Luminance Sensor Adjustment - Sony VPL-F635HZ Service Manual

2-4-7. Luminance Sensor Adjustment

1. Write down the value (114) of ROB_BRT_SENS_DAC_VAL that was set in step 1 in Section 2-4-5
and the value of laser power.
Consider these values as "ROBmax" and "P_ROBmax" respectively.
2. Write down the value (114) of Ruby_BRT_SENS_DAC_VAL that was set in step 3 in Section 2-4-5
and the value of laser power.
Consider these values as "RUBmax" and "P_RUBmax" respectively.
3. Lower LAMP_MAX_DUTY by 30.
Wait until the laser power value becomes stable. (Approx. 10 minutes)
4. Change the value of ROB_BRT_SENS_DAC_VAL, and write down the value just before the value of
SENSOR_OUT_I is changed "0" → "1" and the laser power value.
Here, these values are called "ROB30" and "P_ROB30".
n
The change of 0 → 1 takes only 1 second to be reflected, however, the change of 1 → 0 takes 4
seconds.
5. Change the value of Ruby_BRT_SENS_DAC_VAL, and write down the value just before the value
of GPIO_SONY_OPT_SENS is changed "0" → "1" and the laser power value.
Here, these values are called "RUB30" and "P_RUB30".
n
The change of 0 → 1 takes only 1 second to be reflected, however, the change of 1 → 0 takes 4
seconds.
6. Based on the values of the luminance sensor 1 and 2 that were written down, and the power wattage
value, obtain the value at the point of "Electric power threshold limit value" using a formula.
Electric power threshold limit value = 210 mW
Set the obtained values in ROB_BRT_SENS_DAC_VAL and Ruby_BRT_SENS_DAC_VAL respectively.
The formula is as follows.
ROB_BRT_SENS_DAC_VAL = ("ROBmax" _ "ROB30") * (Electric power threshold limit value _
"P_ROBmax") /("P_ROBmax" _ "P_ROB30") + "ROBmax"
DAC value
Value to be obtained
ROBmax
ROB30
P_ROB30
2-12 (E)
Find a line formula based on the
two points, and obtain the DAC
value at the point of the electric
power threshold limit value.
P_ROBmax Electric power
threshold limit
value
mW
VPL-FHZ65