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Repair and Repl acement Procedures 7-14 ProMa ster 25 00 U ser Ma nual Replacing the Thermal Print Head The thermal print head is mo unted on a sma ll printed circuit board (PCB). Do not attempt to remove the print head …
Repair and Replacement Procedures
ProMaster 2500 User Manual 7-13
Replacing the Print
Drive Motor
Follow the steps below to replace the print drive motor.
1. Turn off the 2500 and remove the power cord.
2. Unplug the motor cable from the motor power supply.
3. Push down on the belt tension wheel and remove the drive belt.
4. Loosen the 5/64-labeler knob set screw (two screws are used on the
thermal printer) and pull the knob off the motor shaft.
5. Remove the four 3/32-inch hex screws that hold the motor to the
labeler plate and remove the motor. See Figure 7-11.
6. Install the new motor and reinstall all the components you removed.
Replacing the Dot
Matrix Print Head
Follow the steps below to replace the print head. If you need to adjust the
gap between the platen and the print head, refer to the “Adjusting the
Print Head Gap” procedure on page 5-24.
The impact print head is mounted on a small printed circuit board(PCB).
Do not attempt to remove the print head from the PCB. The new print
head is mounted on a new board, which should be installed as one
assembly.
1. Turn off the 2500 and remove the power cord.
2. Use a 3/32-inch hex wrench to remove the two hex screws that hold
the print head to the print head mounting blocks.
3. Remove the two cables (J-22 and J-23) from the cable connectors on
the print head PCB.
Note: Identify and mark the polarity of the cables before you remove them.
4. Install the new print head assembly.
Figure 7-11
Removing the Print Drive Motor
(Dot Matrix Printer shown;
Thermal Printer similar)
2310-1
PRINT DRIVE
MOTOR
SCREW (1 of 4)
Repair and Replacement Procedures
7-14 ProMaster 2500 User Manual
Replacing the
Thermal Print Head
The thermal print head is mounted on a small printed circuit board
(PCB). Do not attempt to remove the print head from the PCB. The new
print head is mounted on a new board, which should be installed as one
assembly.
1. Turn off the 2500 and remove the power cord.
2. Use a 3/32-inch hex wrench to remove the hex screw that holds the
print head to the print head mounting block.
Note: In the older style thermal printer, there are two print head mounting
screws and limited clearance for a full-size hex wrench to reach the inside
print head mounting screw. Use an L-shaped 3/32-inch hex wrench that
has been modified by grinding down the extension end so it is between
1/4-inch and 5/16-inch long. Use a 7/64-inch hex wrench to remove the
hex screw that holds the ribbon cable clamp.
3. Pull out the print head assembly and unplug the ribbon cable (J-27)
from the print head PCB cable connector.
4. Install the new print head assembly.
Figure 7-12
Removing the Print Head
2390-1
PRINT HEAD
SCREW (1 of 2)
MOUNTING
BLOCK (1 of 2)
Repair and Replacement Procedures
ProMaster 2500 User Manual 7-15
Replacing the Beam
Head Rotation Motor
Follow the steps below to replace the beam head rotation motor.
1. Turn off the 2500, remove the power cord, and disconnect the motor
cable.
2. Remove the two 3/32-inch set screws in the shaft pulley of the
rotation motor.
3. Remove the single 3/32-inch hex mounting screw in the beam head
pulley.
4. Loosen the four motor mounting screws using a 1/16-inch hex
wrench.
5. Pull up the beam head pulley and remove the beam rotation belt.
6. Remove the motor drive pulley.
7. Use a 1/16-inch hex wrench to remove the four motor mounting
screws and remove the beam head rotation motor.
8. Install the new motor, but do not tighten the four hex mounting
screws.
9. Install the motor shaft pulley, beam head pulley, and beam rotation
belt.
10. Adjust the belt tension by moving the motor closer or farther from
the beam head.
11. When you have sufficient belt tension, tighten the four hex mounting
screws.
Replacing the Beam
Traverse Motor
Follow the steps below to replace the beam traverse motor.
1. Turn off the 2500 and remove the power cord.
2. Lift the main plate of the 2500 and disconnect the ribbon cable
connector from J-7 on the controller board.
3. Disconnect the traverse motor power cable from J-11.
4. Look through the two holes in the top of the beam traverse motor’s
mounting block (see Figure 7-16) while you manually rotate the lead
screw until the heads of the flex coupler set screws are visible
through the holes.
5. Use a 7/64-inch hex wrench to loosen the set screw on the right side
of the flex coupler.
Note: This set screw connects the flex coupler to the beam traverse motor shaft.
6. Use a 5/32-inch hex wrench to remove the four beam traverse motor
mounting screws and remove the beam traverse motor.
7. Install the new motor and re-assemble all of the disconnected
components.