Fuser/Exit Unit - DISASSEMBLY AND REPLACEMENT 1 Disassembly and Replacement of Covers

[ 2 ] Temperature detection section

4. DISASSEMBLY AND REPLACEMENT 1 Disassembly and Replacement of Covers

4.8 Fuser/Exit Unit

DISASSEMBLY AND REPLACEMENT 4 - 49

4.8 Fuser/Exit Unit

Notes:

1. Be sure to turn the power OFF and unplug the power cable during service.

2. When disassembling the fuser unit or replacing any parts in it, be sure that the wire harness is correctly set, and also be careful not to catch it between other parts.

a. Make sure that the terminal of the thermostat harness does not contact the metal plate.

b. Route the harness of the thermostat so that it is hooked on the notches of the rib.

c. Route the harnesses of the thermistor so that they are hooked on the housing as shown below.

Fig. 4-140

a

c

b

d. Route the AC harnesses so that they are hooked on the housing as shown below.

Fig. 4-141

e. When installing the cover of the fuser unit, make sure that the connector (harness) is not caught.

f. Route the harnesses of the fuser unit so that they are hooked on the frame as shown below.

d

AC harnesses AC harnesses

f

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DISASSEMBLY AND REPLACEMENT 4 - 51

g. Route the harness of the thermostat so that it is hooked on the notches of the rib.

Fig. 4-143

g

4.8.1 Fuser unit

Notes:

As the fuser unit is hot, power OFF and make sure that the fuser unit has cooled down sufficiently before removing.

If removing it while still hot, use gloves.

(1) Take off the right rear cover.

 P. 4-6 "4.1.9 Right rear cover"

(2) Disconnect 3 connectors [1] and release the harness from the harness guide.

Fig. 4-144

(3) Remove 2 screws.

Notes:

Note that the front side and back side screws are different from each other. Install the screws in their proper locations.

Front: Shoulder screw M3 x 6 Rear: M3 x 10

Fig. 4-145

[1]

Shoulder screw

M3 x 6 M3 x 10

4

DISASSEMBLY AND REPLACEMENT 4 - 53

4.8.2 Fuser unit cover/Guide

(4) Take off the fuser unit [2].

Notes:

1. Take note that the fuser unit is hot.

Particularly, the metal sheet of the entrance guide below the fuser unit is hot.

2. When removing the fuser unit, hold the positions shown in the figure.

3. When installing the fuser unit, hold the positions shown in the figure.

Fig. 4-146

Fig. 4-147

(1) Take off the fuser unit.

 P. 4-52 "4.8.1 Fuser unit"

(2) Place the fuser unit upside down.

Remove 1 screw and release the latch, take off the bias plate [1].

Fig. 4-148 [2]

[1]

(3) Remove 2 screws and then take off entrance guide [2].

Notes:

1. When removing the entrance guide, be careful not to scratch the fuser roller and pressure roller with the entrance guide edge.

Fig. 4-149

2. When installing the entrance guide, make sure that the part of the entrance guide shown in the figure is outside the fuser unit cover.

Fig. 4-150

3. Use the screw hole shown in the figure to attach the entrance guide.

Fig. 4-151

(4) Place the fuser unit facing the original direction, and remove the 2 screws.

[2]

4

DISASSEMBLY AND REPLACEMENT 4 - 55

4.8.3 Center heater lamp (LAMP1)

(5) Release 2 latches and then take off the fuser unit cover/guide [3].

Fig. 4-153

(1) Take off the fuser unit cover/guide

 P. 4-53 "4.8.2 Fuser unit cover/Guide"

(2) Disconnect 2 Faston terminals [1].

Fig. 4-154

Notes:

Do not remove the Faston terminal by force, but pull it out while pressing its lock.

Fig. 4-155 [3]

M3x5

M3x8

[1]

(3) Remove 2 screws.

Front side: M3x5 Rear side: M3x8

Fig. 4-156

(4) Take off the Center heater lamp [2] from the rear side.

Notes:

1. When removing the Center heater lamp, hold the Center heater lamp terminals.

2. Take care not to contaminate the Center heater lamp surface with fingerprints, dust or such.

Fig. 4-157

3. When installing the Center heater lamp, face the side with the notch on the terminal to the rear side.

Fig. 4-158

M3x8 M3x5

[2]

Rear

4

DISASSEMBLY AND REPLACEMENT 4 - 57

4.8.4 Side heater lamp (LAMP2)

(1) Remove the fuser cover/guide.

 P. 4-53 "4.8.2 Fuser unit cover/Guide"

(2) Remove 2 installation screws.

Front side: M3x5 Rear side: M3x8

Fig. 4-159

(3) Remove the side heater lamp [2] from the rear.

Notes:

1. Hold the connector of the side heater lamp while you remove it.

2. Be careful that the glass surface of the side heater lamp has no fingerprints or dirt on it.

Fig. 4-160

3. When attaching the heater lamp, align the plug with the notch of the dowel plate.

Fig. 4-161 M3x5

M3x8

[2]

Front

4.8.5 Base unit

4.8.6 Separation finger

(1) Take off the Center heater lamp.

 P. 4-55 "4.8.3 Center heater lamp (LAMP1)"

(2) Take off the Side heater lamp.

 P. 4-57 "4.8.4 Side heater lamp (LAMP2)"

(3) Take off the center thermistor, side thermistor, and edge thermistor.

 P. 4-63 "4.8.10 Center thermistor (THMS1) / Side thermistor (THMS2) / Edge thermistor (THMS3)"

(4) Place the fuser unit upside down.

Remove 2 screws.

Fig. 4-162

(5) Place the fuser unit facing the original direction, take off the base unit [1].

Fig. 4-163

(1) Take off the base unit.

 P. 4-58 "4.8.5 Base unit"

(2) Pull out the separation finger [1] from the groove.

(3) Remove the spring [2].

Notes:

There is five separation finger.

[1]

[2]

4

DISASSEMBLY AND REPLACEMENT 4 - 59

4.8.7 Pressure roller

Fig. 4-165

(1) Take off the base unit.

 P. 4-58 "4.8.5 Base unit"

(2) Remove 2 springs [1].

(3) Take off 2 pressure levers [2].

Fig. 4-166

(4) Take off 2 arms [3].

Fig. 4-167 [2]

[1]

[2]

[1]

[2]

[3]

4.8.8 Fuser roller/Fuser roller bushing

(5) While lifting up the rear side of the pressure roller [4], remove the bushing [5].

Fig. 4-168

(6) Take off the pressure roller [4] and bushing [6].

Fig. 4-169

(1) Take off the separation fingers.

 P. 4-58 "4.8.6 Separation finger"

(2) Take off the pressure roller.

 P. 4-59 "4.8.7 Pressure roller"

(3) Remove 1 gear [1].

[4]

[5]

[4]

[6]

[1]

4

DISASSEMBLY AND REPLACEMENT 4 - 61

4.8.9 Fuser center thermostat (THMO1) / Fuser front thermostat (THMO2)

(4) Remove 2 C-rings [2] and 1 gear [3].

Fig. 4-171

(5) Remove 2 fuser roller bushings [4] and then take off fuser roller [5].

Fig. 4-172

(1) Take off the base unit.

 P. 4-58 "4.8.5 Base unit"

(2) Remove 2 screws and then take off the fuser thermostat [1].

Fig. 4-173 [2]

[3]

[4]

[5]

[4]

[1]

Notes:

1. When attaching the fuser thermostat, place the round terminal of the cable above the thermostat terminal, and attach in the direction shown in the figure.

2. Make sure that the terminal of the thermostat harness does not contact the metal plate.

Fig. 4-174

Fig. 4-175

(3) Do not loosen the screw with the white markings that is holding the thermostat.

Fig. 4-176

4

DISASSEMBLY AND REPLACEMENT 4 - 63

4.8.10 Center thermistor (THMS1) / Side thermistor (THMS2) / Edge thermistor (THMS3)

4.8.11 Exit sensor (S3)

(1) Take off the fuser unit.

 P. 4-52 "4.8.1 Fuser unit"

(2) Remove each 1 screw of the thermistors, and then take off each thermistor [1] by releasing its harness out of the harness guide.

Fig. 4-177

Notes:

1. When installing the thermistors, do not mix up the installation positions of the center thermistor, the side thermistor and the edge thermistor by telling them apart by the length of their harnesses.

2. The thermistors have different front and back sides. When installing them, face the shiny side inside and insert the boss into the attaching fixture and install them.

3. Be careful not to deform the thermistor when installing the thermistor.

4. Is check that thermistors is in contact with

fuser roller. _{Fig. 4-178}

(1) Take off the fuser unit cover/guide.

 P. 4-53 "4.8.2 Fuser unit cover/Guide"

(2) Take off the guide [1].

(3) Remove the cover [2].

(4) Take off the actuator [3] and spring [4].

Fig. 4-180

Notes:

When installing the actuator, hook the spring as shown in the figure.

Fig. 4-181

(5) Release 3 latches and take off the exit sensor [5].

(6) Disconnect the connector.

Fig. 4-182 [3]

[4]

[2]

[5]

4

DISASSEMBLY AND REPLACEMENT 4 - 65

4.8.12 Exit roller

(1) Take off the tray rear cover.

 P. 4-4 "4.1.7 Tray rear cover"

(2) Remove 1 clip [1] and take off 1 bushing [2].

Fig. 4-183

(3) Unhook the grounding spring [3].

Fig. 4-184

(4) Slide the exit roller [4] to the rear side, and remove the bushing [5] from the frame.

Fig. 4-185 [2] [1]

[3]

[5] [4]

(5) Remove 2 springs [6].

Fig. 4-186

(6) Take off the exit roller [4].

Fig. 4-187

(7) Remove 1 E-ring [7] and then take off 1 gear [8], 1 grounding spring [3] and 1 bushing [5].

Fig. 4-188 [6]

[4]

[7]

[3]

[8] [9]

4

DISASSEMBLY AND REPLACEMENT 4 - 67

4.9 Disassembly and Replacement of the Auto Document Feeder

In document TOSHIBA E-STUDIO 2505 F service manual (Page 153-171)