DocuPrint C55/C55mp/[NC60]
Color Laser Printer
(50/60 Hz)
Service Manual
701P14760
February, 1999
CAUTION
Certain components in the DocuPrint C55/C55mp/
[NC60] Color Laser Printers are susceptible to
ESD procedures to avoid component damage.
NOTICE
CLASS 1 LASER PRODUCTS
“All Service documentation is supplied to Xerox
external customers for informational purposes
only. Xerox Service Documentation is intended
for use by certified, product trained personnel
only. Xerox does not warrant or represent that
such documentation is complete, nor does Xerox
represent or warrant that it will notify or provide
to such customer any future changes to this
documentation. Customer performed service of
equipment, or modules, may affect the warranty
offered by Xerox with respect to such equipment.
You should consult the applicable warranty for its
terms regarding customer or third party provided
service. If the customer services such
equipment, modules, components or parts
thereof, the customer releases Xerox from any
and all liability for the customer actions, and the
customer agrees to indemnify, defend and hold
Xerox harmless from any third party claims
which arise directly or indirectly from such
service.”
This product is certified as a Class 1 Laser
product and complies with DHHS LaserRadiation Standards, 21 CFR Chapter 1 Subchapter J.
WARNING
Use of controls, adjustments, or performances of procedures other than those
specified in this manual may result in
hazardous radiation exposures.
The C55/C55mp/[NC60] each contain an
invisible laser. There is no visual indication that
the laser beam is present. During servicing, the
C55/C55mp/[NC60] remain a Class 1 product
because of the interlock system. Do not attempt
to cheat the interlock switches on this printer.
Prepared by:
Xerox Corporation
Multinational Customer and Service Education
780 Salt Road
Webster, New York 14580
About This Manual --------------------------------- ii
Organization -----------------------------------------ii
How to use This Manual--------------------------iii
Reference Symbology-----------------------------iii
This manual is part of a multinational
documentation system which includes
Training.
This manual contains information that applies
to:
• USCO
• XE
• XCL
• ACO
This service manual covers both the C55 and
NC60 product families.
Unique NC60 directions will be given in [ ]s.
For example:
Press the On Line [0] key.
The On Line key is unique to the C55 family
and the [0] key is unique to the NC60.
If the entire procedure is unique to a product
family, it will be noted at the top of the page
and in the footer at the bottom of the page.
“USCO” references apply to 115 Volt printers.
“XE” references apply to 220/240 Volt printers.
“Dry Ink” means the same as “Toner” and
“Tag” means the same as “Mod”.
ORGANIZATION
This manual is divided into seven sections
organized as follows:
A Publications comment sheet is provided at
the end of this manual.
Section 1 - SERVICE CALL PROCEDURES
This section contains the following:
• Call Flow Instructions
• Initial Actions
• System Checks
• Every Call Activities
• Scheduled Maintenance
• Final Action
Call Flow
The call flow chart shows you how to conduct
the service call.
Initial Actions
The initial actions suggests how to collect data
necessary to proceed with the service call.
System Checks
The System Checks procedures details the
steps for effective repair and verification of
repair of problems found in Initial Action.
Every Call Activities
These are cleaning and maintenance activities
which are performed on every call.
Scheduled Maintenance
Scheduled Maintenance consists of checking
the life remaining on the CRUs.
Final Action
Final Action ensures that image quality is
acceptable, and that printer performance and
appearance is satisfactory. Details are
included for completing administrative tasks
and closing out the service call.
Section 2 - STATUS INDICATOR REPAIR
ANALYSIS PROCEDURES (RAPs)
This section contains the Repair Analysis
Procedures (RAPs) necessary to repair faults
other than image quality faults.
This section contains the Repair Analysis
Procedures (RAPs) necessary to repair image
quality faults.
Section 4 - REPAIR/ADJUSTMENT
PROCEDURES
This section contains the Repair and
Adjustment procedures for the printer. All
unique procedures will be identified as follows:
• USCO
• XE
Section 5 - PARTS LIST
This section contains exploded view drawings
and referenced replaceable parts lists for the
Printer.
Section 6 - GENERAL PROCEDURES
This section contains Diagnostic procedures,
Menus, Product Specifications, ESS/IOT test
patterns, and other General Procedures.
Section 7 - WIRING DATA
This section contains Block Schematic
Diagrams (BSDs), Plug/Jack/PWB Location
Diagrams and wiring diagrams.
2/99
iiDocuPrint C55/C55mp/[NC60]
INTRODUCTION
HOW TO USE THIS MANUAL
GND
A/D
Section 1, Service Call Procedures will direct
you to each section of the manual necessary
to perform a service call.
You will begin with Initial Actions which
suggest how to collect problem symptoms and
evidence to be used in the next section, the
System Checks Section.
Details in the System Checks are designed to
assist you in classifying, repairing and verifying
the repair of the problem. From here, you may
be directed to any of the other six sections of
the service manual depending on the
symptoms observed and the results of
suggested tests. After a repair has been
verified (or during a repair activity) instructions
are included to direct you into Every Call
Activities.
Descriptions of commonly used graphic
symbols are included in order to aid
troubleshooting when using the circuit
diagrams.
Switches/Relays
Safety interlock switch, circuit open.
Safety interlock switch, circuit closed.
Switch/relay with momentary contacts
shown normally open.
Switch/relay with momentary contacts
shown normally closed.
MOT
This symbol, used with a number,
indicates that the actual number may
be equal to or very near the value of
the designated number.
Triac, used to switch AC power.
Light Emitting Diode (LED).
Led/Phototransistor Sensor.
Motor.
REFERENCE SYMBOLOGY
Reference Symbology provides supportive
data for Repairs, Adjustments, and the RAPs.
The symbols that refer to this supportive data
are shown in the paragraphs that follow.
Note:
1
Parts Lists
PL 2.4 (example)
In the example above, the parts list reference
and the exploded view drawing would be found
in Section 5 on sub-section 2.4.
This symbol is used to refer to notes,
usually found on the same page.
Magnetically actuated Switch.
Miscellaneous Symbols
2
A flag that identifies a wire that has
been referred to in the text.
[ 8-2 ]Indicates a Diagnostic Code used to
check a particular component.
Identifies a test point, test hole or test
stake on a PWB.
A
Auditron/Key Counter connection.
2/99
Thermistor Bead, used to sense
temperature.
A Driver which is used to switch on
DC Components.
Analog to Digital Converter.
RL
Relay
Solenoid
DocuPrint C55/C55mp/[NC60]iii
INTRODUCTION
Signal Continuation/Flow
47
47
Tag Identification
Indicates the continuation of a signal
line interrupted in a horizontal
direction.
Represents the continuation of a
standby power line interrupted in the
vertical direction. In all cases, the
supply is from Standby Power
Indicates a feedback signal.
Indicates a common splice of wires.
Indicates a common splice of wires at
a pin.
Indicates the direction of signal flow.
Indicates that the wire continues to
the adjacent page.
47
This WITH TAG Symbol is used to
identify the components or configura-
47
tion that are part of a printer change
covered by the Tag number.
This WITHOUT TAG Symbol is used
to identify the components or
configuration that are not part of a
printer change covered by the Tag
number
FINAL ACTION-----------------------------------1-5
1. SERVICE CALL PROCEDURES
2/99SERVICE CALL PROCEDURES
DocuPrint C55/C55mp/[NC60]1-1SECTION CONTENTS
CALL FLOW
INITIAL ACTION
This step is used to gather information about the
reason for the call, to determine the machine
condition, and to run print samples.
SYSTEM CHECKS
This step is used to suggest a direction for using the
information, obtained during Initial Action. You can
then repair and verify the repair of the problem. This
step may also provide information to assist in the
identification of new problems and suggest actions to
take to repair/resolve them.
EVERY CALL ACTIVITIES
This step consists of every call cleaning and
maintenance activities.
SCHEDULED MAINTENANCE
This step is used to check the life remaining on the
CRU’s.
FINAL ACTIONS
This step is used to ensure that the print quality, the
printer performance, and the printer appearance is
satisfactory. It will also provide direction to help
complete administrative tasks.
SERVICE CALL PROCEDURES2/99
CALL FLOW1-2DocuPrint C55/C55mp/[NC60]
INITIAL ACTION
Purpose
To suggest how to gather information about
the service call, the machine condition, and to
direct the user through the call.
PROCEDURE
1. Ask the customer to describe the problem
that causes the service call and the job
being run when the problem occurred.
2. Inspect any rejected prints for evidence of
defects.
3. Switch the printer power Off/On and check
for and note/record any fault codes in the
Control Panel Display.
4. Examine the Machine Service Log (under
the Left Side Cover) for previous problems
or activities that may be related to this
service call.
5. Go to (SYSTEM CHECKS).
SYSTEM CHECKS
Purpose
To suggest a direction for effective repair and
verification of repair of problems found in Initial
Action.
PROCEDURE
1. Select the appropriate situation from a-g
below, then diagnose and repair the
problem.
a. Replace any obviously broken parts.
b. If this is an Image Quality problem, go
to IQ1 Image Quality Entry RAP in
Section 3.
c. If there is a Fault Code, go to Section
2 Table of Contents. Locate and
perform the RAP associated with the
Fault Code.
d. If there is NO fault code associated
with the problem, go to Section 2
Table of Contents. Locate and
perform the RAP which most closely
matches the problem described by the
customer.
e. If the problem is not repeatable,
operate the printer in the same job
conditions the customer used and
recheck for a problem in the
categories listed here.
f. If the problem still is not reproduced,
check the printer Fault History.
(C55/C55mp)
Off Line, Menu, then scroll to
<SERVICE>, <ERROR LOGS>,
<FAULT HISTORY>. Scroll through
the Fault History and note any
repeating faults. Refer to the RAP for
these fault codes in Section 2 and
read the fault code description to see
if the code relates to the customer
problem. If so, perform the RAP
[NC60]
Menu Up until Print Menu. Item Up
until Fault History then press Enter.
Look through the Fault History and
note any repeating faults. Refer to the
RAP for these fault codes in Section 2
and read the fault code description to
see if the code relates to the customer
problem. If so, perform the RAP.
g. If none of the above situations applies
go to EVERY CALL ACTIVITIES.
2. Verify that the problem is corrected and go
to EVERY CALL ACTIVITIES.
To list service activities required for specific
subsystems.
PROCEDURE
1. Open the printer and Clean the Charge
Scorotron using the Scorotron cleaner.
2. Clean the toner loading area.
3. Remove the Following:
a. Print Drum Module. (GP I)
b. Color Developer Module. (GP 2)
c. Black Developer Module (GP 3)
d. Toner Collector. (GP 4)
4. Vacuum the Drum, Developer, and Toner
Collector areas.
5. Replace the Toner Collector if required.
6. Reinstall the following:
a. Black Developer Module (GP 3)
b. Color Developer Module. (GP 2)
SCHEDULED MAINTENANCE
Purpose
To check the life remaining on the CRUs.
PROCEDURE
1. Check the life of the Customer Replaceable Units (CRUs).
a. (C55/C55mp)
Enter the Off Line mode, press Menu
and scroll to <MAINTENANCE>.
[NC60]
Menu Up until Service Menu, Item Up
until CRU Usage, Value Up to see %
remaining on the CRUs.
b. Check the life remaining on the
following:
• Black Developer Cartridge.
• Color Developer Cartridge.
• Print Drum.
• Fuser Module.
2. If any of the CRUs are near end of life,
notify the customer.
c. Print Drum Module. (GP I)
d. Toner Collector. (GP 4)
7. Use Film Remover to clean the Feed
Rollers. Do not rotate the Feed Rollers
more than 270° while cleaning. Apply
Rubber restore if available.
8. Check the Transfer Drum Nip Adjustment
(ADJ 11.1)
9. Wipe the outside of the printer.
SERVICE CALL PROCEDURES
EVERY CALL ACTIVITIES/ 2/99
SCHEDULED MAINTENANCE1-4DocuPrint C55/C55mp/[NC60]
FINAL ACTION
Purpose
To ensure the image quality is acceptable,
printer performance and appearance is
satisfactory and to complete administrative
tasks.
PROCEDURE
1. Install/close all covers and doors.
2. Run the Print Quality sample set.
a. (C55/C55mp)
Enter the Off Line mode, press Menu
and scroll to <SERVICE>. Select
<TEST PATTERNS>, and print the
PQ set.
[NC60]
Menu Up until Service Menu, Item
Down until Print PQ Set and press
Enter.
3. If possible, ask the customer to print one
of their representative prints to examine
and comment on.
Wrap-Up Procedure
1. Record your service activities in the
service log.
2. Record the Total meter reading (from the
Diagnostic Test Pattern) in the service log.
3. Record the ESS software level (from the
Diagnostic Test Pattern) in the service log.
4. (C55/C55mp)
(Off Line, Print, Settings). Record the NIC
software level (from the Settings page) in
the service log.
5. Put the Printer PQ set and service log into
the service log folder.
NOTE: It is very important to save the PQ
set. There is information on the Diagnostic
sheet (Toner Concentration setpoints) which
will be needed if the NVM is reset or the PCU
PWB is replaced.
2/99SERVICE CALL PROCEDURES
DocuPrint C55/C55mp/[NC60]1-5FINAL ACTION
Notes:
SERVICE CALL PROCEDURES2/99
NOTES1-6 DocuPrint C55/C55mp/[NC60]
2. STATUS INDICATOR RAPs
TITLEPAGE
TROUBLESHOOTING TIPS ------------------2-2
C1-CHECK TRAY 1 -----------------------------2-3
C2-CHECK TRAY 2 -----------------------------2-3
E1-TRAY 1 JAM----------------------------------2-4
E2-TRAY 2 JAM ---------------------------------2-5
E3-BYPASS JAM --------------------------------2-5
E4-INPUT JAM -----------------------------------2-6
E5 FUSER JAM ----------------------------------2-7
E6-DRUM JAM -----------------------------------2-8
E7-PRINT DRUM JAM------------------------2-10
E8-OUTPUT JAM------------------------------2-10
E9-CLOSE PRINTER-------------------------2-10
EA-COLOR DEV. MISINSTALLED--------2-11
EB-BLACK DEV. MISINSTALLED---------2-11
EC-PRINT DRUM MISINSTALLED--------2-11
F1-DISK ERROR (FLOPPY) ----------------2-12
F2-DISK I/O ERROR (FLOPPY) -----------2-12
F3-ACTION FAILED (FLOPPY) ------------2-12
H1-HARD DISK ERROR---------------------2-13
H2-HARD DISK CONTROLLER
ERROR -------------------------------------2-13
H3-HARD DISK FULL-------------------------2-14
H4-FORMAT HARD DRIVE-----------------2-14
TITLEPAGE
J1-ADD YELLOW TONER-------------------2-15
J2-ADD MAGENTA TONER ----------------2-16
J3-ADD CYAN TONER-----------------------2-17
J4-ADD BLACK TONER ---------------------2-18
J5-REPLACE COLOR DEVELOPER
CARTRIDGE--------------------------------2-19
J6-REPLACE BLACK DEVELOPER
CARTRIDGE--------------------------------2-19
J7-TONER COLLECTOR FULL------------2-20
J8-REPLACE PRINT DRUM----------------2-20
J9-REPLACE FUSER MODULE -----------2-20
JA-REPLACE OIL/PAD-----------------------2-21
T0-FUSER THERMISTOR ERROR-------2-21
T1- UNDER TEMPERATURE --------------2-22
T2- OVER TEMPERATURE ----------------2-23
U0-IOT ROM ERROR ------------------------2-23
U1-IOT RAM ERROR-------------------------2-24
U2-IOT NVM RAM ERROR -----------------2-24
U3-IOT/ESS COMMUNICATION
ERROR -------------------------------------2-24
U4-OPTICS FAULT ---------------------------2-25
U5-POLYGON MOTOR FAULT------------2-25
U6-MOTOR FAULT (DEVELOPER) ------2-26
U7- MOTOR FAULT (MAIN) ----------------2-27
TITLEPAGE
W1-COLOR DEVELOPER MODULE
(NEAR END OF USE)-------------------2-28
W2-BLACK DEVELOPER MODULE
(NEAR END OF USE)-------------------2-28
W3-PRINT DRUM (NEAR
END OF USE)-----------------------------2-28
W4-FUSER MODULE
(NEAR END OF USE)-------------------2-29
W5-FUSER OIL BOTTLE/PAD
(NEAR END OF USE)-------------------2-29
OF1 DEAD PRINTER RAP ---------------- 2-30
OF2 CONTROL PANEL RAP ------------- 2-32
OF3 TRAY 1 PAPER SIZE
The following are some general troubleshooting tips and hints which will help you
locate components and test points.
1. The procedures for entering, exiting and
using the C55/C55mp/[NC60] diagnostic
programs can be found in Section 6,
General Procedures. Refer to the Table of
Contents found on page 6-1 for the
specific program.
2. Figure 2-1 on the right is also located in
Section 6 and shows the location of the
input electrical components in the printer.
It is especially helpful when using the
Switch Scan program. Refer to this figure
if you are unsure of input component
location. The BSDs in Section 7 may also
prove helpful when locating the various
electrical components.
3. The Connectors can be located in
Section 7. Refer to Section 7 Table of
contents on page 7-1. The table below
shows the location of the most common
connectors:
Load paper and insert Cassette 1 into the
printer.
Switch the power off wait 10 seconds and
switch the power on. Recheck for the fault.
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
01, Press Form Feed [1].
Remove Cassette 1. Manually make and
break Paper Size Sensor 0 while observing the
Cyan LED. (Sensor 0 is the first one on the
left when viewed from the front of the printer.)
The Cyan LED switches on and off.
YN
Go to BSD 7.2 in Section 7 and troubleshoot the Paper Size 0 Sensor signal
(CN107-8) for a short to ground.
If no short is found, replace the PCU
PWB. If the problem still exists, replace
the Cassette PWB.
Check for a broken Sensor Flag on the Tray 1
Cassette.
If the problem still exists, replace the PCU
PWB. If the problem still exists, replace the
Cassette PWB.
C2 CHECK TRAY 2 RAP
Cassette 2 is not in the printer.
INITIAL ACTION
Move the length stop to the 11 inch position
(Figure 2-2), load paper, and insert Cassette 2
into the printer.
Switch the power off wait 10 seconds and
switch the power on. Recheck for the fault.
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
03. Press Form Feed [1].
Remove Cassette 2. Manually make and
break T2 Paper Size Sensor 0 while observing
the Cyan LED.
The Cyan LED switches on and off.
YN
Refer to BSD T2, 7.2 in Section 7 and
check the following:
•T2 Paper Size 0 Sensor signal CN109-
1 for an open.
•+5 VDC CN109-5
If no problem is found, replace the PCU
PWB. If the problem still exists, replace
the T2 Cassette PWB.
Check for a broken Sensor Flag on the Tray 2
Cassette.
If the problem still exists, replace the PCU
PWB. If the problem still exists, replace the
Cassette PWB.
14"10.5" 11", A4
Figure 2-2. Length Stop Location
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-3 C1, C2
E1 TRAY 1 JAM RAP
Paper fed from Tray 1 did not reach the
Registration Sensor.
INITIAL ACTION
Remove the cassette and check that the paper
is loaded correctly and is in good condition.
Switch the power off wait 10 seconds and
switch the power on. Recheck for the fault.
PROCEDURE
Check the following:
• Obstructions in the paper path.
• Dirty Feed Rolls.
• Dirty Drive Rollers.
• Mechanical drive problem.
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
00. Press Form Feed [1].
Open the Printer. Actuate and deactuate the
Registration Sensor while observing the
Magenta LED.
The Magenta LED switches on and off.
YN
Go to BSD 8.1 in Section 7 and troubleshoot the Registration Sensor signal, +5
VDC and GND (CN102-9, 7, 8) for an
open.
If no open exists, replace the PCU PWB.
If the problem still exists, replace the
Registration Sensor.
Press Media Server [2]. Select Scan Row 01.
Press Form Feed [1].
Remove the cassette and actuate and
deactuate the Tray Empty Sensor while
observing the Black LED.
A
A
The Black LED switches on and off.
YN
Go to BSD 7.1 in Section 7 and troubleshoot the Tray Empty Sensor signal
(CN102-6) for a short to ground.
If no short exists, replace the PCU PWB. If
the problem still exists, replace the Tray
Empty Sensor.
Exit from the SWITCH SCAN program.
Close the Printer.
Remove the paper cassette. Scroll to the
MOTOR TEST program. Press Form Feed[1] to switch on the motors while observing the
Paper Feed Motor.
The Paper Feed Motor is rotating normally.
YN
Go to BSD 7.3 in Section 7 and trouble-
shoot the +24 VDC Interlocked (CN111-5)
and Paper Feed Motor for an open. If the
motor was noisy, check the clock lines.
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Paper Feed Motor.
Exit from diagnostics.
Set up the meter to read +24 VDC. Measure
between CN101-5 (+) and ground (−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0.
YN
Go to BSD 7.4 in Section 7 and trouble-
shoot the Feed Solenoid signal, and +24
VDC Interlocked (CN101-5, 3) for an
open.
BC
BC
If no open exists, replace the PCU PWB. If
the problem still exists, replace the Paper
Feed Solenoid.
Check for a mechanical problem with the feed
clutch.
STATUS INDICATOR RAPs2/99
E12-4 DocuPrint C55/C55mp/[NC60]
E2 TRAY 2 JAM RAP
Paper fed from Tray 2 did not reach the
Registration Sensor.
INITIAL ACTION
Remove the cassette and check that the paper
is loaded correctly and is in good condition.
Check the position of the rear stop.
Make sure that Tray 1 is pushed all the way in.
Switch the power off wait 10 seconds and
switch the power on. Recheck for the fault.
PROCEDURE
Try to run a print from Tray 1.
The print feeds OK from Tray 1.
YN
Go to E1 TRAY 1 JAM RAP.
Check the following:
• Obstructions in the paper path.
• Dirty Feed Rolls.
• Dirty Drive Rollers.
• Mechanical drive problem.
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
03. Press Form Feed [1].
Remove cassette 2. Actuate and deactuate
the Tray 2 Empty Sensor while observing the
Black LED.
The Black LED switches on and off.
YN
Go to BSD T2 7.1 in Section 7 and
troubleshoot the T2 Tray Empty Sensor
signal (CN109-4) for a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the Tray
2 Empty Sensor.
A
A
Exit from diagnostics.
Set up the meter to read +24 VDC. Measure
between CN109-8 (+) and ground (−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
YN
Go to BSD T2 7.3 in Section 7 and
troubleshoot the T2 Feed Solenoid signal,
and +24 VDC Interlocked (CN109-8, 7) for
an open.
If no open exists, replace the PCU PWB. If
the problem still exists, replace the T2
Feed Solenoid.
Measure between CN109-9 (+) and ground
(−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
YN
Go to BSD T2 7.4 in Section 7 and
troubleshoot the T2 Drive Clutch signal
(CN109-9) for an open.
If no open exists, replace the PCU PWB.
If the problem still exists, replace the T2
Drive Clutch.
Check for a mechanical problem with the Feed
Clutch and Drive Clutch
E3 BYPASS JAM RAP
Paper fed from the Bypass Tray did not reach
the Registration Sensor.
INITIAL ACTION
Carefully inspect the bypass opening for
paper.
Switch the power off wait 10 seconds and
switch the power on. Run another print and
recheck for the fault.
PROCEDURE
If paper does not feed from the Bypass but
does feed from Tray 1, check for an
obstruction in the bypass slot.
Check to ensure that the switch is installed
correctly and has not fallen out.
If no paper is loaded in the Bypass when the
E3 occurs, refer to BSD 7.5 in Section 7 and
check the Bypass Switch signal (CN312-2) for
a short to ground.
If no short exists, replace the PCU PWB. If
the problem still exists, replace the Bypass
Switch.
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-5 E2, E3
E4 INPUT JAM RAP
Paper was on the Registration Sensor too
long.
INITIAL ACTION
Open the printer and check for any obstruction
in the register roller area.
Switch the power off wait 10 seconds and
switch the power on. Run another print to
recheck for the fault.
Make sure the Grounding Roller is rotating
freely.
Perform the Transfer Drum Nip Adjustment
(ADJ 11.1)
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
00. Press Form Feed [1].
Open the Printer. Actuate and deactuate the
Registration Sensor while observing the
Magenta LED.
The Magenta LED switches on and off.
YN
Go to BSD 8.1 in Section 7 and troubleshoot the Registration Sensor signal
(CN102-9) for a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the
Registration Sensor.
Press Media Server [2]. Select Scan Row 04.
Press Form Feed [1].
Actuate and deactuate the Transparency
Sensor while observing the Cyan LED.
A
A
The Cyan LED switches on and off.
YN
Go to BSD 8.4 in Section 7 and trouble-
shoot the Transparency Sensor signal
(CN311-1) for a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the
Transparency Sensor.
Exit from the SWITCH SCAN program.
Close the Printer.
Remove the paper cassette. Scroll to the
MOTOR TEST program and press Form Feed[1] to switch on the motors while observing the
Paper Feed Motor.
The Paper Feed Motor is rotating normally.
YN
Go to BSD 7.3 in Section 7 and trouble-
shoot the Paper Feed Motor clock lines.
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Paper Feed Motor.
Exit from diagnostics.
Set up the meter to read +24 VDC. Measure
between CN103-4 (+) and ground (−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
YN
Go to BSD 9.16 in Section 7 and trouble-
shoot the Stripper Solenoid signal and +24
VDC Interlocked (CN103-4, CN303-2,1) for
an open.
If no open exists, replace the PCU PWB. If
the problem still exists, replace the
Stripper Solenoid.
B
B
Set up the meter to read +24 VDC. Measure
between CN101-5 (+) and ground (−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
YN
Go to BSD 7.4 in Section 7 and troubleshoot the Feed Solenoid signal (CN101-5)
for a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the Feed
Solenoid.
Set up the meter to read +24 VDC. Measure
between CN101-4 (+) and ground (−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
YN
Go to BSD 8.2 in Section 7 and troubleshoot the Registration Clutch signal and
+24 VDC Interlocked (CN101-4, 1) for an
open.
If no open exists, replace the PCU PWB. If
the problem still exists, replace the
Registration Clutch.
Check the following:
•Obstructions torn paper etc. in the paper
path.
•Mechanical drive problem.
STATUS INDICATOR RAPs2/99
E42-6 DocuPrint C55/C55mp/[NC60]
E5 FUSER JAM RAP
Paper did not reach the Exit Sensor.
INITIAL ACTION
Open the Printer and remove the Fuser
Assembly. Check for any obstructions in the
fuser paper path.
Switch the power off wait 10 seconds and
switch the power on. Run another print to
recheck for the fault.
PROCEDURE
Check the following:
• Obstructions in the paper path.
• Defective stripper fingers.
• Mechanical drive problem.
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
00. Press Form Feed [1].
Open the Printer, then open the Fuser cover.
Actuate and deactuate the Exit Sensor while
observing the Yellow LED.
The Yellow LED switches on and off.
YN
With SCAN ROW 00 still selected, actuate
and deactuate the Bypass Switch while
observing the Cyan LED.
The Cyan LED switches on and off.
YN
Go to BSD 10.2 and troubleshoot the
Strobe 2 signal CN103-18 for an open.
If no open exists replace the PCU
PWB.
AB
AB
Go to BSD 10.2 in Section 7 and troubleshoot the Exit Sensor signal, +5 VDC and
GND (CN308-1, 3, 2) for an open.
If no open exists, replace the PCU PWB.
If the problem still exists, replace the Exit
Sensor.
Exit from the SWITCH SCAN program.
Remove the Front Cover and then close the
Printer.
Scroll to the MOTOR TEST program and
press Form Feed [1] to switch on the motors
while observing the Fuser Drive Motor.
The Fuser Drive Motor is rotating normally.
YN
Go to BSD 10.1 in Section 7 and trouble-
shoot the Fuser Drive Motor clock lines.
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Fuser Drive Motor.
• Make sure the Fuser Cover fits correctly.
• Check for a Mechanical problem.
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-7 E5
E6 DRUM JAM RAP
Paper is jammed on the Transfer Drum and
could be caused by one of the following:
•Transfer Drum Cleaner not cleaning the
Transfer Drum or resting on the Transfer
Drum during the Print cycle.
• Paper did not reach the Gamma Sensor.
• Paper did not tack to the Transfer Drum and
actuated the Transparency Jam Sensor.
•Paper did not tack to the Transfer Drum
and actuated the Cleaner Jam Switch.
•Arcing between the Charge Scorotron
connectors and the Print Drum.
INITIAL ACTION
Open the Printer and check for torn paper or
an obstruction in the paper path. Check for a
sheet of paper or a transparency actuating the
Transparency Jam Sensor or the Cleaner Jam
Switch.
Check the Toner Collector for “layered” toner
(sand-art effect). If layered toner is present,
refer to OF8 Arcing RAP.
If the problem only occurs when running color
prints, check the Stripper Fingers for binding
or interference.
Open the Printer and position the Transfer
Drum Home Position Sensor flag at the
3 o’clock position. The Lead edge of the white
patch should be at the tips of the stripper
fingers. If not, replace the Transfer Drum.
PROCEDURE
Switch the Printer off. Remove the front cover
and tape the Control Panel up so that you can
view the operation of the Transfer Drum
Cleaning Solenoid.
Switch the Printer on. Observe the Transfer
Drum Cleaning Solenoid and the Cleaner
Assembly.
If you see solid development during the copy
quality setup, go the OF8 Arcing RAP.
The Transfer Drum Cleaning Solenoid should
energize and move the Cleaner Assembly
against the Transfer Drum while the patches
are generated during the Copy Quality Setup.
When the Copy Quality Setup is complete the
Transfer Drum Cleaning Solenoid should
deenergize and move the Cleaner Assembly
away from the Transfer Drum.
If the E6 jam occurs before paper is fed and
the patches are not being cleaned the Transfer
Drum Cleaner assembly is not camming into
the cleaning position.
If the machine prints OK when printing black
only but jams (E6) when printing color, it is an
indication that the Transfer Drum Cleaner
assembly is staying cammed against the
Transfer Drum.
The Transfer Drum Cleaning Solenoid and
Transfer Drum Cleaner Assembly are
operating correctly.
YN
Check that when the solenoid energizes
the camshaft turns 180 degrees and is
stopped by the outer tab on the cleaner
clutch sleeve. Ensure that the solenoid is
tight and the actuator catches the inner tab
when de-energized, and stops the outer
tab when energized. Check for flashing on
the plastic assembly, a bent solenoid
actuator or other things that could interfere
with proper operation. Clean the cams
and the cam followers with film remover to
minimize friction. Do not attempt to
lubricate these cams. Observe the operation several times and look for smooth,
consistent operation. Do not attempt to
disassemble and adjust the clutch. If the
clutch is defective order the new Cleaner
Clutch Shaft Assembly.
AB
AB
Set up the meter to read +24 VDC. Measure
between CN103-3 (+) and ground (−).
Switch the power off wait 10 seconds and
switch the power on while monitoring the
meter.
The meter swings from +24 VDC to 0
and back to +24.
YN
Go to BSD 9.14 in Section 7 and
troubleshoot the Transfer Drum
Cleaning Solenoid signal and
+24 VDC Interlocked (CN103-3,
CN316-2, 1) for an open or a short.
If 24 VDC is not available at 316-1 on
the Connector PWB, go to BSD 1 and
troubleshoot the 24 VDC Interlocked
(CN114-1, CN103-1).
Check the Transfer Drum Cleaning
Solenoid and the cleaner assembly for
binding.
If the sheet appears to be stopping at the
Transfer Drum to Print Drum Nip, check the
Transfer Drum Nip Adjustment (ADJ 11.1).
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
05. Press Form Feed [1].
Open the Printer. Actuate and deactuate the
Transparency Jam Sensor while observing the
Black LED.
The Black LED switches on and off.
YN
Check for an obstruction that is keeping the
Transparency Jam Sensor actuator raised.
CD
STATUS INDICATOR RAPs2/99
E62-8 DocuPrint C55/C55mp/[NC60]
CD
If OK, refer to BSD 9.17 and check the
Transparency Jam Sensor signal CN314-2
for a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the
Transparency Jam Sensor.
Open the printer and remove the Transfer
Discharge Corotron from the left side of the
printer. You will need to squeeze the corotron
handle to release the corotron.
With Scan Row 05 still selected, actuate and
deactuate the Cleaner Jam Switch while
observing the Magenta LED.
The Magenta LED switches on and off.
YN
Check for an obstruction that is keeping
the Cleaner Jam Switch actuated.
If OK, refer to BSD 9.18 and check the
Cleaner Jam Switch signal CN318-2 for a
short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the
Cleaner Jam Switch.
Exit from the Switch Scan Program.
Scroll to the MOTOR TEST program and
switch on the motors while observing the
Fuser Drive Motor
The Fuser Drive Motor is rotating normally.
YN
Go to BSD 10.1 in Section 7 and troubleshoot the Fuser Drive Motor for an open.
If the motor was noisy, check the clock
lines for an open or short
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Fuser Drive Motor.
E
E
Set up the meter to read +24 VDC. Measure
between CN103-4 (+) and ground (−).
Make one print while monitoring the meter.
The meter swings from +24 VDC to 0 and
back to +24.
YN
Go to BSD 9.16 in Section 7 and troubleshoot the Stripper Solenoid signal and +24
VDC Interlocked (CN103-4, CN303-2, 1)
for an open or a short.
If no short or open can be found, replace
the PCU PWB. If the problem still exists,
replace the Stripper Solenoid.
Set up the meter to read +5 VDC. Measure
between CN103-11 (+) and ground (−).
Switch the power off wait 10 seconds and
switch the power on.
The meter swings from 3.8 VDC to .5 when
the white patch passes in front of the
Gamma Sensor.
YN
Go to BSD 8.5 in Section 7 and troubleshoot
the Gamma Sensor, all lines, for an open.
If the lines are OK, replace the PCU PWB.
If the problem still exists, replace the
Gamma Sensor.
Refer to Section 6, GP 9.3 and perform the
Transfer Voltage Check.
The Transfer voltage is within specification.
F
F
YN
Go to BSD 9.1 in Section 7 and troubleshoot the following for an open or short.
•Black Transfer Lead from the Power
Supply.
• Transfer On Signal (CN106-3).
• Transfer Control Signal (CN106-5).
• Bias Control Signal (CN106-6).
• +24 VDC to Power Supply (CN106-1).
If no wiring problem can be found, replace
the PCU PWB. If the problem still exists,
replace the High voltage Power Supply.
Refer to BSD 9.1 in Section 7 and check the
Charge On Signal (CN106-2) for an open.
Check the following:
• Obstructions in the paper path.
• Dirty Feed Rolls.
• Mechanical drive problem.
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-9 E6
E7 PRINT DRUM JAM RAP
INITIAL ACTION
Open the Printer and clear the jam.
If problem reoccurs refer to E4 RAP.
E8 OUTPUT JAM RAP
Paper was on the Exit Sensor too long.
INITIAL ACTION
We have seen some machines where the
actuator for the Exit Sensor has become stuck
during shipping. When this happens, the
sensor does not change state, and the E8 jam
occurs. If you remove the sensor cover
(PL 2.1) by removing the two screws that
secure it, you can ensure that the actuator is
free and that the sensor is secured in the
proper position in the sensor cover.
Open the Printer and remove the Fuser
Assembly. Check for any obstructions in the
fuser paper path.
Switch the power off wait 10 seconds and
switch the power on. Run another print to
recheck for the fault.
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
00. Press Form Feed [1].
Open the Printer, then open the Fuser Cover.
Actuate and deactuate the Exit Sensor while
observing the Yellow LED.
The Yellow LED switches on and off.
YN
Go to BSD 10.2 in Section 7 and troubleshoot the Exit Sensor signal (CN308-1) for
a short to ground.
If no short exists, replace the PCU PWB.
If the problem still exists, replace the Exit
Sensor.
Check the following:
• Obstructions in the paper path.
• Mechanical drive problem in the feedout
area.
E9 CLOSE PRINTER RAP
The Printer is open.
INITIAL ACTION
Open and reclose the printer.
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
SWITCH SCAN program and select Scan Row
00. Press Form Feed [1].
Open and close the Printer while observing the
Black LED.
The Black LED switches on and off.
YN
Go to BSD 1 (G1) in Section 7 and
troubleshoot the 24 VDC Interlock Switch.
If no open exists, replace the PCU PWB.
If the problem still exists, replace the
24 VDC Interlock Switch.
Replace the PCU PWB.
STATUS INDICATOR RAPs2/99
E7, E8, E92-10DocuPrint C55/C55mp/[NC60]
EA COLOR DEV. MISINSTALLED
RAP
The Color Developer Module was installed
incorrectly or overtoning has occurred.
INITIAL ACTION
Enter IOT normal diagnostics. Scroll to the
TEST PRINT program and press Form Feed[1] to run a test print. While the print is
running, observe the KT=__, CT=__, MT=__,
YT=__ values.
If any of the three color (C, M, Y) toner
concentration values are below 10, that color
is overtoned. Refer to ADJ 9.1 EA “Tone
Down” Procedure in Section 4.
If the values are NOT too low, continue with
this RAP.
Remove the Color Developer Module.
Check the Developer Module connector to be
sure it is clean.
Reinstall the Color Developer Module.
If the problem persists, check connector
CN118 for a good connection or any loose
wiring before replacing the Color Developer
Module.
If the problem still exists, replace the PCU
PWB.
EB BLACK DEV. MISINSTALLED
RAP
The Black Developer Module was installed
incorrectly or the contacts are dirty.
INITIAL ACTION
Remove the Black Developer Module.
Check for binding in the housing.
Check to be sure that the seal has been
removed.
Check the Developer Module connector to be
sure it is clean.
Reinstall the Black Developer Module.
If the problem persists, check connector
CN107 for a good connection or any loose
wiring before replacing the Black Developer
Module.
If the problem still exists, replace the PCU
PWB.
EC PRINT DRUM MISINSTALLED
RAP
The Print Drum Module was installed
incorrectly or is not making a good connection.
INITIAL ACTION
Remove then reinstall the Print Drum Module.
This problem is usually caused by a poor
connection on the left side of the Print Drum
Module. Three contacts are cammed out
when the Print Drum Module is installed.
These contacts make a connection with the
Drum Link PWB located on the left side of the
Print Drum Module. Check to make sure there
is a good connection and the contacts cam
out.
Refer to BSD 9.2 in Section 7 and check the
Drum Detect (H) signal.
If the problem persists, replace the Print Drum
Module.
If the problem still exists, replace the PCU
PWB.
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-11 EA, EB, EC
F1 DISK ERROR (FLOPPY) RAP
The Floppy Disk cannot be read.
INITIAL ACTION
Note: The Floppy Disk must be a DOS format.
Load a different floppy and try to read it.
If the floppy still cannot be read, check the
following for a good connection:
• CN102 between the Floppy drive and the
ESS. (BSD 13 in Section 7).
• CN103 the flat cable between the Floppy
drive and the ESS. (BSD 13 in Section 7).
If the problem still exists, replace the Floppy
Drive before replacing the ESS PWB.
F2 DISK I/O ERROR (FLOPPY) RAP
The Floppy Disk cannot be read.
INITIAL ACTION
Note: The Floppy Disk must be a DOS format.
Load a different floppy and try to read it.
If the floppy still cannot be read, check the
following for a good connection:
• CN102 between the Floppy drive and the
ESS. (BSD 13 in Section 7).
• CN103 the flat cable between the Floppy
drive and the ESS. (BSD 13 in Section 7).
If the problem still exists, replace the Floppy
Drive before replacing the ESS PWB.
F3 ACTION FAILED (FLOPPY) RAP
The Floppy Disk cannot be accessed.
INITIAL ACTION
Note: The Floppy Disk must be a DOS format.
Load a different floppy and try to read it.
If the floppy still cannot be read, check the
following for a good connection:
• CN102 between the Floppy drive and the
ESS. (BSD 13 in Section 7).
• CN103 the flat cable between the Floppy
drive and the ESS. (BSD 13 in Section 7).
If the problem still exists, replace the Floppy
Drive before replacing the ESS PWB.
STATUS INDICATOR RAPs2/99
F1, F2, F32-12 DocuPrint C55/C55mp/[NC60]
H1 HARD DISK ERROR RAP
The Hard Disk cannot be read.
C55/C55mp
NOTE: If no hard disk is installed on this
printer, print a Settings page (Off Line, Print,
Settings) to record the customer network
settings. Tell the customer that you are going
to do a factory reset and they will need to
reinstall the printer on their network. Perform
a Factory Reset (Off Line, Setup, Factory
Reset).
[NC60]
NOTE: If no hard disk is installed on this
printer, print a Config. sheet (Menu Up to
Service Menu, Item Up to Config Sheet,
Enter) to record the customer network
settings. Tell the customer that you are going
to do a factory reset and they will need to
reinstall the printer on their network. Perform
a Factory Reset. Power Off. Press and hold
On Line and Enter. Switch the power on.
Continue holding the On Line and Enter keys
until the display indicates Power On Version
X.XX, then release the keys. This will enable
the Reset Menu. Menu Up until Reset Menu,
Item Up until Factor Defaults, Value Up until
Yes, then press Enter.
INITIAL ACTION
Switch the power off wait 10 seconds and
switch the power on. This will force the ESS to
retry reading the Hard Disk.
If the Hard Disk still cannot be read, check the
following:
•(C55/C55mp)
Check the Hard Disk to ensure that the
new Relay Interface PWB is installed.
Look for a small PWB mounted to the left
of the hard drive.
• All Printers, check for a good connection
between the Hard Disk and the ESS
(CN101). (BSD 13 in Section 7).
If the problem still exists, replace the Hard
Disk before replacing the ESS PWB.
H2 HARD DISK CONTROLLER
ERROR RAP
The Hard Disk Controller has failed.
INITIAL ACTION
Switch the power off wait 10 seconds and
switch the power on. Retry reading the Hard
Disk.
If the Hard Disk still cannot be read, check the
following for a good connection :
• Between the Hard Disk and the ESS
(CN101). (BSD 13 in Section 7).
If the problem still exists, replace the ESS
PWB.
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-13 H1, H2
H3 HARD DISK FULL RAP
The Hard Disk is full.
INITIAL ACTION
Switch the power off wait 10 seconds and
switch the power on. This will force the ESS to
retry reading the Hard Disk.
If the Hard Disk still does not write, have the
customer remove some of the files from the
Hard Disk.
H4 REFORMAT HARD DISK RAP
The Hard Disk needs to be formatted.
INITIAL ACTION
Switch the power off wait 10 seconds and
switch the power on to retry reading the Hard
Disk.
If the H4 occurs again, reformat the hard disk:
STATUS INDICATOR RAPs2/99
H3, H42-14 DocuPrint C55/C55mp/[NC60]
J1 ADD YELLOW TONER RAP
The yellow toner concentration sensor has
detected low yellow toner in the yellow
developer assembly. When this occurs, the
Printer will display “Adjusting Print Quality” and
attempt to tone up.
NOTE: If a new color developer housing has
been installed, make sure the 3 seals have
been removed from the left side of the
housing.
INITIAL ACTION
Check with the customer to see if they have
already added Yellow Dry Ink. Add Yellow Dry
Ink, if required.
Adding too much toner can cause the toner to
“cake” and not be dispensed.
(C55/C55mp)
Put the printer in the Off Line mode.
Select the SERVICE Menu and print a
Diagnostic Test Sheet.
Determine the Engine Software version from
the Diagnostic Test Sheet. If the Software
level is Version 66, replace the PCU PWB.
All Printers, switch the power off wait 10
seconds and switch the power on. Allow the
Printer to try to tone up to recheck for the fault.
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
MOTOR TEST program and Press FormFeed [1] to switch on the motors while
observing the Color Toner Motor.
The Color Toner Motor is rotating normally.
A
A
YN
Refer to BSD 9.11 in Section 7 and
troubleshoot the Color Toner Motor lines
(CN116-1, 2) for an open or a short to
ground.
If no wiring problem exists, replace the
PCU PWB. If the problem still exists,
replace the Color Toner Motor.
Exit from diagnostics .
Set up the meter to read +24 VDC. Measure
between CN115-16 (+) and ground (−).
Switch the power off wait 10 seconds and
switch the power on while monitoring the meter.
The meter swings from +24 VDC to 0.
YN
Go to BSD 9.10 in Section 7 and trouble-
shoot the Yellow Toner Solenoid signal
and +24 VDC Interlocked (CN115-16, 15)
for an open.
If no open exists, replace the PCU PWB.
If the problem still exists, replace the
Yellow Toner Solenoid.
Check the Yellow Dispense Shaft to see if it
rotates when the Solenoid energizes. If not,
look for a mechanical problem (gears etc.).
Check the ground to the Yellow Toner
Concentration Sensor (CN118-4 to CN1009-7)
BSD 9.10.
If the ground is OK, replace the PCU PWB.
Color
Toner
Motor
Y Disp.
Shaft
01/02
2/99STATUS INDICATOR RAPs
DocuPrint C55/C55mp/[NC60]2-15 J1
J2 ADD MAGENTA TONER RAP
The magenta toner concentration sensor has
detected low magenta toner in the magenta
developer assembly. When this occurs, the
Printer will display “Adjusting Print Quality” and
attempt to tone up.
NOTE: If a new color developer housing has
been installed, make sure the 3 seals have
been removed from the left side of the
housing.
INITIAL ACTION
Check with the customer to see if they have
already added Magenta Dry Ink. Add Magenta
Dry Ink, if required.
Adding too much toner can cause the toner to
“cake” and not be dispensed.
(C55/C55mp)
Put the printer in the Off Line mode.
Select the SERVICE Menu and print a
Diagnostic Test Sheet.
Determine the Engine Software version from
the Diagnostic Test Sheet. If the Software
level is Version 66, replace the PCU PWB.
All Printers, switch the power off wait 10
seconds and switch the power on. Allow the
Printer to try to tone up to recheck for the fault.
PROCEDURE
Enter IOT normal diagnostics. Scroll to the
MOTOR TEST program and Press FormFeed [1] to switch on the motors while
observing the Color Toner Motor.
The Color Toner Motor is rotating normally.
A
A
YN
Refer to BSD 9.11 in Section 7 and
troubleshoot the Color Toner Motor lines
(CN116-1, 2) for an open or a short to
ground.
If no wiring problem exists, replace the
PCU PWB. If the problem still exists,
replace the Color Toner Motor.
Exit from diagnostics.
Set up the meter to read +24 VDC. Measure
between CN115-14 (+) and ground (−).
Switch the power off wait 10 seconds and
switch the power on while monitoring the meter.
The meter swings from +24 VDC to 0.
YN
Go to BSD 9.10 in Section 7 and trouble-
shoot the Magenta Toner Solenoid signal
and +24 VDC Interlocked (CN115-14, 13)
for an open.
If no open exists, replace the PCU PWB.
If the problem still exists, replace the
Magenta Toner Solenoid.
Check the Magenta Dispense Shaft to see if it
rotates when the Solenoid energizes. If not,
look for a mechanical problem (gears etc.).
Check the ground to the Magenta Toner
Concentration Sensor (CN118-5 to CN1009-
21) BSD 9.10.
If the ground is OK, replace the PCU PWB.
Color
Toner
Motor
M Disp.
Shaft
01/02
STATUS INDICATOR RAPs2/99
J22-16 DocuPrint C55/C55mp/[NC60]
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