Kodak DirectView CR 825 Diagnostics Manual page 172

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