Kodak 700, 630, 500 service manual Media Feed and Take-Up System

NovaJet 500/630/700 Series Service Manual

Media Feed and Take-Up System

REFLECTOR SENSORS

REFLECTOR

THEORY OF OPERATION

Figure 2-4. Power Feed and Take-Up System.

The media feed and take-up system comprises of two optical sensors, two dc motors and a dryer assembly. See Figure 2-4. The NovaJet 750 uses a thermal drying system while all other models use a blower drying system as shown above.

Motors are used to advance the media feed roll and the media take-up roll dependant upon the signals they receive from the MPWA. The MPWA generates the control signals for the motors from the informa- tion it receives from the media feed and take-up sensors. The MPWA also controls the dryer assembly. It activates only the fans required to cover the width of the loaded media. The fan assembly also contains an interlock circuit.

The optical sensors are designed to inform the MPWA when there is not a proper amount of slack in the media by sensing the ‘curl’ of the media at the bottom of its loop. This method is used so that all approved forms of media (including transparent backlit media) is able to take advantage of the power feed and take-up system.

Theory of Operation 2-5