Diagraph PA/4000, Service Manual, Page: 171 / 213

Technician’s Guide 2-37
REPLACING THE 2.0 AMP FUSE (6105-383)
See Engineering Drawing #6105-100 to further illustrate this procedure.
1. Turn the PA/4000’s power switch to the OFF position and unplug AC power cord.
2. Using the flat blade screwdriver, push down on the fuse assembly and turn counter-
clockwise. Fuse assembly should become loose and easily accessible.
3. Remove the fuse assembly.
4. Remove fuse and discard.
5. Insert the new 2.0 Amp fuse into the fuse assembly.
6. Place fuse assembly back into the PA/4000 fuse slot.
7. Using the flat head screwdriver, push down on the fuse assembly and turn
clockwise to tighten.
REPLACING THE BRIDGE RECTIFIER (2801-811)
See Engineering Drawing #6105-100 to further illustrate this procedure .
1. Turn the PA/4000’s power switch to the OFF position.
2. Disconnect all electrical and air connections.
3. Open the Main Power Box Assembly
4. Disconnect all wires from the bridge rectifier.
5. Loosen the screw holding the bridge rectifier to the PA/4000 using a 9/64 inch
allen wrench.
6. Connect the red lead to the upper left connector marked “+”
7. Connect the white lead to the lower right connector marked “-”
8. Connect one of the orange leads to the upper right connector marked “AC”
9. Connect the remaining orange lead to the lower left connector also marked “AC”
2.3.4 SENSORS
PROCEDURE FOR REPLACING THE RIBBON LOW SENSOR
1. Turn PA/4000’s power switch to the OFF position. Shut off the air valve on the
filter assembly.
2. Disconnect all air hoses and electrical cables and remove the ribbon spool from the
ribbon supply hub.
3. Rotate the PA/4000 to a comfortable working position.
4. Open the electrical box assembly.
5. Route the ribbon low sensor assembly cable through the slot above the stepper
motor. (Fig. 2-6)
6. Align the ribbon low sensor assembly with the holes in the PA/4000 as shown in
Figure 2-6.