Preface; How To Troubleshoot; Terminology - Xerox 5915 Service Manual

2-2

2.1 Preface

2.1.1 How to Troubleshoot

Level 1 Troubleshooting
• Level 1 Troubleshooting (Level 1 F.I.P.) is the first step
toward the diagnosis of a problem.
Level 1 F.I.P. asks you whether or not any Status Code
and other problems exist, guiding you to Level 2
Troubleshooting.
Level 2 Troubleshooting
• Level 2 Troubleshooting is a diagnostic procedure of
isolating one problem by classified Status Codes,
Misfeed Jams and various problematic symptoms.
Performing a F.I.P. or an appropriate procedure in the
check list enables you to discover causes of a problem
in a short period of time.
• Status Code
When a Status Code alerts you to a machine failure,
perform appropriate troubleshooting items, referring to
the list of Status Codes listing problem contents and
corrective actions or troubleshooting items.
How to Troubleshoot and Notes
• First perform Level 1 F.I.P. to isolate one problem.
Then go to an appropriate Level 2 Troubleshooting,
BSD, or Disassembly/Assembly/Adjustment procedure
to resolve the problem. When you try to find a cause of a
problem using a F.I.P. or Check Chart, you should read
its procedure carefully and perform it properly. When
there are a number of possible causes, you may perform
a F.I.P. of the same title again, because it is impossible
to find all causes at once. In this case, pay attention to
different judgments made in the process of the same
F.I.P.
• When taking voltage measurements or performing
operation tests of electric appliances, you should cheat
their Interlock Switches.
• When replacing PWBs, you should check connectors on
them for proper connections before replacements.

2.1.2 Terminology

Troubleshooting uses the following terms. You need to understand these terms in analyzing failures.
Common Terminology
Status Code The message "Report XX." appears when the machine discovers a problem. This XX
is called Status Code.
Actuate Mechanically press or release the Switch Actuator or the linking Mechanical Linkage.
Block Place a document or a sheet of paper against the Photo Sensor to make the Sensor
detect one.
Check Visually Check parts such as the Relay or Mechanical Linkage for its proper operation
or check to see if parts are defective.
Enter Diagnostic Mode. Enter Diagnostic Mode following the procedure indicated in Diagnostic(C/E) Mode.
Check for a short circuit. Power off. Measure the resistances between the wire and the frame with the tester
Ohm range.
Check for an open circuit Power off. Measure the resistance on the both ends of the wire with the tester Ohm
range.
Set [*.*] to ON Enter Diagnostic Mode following the procedure indicated in Diagnostic(C/E) Mode.
Then enter [Chain Code & Function Code]. Once you have entered Diagnostic Mode,
you must not exit it until you are instructed by the message to "Exit Diagnostic Mode"
or you don't need to check any more because an area where a failure has occurred is
found.
Stop [*.*] Press the Stop button to set the drive signal for the output component being tested to
OFF.
Exit Diagnostic Mode Exit Diagnostic Mode following the procedure described in Diagnostic Mode/Program.
Check Voltage Levels
• + 5.2VDC ± 0.25VDC
+ 5VDC
• + 24VDC ± 2.4VDC
+ 24VDC
Breakaway from Failure Analysis Procedure
Mechanical Problem This is used when you should move to mechanical adjustments and parts
replacements. Read all items (describing main causes) and find causes of a problem
in comparison with symptoms the machine shows.
PL 4.2 Refer to Parts List PL 4.2, Section 5.
BSD 6 Refer to BSD 6, Section 9.
4.1.3 Refer to 4.1.3, Section 4 Disassembly/Assembly/Adjustment.
Replace parts in order When it is impossible to further analyze causes of a problem, replace parts in order.
Replacement parts are described in order of highest possible replacement items.
Section 2 Troubleshooting
NOTE: The voltage values may exceed their ranges
a little due to varying AC powers or loads.
2.1 Preface