Reassembly The Terminal Chassis And Transceiver Board; Enhanced Control Head Fitting - Motorola MTM800 Basic Service Manual

MAINTENANCE
CAUTION: The thermal pad can act as an adhesive and cause the leads of the heat
!
dissipating devices to be over stressed if the board is lifted too quickly.
If the board can't be easily lifted, the chassis must be heated up to 55 degree Celsius.
Mainboard
Lift
Figure 6-5 GPS and Mainboard Removal (view from bottom side)
Reassembly the Terminal Chassis And Transceiver Board (torques, see page 6-7)
1. Inspect the transceiver board and ONLY if the surface of the thermal pads show signs of
damage, remove the thermal pads and apply thermal grease to the heatsink area on the
chassis and heat dissipating devices.
2. Insert the transceiver board at an angle (approximately 30°) into the chassis taking care to
slide the antenna connector and accessory connector into their cut-outs in the chassis.
3. Lower the transceiver board onto the chassis and align the two locating holes in the board
with the locating pins in the chassis.
4. If a UCM board was mounted, reconnect the flex cable to the mainboard. Take care of the
specific flex bending. Note: After removal the UCM board has to be reprogrammed (App. C).
5. Secure the cover to the chassis with the six screws previously removed.
6. Torque the six screws to 1.9 NM (17 in lbs) using the T20 TORX™ driver. Begin with screw 6
followed by 5 to 1. Since the screws usually take a set, torque the screws a second time
(1.9 NM) in the same order.
7. If existing, reconnect the GPS flex cable and reassemble the GPS module and cover plate.
8. Refit top cover over the assembled terminal chassis. Press cover down until it snaps into
place.

Enhanced Control Head Fitting

1. Align the 'dot' or 'O' marking on the flex with the 'O' mark on the chassis to the socket on the
terminal assembly as shown in Figure 6-2.
2. Check that the back housing o-ring seal is undamaged and fitted in the groove. Replace the
seal if it is damaged (refer to the exploded view diagrams and parts list).
GPS Cover
GPS Cable
GPS Board
GPS Flex
Pull out
Accessory
Lift
Connector
Housing
6 - 11