Barco SLM R12 Plus Service Manual page 176

25. Light Output Sensor R763294
The microcontroller IC I1 execute a frequency measurement and will spread it out over a longer period.
On the basis of reference measurement, stored in de EEPROM IC2, the number of corresponding centrum-lumens are calculated.
174 R5976820 SLM R12+ PERFORMER 08/03/2005