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Phaser 7700 Color Laser Printer Service Manual
2-39
Read Fuser
Fuses
Fuse 1 is Open
Fuse 2 is Open
Fuse 3 is Shorted
50 page fuse
90 day fuse
Mis-Use fuse
Open indicates Fuse is blown.
Accum MOB
Sensor
MOB sensor is L
Accumulator Mark-On-Belt
Engineering use only
Belt Edge
Sensor
Edge is nnn (current value)
Approximately 500 (+/- 25)
Engineering use only
BTR Sensors
BTR Y is L
BTR M is L
BTR C is L
BTR K is L
2nd BTR is L
H = Error
L = No error
ADC Sensors
ADC is H
ADC = Automatic Density Correction
Engineering use only.
Go to ADC Output check under
adjustments and calibration.
Toner Waste
Cartridge
Waste Cartridge presence is H
Waste Cartridge full is H
All door switches must be closed.
H = Present or full
L = Not present or not full
Tray Sensors
Tray 1
Do you want auto media lift?
Yes
No
Tray 1: SW1-4:HHHL-<Letter>
Level: H
NoPaper: L
Tray 2 - <same as tray 1>
Tray 3 - <no data available if
HCF is installed>
Tray 4 - <same as tray 3>
The four switch pattern indicates the
media size.
L = Tray not lifted
H = Tray lifted
H = Paper not present
L = Paper present
Note: Level 6 entries for Trays 2-4
follow the same pattern as for Tray 1.
MPT Sensors
MPT No Paper is L -
engineering use only
MPT size is XXX
MPT = Multi-Purpose Tray
Range (0 - 1000)
i.e. Letter LEF approx. 180
i.e. Letter SEF approx. 460
HCF Sensors
No HCF Attached
or
HCF Path 1 is L
HCF Path 2 is| L
High-Capacity Feeder
Engineering use only
ATC Sensor
ATC 1 is nnn
ATC 2 is nnn
ATC 3 is nnn
ATC 4 is nnn
ATC = Automatic Toner Calibration
Value range (0 - 1000)
Engineering use only
Table 2-2 Service Diagnostics Test Menu Functions (cont'd.)
Test
Front Panel Display
Test Operation, Results and
Function
Definition
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