CDM4/19 two types of cog-wheel

fonon · 14th January 2013, 11:17 AM

Hi,
There are two kinds of cog-wheels in the CDM4/19 based drawer mechanisms (see the photos attached): full plastic, supported on both sides (the second photo) and plastic with the metal spindle, fixed on the one side (the first photo). I found the first type cog-wheel in Marantz CD-72 unit and the second type in many other Philips and Marantz units.
In what units are used the full-plastic cog-wheels? Is there a list?
f.

UV101 · 15th January 2013, 07:22 AM

It would be my guess that the dimensions are identical although this is only a guess. I've been through many cdm4/19 of the Philips and marantz variety and I've never noticed the metal spindle version. Maybe it was a late version revision?

The original brown wheels used in the majority of cdm4/19 mech go brittle and break as shown. I doubt the replacements now available on eBay will suffer the same fate as the material used to make is different.

UV101 · 15th January 2013, 06:00 PM

Is the 1st picture a cdm9???

fonon · 16th January 2013, 07:09 PM

Quote:

Originally Posted by UV101

Is the 1st picture a cdm9???

No, it isn't.
Regards,
f.

PlasticIsGood · 17th January 2013, 11:14 AM

Maybe it depends on where the machine was made? Much earlier, CDM1 machines made in Japan had completely different drive mechanism and motor. Moulds for the loader frame weren't cheap, so there must have been a good reason for variation. Either location or date, presumably.

fonon · 17th January 2013, 11:25 AM

Quote:

Originally Posted by PlasticIsGood

Maybe it depends on where the machine was made?

I have two units disassembled: Philips AK630 made in Portugal and Marantz CD-65II made in Belgium.
f.

UV101 · 17th January 2013, 10:37 PM

The exploded diagrams in both the cd72 and cd52 service manuals are identical but the part numbers are different. I know the 52 has the more common gear like in the 2nd picture as does the cd50. The 50 and 52 share the same part number.

fonon · 18th January 2013, 06:51 AM

Quote:

Originally Posted by UV101

The exploded diagrams in both the cd72 and cd52 service manuals are identical but the part numbers are different. I know the 52 has the more common gear like in the 2nd picture as does the cd50. The 50 and 52 share the same part number.

My CD72 has the full-plastic cog-wheel shown on the 2nd picture.
f.

UV101 · 18th January 2013, 07:03 AM

In your 1st post, you state that your cd72 has the metal spindle type??? Now I'm confused!

Does it really matter? All the full plastic originals fail but can be replaced with new plastic (different construction) ones from china. I doubt they will fail in the next 20 years but you could always keep a spare!!

fonon · 18th January 2013, 08:48 AM

Quote:

Originally Posted by UV101

In your 1st post, you state that your cd72 has the metal spindle type??? Now I'm confused!

No, I didn't. Unfortunately the photos were loaded in inverse order. The first type - the second photo, the second type - first photo.

Quote:

Originally Posted by UV101

Does it really matter?

The both types of cog-wheels aren't interchangeable.
f.

15th January 2013, 07:22 AM	#2
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	It would be my guess that the dimensions are identical although this is only a guess. I've been through many cdm4/19 of the Philips and marantz variety and I've never noticed the metal spindle version. Maybe it was a late version revision? The original brown wheels used in the majority of cdm4/19 mech go brittle and break as shown. I doubt the replacements now available on eBay will suffer the same fate as the material used to make is different. __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

15th January 2013, 06:00 PM	#3
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	Is the 1st picture a cdm9??? __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

17th January 2013, 10:37 PM	#7
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	The exploded diagrams in both the cd72 and cd52 service manuals are identical but the part numbers are different. I know the 52 has the more common gear like in the 2nd picture as does the cd50. The 50 and 52 share the same part number. __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

18th January 2013, 07:03 AM	#9
UV101 diyAudio Member Join Date: Dec 2008 Location: Oxford	In your 1st post, you state that your cd72 has the metal spindle type??? Now I'm confused! Does it really matter? All the full plastic originals fail but can be replaced with new plastic (different construction) ones from china. I doubt they will fail in the next 20 years but you could always keep a spare!! __________________ When Bitstream came out, I thought, “my God, what are we going to do...?” Ken Ishiwata http://www.hifisounds.co.uk JA-88D Class A, Audio Aero Capitole MKII, Focal and Kimber "Leave Nothing as Standard"

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17th January 2013, 11:14 AM	#5
PlasticIsGood diyAudio Member Join Date: Mar 2012 Location: Bradford	Maybe it depends on where the machine was made? Much earlier, CDM1 machines made in Japan had completely different drive mechanism and motor. Moulds for the loader frame weren't cheap, so there must have been a good reason for variation. Either location or date, presumably.

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