Removal and Replacement Procedures
Power Supply
1. Disconnect the
brown, blue, and green/yellow primary wires from the line
filter. (See Figure 5-1 on page 5-5.)
2. Disconnect th
e green/yellow ground wire from the chassis, using a
5
/
16
inch
nutdriver. (See Figure 5-1 on page 5-5.)
3. Disconnect
the power cable from J14 on the Main board.
4. From outside the instrument, remove the four T-10 screws securing the power
supply shie
ld to the chassis.
5. Lift the power supply out of the chassis.
6. Disconnect the line filter cable from J1 on the power supply.
7. Disconnect the power cable from J2 on the power supply.
8. Remove the two T-15 screws securing the power supply to the shield.
9. Lift the power supply out of the shield.
Fan Assembly
Remove the fan and baffle as a unit.
1. From outside the instrument, remove the one T-10 screw on each side of the
instrument that secures the baffle to the chassis.
2. Use long nose pliers to compress the lock tab on the connector, and disconnect
the fan power cable from J890 on the Main board. (See Figure 4-5 on
page
4-33.)
3. Lift the baffle out of the instrument.
4. When replacing the fan and baffle, make sure that the guide pins and slots line
up correctly, top and bottom.
Fr
ont pane l/LCD Assembly
Remove the front panel and LCD assembly as a unit. For additional clearance
you may remove the Fan assembly first.
1. Remove the six T-10 screws that secure the front panel assembly to the
chassis, two on each side and two on the bottom.
2. Pull the front panel assembly forward, being careful of the Main board
extension containing the headphone and USB connectors, until they clear
the LCD bracket.
3. Disconnect the cables connecting the Front panel/LCD assembly to the Main
board at J17, J18, and J29. (See Figure 4-5 on page 4-33.)
4–32 WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual
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