Micro controller – Kodak Ektapro Slide Projector 4020 User Manual
Page 49
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.
Zero-Cross
Circuit
M
Mirror
Motor
Dissolve
Logic
Relay
Mirror
Motor
Driver
Micro
Controller
Master Board
Dual Lamp
Modul
Power Regulation Board
91VAC
Lamp Current
Detection and
Switch off
Relay
Driver
L1
L2
Zero_Cross
DATA
SYNC
Lamp_curr
Lamp
Current
Relay
Driver
Economy
82VAC
Software
Lamp
Control
SOFTWARE TRIGGER
GND
figure 3-10
SM 2547-1
Service Manual
Kodak AG, Stuttgart
3-13
03/98