Citizen iDP-3210 Service Manual page 13

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Remove the thermal head from the control board.
(1) Insert a (-) screwdriver between the heat sink of the thermal head and the head BK (at one end of the arrow mark)
to lift the head slightly so that it may float a little from the connector.
(2) Lift the other end of the head slightly in the same manner so that it may float a little from the connector.
(3) Lift the thermal head vertically paying attention not to touch the heating element, and remove the head
from the connector.
Reference: If the upper cover is removed and the above sub items (1) to (3) are carried out, the thermal head
can be removed without removing the control circuit board.
8. Remove the motor from the chassis.
(1) Remove the upper cover.
(2) Remove the control board.
(3) Remove the cable from the chassis,
and unfasten two M3 x 5 screws.
9. Remove the head SP from the chassis.
(1) Remove the upper cover.
(2) Turn the head SP until it becomes vertical, and then, lower
it downward as it is.
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iDP-3210 Service Manual