Xerox Phaser 7760 Service Manual page 221

010-352 Main Heater Warm Up
The temperature did not reach the Ready temperature.
NOTE: If this fault is declared 3 times succession, printing will be disabled. To clear this condi-
tion, perform Clear Tech Rep Faults from the Service Tools menu.
Troubleshooting References
Table 1 References
Applicable Parts Part List
Engine Control Board PL 13.1
(MCU PWB)
Fuser PL 7.1
AC Power Chassis Assy. PL 9.2
Troubleshooting Procedure
Table 2 Procedure
Step Actions and Questions
1 Turn off the power, remove the Fuser, and
allow it to cool down.
Measure the resistance between the Fuser
connector P600-1 and P600-12 on the
Fuser Assembly (pin numbers are marked
on tapered edge of P600 housing. Is less
than 20 ohms measured?
2 Measure the resistance between the Fuser
connector pins P600-4 -and P600-5. Is the
resistance between 30 and 190 ohms?
3 Reinstall the Fuser and switch on the
power.
Measure the voltage between P/J48 and P/
J46 on the AC Drive PWB (PL 9.2). Is it AC
Line Voltage?
4 Go to Figure 1 and Figure 2. Check the
wires and connectors for continuity and that
they are not grounding to the frame.
Is the check OK?
5 Measure the voltage at P/J590-5 on the AC
Drive PWB (PL 9.2).
Is it less than 1 VDC?
6 Go to Figure 2. Check the wires and con-
nectors for continuity and that they are not
grounding to frame.
Is the check OK?
Revised
Phaser 7760 Color Laser Printer
Wiring and Plug/Jack References
Section 7, Engine Control Board (MCU PWB) Plug/
Jack Locations - Figure 15
Section 7, Fuser Assembly Plug/Jack Locations -
Figure 6
Yes No
Go to step 2. Replace the Fuser
(PL 7.1).
Go to step 3. Replace the Fuser
(PL 7.1).
Go to step 4. Go to step 5.
Replace the Fuser Repair the wiring
(PL 7.1). harness.
Go to step 7. Go to step 6.
Replace the Engine Repair the wiring
Control Board harness.
(MCU PWB) (REP
1.2).
Step Actions and Questions
7 While the Fuser is warming up, is +5VDC is
measured at P/J590-2 on the AC Drive
PWB (PL 9.2)?
8 Go to Figure 2. Check the wires and con-
nectors for continuity and that they are not
grounding to frame.
Is the check OK?
Figure 1 010-352, 010-353 Fuser Front and Rear Thermistor
January 2010
2-185
Table 2 Procedure
Yes No
Replace the AC Go to step 8.
Power Chassis
Assembly (PL 9.2).
Replace the Engine Repair the wiring
Control Board harness.
(MCU PWB) (REP
1.2).
Status Indicator RAP's
010-352