Xerox Phaser 7400 Service Manual

Error Messages and Codes 3-109
[C][M][Y][K] Imaging Unit Failure
The Drum Phase Sensor for the named Imaging Unit indicates that the drum is out of
position.
Applicable Status Codes:
Code U26: Yellow Imaging Unit Failure
Code U27: Magenta Imaging Unit Failure
Code U28: Cyan Imaging Unit Failure
Code U29: Black Imaging Unit Failure
Initial Actions:
■ Reseat the indicated Imaging Unit
■ Cycle the printer's power.
■ If the problem persists follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ [C][M][Y][K] Imaging Unit, PL1.1.23
■ [C][M][Y][K] I/U Motor, PL2.1.8
■ I/U Sensor Board, PL5.1.21
■ I/U Lift Uplink, PL6.1.4, PL5.1.11
■ Print Engine Map 5 (page 10-8)
■ Print Engine Map 8 (page 10-11)
■ Print Engine Imaging Unit Sensor Board (page 10-41)
■ Print Engine Motor Driver Board (3/6) (page 10-33)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Check the following for evidence of fault or
damage:
■ Imaging Unit
■ Imaging Unit Drive Gears
■ Imaging Unit Sensor Board
■ Imaging Unit Lift Uplink
Is there any damage?
Replace any
damaged parts.
Go to Step 2.
2
Test the Drum Phase Sensor.
Run the Service Diagnostics Drum Phase
Sensor test for the indicated Imaging Unit.
Does the sensor function correctly?
Go to Step 5 Go to Step 3.
3
Check the I/U Phase signal:
CIDPHASE at CTG1-18
MIDPHASE at CTG1-20
YIDPHASE at CTG1-22
KIDPHASE at CTG1-24
Does the Drum Phase signal change when
the sensor is blocked?
Go to Step 4. Replace the I/U
Sensor Board
(
page 8-142).

Xerox Phaser 7400 Specifications

General

Color	Yes
Print technology	Laser
Maximum resolution	600 x 1200 DPI
Time to first page (black, normal)	12 s
Print speed (black, normal quality, A4/US Letter)	40 ppm
Print speed (color, normal quality, A4/US Letter)	36 ppm
Storage media	HDD
Internal memory	512 MB
Processor model	PowerPC
Maximum internal memory	1 MB
Internal storage capacity	20 GB
Total input capacity	800 sheets
Maximum input capacity	3000 sheets
Paper tray 2 input capacity	350 sheets
Auto document feeder (ADF) input capacity	1650 sheets
Maximum print size	297 x 420 mm
Paper tray media types	Envelopes, Labels, Transparencies
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Letter (media size), Statement (140 x 216mm), Legal (media size)
Maximum ISO A-series paper size	A3
Power requirements	100-240V, 50/60Hz
Networking features	Fast Ethernet
Supported media weight(s)	270 g/m²
Maximum operating temperature range (T-T)	10 - 32 °C
Certification	FCC p.15 A, CE
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	-4 - 140 °F
Storage relative humidity (H-H)	10 - 95 %
Operating relative humidity (H-H)	20 - 80 %
Maximum duty cycle	150000 pages per month

Weight and Dimensions

Dimensions (WxDxH)	1438 x 623 x 975 mm