Measurement Techniques - Fuji Xerox Phaser 5500 Service Manual

Measurement Techniques

1.
Unless indicated otherwise, the instruction "switch On printer main power"
means for you to switch On printer power and let the printer proceed through
POST to a 'Ready' condition.
2. When instructed to take voltage, continuity or resistance readings on wiring
harness, proceed as follows: Check P/J 232–1 to P/J 210–5 by placing the red
probe (+) of your meter on pin 1 of P/J 232, and place the black probe (–) of your
meter on pin 5 of P/J 210.
3. When instructed to take resistance readings between
"P/J 232 <=> P/J 210" (without specified pin numbers), check all pins. See
"Wiring Diagrams" for the location of all wiring harnesses and pins.
4.
When instructed to take a voltage reading, the black probe (–) is generally
connected to a pin that is either RTN (Return) or SG (Signal Ground). You can
substitute any RTN pin or test point in the printer, and you can use FG (frame
ground) in place of any SG pin or test point. To locate connectors or test points,
see "Wiring Diagrams" for more information.
5.
Before measuring voltages make sure the printer is switched On, the Drum
Cartridge and the paper trays are in place, and the interlock switches are actuated,
unless instructed otherwise.
6.
All voltages given in the troubleshooting procedures are approximate values. The
purpose of voltage readings is to determine whether or not a component is
receiving the correct voltage and if gating (a voltage drop) occurs during
component actuation. Gating signals may be nothing more than a pulse, resulting
in a momentary drop in voltage that may be difficult or impossible to read on the
average multi-meter.
Unless otherwise specified, these voltage tolerances are used within this section:
Stated
+3.3 VDC
+5.0 VDC
+24.0 VDC
0.0 VDC
Error Messages, Codes, and Procedures
Measured
+3.135 to +3.465 VDC
+4.75 to +5.25 VDC
+21.6 to +26.4 VDC
Less than +0.5 VDC
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