January 2010
2-47
Phaser 7760 Color Laser Printer
004-358, 004-361
Status Indicator RAP’s
Revised
004-358 Controller Communication Fail
Failure occurred in Printer Communication.
Troubleshooting References
Troubleshooting Procedures
004-361 Imaging Unit Motor Fail
Imaging Unit Motor has failed.
Troubleshooting References
Troubleshooting Procedure
Table 1 References
Applicable Parts Parts List Wiring and Plug/Jack References
Accumulator Belt PL 5.2 Section 7, IBT Belt Assembly Plug/Jack Locations -
Figure 11
I/F PWB PL 9.1 Section 7, I/F PWB, Main Motor, LVPS T11 Plug/Jack
Locations - Figure 16
Engine Control Board
(MCU PWB)
PL 13.1 Section 7, Engine Control Board (MCU PWB) Plug/
Jack Locations - Figure 15
Table 2 Procedure
Step Actions and Questions Yes No
1 1. Cycle power to the printer to clear the
error.
2. Turn the printer power Off.
3. Remove the Image Processor Board.
4. Inspect the orange ribbon cable
between the Relay Board and Engine
Control Board.
5. Is the connector fully seated and free
from damage?
Replace in the following order:
1. Image Processor Board (REP 1.12)
2. Electrical Chassis Assembly (REP
1.3)
3. Engine Control Board (MCU PWB)
(REP 1.2)
Table 1 References
Applicable Parts Parts List Wiring and Plug/Jack References
Imaging Unit Drive Motor PL 1.1 Section 7, I/F PWB, Main Motor, LVPS T11 Plug/Jack
Locations - Figure 16
I/F PWB PL 9.1 Section 7, I/F PWB, Main Motor, LVPS T11 Plug/Jack
Locations - Figure 16
Table 2 Procedure
Step Actions and Questions Yes No
1 1. Enter Service Diagnostics Menu:
Printer Menu > Troubleshooting >
Service Tools > Printer Status Page
> hold the Up and Down buttons
simultaneously > Run Service Diag-
nostics > OK. Perform the Imaging
Unit Motor test.
2. Does the Motor operate correctly?
Go to step 7. Go to step 2.
2 Is the voltage at J535-5 +5 VDC? Go to step 3. Replace the I/F
PWB (REP 1.8).
3 Is the voltage at J535-10 +24 VDC? Go to step 4. Replace the I/F
PWB (REP 1.8).
4 1. Enter Service Diagnostics Menu.
2. While running the Imaging Unit Motor
test, check the voltage at J535-1 and
J535-2.
3. Is the voltage 0 VDC while the test is
running?
Go to step 5. Replace the I/F
PWB (REP 1.8).
5 Is the frequency between J535-4 and
ground between 1 KHz and 1.3 KHz?
Replace the Imag-
ing Unit Drive Motor
(REP 4.4).
Go to step 6.
6 1. Check for a short to ground at J535-4.
2. Is the wire grounded?
Repair or replace
the wiring harness.
Replace the I/F
PWB (REP 1.8).
7 1. Enter Service Diagnostics Menu.
2. While running the Imaging Unit Motor
test, check the voltage at J535-7.
3. Is the voltage +5 VDC while the test is
running?
Replace the Imag-
ing Unit Drive Motor
(REP 4.4).
Replace the I/F
PWB (REP 1.8).
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