Canon LBP5000 Series, Service Manual

Page: 72 / 162

Chapter 2
2-38
5) write/read operation to and from EEPROM
6) control of memory controller
c. Reset IC (IC6)
The reset IC serves to reset the CPU and ASIC at power-on with reference to the +3.3V voltage.
d. EEPROM(IC5)
The EEPROM is used to store various backup data.
2.8.2.3 Fan/Motor Control
0010-6173
LBP5000
The DC controller PCB serves to control 4 motors.
The following shows the specifications of the various motors used in the machine:
T-2-8
2.8.2.4 Fan/Motor Control
0015-7827
LBP5100
The DC controller PCB serves to control 5 motors.
The duplexing driver PCB controls 2 motors.
The following shows the specifications of the various motors used in the machine:
- DC controller PCB
T-2-9
- Duplexing driver PCB
T-2-10
2.8.2.5 Main Motor Fault Detection
0010-6174
LBP5000 / LBP5100
The CPU will identify any of the following conditions as the presence of a fault in the main motor, and will stop the printer engine and, at the same time, indicate
'E012' in the status window.
1) Main Motor Start-Up Fault (E012-0000)
The interval of the main motor speed detection signal (/MAINMFG) is not as specified 1000 msec after the start of the main motor drive.
2) Main Motor Rotation Fault (E012-0001)
The /MINMFG signal occurs at the specified intervals, but thereafter deviates continuously for 100 msec.
2.8.2.6 Fan Motor Fault Detection
0010-6178
LBP5000 / LBP5100
The CPU will identify any of the following conditions as the presence of a fault in the main motor, and will stop the printer engine and, at the same time, indicate
'E806' in the status window.
1) While the fan motor is rotating, the fan lock detection signal (FANLCK) is continuously High for about 10 sec or more.
2.8.3 Video Controller PCB
2.8.3.1 Outline
0010-8662
LBP5000 / LBP5100
The video controller receives print information from external devices (e.g., host computer) by way of interface cables. The information contains a CAPT command
used to communicate printer status and printer-specific characteristics and dot data, which is the result of conversion of print data by the host computer.
The data is sent to the DC controller circuit for control of laser diode activation.
If properly connected with a bi-directional interface, an external device may be used to check the printer status.
Name Function Type
Direction of
rotation
Fault detection
Motor
Main motor
(M1)
Drives the ETB, photosensitive drum,
and developing cylinder.
DC motor Clockwise Yes
Fixing/delivery motor
(M2)
Drives the pressure roller, delivery
roller, and fixing assembly release
mechanisms.
Stepping motor
Clockwise/
counterclockwise
No
Pickup motor(M3)
Drives the pickup roller and registration
roller
Stepping motor Clockwise No
Fan
(FM1)
Cools the area around the cartridges. DC motor - Yes
Name Function Type
Direction of
rotation
Fault detection
Motor
Main motor
(M1)
Drives the ETB, photosensitive drum,
and developing cylinder.
DC motor Clockwise Yes
Fixing/delivery motor
(M2)
Drives the pressure roller, delivery
roller, and fixing assembly release
mechanisms.
Stepping motor
Clockwise/
counterclockwise
No
Pickup motor(M3)
Drives the pickup roller and registration
roller
Stepping motor Clockwise No
Cartridges fan Cools the area around the cartridges. DC motor - Yes
Fixing fan
(FM2)
Cools the area around the fixing unit. DC motor - Yes
Name Function Type
Direction of
rotation
Fault detection
Motor
Reverse motor
(M7)
To drive reverse roller Stepping motor
Clockwise/
counterclockwise
No
Duplexing feed motor
(M6)
To drive duplexing feed roller Stepping motor Clockwise No