Motorola MTX850LS 用户手册

3-6

Maintenance

1.

If disassembly of the chassis or the main board is required, then use a TORX™ screwdriver with 
a T6 head to remove the four screws holding the main board to the chassis.

2.

Lift the main board from the chassis (refer to Figure 3-5).

3.

Remove the small O-ring retainers from their slots in the chassis. Note the alignment of the 
retainers for reassembly.

4.

Remove the O-ring.

5.

If required in disassembly, slide off the ground contact from the top corner boss of the radio 
chassis.

1.

If the disassembly of the keypad or the keypad printed circuit board, is required, lift the 
microphone flex circuit up, and carefully remove the microphone and its boot from the front cover 
pocket. (See Figure 3-6 on page 3-7).

2.

Lay this flex circuit to one side.

(See section 3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure) on page 
3-12).

CAUTION:  Refer to the CMOS CAUTION in paragraph on page 3-2 before removing 
the main board. Be sure to use electrostatic discharge (ESD) protection when 
handling circuit boards.

Main

 

Board

Screws (4)

Radio
Chassis

O-Ring
Retaining
Features

Compliant
Ground
Contact