3. Mode
35950
4/4
35950
Self-diagnostic
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! AUTO and MANUAL
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! Direct modulation of the R and B lasers
$ LD stands for a laser diode, a device that is used to output laser.
The LD control PCB adjusts the magnitude of current to supply to the LD according to the input signal size (from 0
V to 1 V), then the LD changes the laser intensity according to the magnitude of the current.
The LD control PCB changes the laser intensity according to the magnitude of LD current of the input signal (0 V to
1 V).
$ PD stands for a photo diode, a device that converts light intensity to an electrical signal.
A part of laser emitted by the LD is reflected by the half mirror to the PD, then the LD control PCB detects the
output signal of the PD PCB, thus the light intensity is supervised.
The output signal of the PD PCB is called PD voltage.
$ The graph shows values of the PD voltage and the LD current which were measured while an input signal
from the LD control PCB is increased by 0.1 V from 0.1 V to 1.0 V.
In general, increasing the LD current increases laser intensity then also the PD voltage. Therefore, if both graphs are
almost proportional, there is no problem.
Graphs of the LD current may change even though there is no problem.
This is because the characteristics of the LD slightly changes with temperature and time.
Changes in characteristics of the LD fluctuate laser intensity. Such fluctuations are controlled so they are corrected,
which changes the value of LD current.
For the above reason, normal LD current graphs may be different in proportion or may be slightly distorted, the lines
may not be straight.
• For normal graphs, see ☞AUTO in 35950 or Step 3 in 35951.
• For graphs with problems, see Step 4 in 35951.
Explanation
Diagnosis Click this to execute Laser Self-Diagnostic (AUTO)/(MANUAL).
Cancel Click this to exit Laser Self-Diagnostic.
$ Light Source Status (G)
Number of light source
error
Searches for ☞No. 06106 G Laser light source status error. in the error record then shows the number of
times it occurred.
Error record
☞No. 06106 The error record of ☞No. 06106 G Laser light source status error. is shown.
$ Temperature sensor
Laser Thermosensor Displays the R and B lasers temperatures.
Laser Unit Thermosensor Displays the temperature of the laser unit.
LD control PCB
Input signal
PD voltage
PD PCB
PD
Half mirror
LD current
LD
G085178
Distributed by: minilablaser.com
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