Phaser 4500/4510 Service Manual 3-25
Error Messages and Codes
Phaser 4510 Error Message Summary
Control Panel Message Diagnostic Message
Engine
Errors
Jam 
Errors
Procedure
to Use
“Engine Logic Board 
NVRAM Failure\ 
Press ?”
U6 NVM fail/ Power Off 59 — Go to 
page 3-33.
“Main Motor Failure\ 
Press ?”
U1 Motor Fail/ Power 
Off
55 — Go to 
page 3-28.
“Laser Unit Failure\
Press ?”
Laser Fails at warm-up
U2-1 Laser Fail / 
Power Off
56 — Go to 
page 3-29
“Laser Unit Failure\
Press ?”
Laser Fails Motor 
Speed
U2-2: Laser Fail/Power 
Off
56 — Go to 
page 3-29
“Laser Unit Failure\
Press ?”
LD Power is high 
U2-3: Laser Fail/Power 
Off
56 — Go to 
page 3-29
“Laser Unit Failure\
Press ?”
LD Power is low
U2-4: Laser Fail/Power 
Off
56 — Go to 
page 3-29
“Fuser Failure\Press ?” Fuser High Temp
U4-1 Fuser Fail/ Power 
Off
57 — Go to 
page 3-30
“Fuser Failure\ Press ?” Fuser Low Temp
U4-2: Fuser Fail/Power 
Off
57 — Go to 
page 3-30.
“Fuser Failure\ Press ?” Fuser Overheat in 
Stand-by
U4-3: Fuser Fail/Power 
Off
57 — Go to 
page 3-30.
“Fuser Failure\Press ?” Fuser Fails at warm-up
U4-4: Fuser Fail/ 
Power Off
57 — Go to 
page 3-30.
“Fuser Failure\Press ?” Fuser Thermistor 
Failure
U4-5: Fuser Fail/ 
Power Off
57 — Go to 
page 3-30.
“Toner Is Low\ Press ?” J5: Toner Low — — Go to 
“Toner 
Sensor” on 
page 4-22
“Fan Failure\ Power Off 
Now\ Press ?”
Fatal Failure: Fan 
(Code U5)
58 — Go to 
page 3-31.
“Install Or Reseat Print 
Cartridge\ Press ?”
J3: Missing Print 
Cartridge
——Go to 
page 3-61.
“Replace Print Cartridge\ 
Press ?”
———Go to 
page 3-62.