Xerox WorkCentre Pro 423 Service Manual page 34

WorkCentre Pro 423/428
2.1 Preface
How to Troubleshoot
Level 1 Troubleshooting
Level 1 Troubleshooting (Level1 FIP) is the first step to diagnosis of a problem. Level 1
FIP asks you whether or not any status code and other problematic symptoms exist,
guiding you to Level 2 Troubleshooting or BSD to resolve the problem.
Level 2 Troubleshooting
Level 2 Troubleshooting is a diagnostic procedure for isolating one problem by
problematic symptoms such as Status Codes, etc. Performing a FIP 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 presumable problem
causes and corrective actions.
Diagnostic (C/E) Mode
This shows purposes of and usage of diagnostic functions and how to read diag data.
How to Proceed Troubleshooting and Cautions
l Make sure you perform the following procedure when turning off the Circuit Breaker
on the machine with the Fax.
1. When the Document in Memory lamp lights, check that document is stored in
Memory Receive. When the machine has document in Memory Receive, outut the
document by following the message on display. When there are no documents in
store, output Pending Jobs Report and check the contents.
2. Press the Check button to confirm that there is no data under transmission or
waiting for transmission.
l Firstly perform Level 1 FIP to isolate a problem.
Secondly, proceed to an appropriate Level 2 Troubleshooting (or Image Quality
Troubleshooting in Section 3) to resolve the problem. To find causes of the problem
using a FIP or Check procedure, thoroughly read instructions and follow the
procedure properly. When two or more causes may exist, they cannot be identified
at once, so a same FIP should sometimes be repeated. In this case, pay attention
to different judgments made in the process of the same FIP.
When taking voltage measurements or performing operation tests of electric
appliances, cheat their Interlock Switches.
When replacing PWBs, check connectors on them for proper connections
before replacements.
l When it is impossible to resolve problems with the Fax, contact the national
Technical Specialists and the local support centre.
2-2
03/02
1. Glossary
The following terminology and sentences are used throughout the troubleshooting section.
Terminology
Status Code Codes (A to X) displayed on the Control Panel when the
machine detects failures are called Status Codes.
Enter Diag(C/E) Mode. Press the Start button while pressing "0" key on the
keypad for three or more seconds.
Exit Diag(C/E) Mode. Press the Start button while pressing "0" key on the
keypad.
Press the Restart button on the Chain-Function display.
Check for a short circuit Turn off the Main Power Switch and measure resistance
between the wire and the frame using the ohm range of
a tester. (Since a short circuit may exist inside the PWB
or component, measure the resistance maintaining the
wire connected to the connector.)
Check for an open wire Turn off the Main Power Switch. Check continuity and
or poor contact. connection of the wire and check the connector for a
poor connection due to contamination by dirt, etc using
the ohm range of a tester.
Is voltage +3.3VDC? Check to see if the voltage is between +3.0 and
Is voltage 0VDC? +3.7VDC.
(at +3.3VDC Check to see if the voltage is between 0 and +0.5VDC.
measurement)
Is voltage +5VDC? Check to see if the voltage is between +4.5 and
Is voltage 0VDC? +5.3VDC.
(at +5VDC Check to see if the voltage is between 0 and +1VDC.
measurement)
Is voltage +24VDC? Check to see if the voltage is between +22.0 and
Is voltage 0VDC? +25.7VDC.
(at +24VDC Check to see if the voltage is between 0 and +3.0VDC.
measurement)
Enter Diag Code[X-XX] Enter the input/output test mode using the procedure
specified in "2.X How to Use Diag (C/E) Mode", then
enter Chain/Function codes [X-XX] for an input/output
component to be checked.
Excute Diag Code[X-XX] Enter the input/output test mode using the procedure
specified in "2.X How to Use Diag (C/E) Mode", then
enter Chain/Function codes [X-XX] for an input/output
component to be checked. Press the Start button.
PL 4.2 Refer to PL4.2 in Chapter 5, Parts List.
Replace parts in order When it is impossible to analyze further causes of a
problem, replace parts in order. Replacement parts are
listed in the order of higher replacement frequency or
higher possibility of being a problem cause.
CHAPTER 2 TROUBLESHOOTING
2.1 Preface
Description