AL-840 (serv.man6). AL800 840 Service Manual-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 14

5) Select the left void area adjustment with the copy picture quality

mode select key. 

(The currently set adjustment value is displayed on the copy
quantity display.)

Adjustment

mode

Adjustment mode display

(LIghting)

Note

Main scanning
direction image
position

Photo copy mode lamp

Main scanning
direction image
position (SPF
mode)

Auto/Photo/Text copy
mode lamp 

Left void area

Auto copy mode lamp

Right void area

Manual copy mode lamp

6) Change the set value and press the start button. 

(The adjustment value is stored and a copy is made.)

When the set value is increased, the void area is increased.

When the set value is decreased, the void are is decreased.

When the void area is changed by 1, the void are is changed by
0.1 mm. 

Repeat procedurs 4) 

∼

 6) until the left void are is within the

specified range. 

7) Select the right void area adjustment with the copy picture quality

mode select key. 

(The currently set adjustment value is displayed on the copy
quantity display.)

Adjust the right void area in the same manner as the left void area
adjustment. 

*

1) If the void area is less than the specified level, the transfer roller,

the fusing roller, the separation pawl, and the paper transport
section are dirtied with toner.

As a result, print paper is dirtied and paper jams are generated.

*

Name

Scale

Parts code/Price rank

—

Content

Preliminary 

work

After-

work

JOB No

JOB No

ADJ M6

Image process
(high voltage)
power adjustment

ADJ 1

Charging voltage
adjustment

ADJ M1

ADJ 2

Developing bias
voltage
adjustment/check

ADJ M1

*

*

Range (MIN)

–1050 V

Range (MAX)

–1200 V

Standard value

–1100 V

Default

–1100 V

*

Test command (Simulation)

MODE

Normal

MAIN CODE

8

SUB CODE

2

*

Enforcement
time

JOB No

Content

S 009/Ua 004

When replacing the High
voltage/motor drive PWB unit

Cycle

—

Condition

Print (copy) density is too dark
or too light. Though copy
density adjustment is executed
with the Test command
(simulation) 46-1, satisfactory
denstiy cannot be obtained.

*

1) Connect between the power PWB and the PCU PWB, the high

voltage/motor drive PWB unit and the operation unit with har-
nesses.

2) Manually turn on the cover switch and turn on the power.

3) Execute SIM 8-2. (The charging voltage (main charer) is out-

putted.)

4) Measure the charging (main charger) voltage with a digital multi-

meter (effective value meter, input impednce 1000M

Ω

 or above).

Adjust VR801 so that the output voltage is –1050 

∼

 –1200 V.

Before measurement, connect the capacitor and the diode to the
tip of the digital multi-metar as shown below.

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