Frequency Detector) signal almost straight to SAA7210 while CDM1 does not do this... other that this they do seem to be compatible. Have checked in the Philips CD304-MKII schematic that there is a HF detection circuit for the purpose, and I wonder if anyone has an idea of a simpler replacement of the circuit. Can anyone tell me what might be the result of leaving this input floating and connecting the CDM1? Thanks a lot in advance! Cheers!

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31st January 2013, 02:25 PM	#2
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	Hi Máté, The SAA7210 data sheet says pin 26 HIGH enables the detector, and it has an internal pull-up resistor. So you can leave it open. Are you sure the servo part of CDM-1 and CDM-2 are compatible?

31st January 2013, 02:45 PM	#3
orsmate diyAudio Member Join Date: Apr 2011	Hi! I do hope it is compatible. It shouldn't do any damage, should it? Üdv