Kodak 9020/CINE service manual Lamp Control, Dual Lamp Operation

SM 2547-1 Service Manual

LAMP Control

a) Dual LAMP Operation

All Models are equipped with a DUAL LAMP MODULE (Extra Bright).

The POWER REGULATION PCB on all Models contains a LAMP current circuit that can detect if the active LAMP is on, indicated by a LED on the BACK PANEL.

If a LAMP fails, the MICROCONTROLLER receives the LAMP_CURR signal from the POWER REGULATION PCB. It activates the MIRROR MOTOR and moves the MIRROR to the second LAMP position. Then the relay K1 is energized and second LAMP is energized. The MICROCONTROLLER also energizes the LED for the second LAMP. The LED’s are located on the BACK PANEL.

The Models 4020 - 9020 and 9020/CINE have a memory. This memory is storing the the current used lamp as long as the lamp is defective. That means the mirror of the DUAL LAMP MODULE do not change his position after a new lamp is inserted. This function can be disabled (see page 2-3).

The characteristic of the lamp curve is no longer generated by a PLL circuit on the MASTERBOARD. Up to now it is stored in the Software LAMP Control memory and the TRIAC will be triggered from the

MICROCONTROLLER.

91VAC	Zero-Cross	Zero_Cross
	Circuit
82VAC	Relay	Economy
	Driver
	Relay	Relay
	Driver			Micro Controller
L2	L1
	M MirrorMotor	Mirror
		Motor
		Driver
	Dual Lamp
	Modul
	Lamp	Lamp_curr
	Current	SOFTWARE TRIGGER		Software
				Lamp
			DATA	Control
		Dissolve
			SYNC
Lamp Current		Logic	GND
Detection and
Switch off
Power Regulation Board		Master Board
	figure 3-9

Kodak AG, Stuttgart 3-11 03/98