(1) Pull off the platen knob 1.
(2) Open the access cover Assy 4 toward the front to remove.
(3) Lift up the sheet guide Assy 5 to remove.
(4) Turn the change lever 2 toward the bottom position.
(5) Insert a flat-blade screwdriver into grooves of frame (5 places for ML 321, 4 places for ML320) and twist to disengage claws of upper cover 3.
(6) Raise the front side of upper cover Assy 3 and shift toward the rear to disengage claws of frame (6 places for ML321, 5 places for ML320).
(7) Raise the upper cover Assy 3 to remove.
(8) To install, follow the removal steps in reverse order.
Note on installation:
Match the posts A at both sides of the sheet guide 5 with the arrow marks on the upper cover. Push the guide into the cover.
Step 2
(1) Open the access cover 1.
(2) Lift up the sheet guide Assy 4 to remove.
(3) Tilting the pull-up roller Assy 2 toward the front, remove it from the shaft of platen Assy 3.
(4) To install, follow the removal steps in reverse order.
Note: Remove the sheet guide Assy 4 before installing or removing the pull-up roller Assy 2.
Step 3
(1) Open the access cover.
(2) Pull up and rotate the head clamp 1 to unclamp the printhead 2 as shown in fig. 3.3.1.
(3) Disconnect the printhead 2 from PC connector 3 and remove.
(4) To install, reverse the removal steps.
Notes on installation:
(1) Insert the printhead 2 into the PC connector 3 while pushing it against the carriage frame 4.
(2) The head clamp 1 must be securely sandwiched between printhead 2 and carriage frame 4 as
shown in fig. 3.3.2 below.
(3) Be sure to check the gap between platen and printhead (see 4).
(4) Be careful not to touch the print head while it is hot.
Important: There is a shim on the carriage frame 4, which hangs over the platen side of the frame. Be sure to replace it correctly. Improper positioning of this shim will severely affect the printhead gap.
Step 4
(1) Remove the printhead (see 3.3.1 below).
(2) Open the pull-up roller cover 1.
(3) Remove the shim on the carriage frame.
(4) Loosen the screws holding the carriage assembly to the carriage frame--this allows more play between the printhead and the platen.
(5) Raise and remove the ribbon protector 2.
(6) To install, follow the removal steps in reverse order. Be sure to replace the shim in exactly the
same position as it was before disassembly.
Step 5
(1) Remove the printhead (see 3.3.1 ).
(2) Remove the upper cover (see 3.3.1 ).
(3) Remove the pull-up roller Assy (see 3.3.3 ).
(4) Remove the ribbon protector (see 3.3.2 ).
(5) Turn the change lever 1 to the bottom position.
(6) Push in the lock levers 2 on both sides to unlock the Assy from the frame, then rotate them upward 90°.
(7) Remove the platen Assy 4 from the base frame.
(8) To install, follow the removal steps in reverse order.
Becareful and besure to disconnect from power source.
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