DPP-FP55 - Sony Other Service Manuals Service Manual (repair manual). Page 7

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DPP-FP55

The density adjustment is required after replacing the thermal printer
or the main board.

Before replacing the thermal printer or the main board, print a test
pattern (17 step) as the reference of density.
The test pattern (17 step) should be printed before replacing the
thermal printer or the main board, or when this unit is in the normal
state.

If there is any printing failure in the test pattern (17 step) printed

before replacing the thermal printer or the main board, do not use it.

Or in case that the test pattern (17 step) cannot be printed, use the

test pattern that is printed by using the normally-working printer
(DPP-FP55).

1.

Set the ribbon and paper to this unit.

Use the ribbon and paper below.
Color print pack SVM-F40P (postcard size)

2.

Start the service mode. (Refer to Section 1-1-1.)

3.

Select “Print Calibrate” using the arrow buttons (f,F) and press
the [ENTER] button.

4.

When the following screen is displayed on the LCD of this
unit, press the [PRINT] button.

5.

Quit the service mode. (Refer to Section 1-1-1.)
Keep the printed output produced in step 4 as the reference.

6.

Replace the thermal printer or the main board.
(Refer to Section 3.)

7.

Perform the steps 1. to 4. again to print the test pattern (17
step).

8.

Compare the test pattern printed in step 7. with the test pattern
(17 step) printed (reference test pattern (17 step)) in step 4.
Compare the density in each step from the leftmost black pattern
to the rightmost black pattern. If the density in each step is the
same level, there is no problem.
• When the test pattern (17 step) in step 7. is darker than the

test pattern (17 step) (reference) in step 4.:
Slightly rotate the adjustment volume (RV201) on the main
board clockwise.

Print the test pattern (17 step) again and check the density.
• When the test pattern (17 step) in step 7. is lighter than the

test pattern (17 step) (reference) in step 4.:
Slightly rotate the adjustment volume (RV201) on the main
board counterclockwise.

Operation of fan can be check as follows:

1.

Start the service mode. (Refer to Section 1-1-1.)

2.

Press the [PRINT] button on the service mode startup screen.

3.

Check that the fan rotating sound changes in the following order
starting from

Low speed 

t High speed t Stop by every

pressing of the [PRINT] button.

4.

Quit the service mode. (Refer to Section 1-1-1.)

Printing of the test pattern (17 step) starts.

MAIN BOARD (SIDE A)

S704

S401

RV201

S701

Print the test pattern (17 step) again and check the density.
Repeat the above until the same level density can be obtained.

9.

Quit the service mode. (Refer to Section 1-1-1.)