3-90 Xerox Internal Use Only Phaser 6500/WorkCentre 6505 Service Manual
Error Messages and Codes
IOT Over Heat Stop
Applicable Error Code
• 042-700
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack Map References
■ Humidity Sensor (SFP PL8.2.7; MFP
PL8.1.10)
■ MCU Board (SFP PL8.2.13; MFP
PL8.3.6)
■ MFP: Left Side Harness Assy (PL
3.1.18)
■ SFP: Humidity Harness Assy
(PL9.1.6)
■ “Map 3 - SFP IP Board, LVPS, and Drive”
on page 10-8
■ “Map 4 - SFP MCU Board” on
page 10-9
■ “SFP Xerographics” on page 10-30
■ “Map 8 - MFP LVPS, IP Board, and
Drive” on page 10-17
■ “Map 9 - MFP MCU Board and HVPS”
on page 10-18
■ “MFP Xerographics” on page 10-43
Troubleshooting Procedure
Step Actions and Questions Yes No
1 Check the connections between the
MCU Board and Humidity Sensor.
Are P/J20 and P/J201 connected
surely?
Go to step 3. Reconnect the
connector(s) P/
J20 and/or P/
J201 surely,
then go to
step 2
2 Does the error still occur when the
power is turned Off and On?
Go to step 3. Complete.
3 Disconnect P/J20 from the MCU
Board.
Disconnect P/J201 from the Humidity
Sensor.
Is each wire of P/J20 <=> P/J201
continuous?
Go to step 4. SFP: Replace
the Humidity
Harness Assy.
(PL 9.1.6)
MFP: Replace
the Left Side
Harness Assy.
(PL 3.1 18)
4 Disconnect P/J20 on the MCU Board.
Is the voltage across ground <=> J20-4
on the MCU Board, about +5VDC?
Replace the
Humidity
Sensor. (SFP,
page 8-130;
MFP,
page 8-153)
Replace the
MCU Board.
(SFP,
page 8-138;
MFP,
page 8-160)
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