Hello everybody.
After successfully restoring a Superscope CD-330 a few months ago, I've bought another Marantz from the same series, apparently in very good conditions, this time a C-205. The eBay seller said "probably needing new belts". When I received it I made a quick test test, I could hear/feel the motor running but nothing moved, and when I opened it I found the two main belts, the ones on the underside of the mechanics, reduced to a black goo. I ordered a replacement set and while waiting for the new belts I completely cleaned the recorder on the inside and on the outside.
The Superscope C-205 is a mono recorder with adjustable playback speed based on the same chassis of CD-330 and CD-320. Being mono, the inside is a little less crowded and messy than the CD-330, but they look very similar. I cleaned all the tape transport parts and all the selectors and potentiometers.
I received the new belts today. After changing them I tested the recorder but the motor wasn't spinning anymore, so I unscrewed the mechanics and inspected it once again. Everything seemed fine, no missing parts or orphaned wires, so I pressed play once again and the motor started to spin again. It works, but I noticed some hard wow and flutter and that the motor isn't running at the correct speed: I had to move the speed regulation potentiometer to about +15% to actually have the tape playing at normal speed.
I noticed some problems with the rewind too, as when I engage it I can hear the motor spinning but the tape isn't moving, and goes to auto stop within few seconds, but I will investigate that later.
With more tests, I discovered that the motor not always works when requested, but it does if I gently start the spinning of the motor pulley with my hand.
So my first guess is: the motor is defective and needs replacement. Do you agree? Or should I look for other problems?
The problem is: what motor is that? The label on that gives only the Marantz product part code (MM10600520), it says it's a 6V Matsushita motor produced in 1980 but nothing more than that. I made a quick web search but I couldn't find more detailed info. As far as I can see, only two wires go inside the motor (well, actually it's just a single shielded wire with + on the inner conductor and - on the shield mesh), and looks very similar the motor used on CD-330, but the service manual say it's a 2200 rpm motor, while the CD-330 one is a 2400 rpm one. I can find a replacement for the 2400 rpm motor but I can't find any for this one.
Do you have any suggestion?
Thank you in advance,
Lorenzo
After successfully restoring a Superscope CD-330 a few months ago, I've bought another Marantz from the same series, apparently in very good conditions, this time a C-205. The eBay seller said "probably needing new belts". When I received it I made a quick test test, I could hear/feel the motor running but nothing moved, and when I opened it I found the two main belts, the ones on the underside of the mechanics, reduced to a black goo. I ordered a replacement set and while waiting for the new belts I completely cleaned the recorder on the inside and on the outside.
The Superscope C-205 is a mono recorder with adjustable playback speed based on the same chassis of CD-330 and CD-320. Being mono, the inside is a little less crowded and messy than the CD-330, but they look very similar. I cleaned all the tape transport parts and all the selectors and potentiometers.
I received the new belts today. After changing them I tested the recorder but the motor wasn't spinning anymore, so I unscrewed the mechanics and inspected it once again. Everything seemed fine, no missing parts or orphaned wires, so I pressed play once again and the motor started to spin again. It works, but I noticed some hard wow and flutter and that the motor isn't running at the correct speed: I had to move the speed regulation potentiometer to about +15% to actually have the tape playing at normal speed.
I noticed some problems with the rewind too, as when I engage it I can hear the motor spinning but the tape isn't moving, and goes to auto stop within few seconds, but I will investigate that later.
With more tests, I discovered that the motor not always works when requested, but it does if I gently start the spinning of the motor pulley with my hand.
So my first guess is: the motor is defective and needs replacement. Do you agree? Or should I look for other problems?
The problem is: what motor is that? The label on that gives only the Marantz product part code (MM10600520), it says it's a 6V Matsushita motor produced in 1980 but nothing more than that. I made a quick web search but I couldn't find more detailed info. As far as I can see, only two wires go inside the motor (well, actually it's just a single shielded wire with + on the inner conductor and - on the shield mesh), and looks very similar the motor used on CD-330, but the service manual say it's a 2200 rpm motor, while the CD-330 one is a 2400 rpm one. I can find a replacement for the 2400 rpm motor but I can't find any for this one.
Do you have any suggestion?
Thank you in advance,
Lorenzo