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4.

Press the  Cancel  key when the printing is completed.

5.

When the screen shown in Fig. 3-2 is displayed on the monitor screen, turn off the power and

disconnect the power cord from this unit.

6.

Replace the thermal head.
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. When replacing the thermal head, confirm the resistance value of old and new heads and find the

difference in the resistance value.

. The resistance value is described beside the head.

7.

After the thermal head is replaced, connect the power cord and enter the service mode again.  At that
time, confirm that a 

\ mark is located in “Print Calibrate” on the monitor screen and press the  Enter

key. (Fig. 3-4)

8.

Confirm the display in parentheses in the lower-left position when the screen (shown in Fig. 3-5) is
displayed on the monitor screen. (An example of the screen is R2-4.)

The print voltage after replacement is determined by the difference between the display in
parentheses and the head resistance value in step 6.
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The voltage applied to the head is changed by the head resistance value.  The change in a voltage is

adjusted in two levels.

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In this case, R1 has the lowest resistance value of a head.  The difference in a resistance value is

approximately 290 

Z for each step.

In this case, R1 has the lowest resistance value of a head.  The difference in a resistance value is

approximately 73 

Z for each step.

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(Example)
Assume that the first display is (R2-4) and that the difference between the display and head resistance

value is 350 

Z (the resistance value of a new head is higher).  The display after replacement is (R3-

5).

(Since the difference the display and head resistance value is 290 

Z or more, the step of R

automatically increase by one step.  The step of a numeric character also increases by one step

because of 350 

_ 290 = 60.  For the step of a numeric character, the width of one step is

approximately 73 

Z.  Therefore, the step of the numeric character increases or decreases by one step

if the difference is 36 to 37 

Z or more.)

9.

Move a 

\ mark using Direction keys so that it is located in Rx (x = 1 to 8) obtained by the difference

between the display and head resistance value. (In Fig. 3-7, a 

\ mark is located in R3.)

Press the  Print  key when the 

\ mark is moved to the determined “Rx” position.

10. Printing is initiated and the screen (shown in Fig. 3-8) is displayed on the monitor screen.

11. After the printing is completed, move the 

\ mark to the determined numeric character (“5” because

of (R3-5) in this example) using  Direction  keys and press the  Enter  key. (Fig. 3-9)

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12. The screen (Shown in Fig. 3-10) is displayed on the monitor screen.

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At that time, confirm that the display below “Print Calibrate” is the determined numeric character

(R3-5 in this example).

13. Print a density confirmation pattern (gray) again according to the method in steps 2 to 4.

Confirm that the print result is equal to the density of a test pattern as reference.
If fine adjustment is required, perform steps 7 and later again and increase or decrease the numeric

character in step 11.
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To increase the density, increase the numeric character.
To decrease the density, decrease the numeric character.

14. Set the screen to the initial screen of the service mode, turn off the power, and disconnect the power

cord from the printer.