Radio Assembly; Cdm750 Control Head; Cdm1250, Cdm1550, Cdm1550•Ls, And Cdm1550•Ls+ Control Heads; Radio Chassis And Transceiver Board - Motorola CDM Series Basic Service Manual

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5. Remove the display from the control head housing.
Note: DO NOT touch or contaminate the conductive pads on the under side of the keypad
or the conductive contacts on the printed circuit board.
2.7

Radio Assembly

2.7.1 CDM750 Control Head

1. Locate the speaker in the control head and press it into place as shown in Figure 2-8.
2. Insert the keypad into the control head ensuring that the keypad keys and connector cut-out fit
correctly.
Note: DO NOT touch or contaminate the conductive pads on the underside of the keypad.
3. On the board, rotate the on/off control spindle fully counter-clockwise.
4. Rotate the volume knob on the housing fully counter-clockwise
5. Align the board with the control head and insert the on/off control spindle through the hole in the
keypad.
6. Locate the two snap tags on the board in the grooves in the control head and press the board into
place until all of the tags snap into place.
7. Connect the speaker connector to the connector on the board.
2.7.2 CDM1250, CDM1550, CDM1550
1. Locate the display in the control head ensuring that the two cut-outs in the display are aligned
with their corresponding indentations, then press the display into place.
Note: DO NOT touch or contaminate the conductive pads on the underside of the display.
2. Fit the rubber keypad onto the board ensuring that the on/off control and accessory connector on
the board locate correctly with the cut-outs in the keypad.
3. On the board, rotate the on/off control spindle fully counter-clockwise.
4. Rotate the volume knob on the front housing counter-clockwise.
5. Align the board (with the rubber keypad attached) with the control head, inserting the on/off con-
trol spindle and accessory connector through the holes in the control head.
6. Ensure that the keypad, on/off control spindle and microphone connector are aligned with the
control head then press the board into place until it clicks.
7. Insert the speaker and speaker tube with speaker into the control head and press it in until it
clicks.
8. Connect the speaker connector to the board.

2.7.3 Radio Chassis and Transceiver Board

1. Inspect the transceiver board and if required reapply thermal grease to the heatsink area on the
chassis and heat dissipating devices. You may have to scrap existing thermal pad from the chas-
sis prior to applying the grease.
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. Secure the cover to the chassis with the six screws previously removed.
•
LS, and CDM1550
+
•
LS Control Heads
Maintenance