![](/images/new-backgrounds/1105106/105106103x1.webp)
Service Manual | SM |
AUTO FOCUS
The AUTO FOCUS feature is installed in the EKTAPRO Model 5020,9020 and 9020/CINE.
A “low” FOCUS EXT signal from the MICROCONTROLLER enables the AUTO FOCUS PCB while a “high” signal disables the AUTO FOCUS to ensure a sharpness correction for the projected slide. If a manual sharpness correction was necessary the AUTO FOCUS MOTOR moves back to its primary position after the next slide change. The AUTO FOCUS MOTOR is running until both receivers has the same light input. The FOCUS MOTOR stops at the time the light input on both Photo transistors is equal. The direction for the focus movement is defined by either receiver port 1 or port 2.
An electronic circuit will determine the operating voltage for the FOCUS MOTOR (running forwards or backwards) to ensure to have the same speed in both directions. This regulation is necessary because the LENS CARRIER is basic loaded with a spring in one direction.
To ensure that the AUTO FOCUS function works properly it is very important to use the same kind of slide frames. Mixing up glass slides with other slides will bring the projected image out of focus because there is only one reference point for the lens position to get a sharp and clear projected image on the screen.
If glassless slide frames are in use, it could be, that the borders of the projected image are out of focus. It depends on the
Slide
Prism
IR-
Trnasmitter
| Prism |
|
|
| Focus Command |
|
| from Keyboard or |
| IR- | Remote Control |
|
| |
| Receiver |
|
T1 | T2 | MASTER |
|
| |
|
| BOARD |
AF | 5V DC |
|
BOARD | GND |
|
|
| |
| Foc Ext2 |
|
FOCUS | Foc Ext1 | MICRO |
LOGIC | Speed | CONTROLLER |
| Direction |
|
Focus Motor |
| |
M |
| FOCUS |
| MOTOR | |
| CONTROL | |
|
| |
figure |
|
03/98 | Kodak AG, Stuttgart |