DOWNLOAD Sharp AR-505 (serv.man12) Service Manual ↓ Size: 351.69 KB | Pages: 11 in PDF or view online for FREE

Model
AR-505 (serv.man12)
Pages
11
Size
351.69 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / AR505 Service Manual-Operational Description
File
ar-505-sm12.pdf
Date

Sharp AR-505 (serv.man12) Service Manual ▷ View online

CODE: 00ZAR505//A1E
Digital Copier
AR-250
AR-280/281
AR-285/286
AR-335/336
AR-405
MODEL
AR-501/505
(AR-280/281)
(AR-285/286/335/336)
(AR-405)
(AR-250)
(AR-501/505)
[ 1 ] GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-1
[ 2 ] SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-1
[ 3 ] CONSUMABLE PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3-1
[ 4 ] INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . .  4-1
[ 5 ] EXTERNAL VIEW AND INTERNAL STRUCTURE. . . . . . . . . .  5-1
[ 6 ] SETTING AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . .  6-1
[ 7 ] SIMULATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-1
[ 8 ] DISASSEMBLY, ASSEMBLY, MAINTENANCE . . . . . . . . . . . .  8-1
[ 9 ] TROUBLE CODE LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9-1
[10] OPERATIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . .  10-1
CONTENTS
AR-505
[10] OPERATIONAL DESCRIPTION
Correcting operation in the image forming section (Process correction operation)
1. Outline and purpose
The operations of the image forming section are corrected in order to maintain stable and high-quality print even when changes occur in the
temperature, humidity, consumable parts characteristics, engine conditions, or other environmental conditions.
The correction is performed by controlling various parameters related to the image forming section (process) operations. 
With the above correction operations, stable print quality is always provided, reducing service calls and service time. 
2. Image forming section correction operation (Process correction operation) 
The following are items of the image forming section correction operations (process correction operations).
a. List
Image forming section correction operations (process correction operations) list
Item No.
Correction operations
Purpose, effect
Execution conditions, operating timing
1
Image density sensor sensitivity
correction (Calibration) (Gain
adjustment)
Allows the image density sensor to always
detect the correct image patch density. 
Before process correction operation
2
OPC drum marking sensor sensitivity
correction
Allows the OPC drum marking sensor to
always detect the OPC drum marking
normally.
1
3
Developing bias voltage correction
Prevents against density change and
background copy.
1
4
Laser beam power correction 1
Prevent against a decrease in print density
due to OPC drum membrane decrease.
Specified rotating time of the OPC drum:
AR-250/280/281/285/286/335/336:
  Every 20,000 sec
AR-405: Every 16,600
AR-501/505: Every 15,000
Laser beam power correction 2
Outputs the laser beam power corresponding
to the main charger grid voltage (to maintain
the constant voltage). 
Immediately after correction of the main
charger grid voltage (
1)
5
Main charger grid voltage correction 1
Corrects a decrease in the charging voltage
due to the OPC drum membrane decrease,
maintains the correct density of print and
prevent against background copy.
Specified rotating time of the OPC drum:
AR-250/280/281/285/286/335/336:
  Every 20,000 sec
AR-405: Every 16,600
AR-501/505: Every 15,000
Main charger grid voltage correction 2
Maintains the relations between the
developing bias voltage and the main
charger grid voltage at constant (to prevent
against background copy).
Immediately after correction of the
developing bias voltage (
1)
6
Toner concentration correction
Maintains the normal toner concentration to
maintain the proper density of print and
prevent against background copy.
When the developing bias voltage correction
is performed for the voltage higher than the
specified level is made immediately after the
developing bias voltage correction. (
1)
1 During warm-up after turning on the power.
During warm-up after cancelling SIM 7-1, 24-7, 25-2, 44-2.
After completion of printing when the accumulated print time reaches 30 min from the previous correction.
When the next print is made after the unit is idle for one hour.
3. Details
A.  Operating conditions and timing of the image forming section correction operation
(Process correction operation)
The image forming section correction operation (process correction operation) is performed under the following conditions and timing. 
1) During warm-up after turning on the power.
2) During warm-up after cancelling SIM 7-1, 24-7, 25-2, 44-2.
3) After completion of printing when the accumulated print time reaches 30 min from the previous correction.
4) When the next print is made after the unit is idle for one hour.
AR-505
8/6/1999
10 – 1
B. Details of operations
(1) OPC drum marking sensor sensitivity adjustment (Calibration) and marking detection
a. Outline and purpose
The sensor sensitivity is adjusted to allow correct detection of the OPC drum marking. 
b. Details (Calibration)
The sensor LED drive voltage (current)  is changed, and when the sensor output voltage reaches the specified level, the sensor LED drive current
control value is stored. In actual operations, the sensor LED is driven by the voltage corresponding to the control value and detection is performed. 
(2) Image density sensor sensitivity adjustment (Calibration)
a. Outline and purpose
In the developing bias voltage correction, the image sensor sensitivity is adjusted to allow correct detection of the toner image patch density and
normal operation of the developing bias voltage correction. 
b. Details (Calibration)
The sensor LED drive voltage (current)  is changed, and when the sensor output voltage reaches the specified level, the sensor LED drive current
control value is stored. In actual operations, the sensor LED is driven by the voltage corresponding to the control value and detection is performed. 
(3) Laser beam power correction 1
Deterioration of photo sensitivity due to deterioration of OPC drum is corrected by adjusting the laser beam power according to the OPC drum
rotating time (operation time) to maintain the correct density print. 
(4) Main charger grid voltage correction 1
The main charger grid voltage is increased according to deterioration of the OPC drum to maintain the proper density print and prevent against
background copy.
[mW]
Laser beam power
5
10
15
20
25
30
35
Photoconductor drum correction counter
1 count: 20,000 sec (Photoconductor drum rotation time) (AR-250/280/281/285/286/335/336)
16,600 sec (Photoconductor drum rotation time) (AR-405)
15,000 sec (Photoconductor drum rotation time) (AR-501/505)
0.2mW (max) (AR-280/285/335)
0.12mW (max) (AR-250/281/286/336)
0.16mW (max) (AR-405/501/505)
Laser beam power correction value(
D
LPc1)
LASER BEAM POWER CORRECTION 1
[v]
Main charger grid voltage correction value
5
10
15
20
25
30
35
Photoconductor drum correction counter
1 count: 20,000 sec (Photoconductor drum rotation time) (AR-250/280/281/285/286/335/336)
16,600 sec (Photoconductor drum rotation time) (AR-405)
15,000 sec (Photoconductor drum rotation time) (AR-501/505)
48V (AR-250/281/286/336)
95V (AR-280/285/335)
64V (AR-405)
85V (AR-501/505)
Main charger grid voltage correction value
MAIN CHARGER GRID VOLTAGE CORRECTION 1
AR-505
10 – 2
8/6/1999
(5) Developing bias voltage correction
a. Outline and purpose
Deterioration of developer due to changes in the environmental conditions.
To solve the above problem, the developing bias voltage is changed according to the situation to maintain the proper density print and prevent
against background copy. 
(Operation)
1) Three toner image patches are made on the OPC drum with the three voltages Vdbc and Vdbc 
±
 (n)a. (a = 50V)
2) Connect the three points of three toner patch density points with strait lines, and check that it reaches the reference density.
If the above condition is satisfied, obtain the correction developing bias voltage (Vdbc(n)) for the reference density by linear approximation.
The reference density: 38 (set with SIM 44-4) for AR-280/285/335/405
58 (set with SIM 44-15) for AR-250/281/286/336
36 (set with SIM 44-4) for AR-501/505
3) Calculate the developing bias correction voltage (
v
 Vdbc(n)).
The developing bias correction voltage (
v
 Vdbc(n)) is applied to the developing bias voltage correction in all the operation modes. 
If the condition of 2) is not satisfied, change the condition of 1) as follows and make three toner image patches similarly to 1). 
(Contents of change)
Change the three developing bias voltages of correction for making toner image patches to Vdbc + (n 
±
 1) 
α
, Vdbc + (n 
±
 2) 
α
, and Vdbc + (n 
±
 3)
α
, and execute 1) and 2). (
α
 = 50V)
Repeat the above operation until the condition of 2) is satisfied. (n = Number of toner patch forming. 3 toner image patches are made at once.)
The correction operation of the developing bias voltage should be in the range of 0 
 –750V. 
DEVELOPING BIAS VO LTA GE CORRECTION
Develping bias voltage
Reference level
(Set by T.C  44-4)
Limit(-750v)
800
Vdbc
Vdbc + (n)
α
Vdbc - (n)
α
Vdbc + (n+1)
α
Vdbc + (n+2)
α
Vdbc + (n+3)
α
60
Lower
50
40
38
Image patch density
30
20
10
Higher
0
100
200
300
400
500
600
700
∆ 
Vdbc(n)
α
 = 50
PT2/BS2(1D1)2
PT3/BS3(1D2)3
PT2/BS2(1D1)2
PT3/BS3(1D1)3
 
∆ 
Vdbc(n)
CASE 1
CASE 2
Vdbc(n)
Vdbc(n)
PT2/BS2(1D2)2
PT1/BS1(1D2)1
PT3/BS3(1D1)3
PT1/BS1(1D1)1
PT1/BS1(1D1)1
DEVELOPING BIAS VO LTA GE CORRECTION
Develping bias voltage
60
Lower
50
40
38
Image patch density
30
20
10
Higher
0
100
200
300
400
500
600
700
∆ 
Vdbc(n)
PT1/BS1(1D1)1
PT3/BS3(1D1)3
PT1/BS1(1D1)1
PT2/BS2(1D1)2
PT3/BS3(1D1)3
∆ 
Vdbc(n+1)
FIRST
SECOND
Vdbc(n)
Vdbc(n+1)
α
 = 50
Vdbc
Vdbc + (n)
α
Vdbc - (n)
α
Vdbc(n) - (n)
α
Vdbc(n)
Vdbc(n) + (n)
α
800
Reference level
(Set by T.C  44-4)
PT2/BS2(1D1)2
Limit(-750v)
AR-505
8/6/1999
10 – 3
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  • Here you can View online or download the Service Manual for the Sharp AR-505 (serv.man12) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp AR-505 (serv.man12) Copying Equipment. Information contained in Sharp AR-505 (serv.man12) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.