Sharp AR-M550 (serv.man12) Service Manual ▷ View online
AR-M550/M620 DETAILS OF EACH SECTION 6 - 92
(4) Carriage (lamp unit) shift (scan) speed
The carriage scan speed depends on the copy magnification ratio.
Speed up to 171% = 220mm/s
Speed of 172% - 400% = 110mm/s
(5) Timing chart
Platen timing chart
SPF duplex timing chart
LSU
DRUM
MOTHER PWB
CCD UN
CIS
HDD
MFP CONTROL PWB
PCU PWB
Copy lamp unit
PSW
CCD
MHPS
MIMD
MM
Feed
Return
Home position
Home position
Scan
CCD
SPOD
CIS
SPPD4
SRRC
SPFM
1030mS
181mS
55mS
94mS
AR-M550/M620 DETAILS OF EACH SECTION 6 - 93
D. Maintenance and parts replacement
(1) Maintenance list
✕
: Check (Clean, replace, or adjust as necessary.)
❍
: Clean
▲
: Replace
∆
: Adjust
✩
: Lubricate
❏
: Shift position
AR-M550U/M550N (PM: 250K)
When
calling
250K 500K 750K 1000K 1250K 1500K 1750K 2000K
Remark
AR-620U/M620N (PM: 300k)
300K 600K 900K 1200K 1500K 1800K 2100K 2400K
Unit name
No.
Part name
Scanner section
1
Lens
❍
❍
❍
❍
❍
❍
❍
❍
2
CCD
❍
❍
❍
❍
❍
❍
❍
❍
3
Sensor
❍
❍
❍
❍
❍
❍
❍
❍
4
CIS filter glass
❍
❍
❍
❍
❍
❍
❍
❍
5
Table glass
❍
❍
❍
❍
❍
❍
❍
❍
6
Slit glass (SPF scan mode)
❍
❍
❍
❍
❍
❍
❍
❍
7
Reflector
❍
❍
❍
❍
❍
❍
❍
❍
8
Scanner lamp
❍
❍
❍
❍
❍
❍
❍
❍
9
Document mat
❍
❍
❍
❍
❍
❍
❍
❍
10 Rail (Grease)
✩
✩
✩
✩
✩
✩
✩
✩
11 Drive belt
✕
✕
✕
✕
✕
✕
✕
✕
12 Drive wire
✕
✕
✕
✕
✕
✕
✕
✕
5
12
1
2
10
9
7
3
3
10
3
8
3
4
6
11
12
AR-M550/M620 DETAILS OF EACH SECTION 6 - 94
(2) Maintenance and parts replacement
(Replacement parts)
a. Scanner unit
1) Remove the SPF unit. (See “a. SPF unit” in the “SPF section”)
2) Remove the table glass. (See “a-1. Table glass” in this section)
3) Remove the panel lock connector. (For dehumidifier heater)
4) Remove the flat cable, the connector, and harness from the cable
clamp.
5) Remove the right side cabinets upper and lower.
6) Remove the screw and the fixing plate.
No.
Unit
Parts
a
Scanner
unit
unit
1
Table glass
❍
2
Slit glass (SPF scan mode)
❍
3
Mirror
❍
4
Lens
❍
5
Reflector
❍
6
Scanner dry heater
7
Rails
✩
8
Drive belt
✕
9
Drive wire
✕
10
Pulley
✕
a
Scanner
unit
unit
11
Scanner lamp
❍
12
Inverter PWB
13
CCD lens unit
❍
14
Scanner relay PWB
15
Scanner motor
16
Scanner FLASH PWB
17
Scanner control PWB
18
SPF open/close detector
19
Scanner home position sensor
detector
detector
20
Document size detection light emitting
PWB
PWB
21
Document size detection light
receiving PWB
receiving PWB
a-1
a-2
a-3
a-8
a-4
a-5
a-6
a-9
a-9
a-7
a-7
a-10
a-10
a-11
a-12
a-13
a-14
a-15
a-16
a-17
a-18
a-19
a-20
a-21
a-22
AR-M550/M620 DETAILS OF EACH SECTION 6 - 95
7) Remove the tray.
8) Remove the left side cabinets front and rear.
9) Remove the screw.
10) Hold the both sides of the scanner base, and slide it toward you to
remove.
a-1. Table glass
a-2. Slit glass (SPF scan mode)
1) Remove the right glass holder.
2) Using a cloth, etc. on the right glass surface to prevent fingerprints,
remove the cover.
3) Remove the white reference glass unit.
a-3. Mirror
a-4. Lens
a-5. Reflector
1) Remove the table glass. (See “a-1. Table glass” in this section)
2) Move the lamp unit.
3) Clean mirrors 2 and 3.
4) Remove the black box.
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