Motorola Cdm Series Basic 6881091c62 D Manual

							Maintenance2-9
Figure 2-8: Board, Keypad and Speaker Removal
6. Remove the speaker from the control head housing.
2.6.5 CDM1250, CDM1550, CDM1550•LS, and CDM1550•LS+ Control Head 
Disassembly
1. Dismount the control head housing from the back housing as described for control head 
CDM750, Figure 2-6.
2. Disconnect the speaker socket and remove the speaker (Figure 2-9) with tube by stretching the 
control head housing and pulling out the tube.
Figure 2-9: Speaker and Speaker Tube Removal
3. Remove the board from the control head housing by stretching the control head housing and pull-
ing up on the board as described for control head CDM750, Figure 2-8.
4. Remove the keypad from the control head housing by lifting up the rubber keypad. 
						

							2-10Maintenance
5. Remove the display from the control head housing.
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.
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•LS, and CDM1550•LS+ Control Heads 
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.
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. 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.
Note:
DO NOT touch or contaminate the conductive pads on the underside of the keypad.
Note:
DO NOT touch or contaminate the conductive pads on the underside of the display. 
						

							Maintenance2-11
5. Torque the six screws to 17 in lbs. (1.9 NM) using the T20 TORX™ driver. Begin with the two 
screws located in the middle of the chassis followed by the four outer screws. Since the screws 
usually take a set, torque the screws a second time (1.9 NM) in the same order.
6. Refit the top cover over the assembled radio chassis. Press the cover down until it snaps into 
place.
2.7.3.1 LowBand Radio Chassis and Transceiver Board Assembly
1. Inspect the transceiver board. If the LDMOS final devices (Q1402 and Q1403) were replaced, see 
Section 2.6.3.2 as how to replace the thermal pad if necessary. 
2. Insert the transceiver board at an angle (approximately 30°) into the radio chassis taking care to 
slide the antenna connector and accessory connector into their cut-outs in the radio chassis.
3. Lower the transceiver board onto the radio chassis and align the two locating holes in the trans-
ceiver board with the locating pins in the radio chassis.
4. Replace the 20-pin accessory connector. Make sure the connector is fully engaged in its opening 
before replacing the die cast cover.
5. Replace the die cast cover over the radio chassis making sure the black carbon on the bottom of 
the pressure pad is positioned properly over the switch printed on the transceiver board. 
6. Secure the die cast cover to the radio chassis with the nine screws previously removed.
7. Torque the nine screws to 17 in lbs (1.9 NM) using the T20 TORX™ driver. Tighten the die cast 
cover screws in the sequence labeled on the top of the cover or as shown in Figure 2-10. Since 
the screws take a set it is importance to torque the screws a second time (17 in lbs) in the same 
order.
8. Insert the plastic protective cover into the 18-pin connector located at the front of the radio chas-
sis.
9. Refit the top cover over the assembled radio chassis. Press the cover down until it snaps into 
place.
10. Replace the Control Head per Section 2.7.4.Note:
Thermal grease used with the chassis eliminator, 8180384J61, must be completely 
removed from all devices. DO NOT USE THERMAL GREASE on the radio chassis. 
This may cause instability of the transmitter under certain load conditions.
Note:
The B02 version of the die cast cover will have locating pins to hold the pressure pad 
in place on the die cast cover. This will automatically align the pressure pad on the 
switch. 
						

							2-12Maintenance
Figure 2-10: Top view of the LowBand radio chassis and die cast cover showing the screw sequence
2.7.4 Control Head Fitting
1. Align the “0” mark on the flex with the “0” mark on the chassis to the socket on the radio assembly 
as shown in Figure 2-2.
2. Check that the back housing o-ring seal is undamaged and fitted in the groove. Replace the seal 
if it is damaged (for more information, please see the exploded view diagrams and parts list 
beginning in section 2.9 CDM750 Radio Control Head Exploded Mechanical View and Parts List  
on page 14 of this chapter).
3. Fit the back housing to the control head. Ensure that the tags on the back housing align with the 
snap catch grooves on the control head. Press the back housing into place until it snaps into 
place.
4. Check that the radio chassis o-ring seal is undamaged and fitted in the groove on the chassis 
assembly. Replace the seal if it is damaged.
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