When Replacing The Scnt Board; Fixing System; Checking The Nip Width Of The Lower Fixing Roller; Service Tools - Canon MF8100 Series Service Manual

Chapter 5
After PWM adjustment, the machine should start initialization sequence.

5.1.3.2 When Replacing the SCNT Board

The flash ROM mounted on the SCNT board retains PWM adjustment settings that are specific to individual laser/scanner units, requiring you to update the settings
whenever you have replaced a laser/scanner unit.
If you have replaced the SCNT board, be sure to go through the following steps:
1.Initializing the ROM
1) Press [MENU]; then, press [#] to start service mode.
2) Move to [#CLEAR], and press [OK].
3) Move to [ALL], and press [OK] to initialize the ROM.
2. PWM Adjustment
1) Press [MENU], an then press [#] to start service mode.
2) Go to [#TEST MODE]; then, press [OK] and [*] to start [ADJUST TEST].
3) Press [1], and see that [OK] is indicated.
At the end of PWM adjustment, the machine starts its initialization sequence.

5.1.4 Fixing System

5.1.4.1 Checking the Nip Width of the Lower Fixing Roller

The fixing unit is not designed to allow the adjustment of the pressure (nip width); however, incorrect nip width can cause fixing defects.
Check the nip width by following the procedures below. If the nip width does not satisfy specifications, replace the fixing unit.
1) Make an all-black print of A4 size using the cartridge of this printer by operating external devices, and take the print to the customer's site.
2) Place the all-black print facing down on the Cassette.
3) Select face-up delivery.
4) Press the test print switch.
5) Open the delivery door immediately after the leading edge of the print has come out to the face-up tray. Take out the print from the printer after 10 seconds from
turning off the power switch.
6) Measure the width of the glossy band across the paper and check that it meets the following requirements shown in figure.
- Center (a): 6 to 7.5 mm
- Difference between right/left and center (b - a, c - a): 0.6 mm or less
- Difference between right and left (|b - a|): 0.5 mm or less

5.2 Service Tools

5.2.1 Standard Tools

The table below lists the standard tools required for servicing the printer.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
5-2
Paper Feed
Direction
Tool name
Tool case
Jumper wire
Clearance gauge
Compression spring scale
Phillips screwdriver
Phillips screwdriver
Phillips screwdriver
Phillips screwdriver
Flat-blade screwdriver
Precision flat-blade screwdriver set
Allen wrench set
File, fine
Allen (hex) screwdriver
Diagonal cutting pliers
Needle-nose pliers
Pliers
Retaining ring pliers
Crimper
Tweezers
Ruler
10mm
c
a
Center of Paper
b
10mm
About
30
mm
F-5-3
T-5-1
Tool No. Remark
TKN-0001 With a clip
TKN-0069 0.02 to 0.3 mm
CK-0057 0 to 600 g for checking the cassette spring pressure
CK-0058
M4, M5 Length : 363 mm
CK-0101
CK-0104 M3, M4 Length: 155 mm
CK-0105 M4, M5 Length: 191 mm
CK-0106 M4, M5 Length: 85 mm
CK-0111
CK-0114 6-piece set
CK-0151 5-piece set
CK-0161
CK-0170 M4 Length: 107 mm
CK-0201
CK-0202
CK-0203 Applied to the axis ring
CK-0205
CK-0218
CK-0302 Employed to measure 150 mm
CK-0303
0008-4973
0008-1739
0008-1750