January 2010
2-30
Phaser 7760 Color Laser Printer
004-323, 004-331
Revised
Status Indicator RAP’s
004-331 Engine Control Board Fuse F1 Open
Fuse F1 on the Engine Control Board is open.
Troubleshooting References
Troubleshooting Procedure
NOTE: A 006-372 (Polygon Motor Failure) error code can be displayed if Fuse F1 on the
Engine Control Board opens during the printing process. After power is cycled, the 004-331
error code should be displayed.
Fuser F1 on the Engine Control Board provides circuit protection through the following P/Js.
Verify that there ar e no short circuits or components that would cause this Fuse to open again
if replaced.
• P400, pin 1
• P402, pin 6
• P403, pin B1
• P404, pin A6, pin A8, pin A10, pin A12, pin B2
6 Is the frequency between J535-7 and
ground between 1 KHz and 1.3KHz?
Check for an open
circuit between
J235-8 and J535-2.
Refer to Section 7,
Xerographics - Fig-
ure 2 to trouble-
shoot missing +3
VDC.
Table 2 Procedure
Step Actions and Questions Yes No
Table 1 References
Applicable Parts Parts List Wiring and Plug/Jack References
Engine Control Board
(MCU PWB)
PL 13.1 Section 7, Engine Control Board (MCU PWB) Plug/
Jack Locations - Figure 15
Block Schematics and Wiring Schematics - Chain 13
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