Tektronix WFM90D, Быстрый старт

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Remove and Replace
WFM90D and WFM91D Service Manual
6- 11
The Top board assembly contains replaceable subparts. Procedures for removing
the subparts are included below.
Top Board.
To remove the Top board, perform the following procedure:
1. Remove the top cover. Refer to
Top Cover
on page 6--5.
2.
Remove the two retaining screws from the top of the Top board.
3. Gently pull on the bottom of Top board to separate it from the Bottom board.
4. If you are replacing the Top board, remove the keypad from the Top board.
Refer to
Keypad on page 6--11.
To replace the Top board, perform the following procedure:
1. Install the keypad if you have replaced the Top board. Refer to
Keypad
on
page 6--11.
2. Gently press on the bottom of the Top board to insert the Top board
connector into the Bottom board connector.
3. Be sure that the circuit board shield is properly aligned. Refer to Top Board
Shield on page 6--12.
4. Install the two retaining screws into the top of the Top board.
5. Install the top cover. Refer to Top Cover on page 6--5.
Keypad.
To remove the keypad, perform the following procedure:
1. Remove the top cover. Refer to Top Cover on page 6--5.
2.
Remove the Top board. Refer to Top Board on page 6--11.
3. Gently pull the keypad from the Top board.
To replace the keypad, perform the following procedure:
1. Press the nubs on the keypad through the holes in the Top board.
2. Use tweezers or needle-nose pliers from the backside of the Top board to
pull the nubs of the keypad through the Top board. See Figure 6--4.
Top Board Assembly