45
5.5.8 Transformer
1. Turn off power and unplug the AC Cord.
2. Remove the cabinet (see 5.5.1) and the AC PCB (see 5.5.5).
3. Remove the 2 screws in the PCB upper corners or, if the PCB has button fasteners, pry each upper corner
free and fold the PCB down.
4. Disconnect the input power connector from J1 of the main PCB.
5. Remove the screw to the left of the transformer that fastens the chassis grounding wires to the metal box.
6. Remove the 2 screws that fasten the transformer to the metal box.
7. See 2.3 to insure that the new transformer is wired for the correct input voltage.
CONNECTION OF A
TRANSFORMER WIRED FOR 115 VAC TO A 230 VAC INPUT CAN CAUSE PERMANENT DAMAGE
TO THE PRINTER!
8. To install a new transformer reverse the procedure in steps 1 to 6. Route the transformer wires under the
carriage motor so the main PCB input power connector does not pull off.
5.5.9.1 DP6 Printhead
1. Remove the cabinet lid and ribbon cartridge.
2. Remove the 2 screws fastening the printhead to the carriage. See drawing in 5.1.4.1.
3. Disconnect the printhead from the printhead flex cable.
4. Mount the printhead spacer and mounting screws on the new printhead.
5. Replace the printhead and reconnect it to the flex cable.
6. Tighten the mounting screws while pushing the printhead down so the plastic nose flange sits flush against
the edge of the carriage slot.
7. If possible, check the printhead gap (see 5.4.1).
8. Check the top offset parameter (see 5.2)
5.5.9.2 DP7 Printhead
1. Remove the cabinet lid and ribbon cartridge.
2. Remove the ribbon shield by raising the carriage, pushing down on the shield until it snaps free from the
carriage and sliding it out to the right.
3. Remove the screw fastening the printhead to the carriage. See drawing in 5.1.4.2
4. Disconnect the printhead from the 2 printhead flex cables.
5. Remove the old printhead by tilting it forward while lifting the carriage.
6. Replace the printhead and reconnect it to the flex cables.
7. Tighten the mounting screw.
8. If possible, check the printhead gap (see 5.4.2).
9. Replace the ribbon shield and cartridge. Adjust TOP OFFSET, NORMAL and CQ DARKNESS (see 5.2).
5.5.10 Carriage Drive Belt
1. Remove the cabinet (see 5.5.1).
2. Remove the screws fastening the belt clamp.
3. Remove the screw fastening the carriage idler pulley arm to the left pivot arm. The belt and pulley arm are
replaced as an assembly.
4. To install the new belt reverse the procedure in steps 2 and 3.
5. Tension the carriage belt (see 5.4.2).
6. Set the LEFT HOME (see 5.4.4), LEFT MARGIN and CAR ALIGN parameters (see 5.2).