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Chapter 5 Troubleshooting
5-1 DU-25
5.1. General
This section explains how to take the corrective action against a trouble. Since every
operating function of the duplexer is commanded through the communication with the
printer, most troubles could happen due to the communication error between the
duplexer and the printer.
Firstly, following the basic check flow on the next page can lead you check and solve the
errors involved with the communication circuit and the power supply.
5-2 DU-25
5.1.1. Preparation and precaution
To operate the duplexer while it is separate from the printer, use an extension cable jig. It
should allow the duplexer to be fed power from the printer.
Before connecting an extension cable to the duplexer and to the printer, be
sure that the printer's power switch is set to off.
To conduct troubleshooting on the duplexer, no other option equipment should be con-
nected together with the duplexer and the printer.
5-3 DU-25
5.2. Electrical troubleshooting
The flow charts follow help isolate the defective parts in the duplexer. If the duplexer
needs to be dismantled in the procedures below, refer to Chapter 2, Disassembly.
5-4 DU-25
5.2.1. Basic check
The flow chart below is used to check the power lines and communication lines in the
duplexer. This check must be conducted with the duplexer installed with the printer.
Basic check
5-5 DU-25
5.2.2. "Duplex unit rear cover open" does not go off
The rear cover status is monitored by a microswitch at the rear of the DU-25. Investigate
this microswitch following the procedures below.
Cover open message does not go off
5-6 DU-25
5.2.3. Feed motor does not rotate
If the feed motor does not rotate, paper jam occurs. Investigate the motor power supply
using the following procedures.
Feed motor does not rotate
5-7 DU-25
5.2.4. Paper detection sensor
The duplexer uses two sensors for detecting paper transportation. Failure of either sen-
sor can cause paper jam. To investigate the failure of these sensors, start investigation on
sensor 1, then 2 using the same manner as for sensor 1.
Investigating failure on paper detection sensor 1
Using the same procedures above, investigate the operation of sensor 2 on the reversing
bay unit. In doing so, use pin 18 of CN2 for pin 2 of CN4 on KP-639; and use pin 20 of
CN2 on for pin 3 of CN4 on KP-639.
5-8 DU-25
5.2.5. Reversing sensor
The reversing sensor (STSEN2) in the reversing bay detects presence of paper in the
reversing bay. If failure is suspected with this sensor, use the following procedures for
investigation.
Investigating failure on reversing bay sensor
5-9 DU-25
5.2.6. Reversing bay paper sensor
Reversing bay paper sensor (STSEN1) detects paper entering the reversing bay. Failure
on this sensor can cause paper jam.
Reversing sensor
5-10 DU-25
5.2.7. +24V line check
Following the procedures below allows investigation in the +24V power line in the
duplexer. For the +5V line, refer to Basic check.
+24V check
5-11 DU-25
5.2.8. Duplexer error messages
The printer continuously monitors the status of the duplexer. In case of an error, it indi-
cates an error code comprising a C and a number correponding to the location of the
error. The error code is succeeded by the message Call service person.
The error code(s) pertaining to the duplexer is as tabled below. Other error codes are
detailed in the printer's service documentation.
Duplexer error(s)
Table 5.1. Duplexer error message
Error Meaning Suggested cause Corrective action
C1 The DU-25 cannot establish The DU-25 main board or the Follow procedure on Basic check
communication with the printer's engine board is to isolate the location of failure.
printer's engine CPU. defective. The option interface
connector is defective.
5-12 DU-25
5.3. Mechanical component
This section provides procedures for isolating paper jams or paper skew. These failures
can typically occur due to the faulty components.
5-13 DU-25
5.3.1. Skew feed
If printer ejects paper in a skewed direction only when the duplexer is installed in it, fol-
low the flowchart below. This will allow determine whether the paper is skewed because of
the duplexer or the printer.
Skew feed
5-14 DU-25
5-15 DU-25
5.3.2. Paper jam
The flowchart below should be used to determine the location of paper jam. For actual
actions to be taken for correction, refer to the sections that follow this diagram.
Paper jam
Hints on removing paper jam
Bliking READYindicator on the DU-25 can mean one of the following possibilities: