E) Lamp Dimming - Kodak EKTAPRO 4020 Service Manual

SM 2547-1 Service Manual

e) Lamp Dimming

The LAMP DIMMING FUNCTION is installed in Model 4020 - 9020. It is used for dissolving for Economy and
Standard LAMP settings. The main devices for dimming are the TRIAC, TRIAC CONTROL and Zero_Cross
circuit on the POWER REGULATION PCB, the dissolve logic and the MICROCONTROLLER (MC) on the
MASTER PCB.
The TRIAC FUNCTION is controlled by the MICROCONTROLLER and its software, it works according to phase
cut principals.
figure 3-10
Kodak AG, Stuttgart 3-13 03/98