DIAGNOSTICS Test Points and LEDs
10DEC05
DG4825-1
Page
172 of 180
Table 19 Test Points on the GALVO BOARD A4
Table 20 Adjustment Points on the GALVO BOARD A4
TP Description Expected Signal
1 Ground 0 V DC
2 Ground 0 V DC
3 Ground 0 V DC
4 Ground 0 V DC
5 +15 V DC power supply 14.4 - 15.6 V DC
6 –15 V DC power supply –14.7 - –5.3 V DC
7 COIL RETURN SIGNAL of the
GALVO
–1.25 - +1.25 V DC
9 Speed of the GALVO Signal is used to set the speed at the end of
the movement of the GALVO
10 ACTUAL POSITION -----
11 DESIRED POSITION -----
12 “Line Done” signal indicates to
the DIGITIZER BOARD A3 to
start the next line.
High pulse approximately every 13 mS
during scanning
13 AGC voltage for GALVO
SENSORS
• 9.9 - 10.1 V DC
• < 20 mV AC
14 POSITION SUMMING AMP -----
15 +5 V DC power supply 4.8 - 5.2 V DC
16 –24 V LASER –23.5 - –24.5 V DC
17 BACK_FACET_VOLTAGE 1.0 - 1.1 V DC with the laser at full power
RESISTOR Description
R1 Adjust the RESISTOR until WAVEFORM on TP9 indicates the correct
speed when the GALVO is moving.
R2 Adjust the RESISTOR until the AGC signal on TP3 is 10 ± 0.1 V DC.
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