Measuring Ac Power Supply Voltages - Xerox WorkCentre C2424DX Service Manual

Measuring AC Power Supply Voltages

AC line voltages are present on the power supply and possibly in the system, via the
heaters, while the system is plugged into an AC outlet. The power switch is detected
by software and proper shut down is followed by a power off signal to the power
supply. The system may be operating for a considerable time after the switch is turned
off.
1. Power off the system and try a different outlet.
2.
Turn off the system, wait for shutdown, and unplug it from the power outlet.
3.
AC Input: With a DMM set to measure AC voltages, measure the power being
supplied to the system; it should measure between 90 to 140 VAC (115 VAC
nominal) or 180 to 264 VAC (220 VAC nominal).
4.
Proceed to the step, "Testing Motor and Solenoid Resistances" below.
5.
If a heater shorts, F2 or F3 opens. The power supply does NOT shut down;
however, a Service Required error code is displayed on the control panel.
Detecting condition of Fuse F2 and F3
1.
The drum and preheater connect to F2.
2.
The printhead and ink loader connect to F3.
3.
Turn the power switch off and wait for the system to shut down.
4.
Unplug the power cord.
5. Remove the Ink loader Assembly and Door as specified on page 8-13.
6.
From the back of the system you will see one heater cable connector on the left
near the power switch and two under the ink loader.
7.
Place the power switch in the ON position and make the following
measurements:
a.
Using an ohmmeter, measure the resistance between the lowest pin on the
left side, just above the power switch, and the lowest pin on the AC input
connector. If the meter measures 0 ohms, F3 has not been damaged.
b.
Measure between the right most pin under the ink loader and (again) the
lowest pin on the AC input connector. If the meter measures 0 ohms, F2 has
not been damaged.
8.
The heater triacs are not accessible for measurement and are disconnected from
loads if the switch is off or the system is powered down.
9.
Replace the Inkloader Assembly and Door following the test.
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