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General information

 

Job Number

 

0102-20

 

 

 

 

Equipment type

 

Cassette recorder deck

 

 

 

Maker + Model #

 

Yamaha K-90

 

 

 

Made in

 

Japan

 

 

 

 

Comments

 

 

 

 

 

 Symptoms observed

 

BAD

1

No play, rew, ff function

 

 

 

 

2

Counter non functional

 

 

 

 

 

 

GOOD

1

Powers up and good display lumination

 

 

 

 

2

Motor is heard to be rotating

 

 

 

 

 

  Repair notes

 

Full repair description and observations

 

1

On opening up, it was immediately noted that the main Belt was melted around the motor pulley.

 

 

2

Using many swabs and acetone, the melted rubber was removed and the pulley was cleaned up.

 

 

3

Two other small rubber rings seemed to be loose and were replaced. One was responsible for the counter. On putting  the good belts, the cassette player functioned perfectly

 

Repair summary

MELTED / LOOSE RINGS AND BELTS

 

 

Precautions, fouls and advises

 

1

Since the belt was melted, its size was not known. A piece of string was used around the pulley and assumed path of the belt and from the length (circumference) the diameter was calculated. However this would not be the right size, and it is advised that the a smaller size is bought because one should bear in mind that the belt should be tightly placed in. Preferably two sizes are bought to avoid going back to the shop if the chosen size was slightly big or small!

 

 

2

ACETONE WAS AN EXCELLENT SOLVENT FOR RUBBER AND PLASTICS

 

 

 




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