Sunday, February 21, 2010

how i fixed the cd on mini stereo sony MHC-C50

Sony MHC-C50
After 15 years i received it, the cassette deck A stopped working and i had more and more trouble getting the 5 CD trays to load a cd and read it without giving it a kick on the side to load.

The big problem with those old machines that have a lot of mechanics is that the electric motors are linked with the gears with a rubber. The latter really suffering with time.

i had to completely dismantle the 50 or more screws to disassemble the rack containing the cd tray system.

In the middle:
the huge big terrific cause of the problem: the rubber which obviously slid and did not transfer the movement to the mechanism loading the cd on the laser trolley and rotation motor. I simply added a cheap rubber to it. It is a cheap solution and i have no idea how long the rubber "caoutchouc" is going to stay intact with the ozone in the air.
of course the location of the problem was hard to reach. i had to remove the cd rack and connectore and so on and it involved removing and replacing more than 50 screws.

the cassette deck A is more difficult to fix cause the rubber got itself wrapped on itself and got stuck. trying to rotate it i broke it. i did not fix it now cause the rubber is a special band.

the cd player works now :)

Tuesday, February 16, 2010

train modelling - HO scale- electrically controlled cabin doors (a new invention - Copyright mczouav)

i had an idea... accidentally, when i had the mechanical pieces of a "broken" machine in my hands. I always liked to have a look at mechanical pieces patially dismantled de visu because it is sometimes quite ingeniously designed. Suddenly BANG! light turned on. that was the beginning of several hours of "pure adaptative creativity" :)

Here is the final result.
Try to guess what is the mechanical part i used to command the motion of the doors of the steam engines models cabin (obvious even if you are not a geek... a clue? it used to read dvds).

The motor is linked to a 1/2 W resistor of 470 Ohm (+/-) and a stabilised 12VDC power source with a simple polarity inverter switch (with neutral position stable).
the connection to the doors is made by nylon fishing wire. Each door is pushed open by a pen spring. The spring was stuck into a piece of polypropylene or polystyrene pushing the spring into the plastic with a hot iron.

- rotating bridge with an engine house with moving parts video -

Homemade automagic electric door opening of model train anger - rotating bridge for model train in action with 4 steam engines moving. movement of the machines is not perfectly smooth because track were oxydated.