Maintenance
7–6
1502C MTDR Service Manual
Conductor Color Alternate Color
Ungrounded (line) Brown Black
Grounded (neutral) Blue White
Grounded (earth) Green/Yellow Green
1. Unplug the battery cable at the battery and at the plug on the Power Supply
board.
2. Remove the two (2) screws securing the battery clamp to the chassis.
3. Remove the battery clamp, making sure not to short the terminals with the
clamp.
4. Carefully lift the battery from the chassis.
1. From the top side of the instrument, remove the multi-colored cable (power
supply) from the Main Board.
2. Turn the instrument upside down to expose the top of the Main Board.
3. Remove the three multi-colored cables from the component side of the Main
Board. This can be accomplished by inserting a small straight-blade
screwdriver in the key and gently prying the connector from the board. Take care
to guide the connectors straight off to avoid bending the pins.
4. Remove the eight screws and the center spacer post (with washer and locknut)
that fasten the Main Board to the chassis.
5. Remove the Main Board, taking care to avoid binding on the power switch
mechanical linkage.
NOTE. One of the corner screws (see Figure 7–3) holds a ground strap connector.
Power Cord Conductor
Color Code
Removing the Battery
Removing the Main Board
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