Xerox Phaser 7400 Service Manual

Error Messages and Codes 3-93
RH Sensor Failure
Applicable Status Code:
Code T30: Humidity Sensor Failure
Code T31: Condensation detected in the printer.
Initial Actions:
■ Cycle the printer's power.
■ If the problem persists follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Temp/Humidity Sensor, PL8.1.80
■ ENV Harness, PL8.1.81
■ Engine Control Board, PL1.1.4
■ Print Engine Map 2 (page 10-5)
■ Print Engine Map 9 (page 10-12)
■ Print Engine Front Sensor Board (1/2) (page 10-26)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Test the Temp/Humidity Sensor.
1. Run the Service Diagnostics Ambient
Temp/Hum Sensor test.
2. Verify proper operation by blowing on
the sensor.
Is the sensor operating correctly?
Replace the Engine
Control Board
(
page 8-112).
Go to Step 2.
2
Replace the Temp/Humidity Sensor.
Does the error persist?
Go to Step 3. Complete.
3
Check the ENV harness connection.
Is the ENV Harness connected to the Front
Sensor Board?
Go to Step 4. Reconnect the
harness.
4
Check all pins on the ENV Harness
PL8.1.81 for continuity.
1. Disconnect ENV and P/J420.
2. Check continuity between ENV <=>
J420.
Go to Step 5. Replace the ENV
Harness.
5
Check the Temp/Humidity Sensor signal.
Is there voltage present at FSNS-15 when
the sensor is active?
Go to Step 6. Replace the Front
Sensor Board
(
page 8-150).
6
Check all pins on the FSNS Harness
PL4.2.98 for continuity.
1. Disconnect FSNS.
2. Check continuity on all contacts.
Replace the Motor
Driver Board
(
page 8-141).
Replace the FSNS
Harness.

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