Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank´s for your help, I already recived these manual from you
Text excerpt from page 6 (click to view)
ENGLISH
CONNECTING TO A LISTENING DEVICE
1. Turn down the volume of your listening device. 2. Connect the 3.5 mm (1/8-inch) plug into the earphone output jack. 3. Insert earphones into your ears (see previous page). 4. Slowly raise the volume to a comfortable listening level. WARNING: Always turn the volume down before plugging the earphones into a sound source.
SLEEVE VARIETIES
Foam Sleeves. These disposable foam sleeves compress to fit in the ear canal. Once in the ear, the foam expands to form a tight seal. Once tightly sealed, the sleeves hold the earphones firmly in place. The E1c and E5C come with yellow foam sleeves. The E2c earphones come with three sizes of orange foam sleeves to choose from �small, medium or large �for the best fit. Flex Sleeves. These reusable sleeves, made of a pliable plastic, fit comfortably in the ear and allow for ease of insertion. Choose from 3 sizes � small, medium or large �for the best fit. These should be cleaned regularly, using alcohol wipes or an antiseptic. Triple-Flange Sleeves (optional accessory for E1c and E5c only). These reusable sleeves form a tighter seal than flex sleeves while holding the earphones firmly in place. These should be cleaned regularly, using alcohol wipes or an antiseptic.
CHANGING SLEEVES
The sleeves at the end of the earphones can be replaced by sliding them off and on, as in the following illustration. A combination of twisting and pulling is recommended for sleeve removal.
