Xerox WorkCentre 5020 Service Documentation page 16

Check the Status of Installation
Before starting to troubleshoot, always check the following items:
• The voltage of the power supply (measure the voltage at the power outlet to see if it is
within specification).
• The power cord for damage, short circuits, open circuits, and wrong internal connections.
• The machine for proper grounding.
• The machine is not installed in a place with high temperature, high humidity, low tempera-
ture, low humidity, or a place with drastic changes in temperature.
• The machine is not installed near a water outlet, humidifier, heater or fire source, dusty
areas, or under the direct draft of an air conditioner.
• The machine is not installed in a place where volatile or flammable gas is generated.
• The machine is not installed in a place exposed to direct sunlight.
• The machine is installed in a well-ventilated place.
• The machine is installed on a stable level surface.
• The paper is within specification (standard paper is recommended).
• The machine for any improper handling.
• The Periodic Replacement Parts are replaced at the proper intervals.
Safety Considerations
• Before servicing, always unplug the power cord unless required otherwise. When the
power is turned ON, never touch a current-carrying part unless required otherwise. Also,
since current is carried in the LVPS power switch/inlet even when the power is turned
OFF, never touch this area.
• When turning the power ON to perform a check while the Interlock Switch or Security
Switch is also turned ON and the covers are removed, always disconnect the connector
( P/J140) that is connected to the ROS, unless required otherwise, because a laser beam
might be emitted from the ROS.
• When connecting the connector ( P/J520) on the HVPS according to the instructions in
the RAP, never touch the HVPS and high-voltage output parts.
• When performing a high voltage output check using the Input Diagnostics or Output Diag-
nostics in Diagnostic Mode, make sure that all covers are installed unless specified other-
wise. Also, never touch any high voltage output section when performing the high voltage
output check.
• When operating the Drive Section using the Input Diagnostics or Output Diagnostics in
Diagnostic Mode, make sure that all covers are installed unless specified otherwise. Also,
never touch the Drive Section while operating it.
• Be careful not to burn yourself when touching parts that can get very hot.
• When servicing, use a grounded wrist band to remove static electricity from your body.
Things to Note When Using RAPs
• When troubleshooting using RAPs, prepare normally working parts such as the AIOC
PWB, LVPS, HVPS and Fuser in advance because they might be required to identify a
failure. In addition, if the fault cannot be repaired, replace the "parts considered to be the
cause" and related parts in sequence and check the operation.
• When servicing, always disconnect the power cord unless required otherwise. When the
power cord is connected, never touch any current-carrying part unless absolutely neces-
sary.
Status Indicator RAPS
• Descriptions related to connectors are expressed as follows: "P/J12" -> The connector (P/
J12) is in the connected state. "P12" -> The plug side when the connector (P/J12) is in the
disconnected state (except when it is directly connected to a board). "J12" -> The jack
side when the connector (P/J12) is in the disconnected state (except when it is directly
connected to a board).
• In a RAP, "P/J1 <=> P/J2" means that all the opposing pins between "P/J1" and "P/J12"
(refer to Section 7, Wiring Data) should be measured.
• The voltages on small connectors are measured using a special tool. Handle the tool
carefully because it has a sharp tip.
• The numerical values described in the RAPs are for reference only. Approximate values
are considered to be the same.
• Note that for the checks specified in the RAP, you must check the references for the parts
that must be removed and their procedures.
• "Replacement" in the RAPs indicates the parts that are considered to be the cause of the
problem. Check by replacing the parts and, if necessary, the assembly that contains those
parts.
• In the RAPs, the highest level paper supply is called "Tray 1," and the one below it is
called "Tray 2."
• In the RAPs, some procedures are described separately for each specification. Follow the
instructions for your model to repair the faults.
RAP Flow
RAPs are a good place to start in diagnosing a failure. RAPs guide you through the trouble-
shooting process by checking for the presence of error codes and other types of problematic
symptoms. To troubleshoot problems related to image quality, refer to Section 3 Image Quality
Troubleshooting.
July, 2007
2-4
Initial Issue
WorkCentre 5020