CDM4/19 two types of cog-wheel - diyAudio
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Old 14th January 2013, 12:17 PM   #1
fonon is offline fonon  Poland
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Default CDM4/19 two types of cog-wheel

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.
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Old 15th January 2013, 08:22 AM   #2
UV101 is offline UV101  England
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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.
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Old 15th January 2013, 07:00 PM   #3
UV101 is offline UV101  England
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Is the 1st picture a cdm9???
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Old 16th January 2013, 08:09 PM   #4
fonon is offline fonon  Poland
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Quote:
Originally Posted by UV101 View Post
Is the 1st picture a cdm9???
No, it isn't.
Regards,
f.
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Old 17th January 2013, 12:14 PM   #5
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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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Old 17th January 2013, 12:25 PM   #6
fonon is offline fonon  Poland
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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.
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Old 17th January 2013, 11:37 PM   #7
UV101 is offline UV101  England
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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.
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Old 18th January 2013, 07:51 AM   #8
fonon is offline fonon  Poland
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Originally Posted by UV101 View Post
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.
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Old 18th January 2013, 08:03 AM   #9
UV101 is offline UV101  England
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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!!
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Old 18th January 2013, 09:48 AM   #10
fonon is offline fonon  Poland
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Originally Posted by UV101 View Post
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.

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Does it really matter?
The both types of cog-wheels aren't interchangeable.
f.
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