MX-1800N (serv.man14). Section 6 - Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 4

MX-1800N  ADJUSTMENTS  6 – 4

1) With the front cabinet open, enter SIM25-2.

2) Close the front cabinet.
3) Select a developing unit to be adjusted.
4) When [EXECUTE] key it touched, it is highlighted. The devel-

oping roller rotates, and the toner sensor detects toner density,
and the output value is displayed.
The above operation is executed for 3 minutes, and the aver-
age value of the toner density sensor detection level is set
(saved) as the reference toner density control value.
When the reference toner density control adjustment operation
is completed, [EXECUTE] key display return, to normal from
highlight. This makes you know whether the adjustment opera-
tion is completed or not.
The above operation is executed each of the lower speed
mode and the middle speed mode, and the reference toner
density control value is set for each of them.
NOTE: If the operation is interrupted within 3 minutes, the 

adjustment result is not reflected (enabled).

When [EXECUTE] key is touched during rotation, the opera-
tion is stopped and [EXECUTE] key returns to the normal dis-
play.
If [EE-EU], [EE-EL], or [EE-EG] is displayed, setting of the ref-
erence toner density control value is not completed normally.

5)

Use SIM24-5 to clear the developer counter.

6)

Use SIM44-27 to clear the half-tone correction data.
NOTE:
a)

When replacing developer, always replace all the three
colors of Yellow, Magenta, and Cyan.
If only one color is replaced, color balance may be
adversely affected. Black developer can be replaced indi-
vidually.

b)

After replacement of developer or the photoconductor, be
sure to execute SIM44-27 to clear the half-tone correction
data.
If the above procedure is neglected, the half-tone correc-
tion may not be performed correctly.

 

 

This adjustment must be executed in the following cases:
* When the MC/DV high voltage power PWB is replaced. 
* When U2 trouble occurs. 
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
1)

Enter SIM8-2 mode.

2)

Select an output mode to be adjusted with the mode key and
the scroll key. 

3)

Enter the adjustment value (specified value) of the middle
speed mode and touch [OK] key.

EXECUTE

M

K

0

SIMULATION NO.25-02

TEST

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

TCD_K

xx

:

TCV_K

xx

:

TCD_C

xx

:

TCV_C

xx

:

TCD_M

xx

:

TCV_M

xx

:

TCD_Y

xx

:

TCV_Y

xx

:

1/1

K

C

M

Y

CLOSE

EXECUTE

0

SIMULATION NO.25-02

TEST

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

AT DEVE ADJ_L_K

xxx

:

AT DEVE VO_L_K

xxx

:

AT DEVE ADJ_L_C

xxx

:

AT DEVE VO_L_C

xxx

:

AT DEVE ADJ_L_M

xxx

:

AT DEVE VO_L_M

xxx

:

AT DEVE ADJ_L_Y

xxx

:

xxx

:

1/2

CLOSE

AT DEVE VO_L_Y

K

C

M

Y

0

SIMULATION NO.25-02

TEST

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

AT DEVE ADJ_L_K

xxx

:

AT DEVE VO_L_K

xxx

:

AT DEVE ADJ_L_C

xxx

:

AT DEVE VO_L_C

xxx

:

AT DEVE ADJ_L_M

xxx

:

AT DEVE VO_L_M

xxx

:

AT DEVE ADJ_L_Y

xxx

:

xxx

:

1/2

CLOSE

AT DEVE VO_L_Y

Y

K

C

M

0

SIMULATION NO.25-02

TEST

AUTOMATIC DEVELOPER ADJUSTMENT

TCD_K

EE-EL

:

TCV_K

:

TCD_C

xx

:

TCV_C

:

TCD_M

EE-EL

:

TCV_M

:

TCD_Y

xx

:

TCV_Y

:

1/1

K

C

M

Y

CLOSE

EXECUTE

or process interrupt

Adjustment completed

Abnormal

end

EE-EL

EL abnormality

Sensor output level, 1.5V or below; control 
voltage, 8.0V or above

EE-EU

EU abnormality

Sensor output level, 3.45V or above; 
control voltage, 2.0V or below

EE-EC

EC abnormality

Sensor output level, other than 2.5V 

± 0.2V

EXECUTE

EXECUTE

0

A:

A : xxx

B: xxx

C: xxx

;

MIDDLE SPEED GB_K

;

MIDDLE SPEED GB_C

;

MIDDLE SPEED GB_M

SIMULATION

MHV/GRID SETTING AND OUTPUT

xxx

230

850

OK

TEST

CLOSE

EXECUTE

D: xxx

;

MIDDLE SPEED GB_Y

LOW

MIDDLE

0

A:

A: xxx

B: xxx

C: xxx

;

MIDDLE SPEED GB_K

;

MIDDLE SPEED GB_C

;

MIDDLE SPEED GB_M

SIMULATION NO.08-02

MHV/GRID SETTING AND OUTPUT

xxx

230

850

OK

TEST

CLOSE

EXECUTE

D: xxx

;

MIDDLE SPEED GB_Y

LOW

MIDDLE

10-key

or after 30 sec.

NO.

08-02