Canon NP6251 Service Manual page 12

E. Reciprocating Mechanism for
the Upper Separation Claw ...........6-11
F. SSR Error Detection Circuit for
the Fixing Heater ...........................6-12
G. Locking Operation (fixing/feeding
unit)................................................6-14
H. Error Detection Circuit ...................6-15
1. Outline ......................................6-15
2. Scanning Lamp Error
Activation Detection Circuit ......6-15
3. Fixing Heater Error Activation
Detection Circuit .......................6-16
4. Motor Error Rotation
Detection Circuit .......................6-17
II. DISASSEMBLY AND ASSEMBLY......6-18
A. Fixing Assembly ............................6-19
1. Construction .............................6-19
2. Locking Mechanism..................6-19
3. Removing the Fixing Cleaning
Belt ...........................................6-20
4. Installing the Fixing Cleaning
Belt ...........................................6-22
5. Removing the Upper Fixing
Unit ...........................................6-23
6. Removing the Fixing Heater.....6-25
7. Installing the Fixing Heater.......6-27
8. Removing the Fixing Upper
Roller ........................................6-27
9. Installing the Upper Fixing
Roller ........................................6-29
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
I. CONTROL PANEL .............................7-1
A. Outline ...........................................7-1
B. Operation.......................................7-1
1. Data Communication................7-1
2. LCD Processing .......................7-2
3. Automatic Control of LCD
Contrast ....................................7-4
4. Touch Switch Inputs .................7-5
II. FANS ..................................................7-6
III. POWER SUPPLY ...............................7-9
A. Outline of Power Supply................7-9
B. Power Supply Circuit .....................7-10
C. Date/Time Display Power Supply..7-12
IV. DISASSEMBLY AND ASSEMBLY......7-13
A. External Covers .............................7-14
1. Removing the Front Door.........7-15
2. Removing the Inside Upper
Cover ........................................7-16
3. Removing the Fixing/Feeding
Unit Front Cover .......................7-17
4. Removing the Rear Cover........7-17
5. Sliding Out the Hopper
Assembly ..................................7-18
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10.Removing the Thermal Switch..6-30
11. Removing the Main Thermistor
(TH1) ........................................6-30
12.Removing the Lower
Separation Claw Assembly ......6-31
13.Removing the Lower Roller......6-32
14.Removing the Upper
Separation Claw .......................6-32
15.Adjusting the Nip (tightening
the pressure adjusting nut).......6-33
16.Adjusting the Fixing Clutch.......6-34
17.Removing the Sub Thermistor
(TH2) ........................................6-35
B. Delivery Assembly .........................6-36
1. Construction .............................6-36
2. Removing the Delivery Upper
Guide (fixing/delivery
assembly) .................................6-36
3. Removing the Fixing/Feeding
Assembly Locking Assembly....6-37
4. Removing the External
Delivery Roller ..........................6-37
5. Removing the External Delivery
Paper Sensor and the Internal
Delivery Paper Sensor .............6-39
6. Removing the Fixing Assembly
Outlet Paper Sensor
Assembly ..................................6-39
7. Removing the Internal Delivery
Assembly Roller .......................6-40
6. Removing the Process Unit......7-18
7. Installing the Process Unit........7-21
B. Control Panel.................................7-22
1. Removing the Control Panel
from the Copier ........................7-22
2. Removing the Control Panel
PCB ..........................................7-25
3. Removing the Touch Panel ......7-26
4. Removing the Control Panel
Controller (CPU) PCB ..............7-27
C. Door Switch Assembly ..................7-28
1. Removing the Front Door
Switch Assembly ......................7-28
2. Removing the Multifeeder
Door Switch Assembly .............7-28
3. Installing the Drum Heater
Switch .......................................7-29
D. Fan Unit .........................................7-30
1. Removing the Scanner
Cooling Fan ..............................7-30
2. Removing the Exhaust Fan......7-30
3. Removing the Fixing Heat
Exhaust Fan .............................7-31
CANON NP6350/NP6251 REV.0 JULY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON)