Power Supply Unit; Checking Voltage Levels - GRAPHTEC CS2000 Service Manual

9.2 Power Supply Unit

1. Checking Voltage Levels

(1) Turn off the power for the scanner unit.
(2) Detach the connector (CN2) from the power board before checking voltage levels.
(3) Turn on the power for the scanner unit and check voltage levels between the pins listed below.
When making measurements, take care to prevent shorting the ground and output terminals.
The output voltage levels and permissible ranges are given below.
3.3 V power supply (LDS15F-3-3.3)
Pin No. Output voltage
1
2
3
4
When checking for +3.3 V, use Pin No.1 or 2 as the ground terminal.
5 V power supply (LDS15F-5)
Pin No. Output voltage
1
2
3
4
When checking for +5 V, use Pin No.1 or 2 as the ground terminal.
24 V power supply (LDS75F-24-H)
Pin No. Output voltage
1
2
3
4
5
6
When checking for +24 V, use any of Pin Numbers 1 through 3 as the ground terminal.
CS2000-UM-251-9370
Perimssible range
+0V
+0V
+3.3V +3.25V to +3.35V
+3.3V +3.25V to +3.35V
Perimssible range
+0V
+0V
+5V +4.9V to +5.1V
+5V +4.9V to +5.1V
Perimssible range
+0V
+0V
+0V
+24V +23.5V to +24.5V
+24V +23.5V to +24.5V
+24V +23.5V to +24.5V
9. BOARDS AND ELECTRICAL COMPONENTS
9-4