Diagraph PA/4000, Service Manual, Page: 169 / 213

Technician’s Guide 2-35
REPLACING THE VACUUM UNIT (6105-256)
See Engineering Drawing #6105-107 to further illustrate this procedure .
1. Remove the Air Supply Cover (6105-256).
2. Remove the two screws that hold the Vacuum Pump to the Air Supply Bracket
using a flat head screwdriver.
3. Remove the Vacuum Pump.
4. Disconnect the air hoses connected to the Vacuum Pump.
5. Insert the 1/4 inch hose into the top fitting on the new Vacuum Pump.
6. Insert the 1/8 inch hose into the front fitting on the new Vacuum Pump.
7. Secure the new Vacuum Pump to the Air Supply Bracket with two screws.
2.3.3 MAIN POWER BOX ASSEMBLY
PROCEDURE FOR OPENING THE MAIN POWER BOX ASSEMBLY
See Engineering Drawing 6105-100 to further illustrate this procedure .
1. Turn PA/4000’s power switch to the OFF position. Shut off the air valve on the
filter assembly.
2. Disconnect all air and electrical connections.
3. Rotate the PA/4000 to a comfortable working position.
4. Remove the four buttonhead screws (#38 on ENG. DWG 6105-100) using a 5/16
inch Allen wrench.
5. Remove the rear panel (6105-284) of the Main Power Box.
REPLACING THE TRANSFORMER
See Engineering Drawing #6105-100 to further illustrate this procedure .
1. Open the Main Power Box Assembly.
2. Disconnect the MATE-N-LOCK transformer connector by pulling it apart.
3. Disconnect the two orange lead wires from the rectifier bridge. DO NOT
disconnect the red or black wires from the rectifier bridge.
4. Remove the four transformer support bolts using a Phillips screwdriver.
5. Disconnect the black wire from the fuse holder.
6. Disconnect the transformer's white wire from the transformer from the power
input module.
7. Cut all wire tie wraps from transformer leads. DO NOT cut any wires.
8. Remove the transformer.
9. Mount the mounting plate inside the PA/4000 using the four transformer support
screws.
10. Place a flat washer on each of the four studs protruding from the mounting plate.
11. Slide the new transformer onto the mounting plate making sure that the black and
brown wires face down. (See Figure 2-5)