Samsung SCX 4520, SCX-4521F, SCX4720F Disassembly & Reassembly
Precautions
Service Manual
5-1
Samsung Electronics
5
5
5. Disassembly and Reassembly
5.1 General Precautions on Disassembly
When you disassemble and reassemble components, you must use extreme caution. The close
proximity of cables to moving parts makes proper
routing a must.
If components are removed, any cables disturbed
by the procedure must be restored as close as
possible to their original positions. Before removing any component from the machine, note the
cable routing that will be affected.
Whenever servicing the machine, you
must perform as follows:
1. Check to verify that documents are not stored
in memory.
2. Be sure to remove the toner cartridge before
you disassemble any parts.
3. Unplug the power cord.
4. Use a flat and clean surface.
5. Replace only with authorized components.
6. Do not excessive force on components made of
plastic, they may break.
7. Make sure all components are in their proper
position.
Releasing Plastic Latches
Many of the parts are held in place with plastic
latches. The latches break easily; release them
carefully.
To remove such parts, press the hook end of the
latch away from the part to which it is latched.
Service Manual
Precautions
5-2
Samsung Electronics
5.2 Rear Cover
1. Remove the four screws securing the Rear Cover.
2. Remove the Rear Cover from the Frame Ass'y and
Scanner Ass'y .
3. Unclip the Face Up Cover from the Rear cover, as
shown below. Then lift the Face Up Cover out.
Face Up Cover
Rear Cover
Precautions
Service Manual
5-3
Samsung Electronics
5.3 Side Cover (LH, RH)
1. Before you remove the Side Cover (LH, RH), you
should remove:
- Rear Cover (see page 5-2)
2. Take out the Cassette.
3. Open the front cover and remove 2 screws on the
front and 1 screw on the back. Release 3 clips underneath, ease the rear screw bracket over its locating
pin and pull the RH side cover to the right, taking care
not to damage the clips, to remove it from the Frame
Assembly .
Side Cover (LH)
Cassette
Side Cover (RH)
Service Manual
Precautions
5-4
Samsung Electronics
5.4 Front Cover
1. Open the Front Cover.
2. Remove the Toner Cartridge.
3. Unclip the Front Cover from the Frame Ass'y. Then
remove the Front Cover, as shown below.
Front Cover
5.5 Scanner Ass'y
1. Before you remove the Scanner Ass'y, you should
remove:
- Rear Cover (see page 5-2)
- Side Cover (LH, RH) (see page 5-3)
2. Remove the 2 screws securing the Scanner Ass'y, as
shown below.
3. Remove the 5 connectors and the ground wire screw
from the main PBA as shown below.
4. Pull up the Scanner Ass'y, as shown below.
5. SCX4520 only. Lift the Platen Cover upward to
remove it.
Precautions
Service Manual
5-5
Samsung Electronics
Scanner Ass'y
1
3
2
Service Manual
Precautions
5-6
Samsung Electronics
6. SCX4720F. Free the Scanner Cable Harness from the
clips underneath the scanner and release it from the frame.
7. Lift the front part of the COVER-OPE FRONT to
release the hook connecting the cover with the scan
assembly .
<SCX-4520>
<SCX-4720F>
8. Release the 3 clips on the front of the OPE unit and
remove the OPE unit as shown below, taking care to
thread the cable harness through the frame
<SCX-4520>
<SCX-4720F>
Clips
COVER-OPE FRONT
COVER-OPE FRONT
Clips
Precautions
Service Manual
5-7
Samsung Electronics
9. Remove the 4 screws securing the Scan Upper.
10. Unclip the Scan Upper from the Scan Ass'y by
releasing 2 clips on each side then pull the Scan
Upper upward and remove it.
11. Remove the CCD Cable, as shown below.
12. Pull up the CCD Shaft and take out the Scanner
Module.
13. Squeeze the spring to release the tension in the Belt
and lift from the pulleys as shown below.
CCD Cable
Scan Upper
Scanner Module
CCD Shaft
Spring
Belt
Service Manual
Precautions
5-8
Samsung Electronics
Assembling Scanner Module When
re-assembling the scanner module, belt
and belt spring take care to relocate the
tension spring as close to the right hand
side of the scanner module as is possible,
as shown on the right.
Caution
14. Remove the Reduction Gear and Idle Gear, as
shown below.
Caution. Reassembling Scanner Module
1. When re-fitting the scanner belt and belt spring
take care to relocate the tension spring as close to
the right hand side of the scanner module as is
possible, as shown on the right.
2. When refitting the Scan Upper cover take care to
ensure that the cover open switch is not trapped.
Gear-Timing
Gear-Reduction
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