3-10 Phaser 6300/6350 Color Laser Printer Service Manual
4. When you are instructed to take resistance readings between “P/J 232 <=>
P/J 210” (without specified pin numbers), check all pins. Refer to the section
"Wiring Diagrams" on page 10-13 for the location of all wiring harnesses and
pins.
5. When you are instructed to run a test, run the Service Diagnostics test associated
with the component being examined.
6. When you are 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.
7. Before measuring voltages make sure the printer is switched On, the Imaging
Unit and the paper trays are in place, and the interlock switch is actuated, unless a
troubleshooting procedure instructs otherwise.
8. All voltage values given in the troubleshooting procedures are approximate
values. The main purpose of voltage readings is to determine whether or not a
component is receiving the correct voltage value from the power supply 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.
9. When a troubleshooting procedure instructs you to replace a non-spared
component and that component is part of a parent assembly, you should replace
the entire parent assembly.
10. Ensure that you are using a supported media size and type, refer to "Media and
Tray Specifications" on page 1-17.
11. Power and signal grounds are connected to the frame ground. All circuit
troubleshooting can be performed using the metal frame (chassis) as the
grounding point. To locate connectors or test points, refer to the section "Plug/
Jack Locator Maps" on page 10-2 or "Wiring Diagrams" on page 10-13 for more
information.
Unless otherwise specified, the following voltage tolerances are used within this
section:
Stated Measured
+3.3 VDC +3.135 to +3.465 VDC
+5.0 VDC +4.75 to +5.25 VDC
+24.0 VDC +21.6 to +26.4 VDC
0.0 VDC Less than +0.5 VDC
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