Xerox Phaser 6200B, Service Manual

Page: 40 / 386

22 Phaser 6200 Color Laser Printer - Service Manual
7. 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.
8. 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.
Voltage Measurements
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 341 or "Wiring Diagrams" on page 351 for more information.
Unless otherwise specified, the following voltage tolerances are used within this
section:
Voltage Measurements
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