SHARP Z800 Service Manual

Z-800

SERVICE MANUAL

CODE: 00ZZ800//SM/E

MODEL Z-800

Options • Paper tray (SF-UB14)

• Multi paper feed unit (ZT-MF11)

• Copier table (SF-720D2)

• Personal counter (SF-71A/71B)

CONTENTS

[ 1 ] GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

[ 2 ] PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

[ 3 ] EXTERNAL VIEW AND INTERNAL STRUCTURE . . . . . . . . . . . . . . . . . . . . . . . 3-1

[ 4 ] UNPACKING AND INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

[ 5 ] GENERAL DESCRIPTIONS OF EACH SECTION . . . . . . . . . . . . . . . . . . . . . . . 5-1

[ 6 ] DISASSEMBLY AND ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

[ 7 ] ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

[ 8 ] SIMULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

[ 9 ] SELF DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

[10] SERVICE AT MEMORY TROUBLE AND

[10] MAIN CONTROL PWB REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

[11] MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

[12] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Parts marked with "!" is important for maintaining the safety of the set. Be sure to replace these parts with specified
ones for maintaining the safety and performance of the set.

This document has been published to be used

SHARP CORPORATION

for after sales service only.
The contents are subject to change without notice.

CONTENTS

[ 1 ] GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . 1-1

1. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2. Target users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

3. Novel technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

4. Novel functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

5. System outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

[ 2 ] PRODUCT SPECIFICATIONS . . . . . . . . . . . . . . . 2-1

1. Basic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2. Details of each section . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

3. Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

[ 3 ] EXTERNAL VIEW AND INTERNAL

STRUCTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

1. External view and internal structure . . . . . . . . . . . . . . . 3-1

2. Operation panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3. Cross section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

4. Switches, sensors, detectors . . . . . . . . . . . . . . . . . . . . 3-3

5. Clutches, solenoids . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

6. Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

7. PWBs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

[ 4 ] UNPACKING AND INSTALLATION . . . . . . . . . 4-1

1. Packing drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

(1) Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

(2) Space around the machine . . . . . . . . . . . . . . . . . . . 4-2

(3) Installing table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

(4) Power source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

(5) Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

3. Installation procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4. Adding toner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

5. Optical multi bypass feeder unit Installation Manual . . . 4-6

(1) Open the upper unit of the main copier unit . . . . . . 4-6

(2) Release the lock for the manual bypass unit and

remove the manual bypass unit . . . . . . . . . . . . . . . 4-6

(3) Mount the multi bypass feeder unit onto

the main copier unit . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

[ 5 ] GENERAL DESCRIPTIONS OF

EACH SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

1. Paper feed section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

2. Separation, transport section . . . . . . . . . . . . . . . . . . . . 5-2

3. Fuser, paper exit section . . . . . . . . . . . . . . . . . . . . . . . 5-2

4. Developer section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

5. Optical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

5-1. General descriptions . . . . . . . . . . . . . . . . . . . . . . . 5-3

(1) Original table . . . . . . . . . . . . . . . . . . . . . . . . 5-3

(2) Copy lamp . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

(3) Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

(4) Lens (Fixed focus lens) . . . . . . . . . . . . . . . . . 5-3

(5) Lens base . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

(6) No. 4/5 mirror base . . . . . . . . . . . . . . . . . . . . 5-3

(7) Mirror motor . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

(8) Mirror home position sensor (MHPS) . . . . . . 5-4

(9) No. 2/3 mirror base . . . . . . . . . . . . . . . . . . . . 5-4

(10) Copy lamp unit . . . . . . . . . . . . . . . . . . . . . . .5-4

(11) Thermal fuse . . . . . . . . . . . . . . . . . . . . . . . . .5-4

(12) Reflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

(13) Exposure adjustment plates . . . . . . . . . . . . . .5-4

(14) Lens drive motor . . . . . . . . . . . . . . . . . . . . . .5-4

(15) AE sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

5-2. Basic operations . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

6. Copy process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

(1) Photoconductor . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

(2) Process diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

(3) Actual process . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

(4) Transit of photoconductor drum surface

potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10

(5) Process correction system . . . . . . . . . . . . . . . . . .5-11

1) Outline of the correction system . . . . . . . . . . .5-11

2) Correction operation . . . . . . . . . . . . . . . . . . . .5-11

[ 6 ] DISASSEMBLY AND ASSEMBLY . . . . . . . . . . . 6-1

1. Paper feed section, paper transport section,

power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

1-1. Paper feed unit . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

1-2. Paper feed roller ass’y removal . . . . . . . . . . . . . .6-1

1-3. Separation roller . . . . . . . . . . . . . . . . . . . . . . . . .6-2

1-4. Takeup roller, paper feed roller . . . . . . . . . . . . . .6-2

1-5. Resist roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

1-6. Transport belt . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4

1-7. Socket holder unit . . . . . . . . . . . . . . . . . . . . . . . . .6-4

1-8. Lower unit PWB . . . . . . . . . . . . . . . . . . . . . . . . . .6-4

1-9. Cassette paper empty detector (CPED1) . . . . . . .6-4

1-10. Power unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4

2. Manual paper feed section . . . . . . . . . . . . . . . . . . . . . . .6-5

2-1. Manual paper feed roller, manual takeup roller . . .6-5

2-2. Reverse rotation roller ass’y . . . . . . . . . . . . . . . . . .6-5

3. Fuser section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-6

3-1. Fuser unit removal . . . . . . . . . . . . . . . . . . . . . . . . .6-6

3-2. Heater lamp replacement . . . . . . . . . . . . . . . . . . . .6-6

3-3. Upper heat roller ass’y removal . . . . . . . . . . . . . . .6-7

3-4. Upper separation pawl replacement . . . . . . . . . . . .6-7

3-5. Lower cleaning roller and lower heat roller

replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7

3-6. Scraper replacement . . . . . . . . . . . . . . . . . . . . . . .6-8

3-7. Thermistor/thermostat removal . . . . . . . . . . . . . . . .6-8

4. Optical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9

4-1. Copy lamp replacement . . . . . . . . . . . . . . . . . . . . .6-9

4-2. Copy lamp unit replacement . . . . . . . . . . . . . . . . . .6-9

4-3. Mirror base drive wire replacement . . . . . . . . . . . .6-9

4-4. No.4/5 mirror unit replacement . . . . . . . . . . . . . . .6-10

4-5. Optical unit removal . . . . . . . . . . . . . . . . . . . . . . .6-10

4-6. Other parts in the optical system . . . . . . . . . . . . .6-11

4-7. Light adjustment plate/temperature fuse

removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12

5. Drum section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12

5-1. Drum unit removal . . . . . . . . . . . . . . . . . . . . . . . .6-12

6. Developer section . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-12

6-1. Developer unit removal . . . . . . . . . . . . . . . . . . . . .6-12

6-2. Developer cartridge removal . . . . . . . . . . . . . . . .6-13

6-3. Toner motor removal . . . . . . . . . . . . . . . . . . . . . .6-13

6-4. Toner density sensor . . . . . . . . . . . . . . . . . . . . . .6-13

I

7. Operation panel section/medium cabinet . . . . . . . . . . 6-14

8. Major parts in the frame side . . . . . . . . . . . . . . . . . . . . 6-14

8-1. Ozone filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

8-2. Optical unit cooling fan removal . . . . . . . . . . . . . 6-14

8-3. Ventilation fan motor . . . . . . . . . . . . . . . . . . . . . 6-15

8-4. Transport roller clutch . . . . . . . . . . . . . . . . . . . . 6-15

8-5. Paper exit sensor . . . . . . . . . . . . . . . . . . . . . . . . 6-15

[ 7 ] ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1. Developer section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

(1) MG roller main pole position adjustment . . . . . . . . . 7-1

(2) Adjustment of clearance between DV doctor and MG

roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

2. Optical section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

A. Adjustments list . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

B. Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

C. Adjustment contents . . . . . . . . . . . . . . . . . . . . . . . . 7-4

(1) Image distortion adjustment . . . . . . . . . . . . . . 7-4

(2) Copy image center position adjustment . . . . . 7-8

(3) Focus adjustment (Resolution adjustment) . . . 7-8

(4) Uniformity adjustment . . . . . . . . . . . . . . . . . . 7-10

(5) Image loss/void area adjustment . . . . . . . . . . 7-10

3. COPY DENSITY ADJUSTMENT . . . . . . . . . . . . . . . . 7-13

(1) Copy density adjustment timing . . . . . . . . . . . 7-13

(2) Note for copy density adjustment . . . . . . . . . 7-13

(3) Necessary items for the copy density

adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

(4) Copy density adjustment mode . . . . . . . . . . . 7-13

(5) Copy density adjustment procedure . . . . . . . 7-13

A. Test chart (UK0G-0162FCZZ) setting . . . 7-13

B. Normal copy mode (Non-toner-save mode)

copy density adjustment . . . . . . . . . . . . . . 7-13

C. Normal copy mode (Toner save mode)

copy density adjustment . . . . . . . . . . . . . 7-14

D. Photo copy mode (Non-toner-save mode)

copy density adjustment . . . . . . . . . . . . . . 7-14

E. Auto copy mode (Non-toner-save mode)

copy density adjustment . . . . . . . . . . . . . 7-14

F. Auto copy mode (Toner save mode) copy

density adjustment . . . . . . . . . . . . . . . . . . 7-15

(6) Copy density adjustment table . . . . . . . . . . . 7-16

4. Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

(1) Transfer charger wire installation . . . . . . . . . . 7-17

(2) DV bias adjustment . . . . . . . . . . . . . . . . . . . . 7-17

(3) Separation charger output adjustment . . . . . 7-17

[ 8 ] SIMULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

1. Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

2. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

3. Operating procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

4. Purpose list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

5. Details of simulations . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

6. User simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10

(1) Functions which can be reset or canceled by

user simulation . . . . . . . . . . . . . . . . . . . . . . . 8-10

(2) User simulation procedure . . . . . . . . . . . . . . . 8-10

(3) User simulation code table . . . . . . . . . . . . . . 8-10

[ 9 ] SELF DIAG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

1. Summary/purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

2. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

3. Clearing the self diag display . . . . . . . . . . . . . . . . . . . . .9-1

4. Self diag contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2

5. Conditions for the JAM display . . . . . . . . . . . . . . . . . . . .9-6

1) Paper feed section . . . . . . . . . . . . . . . . . . . . . . . . . .9-6

2) Transport section . . . . . . . . . . . . . . . . . . . . . . . . . . .9-6

[10] SERVICING AT MEMORY TROUBLE AND

MAIN CONTROL PWB REPLACEMENT . . . .10-1

1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

2. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

3. Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

4. Set value recording sheet . . . . . . . . . . . . . . . . . . . . . . .10-3

5. Memory simulation list . . . . . . . . . . . . . . . . . . . . . . . . .10-4

[11] MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1

[12] ELECTRICAL SECTION . . . . . . . . . . . . . . . . . . . .12-1

1. System block diagram . . . . . . . . . . . . . . . . . . . . . . . . . .12-1

2. System operation at power ON . . . . . . . . . . . . . . . . . . .12-1

3. Main circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2

(1) Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2

(2) CPU (IC110) M37702 . . . . . . . . . . . . . . . . . . . . . .12-2

1 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2

2 Pin arrangement . . . . . . . . . . . . . . . . . . . . . . .12-2

3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . .12-3

4 CPU: M37702 (IC110) pin signals . . . . . . . . . .12-4

(3) Start/stop control circuit . . . . . . . . . . . . . . . . . . . .12-5

(4) Heater lamp control circuit . . . . . . . . . . . . . . . . . .12-6

1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-6

(5) Driver circuit (Solen oid, magn etic clu tch) . . . . . . .12-7

1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-7

2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-7

(6) AE (Auto Exposure) sensor circuit . . . . . . . . . . . .12-7

(7) Toner supply motor drive circuit . . . . . . . . . . . . . .12-8

(8) Reset IC (IC113) . . . . . . . . . . . . . . . . . . . . . . . . . .12-8

1 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-8

2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-8

(9) Copy lamp control section . . . . . . . . . . . . . . . . . .12-9

4. Operating section . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11

(1) Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-11

(2) Display circuit . . . . . . . . . . . . . . . . . . . . . . . . . . .12-12

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . .12-12

2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .12-12

(3) LED display . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13

5. Power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13

(1) Signal name and output voltage . . . . . . . . . . . . .12-13

II

[1] GENERAL DESCRIPTION

1. Features

[Small]

• Compact design

• Small area for operation

[Speedy]

• Warm-u p time 30 se c or less, the fi rst co py 5.9 sec ∼ the fastest in

the class.

• The photoconductor and the peripheral parts are integrated into

units. The novel two-component development system eliminates
the need for developer replacement. Parts replacement proce­dures in the fuser section and the paper feed section are simplified
to remarkably reduce maintenance time.

[Soft]

• The energy save mode reduces the total power consumption.

• The noise limiting design results in the quietest machine in the

industry (46 dB).

• Ozone generation is limited.

• Use of materials which can be recycled.

User simulation

The user can select the desired operating conditions easily. Auto
clear time, power save mode time, power save mode warm up time
can be set by the user simulation.

3. Novel technology

Novel two-component development system

During cop y proc ess, de velo pe r is su bsti tute d littl e by litt le to p rev ent
image deterioration. Replacement of developer is not needed. A
developer/toner recycling method is used.

4. Novel functions

Power save function
After a set time, has passed since a copy run has finished, the pwer
save function operates to save energy. There are two kinds of power
save function as shown below. The preferred power save mode can
be selected by the key operator.

1) Pre-heat

• The temperature in the fuser section is lower than that in the ready

state.

• Within 10 sec after completion of pre-heating, the machine returns

to the ready state.

2) Auto power shut off

• Power supply to the fuser section is shut off.

• The time required to return to the ready state and turn on the

ready lamp after completion of auto power shut off is the same as
warm-up time after turning on the power.

2. Target users

Average copy volume of 2,000 ∼ 3,000 sheets/month (max. 10,000
sheets/month)

5. System outli ne

Zooming range

Z-800

250 sheets

(Option)
250-sheets paper tray
(SF-UB14)

* As the other options for all the models, the desk (SF-720D2) and the personal counter (SF-71A/71B) are available.

(1:1)

Single manual feed (Standard)

250-sheet tray

50-sheet mu l ti man ual feed uni t ( ZT - MF11)
(Option)

50

1 – 1

[2] PRODUCT SPECIFICATIONS

1. Basic specifica tio ns

(1) Type: Table top
(2) Copy speed

Paper size Normal Enlargement Reduction

B4 11 sheets/min — —
A4 (Landscape) 14 sheets/min — —
B5 (Landscape) 14 sheets/min — —

10″ × 14″ 11 sheets/min — —

Legal 11 sheets/min — —

Letter (Landscape) 14 sheets/min — —

(3) Warm-up time

Normal Max. 30 sec

Pre-heat Max. 10 sec

Auto power shut off Max. 30 sec

(4) First copy time: 5.9 sec (Fed from No. 1 cassette)
(5) Jam recovery time: 5 sec (Condition: Jam in a section except

for the fuser section, within 6.0 sec from
door open, standard condition.)

(6) Multi copy

Max. quantity of multi copy 99 sheets

(7) Document

Max. document size B4/10″/14″

Document reference position Left side

Detection No

(8) Exposure

Exposure mode Auto/Manual/Photo

Manual steps 9 steps

(13) Power consumption

Max. power consumption 1.4 kW
Average power consumption when operating 0.48 kW
Power consumption in standby 0.095 kW
Power consumption in pre-heating 0.056 kW
Power consumption in auto power shut off 0.026 kW

Note: Max. value when an option is installed.

2. Details of each section

(1) Paper feed section

Copy size

Paper feed system 1 cassette + manual paper feed

Paper feed capacity 250 × 1 + 1 or 50

• AB series

Paper feed

port

Tray B4 ∼ A5

Paper feed
unit
(OP)

Single
manual feed

Multi
manual feed

• Multi

paper feed

• Single

paper feed

AB series B4 ∼ A6

Inch series 10″ × 14″ ∼ 4″ × 6″

Paper feed

size

(Landscape)

B4 ∼ A5

(Landscape)

B4 ∼ A6

(Portrait)

A4 ∼ A5

(Portrait)

B4 ∼ A5

(Portrait)

B4 ∼ A6

(Portrait)

A4 ∼ A5

(Portrait)

Paper weight Special paper

56 ∼ 80g/m2Recycled paper

56 ∼ 80g/m2Recycled paper

52 ∼ 130g/m2Second original,

104 ∼ 130g/m2Postcard, recycled

52 ∼ 130g/m2Postcard, recycled

52 ∼ 130g/m

104 ∼|130g/m

OHP, label

paper

paper

2

Second original,
OHP, label, postcard,

2

recycled paper

(9) Void width

Normal Enlargement Reduction

Void area

Image

loss

(10) Paper exit

Paper exit tray capacity 100 sheets

(11) External demensions

W × D × H (mm) 500 × 480 × 295

Occupying width (mm)

(12) Power source

Power source 120V
Frequency 60Hz

Lead edge

3.0mm or less
Lead edge

3.0mm or less

Weight 26.2 Kg

Lead edge

3.0mm or less
Lead edge

2.5mm or less

Z-800

500 + 261 (Paper exit tray) +

205 (Option MB)

Lead edge

3.0mm or less
Lead edge

5.0mm or less

• Inch series

Paper feed

port

Tray 10″ × 14″ ∼

Single
manual feed

Multi
manual feed
(OP)

• Multi

paper feed

• Single

paper feed

Paper feed size Paper weight Special paper

invoice

10″ × 24″ ∼

4″ × 5″

Letter ∼

4″ × 6″

10″ × 14″ ∼

4″ × 6″

10″ × 14″ ∼

4″ × 6″

Letter ∼

4″ × 6″

15 ∼ 21 lbs Recycled paper

14 ∼ 34.5 lbs Second original,

28 ∼ 34.5 lbs Postcard, recycled

15 ∼ 21 lbs Recycled paper

14 ∼ 34.5 lbs

28 ∼ 34.5 lbs

OHP, label

paper

Second original,
OHP, label,
postcard, recycled
paper

2 – 1

(2) Optical section

Light source Halogen lamp
Exposure system Slit exposure by moving the

light source

Magnification ratio changing
system

Lens Fixed focus lens

(3) Process section

Charging system (–) DC scorotron system
Transfer system (–) DC scorotron system
Separation

system

Copy mode

Main charger
grid voltage

Charge/Transfer
charger applied
voltage

Standard 8-02 –750V±10V

Photo 8-03 –459.9V±10V

Toner save 8-04 –634.4V±10V

By changing the lens
position and scan speed.

Discharge plate/separation pawl

Simulations

No.

–50.0µA ± 4µA

Grid voltage

(4) Developer section

Developing system Novel two-component

developing system
(Developer replacement not
required)

Toner density detection
system

Toner box capacity Developer 48g, toner 180g
Developing bias DC–200V±5V

Magnetic sensor system

• Developer

Material Iron powder carrier
Charging system Negatively charged by friction

• Toner

Charging system Positively charged by friction

(5) Fuser section

Fusing system Heat roller system

Upper heat roller surface
temperature

Standard 170°C
Heater lamp 120V Halogen lamp 1000 W × 1 pc.

(6) Drive section

Main motor

standard

Rating: DC32V, max. 1.32A, 1500 rpm

180°C

3-phase full wave drive, DC brushless

3. Supplies

No. Item Contents Life Model name Packing unit

1 OPC Drum Cartridge • OPC Drum Cartridge x 1 20K ZT-80DR 10
2 Black Toner • Black Toner Cartridge x 1 4K ZT-80TD1 10
3 Black Developer • Black Developer Cartridge x 10 SF-214MD1

(SF-214ND1 x 10)

4 Heat Roller Kit • Upper Heat Roller x 1 80K SF-214HR1 5

• Upper Separation Pawl x 3

• Lower Heat Roller x 1

• Lower Separation Pawl x 3

1

2 – 2

[3] EXTERNAL VIEW AND INTERNAL STRUCTURE

1. External view and intern al str uctu r e

2134

65

97 8

F G H I J

No. Name No. Name No. Name

Exit tray

1

Operation panel

4

Power switch

7

Fusing unit lever

F

Photoconductive drum

I

Document cover

2

Manual by-pass

5

Front cover

8

Toner cartridge

G

Release lever

J

Document glass

3

Manual by-pass guide

6

Paper tray

9

Fusing unit

H

3 – 1

2. Operation panel

1 2 3 4 5 8

EXPOSURE TRAY SELECT

AUTO
MANUAL
PHOTO

No. Name No. Name No Name

Auto/manual/photo key and indicators

1

Misfeed indicator

4

Paper required indicator

7

Zero/read-out key

F

Power save indicator

I

21 345

4

3

2

1

9

8

7

6

6

7

Light and dark keys and exposure

2

indicators
Toner required indicator

5

Copy quantity display

8

Clear key

G

9 10 11 12 13

Drum replacement required indicator

3

Tray select key and indicators

6

10-key pad

9

Print button and ready indicator

H

POWER SAVE

C

5

0

3. Cross section

4

3

2

1

34

78

9

10 1165

12

13

14

15
16

17
18

19
20

21
22

23

2528 27 262930313233

24

No. Name No. Name No Name

No.3 mirror

1

Cleaner unit

4

No.1 mirror

7

No.6 mirror

F

No.4 mirror

I

Manual paper feed roller

L

Tray paper feed takeup roller

O

Tray paper feed roller

R

Resist roller

U

Suction belt

X

Lower heat roller

[

Heater lamp

^

No.2 mirror

2

Discharge lamp

5

Copy lamp

8

Blank lamp

G

No.5 mirror

J

Manual feed take-up roller

M

Tray transport follower roller

P

Tray paper feed reverse roller

S

Transfer charger

V

Upper heat roller

Y

Lower separation pawl

\

Drum separation pawl

3

Main charger unit

6

Lens unit

9

Developer magnet roller

H

Developer tank

K

Manual paper feed follower roller

N

Transport roller (Upper)

Q

Resist roller

T

Photoconductor drum

W

Lower cleaning roller

Z

Upper separation pawl

]

3 – 2

4. Switches, sensors, detectors

2

1

No. Abbreviation Function Type Operation

POD Paper out sensor Transmission photo sensor H when paper is sensed.

1

MHPS Mirror home position sensor Transmission photo sensor H at the home position.

2

PWD Paper size (large/small) sensor Transmission photo sensor L with the large size.

3

PPD Paper transport sensor Transmission photo sensor L when paper is sensed.

4

PED1 Tray paper empty sensor Transmission photo sensor H when paper is present.

5

4
3

5

5. Clutches, sol eno id s

1 2 6

3

5

4

No. Abbreviation Name Function and operation

PSPS Paper separation solenoid For paper separation solenoid drive

1

RRC Resist roller clutch For resist roller rotation

2

TRC Transport roller clutch For transport roller rotation

3

MPFS Manual paper feed solenoid For takeup roller pressing

4

CPFC1 Tray paper feed clutch For paper feed roller rotation

5

MPFC Multi paper feed clutch For multi paper feed roller rotation

6

3 – 3

6. Motors

No. Abbreviation Name Function Type

VFM Paper exit fan motor

1

CFM Cooling fan motor For cooling the optical system DC brushless

2

MM Main motor For the main body drive and the option drive DC brushless

3

LM Lens motor For the optical lens drive DC stepping

4

TM Toner motor For toner supply DC synchronous

5

1

For ventilation of the fuser unit.
For cooling the machine and removing ozone.

2 3

4

5

DC brushless

7. PWBs

No. Name Description

AC circuit PWB AC power input

1

Discharge lamp PWB Discharge lamp drive

2

Main PWB Main body control

3

AE PWB Document density auto exposure detection

4

Blank lamp PWB Blank lamp control

5

Lower unit PWB Lower unit parts control

6

High voltage PWB Supply of the process high voltage and the developer bias voltage.

7

Operation PWB Operation input, display control

8

8 312 4

5

6

7

3 – 4

[4] UNP ACKING AND INSTALLATI ON

1. Packing drawi ng

2. Installat ion

Installation conditions

The following installing conditions must be satisfied to assure the
normal operations of the machine.

Toner Cartridge

Exit Tray

Operation Manual

Developer Cartridge
Drum Cartridge

Copier

(1) Environment

1 Keep the machine away from direct sunlight and avoid instal-

lation near a window or in a bright place.

(Draw the curtain and close the blind shutter completely.)
The plastic parts and the original cover may be deformed by direct
sunlight. Avoid installation near a window even with frosted glass.

2 Avoid installation in high temperature or high humitity en-

vironments. Also, avoid installation where temperature or
humidity may change quickly. (e.g., near an air conditioner).

Otherwise copy papers may be dampened and condensation may
be generated in the machine. This may result in paper jams or
poor copy quality.

(Ideal conditions): The best suitable conditions for machine

operation:
20°C ∼ 25°C: 65 ±5%RH

(Temperature/humidity range): 15°C ∼ 30°C, 20% ∼ 85%

65% for 35°C

Accessories

Drum cartridge 1
Developer cartridge 1
Toner cartridge 1
Exit tray 1
Operation manual 1

* Save the carton and packing materials. The carton and packing

can be re-used for transporting the machine, should it be neces­sary.

% RH

85

65

Humidity

20

15 30 35

˚C

4 – 1

3 Avoid installation where there is a lot of dust or vibrations.

If dust enters the machine, it may degrade copy quality and cause
malfunctions.

(2) Space around the machine

Allow a space of about 15 cm (6 inches) between the rear side of the
machine and the wall for ventilation of the cooling fan. Also allow
sufficient space around the machine for operations.

15cm

4 Avoid installation on an unstable surface.

To assure the proper operations, install on a level surface.

5 Install in a well ventilated place.

6 Avoid installation where there is inflammable gases or am-

monium gases.

Installation near a diazonium copier may degrade copy quality and
cause malfunctions.

(3) Installing table

Use a level (UKOGM0054CSZZ) to install the machine horizontal­ly.

(Note) If the machine is not installed horizontally, toner density con-

trol may not function properly. This may result in poor copy
quality.

(4) Power source

1 The power source should be the rated voltage ±10% with the

capacity corresponding to the max. power consumption.

2 Do not use an extension cord, or operate any other equipment

from the same wall outlet.

(5) Grounding

To avoid electrical hazard, use the properly grounded wall outlet only.

(Carrying the machine)

When carrying the machine, remove the copy tray and hold the dent
portions on the bottom.

7 Install near a power outlet.

4 – 2

3. Installation procedure

1 Remove the copier from the bag and remove all pieces of

tape from the copier.

• Also remove the packing materials as shown.

3 Press the buttons on both sides to unlatch the front cover

and open it.

4 Press the release lever to open the upper half of the copier.

CAUTION: Be sure to open the upper unit slowly and gently, and

do not let go of it until it is fully open.

2 Remove the screw on the left side as shown, and remove the

two screws above the manual by-pass.

5 Grasp the handle of the toner cartridge holder, and swing the

holder out and to the right of the copier until it stops.

6 Remove the drum cartridge from its storage box.

• Remove the black wrapping paper from the drum cartridge.

• Save the box of the drum cartridge. The box should be used to

pack the drum cartridge if the copier must be transported for
servicing.

7 Slide the new drum cartridge in by holding the handle until

the cartridge locks in place.

• Be sure not to touch the surface of the drum.

4 – 3

8 Push down on the upper half of the copier to close it.

H Close the front cover.

9 Insert the developer cartridge by positioning the lower left of

the cartridge along the rail and sliding it until it latches into
place.

CAUTION: When handling developer and toner cartridges for the

first time, do not remove sealing tape until the
cartridges are fully installed into the copier.

F Pull out the sealing tape and remove it from the developer

cartridge.

I Fan the copy paper and load it into the paper tray.

J Fit the exit tray onto the copier by inserting it at an upward

angle into the grooves on the left side of the copier.

G Shake the toner cartridge back and forth several times to

loosen the toner and then install it in the copier as shown.
Pull out the toner sealing tape. See steps 5 to 8 of ADDING
TONER on page 4-5.

• Save the box of the toner cartridge. The box should be used to

pack the toner cartridge if the copier must be transported for
servicing. The box should also be used for disposal of a used
toner cartridge.

➀

➁

K Plug the power cord into a grounded 120 volt outlet.

NOTE: Be sure the power cord is securely plugged in.

L Turn the power on.

• After about three minutes, the READY indicator will light up.

Copying is now possible.

• If

CH

blinks on the copy quantity display, the developer
cartridge is not installed properly. Check the developer
cartridge installation.

• If

CH

blinks on the copy quantity display and the drum re­placement required ( ) indicator blinks, the drum cartridge
is not installed properly. Check the drum cartridge installation.

4 – 4

4. Addi ng to ne r

1 Press the buttons on both sides to unlatch the front cover and

open it.

2 Press down on the toner release lever while pulling the handle to

unlatch the toner cartridge. Grasp the handle and carefully swing
the cartridge out and to the right of the copier until it stops.

5 Take the replacement toner cartridge from its storage box and

shake the cartridge nine or ten times.

• Save the box for disposal of a toner cartridge.

CAUTION: Do not remove sealing tape until the toner cartridge is

fully installed into the copier.

Keep this side up.

6 Install the new toner cartridge by positioning the protrusions in the

slots and then rotating the cartridge counterclockwise 90°.

1

2

3 Gently rotate the cartridge clockwise 90° and then pull to remove

it.
CAUTION: Keep the old toner cartridge with the two holes up so

as not to spill used toner.

2

1

4 Attach the sealing cap onto the old toner cartridge.

• Use the storage box for disposal of the used toner cartridge.

1

2

7 While holding the toner cartridge, pull out the toner sealing tape

completely.

8 Swing the toner cartridge back in place and close the front cover.

Old toner cartridge

4 – 5

5. Optional multi bypass feeder unit
Installation Manual

For use with compatible SHARP copiers.
See SHARP copier Installation Manual to determine suitability.

(1) Open the upper unit of the main copier unit.

1 Press the release buttons on the left and right sides of the main

copier unit’s front cover, then open the front cover.

2 Push the upper half release lever (green) to the right and down,

then gently open the upper unit.

(2) Release the lock for the manual bypass unit and

remove the manual bypass unit.

1 Release the manual bypass unit by pressing upward on the rock

claws (green; 2 locations) which lock it in place in the main copier
unit’s upper unit.
The manual bypass unit will come out toward you slighly.

2 Pull out upon the manual bypass unit to remove it from the main

copier unit.

Manual bypass unit

(3) Mount the multi bypass feeder unit onto the

main copier unit.

1 Slide the positioning pins which project from the multi bypass

feeder unit in to the grooves in the main copier unit, then push the
multi bypass feeder unit into place to in stall it.
At this time, to be sure that the multi bypass feeder unit is securely
installed, push down once more on the fourcorners of the unit. (If it
has not been securely installed, "CH" may appear in the COPIES
MADE display when the power is turned on.)

Multi bypass feeder unit

Rock claw (latch)

Rock claw (latch)

Rock claw (latch)

Rock claw

(latch)

Positioning pins

Positioning pins

Multi bypass
feeder unit

2 Close the upper unit of the main copier unit.

4 – 6

[5] GENERAL DESCRIPTIONS OF

EACH SECTION

The general descriptions of the following sections are given:

1 Paper feed section
2 Separation, transport section
3 Fuser, paper exit section
4 Developer section
5 Optical system
6 Image forming section

Internal structure

When the CPCF turns off, rotation is stopped, and the takeup roller is
pushed up by the roller release arm spring to the position.

(Manual paper feed operation) Multi
When the solenoid B (MPFS) turns on, the takeup roller falls and the
gate rises.
Almost simultaneously the solenoid A (MPFC) turns on and the
takeup roller and the paper feed roller turns to perform the paper feed
operation.

1. Paper feed secti on

The paper feed system is in two ways: the cassette feed and the
manual feed. The cassette is of the universal type and has the
capacity of 250 sheets. It is attached and detached at the front
cabinet, that is, the front loading system.
The manual paper feed is single. (The multi paper feed unit (ZT­MF11) is an option.)

(Cassette paper feed operation)
The cassette paper feed clutch (CPFC) turns on, the paper feed roller
shaft, the paper feed roller, and the takeup roller rotate. At the same
time, the roller release arm is lowered by the limiter spring. As a
result, the takeup roller falls by its own weight to reach the paper
surface, performing the paper feed operation.

ON

When the PPD turns on, the MPFS turns off and the RRC turns on.
Almost simultaneously the MPFC turns off to return the roller and the
gate to the initial state.

OFF

5 – 1

2. Separation, transport section

4. Developer section

After passing the resist roller section, the paper is transported to the
transfer section. After transfer, the paper is separated from the drum
by the separation electrode and the drum separation pawl, then
transported to the fuser section by the transport belt.

3. Fuser, paper exit section

The toner image transferred on the paper is fused by the heat and
pressure of the upper and the lower heat rollers. After fusing, dis­charge static electricity on the paper with the discharge brush. Then
the paper is discharged to the copy tray.

In the developer section, toner is attached to the electrostatic latent
image on the drum to change the latent image into a visible image.
Toner and carrier are charged by friction caused by the stirring roller
in the developer unit. Toner is charged in positive, and carrier is
charged in negative charge.
Since the latent image on the drum (area not exposed to light) is
negatively charged, it draws toner which is positively charged.
To prevent against excessive copying, a bias voltage of -200V is
applied to the MG roller.
This model employs the novel two-component developing system
(Developer replacement not required).
When, in the case of the conventional development method,
developer (mixture of carrier and toner) is deteriorated, developer
itself must be replaced or the whole developer unit must be replaced
as in the personal machines.
In the new development system, however, developer is supplied in a
certain cycle during development process (developer is mixed with
toner and supplied with toner when toner is supplied), and removed
(automatically by the overflow system when the rate of deteriorated
developer in the developer unit reaches a certain level), preventing
against deterioration in image quality and eliminating the need for
developer replacement in maintenance.
Therefore, "toner cartridge" supplied as a supply item is developer
(mixture of toner and carrier).
Deteriorated developer will overflow from the discharge port of the
developer unit automatically and collected by the waste toner collec­tion container together with residual toner on the photoconductor
drum.

• Temperature control

Heat roller surface
temperature detection

The heat roller is heated by the
heater lamp.
(When the heat roller surface
temperature is 180 C˚ or lower,
the heater lamp is actuated)

Contact open (*)

Abnormal high
tem p erature

CPU

(Heater troub l e)
Self diag di spl ay

Thermistor

Heat r olle r

Heater lamp

Thermostat

• Abnormally high temperature (H3)

• Abnormally low temperature (H4)

• Thermistor disconnection (H2)

When the thermostat contact is open, it is required to press the

*

reset button in the upper side of the thermostat. (The contact is not
reset automatically.)

Flow of the new toner

Deteri orat e d deve lope r
(Automatical l y di scha rged to t he w aste t o ner
collection container)

Residual toner on the photoconductor drum
(Cleaned in section and sent to the waste toner collection container)

Toner box
(mix tu re o f tone r and carri e r)

Waste toner collection
container

5 – 2

5. Optical system

5-1. General descriptions

• The optical system is composed of the fixed focus lens and six

mirrors.
Since the fixed focus lens is employed, No.4/No. 5 mirror base is
moved as well as the lens to change the distance between the
document and the drum (OID, Original Image Distance) for reduc­tion and enlargement.
To move the lens, he stepping motor is driven by the signal from
the main control PWB (This model has no zooming function, and
its lens and No.4/No.5 mirror base are fixed.)

4

5

15

10

9

• Exposure is adjusted by changing the voltage of the copy lamp.

The copy lamp unit is provided with the AE sensor for detection of
the original density to adjust the light quantity of the copy lamp
according to the original density.

• For exposure, the slit exposure system is employed where the light

source is moved. (The original table is fixed.)

16

12

6

127

13113

8

14

1 Copy lamp 2 Reflector 3 No. 1 mirror
4 No. 2 mirror 5 No. 3 mirror 6 Lens
7 No. 4 mirror 8 No. 5 mirror 9 No. 6 mirror
F No. 2/No. 3 mirror base unit G Copy lamp unit H No. 4/No. 5 mirror base unit
I Mirror motor J Lens drive motor K Mirror home position sensor
L Auto exposure sensor

(1) Original table

The original table is fixed, and originals are set to the left frame side
as the reference.

(2) Copy lamp

100V s ystem (285W)

(3) Mirror

Six mirrors are used.
No. 1 mirror is provided in the copy lamp, No. 2/3 mirrors at the
No.2/3 mirror base, No. 4/5 mirrors at the No. 4/5 mirror base. The
No.2/3 mirror base is scanned during copying.

(4) Lens (Fixed focus lens)

• Construction (One group 3 lenses)

• Brightness (F8)

• Focus (175mm)

(5) Lens base

The lens is mounted to this lens base.

(6) No. 4/5 mirror base

The No. 4/5 mirror is installed to this base.

5 – 3

(7) Mirror motor

The mirror motor is a stepping motor, and used to move the copy
lamp unit and the No. 2/3 mirror base in order to obtain the rpm
corresponding to each magnification ratio.

(8) Mirror home position sensor (MHPS)

Used to sense the home position of the copy lamp unit. This sensor is
a photo transmission type sensor.

(9) No. 2/3 mirror base

The No. 2/3 mirrors are attached to this base. The mirror base is
scanned by the mirror motor.

(Copy lamp control in each copy density)

80

70

CLV
(Copy lamp
application
voltage)

60
50
40

(V)

[MAX. 85V(170V)]

[MIN. 40V(80V)]

(10) Copy lamp unit

This is composed of No. 1 mirror, the thermal fuse, the copy lamp,
the exposure adjustment plate, and the reflector, and is scanned by
the mirror motor.

(11) Thermal fuse

The thermal fuse is closely attached to the reflector in order to
prevent against abnormal temperature rise in the optical system. In
case of abnormal temperature rise, the power for the copy lamp is
turned off.

100V system (117°C)

(12) Reflector

Light from the copy lamp is reflected onto the original.

(13) Exposure adjustment plates

Three exposure adjustment plates are attached to the copy lamp unit
to adjust the exposure balance in the front and the rear frame direc­tion.

(14) Mirror base drive wire

This wire is used to transmit the drive power of the mirror motor to the
copy lamp unit and the No. 2/3 mirror base to scan the mirror base.

(15) AE sensor

The original density is detected with the intensity of the copy lamp
light reflected from the original. The measurement area is the mirror
base scan area of about 100mm at the center.
The element is a photo diode.

EX1

(Optical system dirt correction)

The Z-800 perform dirt correction by changing the copy lamp intensity
according to the dirt degree in the optical system (the copy lamp unit,
No. 1 mirror, No.2 mirror, No.3 mirror) to prevent against remarkable
degrading of copy quality.
The reference value is the AE sensor output value which is obtained
when the reference plate is exposed with the copy lamp voltage of

67.7V (135.4V) at power ON.
This value is checked with sim 44-02.

Reference plate (Glass holder)

CPU

Reference value

> Measured value

Correction data output

234

Table glass

Copy lamp light quantity "UP"

Automatic exposure
sensor

EX5

5-2. Basic operati on s

(Relationship among the original, the lens and the image in normal
copy ratio)
The distance between the surface of original on the table glass and
the lens is made equal to the distance between the lens and the
exposure surface of the photoconductor to make the original and the
image equal to each other.

5 – 4

6. Copy process

(1) Photoconductor

• This model uses OPC (organic photoconductor) as photoconduc-

tive material.

OPC layer CTL (Electric charge moving layer)

CGL (Electric charge generating layer)
Aluminum layer

(2) Process diagram

Original

Copy lampMirror lens

High voltage unit

Exposure

Transfer

Exposure

Development

Drum upper

ima ge/paper

synchronization

Resist roller

Discharge lamp

Cleaning bl ade

Waste toner collection

Paper exit

Main corona unit

Separ a tion

Fusing

Charging

Discharging

Cleaning

Separation

Blank lamp

Toner

Developer

High voltage unit

Paper feed roller
Transportroller

Manual paper feed
Pape r ca sse tte

Discharge lamp

Cleaning bl ade

Seper ati on pa w l

Heat r olle r

Heater lamp

Separation cor ona unit

High voltage unit

Main corona unit

Seperation corona unit

Transfer charger

High voltage unit

Blank lamp

Devel oper u nit
MG roller

Resist roller

Transfer corona unit

Image forming process

Paper transport path

5 – 5

(3) Actual process

Step 1 (charging)

The OPC drum is negativelycharged by corona discharge of the
transfer charger . Positive charges are generated in the aluminum
layer.

Aluminum layer

OPC drum

CGL

CTL

Seperation pawl

Transfer corona unit

High voltage unit

Step 2 (Discharging)

When the OPC drum is exposed to the discharge lamp light, positive
and negative charges are generated in the OPC drum CGL. The
negative charges move to the positive charges generated in the
aluminum layer in step 1, and the positive charges move to the
negative charges on the OPC drum surface charged in step 1. The
positive charges and the negative charges are neutralized each other
in the aluminum layer and on the OPC drum surface. As a result, the
OPC dru m surface potential become s 20V ∼ 30V.

Discharge lamp

Cleaning blade

Main corona unit

Seperation corona unit

Blank lamp

Devel oper u nit
MG roller

Resist roller

Transfer corona unit

Discharge lamp

Light

OPC drum

CTL

CGL

Aluminum layer

By performing step 1 (Charging) and step 2 (Discharging), the
photoconductor itself is initialized to stabilize the drum surface poten­tial.

Discharge lamp

Cleaning blade

Seper ati on pa w l

Main corona unit

Seperation corona unit

Blank lamp

Devel oper u nit
MG roller

Resist roller

Transfer corona unit

5 – 6

Step 3 (Main Charging)

By negative discharging of the main charger, uniform negative char­ges are applied to the OPC drum surface.
The OPC drum surface potential is controlled by the screen grid
voltage to maintain the grid voltage at a constant level.

• When the drum surface potential is lower than the grid voltage,

electric charges generated by discharging of the charger go
through the screen grid to charge the drum surface potential until it
becomes equal to the grid voltage.

• When the drum surface potential virtually reaches the grid potential

level, electric charges generated by discharging of the charger
flows through the electrode of the screen grid to the high voltage
unit grid voltage output circuit, thus always maintaining the drum
surface potential at a level virtually equal to the grid voltage.

• The main corona unit employs the scorotron system to charge the

photoconductor surface to a certain level uniformly.
In addition, the conventional corona wire is replaced with the
corona charging mechanism by saw-teeth plate (stainless steel
plate of 0.1 mm thick). In corona discharge, oxygen molecules in
the air are ionized to generate ozone (O3). The mechanism restrict
the generation of ozone.

Main corona unit

Main corona unit

Blank lamp

High voltage unit

Screen grid

CTL

CGL

OPC drum

Aluminum
layer

Step 4 (Exposure)

Light from the copy lamp is radiated on the document, and the optical
image of the document is reflected by the mirrors and projected
through the lens to the OPC drum.
The lighter portion of the document reflects more light (high intensity)
to the OPC drum, and the darker portion of the document reflect less
light (low intensity) to the OPC drum. Positive or negative charges are
generated in the CGL of the OPC drum where lights are radiated.
Negative charges generated in the CGL move towards the positive
charges in the aluminum layer generated in step 3. While the positive
charges in the CGL move towards the negative charges on the CPU
drum surface generated in step 3. Therefore, positive charges and
negative charges are neutralized in the aluminum layer and the OPC
drum surface at the light radiating position, decreasing the OPC drum
surface potential. The CGL electric charge generating amount in­creases in proportion to the document density, that is, reflected light
intensity (the OPC drum surface intensity). Therefore, electric char­ges are generated less in the CGL layer corresponding to the lighter
density of document (higher intensity of the OPC drum surface), and
a greater quantity of the negative charges on the OPC drum surface
is neutralized, decreasing the OPC drum surface potential more.

Discharge lamp

Cleaning blade

Seperation pawl

Seperation corona unit

On the contrary, electric charges are generated more in the CGL
layer corresponding to the darker density of document (lower intensity
of the OPC drum surface), and less quantity of the negative charges
on the CPU drum surface is neutralized, decreasing the OPC drum
surface less. Therefore, the OPC drum surface potential correspond­ing to the lighter portion of the document is lower, and that cor­responding to the darker portion of the document is higher. Latent
static-electricity images are formed in the above manner.

Transfer corona unit

Developer unit
MG roller

Resist roller

5 – 7

CTL

CGL

Low intensity in
the area corre­sponding to the
darker density
portion of the
document

Medium intensity
in the area corre­sponding to the
medium density
portion of the
document

HIgh intensity in
the area corre­sponding to the
lighter density of
the document

Aluminum
layer

OPC drum

Surface potential

(High)

CTL

CGL

Surface
potential
(Medium)

Surface
potential
(Low)

Aluminum
layer

OPC drum

Step 5 (Development)

Toner is attached to the latent static-electricity images on the drum
surface to change them to visible images. The two-component mag­netic brush development system charges toner positively by friction
with carriers, and toner is attached to negative charges on the drum
surface. The potential in the darker document projecting area (low
intensity) is high (much negative charges) and attracts more toner.
The potential in the lighter document projecting portion (high inten­sity) is low (less negative charges), and attracts less toner.

Discharge lamp

Cleaning blade

Seperation pawl

Main corona unit

Seperation corona unit

Blank lamp

Developer unit
MG roller

Resist roller

Transfer corona unit

OPC drum

CGL

Aluminum layer

Higher surface
potential
(Much negative

(charges)

Medium surface
potential
(Less negative

(charges)

Lower surface
potential
(No negative

(charges)

CTL

MG roller

-200V

High voltage unit
bias voltage

At that time, a bias of –200V is applied to the MG roller (magnet
roller), which is provided for preventing toner from being attracted by
the residual voltage (about –80V to –100V) in the lighter portion after
exposure.

Discharge lamp

Cleaning blade

Seperation pawl

5 – 8

Main corona unit

Seperation corona unit

Blank lamp

Developer unit

MG roller

Resist roller

Transfer corona unit

Step 6 (Transfer)

g

The transfer paper is charged higher than the OPC drum surface
potential by strong negative discharge of the transfer charger, making
the binding force between the transfer paper and toner stronger than
that between the drum and toner, attracting toner to the transfer
paper.

Aluminum
layer

OPC drum

CGL

CTL

Toner

Transfer paper

Seperation pawl

Transfer corona unit

h voltage unit

Hi

Step 7 (Separation)

After transfer, the copy paper and the drum are negatively charged.
Since, however, the negative potential of the copy paper is higher
than that of the drum, a attraction force is applied between the drum
and the copy paper. To avoid this, AC corona is applied to the copy
paper by the separation charger to decrease the copy paper potential
to the same level as the drum surface potential. The attraction be­tween the copy paper and the drum is weakened by this, allowing
separation of the copy paper by its own extending force. If the copy
paper is not separated by the separation charger, it is separated by
the separation pawl mechanically.

Discharge lamp

Cleaning blade

Main corona unit

Seperation corona unit

Blank lamp

Developer unit
MG roller

Resist roller

Transfer corona unit

Aluminum
layer

CGL

CTL

High voltage unit

Seperation corona unit

OPC drum

Toner

Transfer paper

Discharge lamp

Cleaning blade

Seperation pawl

5 – 9

Main corona unit

Seperation corona unit

Blank lamp

Developer unit
MG roller

Resist roller

Transfer corona unit

Step 8 (Cleaning)

Residual toner on the drum is removed by the cleaning blade. The
removed toner is sent to the waste toner container by the waste toner
transport screw.

Blade Aluminum layer

CTL

CGL

Residual toner

OPC drum

Step 9 (Discharging)

When the OPC drum is exposed to the discharge lamp light, positive
and negative charges are generated in the OPC drum CGL. The
negative charges generated in the CGL move towards the residual
positive charges in the aluminum layer, while the positive charges in
the CGL move towards the residual negative charges on the OPC

Discharge lamp

Discharge lamp

Cleaning blade

drum surface. Therefore, the positive and the negative charges are
neutralized in the aluminum layer and on the OPC drum surface,
removing the residual charges on the OPC drum surface. As a result,
the OPC drum surface potential becomes 20V ∼ 30V.

Main corona unit

Seperation pawl

Seperation corona unit

Main corona unit

Blank lamp

Developer unit
MG roller

Resist roller

Transfer corona unit

Blank lamp

Residual charge

OPC drum

CTL

CGL

Aluminum layer

Residual cha rge

(4) Transit of photoconductor drum surface potential

-800V

-600V

-400V

-200V

Separate
(OFF)

Clean

DLTransfer

Charge

Exposure

Discharge lamp

Cleaning blade

Seperation pawl

BL

Develop

Dark area

Light area

Seperation corona unit

Transfer

Developing
bias voltage

Transfer corona unit

Separate Clean

Developer unit
MG roller

Resist roller

DL

T (Time)

5 – 10

Residual potential

(5) Process correction system

1) Outline of the correction system

This model is provided with the correction system for the optical unit
and the photoconductor drum unit. The combination of the two cor­rection systems provides stable clear copy.
These functions are to maintain the copy quality for a long time and to
correct the characteristics of the parts, and are controlled by the
software and invisible from the outside.

2) Correction operation

1. Photoconductor drum unit correction (Photoconductor
drum sensitivity correction)

Cleaner

Fig. 2

VCL

Correction level
(CL voltage)

Fig. 3

Change the tickness of the carrier transport layer (CTL).

Develop

OPC drum

By the developper.
By the cleaner blade.

Fig. 1

(NEW)

CTL

CGL

(USED)

Wear down

CTL

CGL

Manual mode exposure 1

Photo m od e exp o s u r e 1

Manual mode exposure 5

Photo m od e exp o s u r e 5

Correction level is initialized by Simulation 46 or
by replacing the photoconductor drum.

0 100 150 200 250

50

Drum r o tating time

min

The photoconductor drum is subject to mechanical stress by the
cleaning blade, resulting in wear in the OPC layer. In addition to that,
the photoconductor drum receives optical stress from the copy lamp.
These stresses reduce the photo sensitivity of the photoconductor
drum, producing unnecessary dirt copy. This trouble is removed by
adjusting the copy lamp voltage. For this model, however, to reduce
the number of service calls, the copy lamp voltage is automatically
dropped according to the reduction in the photo sensitivity of the
photoconductor drum to correct it.

The drum rotating time from installation of a new photoconductor
drum is counted by the timer and the copy lamp voltage is corrected
in every mode. (Refer to Fig. 3.)
The correction is performed within the range of the max. supply volt­age of the copy lamp. (The rotating time of the photoconductor drum
can be checked with Simulation 44-4.)

* The correction level is initialized by Simulation 46 or by replacing

the photoconductor drum.

5 – 11

2. Optical unit correction (Dirt correction)

Diagram of correction system in the optical section

Referance refrection p late

Copy
lamp

AC power supply unit
(Copy lamp control circuit)

Mirror

AE SENSOR

The purpose of this correction is to maintain the copy density even
though the optical unit is contaminated and to reduce troublesome
cleaning of the optical unit.
When the lamp, the mirror, and the reflector are dirtied with dusts and
toner, the light quantity radiated to the photoconductor drum is
reduced, increasing the copy density and producing unnecessary
background copy.
The above trouble is removed by changing the copy lamp voltage to
adjust the copy density. It, however, requires serviceman’s operation.
In this model, the AE sensor senses dirt on the copy lamp, the mirror,
and the reflector, and the copy lamp light quantity is changed accord­ing to the dirt level to reduce the change in the copy density due to
the optical unit dirt.
When the optical parts are dirtied, the reflection rate is reduced to
reduce the quantity of light which is passed to the optical dirt sensor.
In this manner the dirt level is sensed.

[Initial setting]

After execution of Simulation 46, the scanner unit stops at the posi­tion of the standard reflection plate on the back of the document
stopper to light the copy lamp at a certain level, and the AE sensor
output level at that time is recorded as the reference value. (The
reference value can be checked with Simulation 44-2.)

[Correction timing]

The correction is performed after the copy cycle after turning on the
power, or after the specified time of rotation of the photoconductor
drum.

[Correction operation]

The same operation as the initializing is performed to change the
copy lamp voltage until the AE sensor output level reaches the same
level as the reference value, performing the correction.
The copy lamp voltage is revised to a new value at every correction,
and the new value will be used in the next correction.
(The correction voltage value can be checked with Simulation 44-3.)

AMP

Driver

Referance refrection plate

MAIN CONTROL PWB

Counter
watcher

A/D
converte r

CPU

Arithmetic unit

Copy lamp control
clock generator

START

Scanner unit
initial operation

The sc an ner unit s tops
at the standard reflec­tion plate position.

YES

Correction

mode ?

NO

Copy lamp ON

Optical dirt sensor
standard level
(DSENS) memory

End

Total
counter

Copy lamp ON

Table glass

AE sensor
(Next to the lens)

EE-PROM

Copy lamp
referance control
level

Sensor output

(Standard level ?)

New copy lamp
voltage calculation

Fig.5

Copy lamp voltage
lighting voltage
decreasing ON

67.7V <

copy
voltage ?

67.7V

NO

NO

YES YES

5 – 12

[6] DISASSEMBLY AND ASSEMBLY

The descriptions of this chapter are divided into the following sec­tions:

1. Paper feed section, paper transport section, power section

2. Manual paper feed section

3. Fuser section

4. Optical system

5. Drum section

6. Developer section

7. Operation panel/medium cabinet

8. Major parts in the frame side

1.Paper feed section, paper transport
section, power section

1-1. Paper feed unit

1 Open the front cover and open the body. Release the right and

the left lock levers and pull out the manual paper feed unit.

2 Disconnect the CN-B connector of the lower PWB, remove the

paper feed unit fixing screws (4 pcs.), and lift the paper feed unit
to remove.

1-2. Paper feed roller ass’y removal

1 Disconnect the connector of the magnetic clutch in the rear frame

side.

2 Remove the hook section of the paper feed roller bearing in the

front frame side by using a screwdriver $ .

3 Remove the roller release arm spring from the paper feed frame.

2

3

4

1

6 – 1