Measuring Dc Power Supply Voltages - Xerox Phaser 8400 Service Manual

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3.
AC Input: With a DMM set to measure AC voltages, measure the power being
supplied to the printer; 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 F3.
2.
The printhead and ink loader connect to F2.
3.
Turn the power switch off and wait for the printer to shut down.
4.
Unplug the power cord.
5.
Remove the Ink Loader Assembly and Door as specified on page 8-8.
6.
From the back of the printer 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 printer is powered down.
9.
Reinstall the Inkloader Assembly and Door following the test.

Measuring DC Power Supply Voltages

1.
Check the power supply status LEDs, they should be bright.
2.
If the printer is operational, use the diagnostic test Monitor Voltages.
Note
DC voltage test points can be found on the power control board. When you
remove the rear access cover, you will see the test points below the RAM
DIMM's on the power control board.
4-76
Phaser 8400/8500/8550 Color Printer

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