6 Replacement Kit Instruction 43-DR-33-87 3/05
1.4 DR4502, DR45A2 - Two Pen Classic Servo Motor Replacement
Introduction
The procedure in Table 4 lists the steps required to replace the #2 Servo Motor assembly in
Models DR4502, and DR45A2, Two Pen Classic Models of the DR4500/DR4500A Circular Chart
Recorders.
The procedure assumes that the chart door is opened, the chart plate is swung out, and that the
power is removed.
Table 4 Procedure for Replacing the #2 Servo Motor
Step Action
1
Refer to Figure 2 (DR45A2) or Figure 3 (DR4502) For the location of the #2 Pen
Motor and Cabling information.
2
Disconnect the No. 2 pen motor cable from the connector on the top of the Main
printed circuit board. See below for connector location.
Model DR4502 Model DR45A2
J7 J6 or J5
3
Remove the wires from the wire holders on the chart plate and the top of the case.
Very carefully cut the nylon strap surrounding the wires. BE CAREFUL NOT TO CUT
THE WIRES.
4
Remove the screws holding the motor to the servo plate and remove the motor.
5 Install the new motor to the servo plate and secure with the screws provided.
6
Dress the Pen motor cables with the other wires, using the new plastic tie wraps
provided, and place into the wire holders on the chart plate and top of case.
7
Connect the new pen motor cable plugs into the connector locations on the Main
printed circuit board as indicated in step 2.
Alignment of the #2 pen is not required.
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