Siemens 353 User Manual page 215

UM353-1B
10.5.2.2 To Replace the Bezel or Circuit Board
REMOVAL
1. Place a properly grounded wrist strap on your wrist and remove the Display Assembly as described
above.
2. Refer to Figure 10-4. Notice that the circuit board is captured by a Fixed Retainer at the top of the
bezel and a Flexible Retainer at the bottom. Grasp the body of the connector at (1) and at the same time press
the Flexible Retainer downward slightly. Pull gently on the connector to lift the bottom edge of the board above
the Flexible Retainer.
The board is a snug fit. Do not squeeze the bezel sides and make removal more difficult.
3. Remove the board from the bezel by carefully continuing to lift board while pulling the board out from under to
Fixed Retainer at the top of the assembly.
4. If the bezel is being replaced:
1) Remove the two Display Assembly mounting screws. Turn the Assembly face up and lift each mounting
screw upward until the threaded portion contacts the bezel. Turn each screw counterclockwise to unscrew
it from the bezel. A screwdriver may be needed once a screw is started.
2) Remove the flip-down door by pressing on the door near its pivot point to free the door from the bezel.
O-Ring Gasket
Keypad
Connector (2)
Part Number
Serial Number
Mounting Screw,
2 Places
INSTALLATION
1. Place an anti-static wrist strap on your wrist and connect the ground lead.
2. Get the replacement bezel, or get the replacement circuit board and remove it from the anti-static
bag.
3. If the bezel is being replaced, start threading each Faceplate mounting screw into the bezel. Use a screwdriver
to complete screw installation. Install the flip-down door; see Figure 10-4.
4. Turn the bezel over.
April 2012
Note
Fixed Board Retainer
Numeric Display (2)
Alphanumeric Display (2)
Connector
Notes:
(1) - Grasp at this point
(2) - On other side of
(1) (1)
(3) - Press to remove and
Flexible Board Retainer
Foam
Rear View
Figure 10-4 Display Assembly Repair
when removing board.
board.
install door.
(3)
Maintenance
Side
View
Flip-Down
Door
10-11