Motorola Gm300 Basic 68p64115b51 Manual

							Radio Disassembly - Detailed3-5
Figure 3-2Flexible Connection Removal
4. Remove the flexible connection from the socket on the control head board.
6.2 Top Cover Removal
1. Insert the dismantling tool in the middle of the radio assembly side groove as shown in
Figure 3-3.
2. Press on the dismantling tool until the snap connectors on the side of the cover release from
the radio chassis.
3. Lift the top cover from the chassis.
Figure 3-3To p C o v e r R e m o v a l .
Flexible
Connection
ZWG0130210-O
Dismantling
To o l
ZWG0130211-O 
						

							3-6MAINTENANCE
6.3 Transceiver Board Removal
1. Remove the screws securing the diecast cover to the chassis, using the T20 TORX™ driver
asshowninFigure3-4.
2. Lift the cover from the chassis.
Figure 3-4Diecast Cover Removal.
3. Slowly lift the transceiver board on the edge at the front of the radio (the edge that mates with
the control head) and pull gently toward the front of the radio as shown in Figure 3-5. Take
care to slide the antenna connector and power connector out of the chassis towards the front.
Figure 3-5Transceiver Board Removal
CAUTION: The thermal grease or pads can act as an adhesive and cause the leads of the heat dis-
sipating devices to be over stressed if the board is lifted too quickly.
Diecast
Cover
Screws (6 on 25W models)
Radio
Chassis
ZWG0130212-O
(9 on 60W models)
Lift
Antenna
Connector
ZWG0130213-O 
						

							Radio Disassembly - Detailed3-7
6.4 Disassembly of Control Head - GM340 (without display)
1. To dismount the control head housing from the back housing, insert the dismantling tool in the
groove between the two housings as shown in Figure 3-6.
Figure 3-6Control Head Back Housing Removal
2. Press the dismantling tool until the snap connectors on the side of the back housing release
from the control head.
3. Disconnect the speaker socket.
Figure 3-7Control Head Board Removal
4. Remove the board from the control head housing by stretching the control head housing and
pulling up on the board as shown in Figure 3-7 and 3-8.
5. Remove the keypad from the control head housing by lifting up the rubber keypad.
NOTE
Care should be taken not to touch or contaminate the conductive pads on the under side of
the keypad or the conductive contacts on the printed circuit board.
ZWG0130214-O
ZWG0130215-O 
						

							3-8MAINTENANCE
Figure 3-8Board, Keypad and Speaker Removal
6. Remove the speaker from the control head housing.
6.5 Disassembly of Control Heads - GM360 and GM380 (with display)
1. Dismount the control head housing from the back housing as described for control heads
without displays, Figure 3-6 and 3-7.
2. On the GM360, disconnect the speaker socket and pull out the speaker (with speaker tube)
by stretching the control head housing, Figure 3-9.
Figure 3-9Speaker and Speaker Tube Removal
3. Remove the board from the control head housing by stretching the control head housing and
pulling up on the board.
4. Remove the keypad from the control head housing by lifting up the rubber keypad.
NOTEThe speaker and speaker tube are glued together to form one unit. (GM360 only)
ZWG0130216-O
ZWG0130218-O 
						

							Radio Assembly3-9
5. Remove the display and the top and bottom elastomeric connectors from the control head
housing (GM360 only).
7.0 Radio Assembly
7.1 Control Head - GM340
1. Locate the speaker in the control head and press it into place as shown in Figure 3-8.
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. Also, 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.
7.2 Control Heads - GM360 and GM380
1. On the GM360 only, 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.
Insert the top and bottom elastomeric connector strips into the spaces above and below the
display respectively.
2. Fit the rubber keypad onto the board ensuring that the on/off control and microphone
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. Also, rotate the volume knob on the front housing fully counter-clockwise.
5. Align the board with the control head, inserting the on/off control spindle and microphone
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. On the GM360, insert the speaker tube and speaker into the control head and press it in until
it clicks.Connect the speaker connector to the board. NOTE
Care should be taken not to touch or contaminate the conductive pads on the under side of
the keypad, the elastomeric connectors or the conductive contacts on the printed circuit
board .
NOTE
Care should be taken not to touch or contaminate the conductive pads on the underside of
the keypad.
NOTE
Care should be taken not to touch or contaminate the conductive pads on the underside of
the display and the elastomeric connectors (GM360 only). 
						

							3-10MAINTENANCE
7.3 Radio Chassis and Transceiver Board
1. Inspect the transceiver board chassis and if required reapply thermal grease to the heatsink
area on the chassis and heat dissipating devices. You may have to remove damaged thermal
pads from the chassis and devices prior to applying the grease.
2. Inser t 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.
5. Torque the six screws to 1.9 NM (17 in lbs) 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.
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
assemblyasshowninFigure3-2.
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).
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. 
						

							Radio Exploded Mechanical Views and Parts Lists 3-11
8.0 Radio Exploded Mechanical Views and Parts Lists
8.1 Radio Assembly - 25W Models
Figure 3-10Radio Assembly - 25W Models
Ta b l e 3 - 1Radio Assembly Parts List - 25W Models
Item No. Description Part Number
1Chassis 25W2786082B02
2 Gasket, Controlhead 3202620Y01
3Main PCB (items 4 to 10 included)
4 Antenna Connector with Gasket, BNC 0986166B01
5Power Connector0986165B01
6 Connector 20 PIN 0986105B01
7Connector Assembly2886122B02
8 Gasket Cover 3202607Y01
9Connector1580922V01
10 Gasket Accessory Connector 3202606Y01
11Gasket Cover 25W3286086B01
12 Cover 25W 1586084B01
13Cover, Plastic 25W1586083B01
14 Screw T20, 6x (M4) 0310911A30
15Screw T8 Power Device Fastner
(some models only)0310911A12
16 Silicon Pressurepad, Power devices
(25W cover only)7586187B01
ZWG0130202-A
11 12 13910
1
2 3 4 5 678
14
15
16 
						

							3-12MAINTENANCE
8.2 Radio Assembly - 60W Models
Figure 3-11Radio Assembly 60W Models
Ta b l e 3 - 2Radio Assembly Parts List - 60W Models
Item No. Description Part Number
1Chassis 60W2786149B01
2 Gasket, Controlhead 3202620Y01
3Main PCB (items 4, 5 and 8 included)
4 Antenna Connector, Mini UHF 0986166B02
5Power Connector0986165B01
6 Connector 20 PIN 0986105B01
7Connector Assembly2886122B01
8 Gasket Cover, Connector 3202607Y01
9Connector1580922V01
10 Gasket Accessory Connector 3202606Y01
11Gasket Cover 60W3286152B01
12 Cover 60W 1586150B01
13Cover, Plastic 60W1586151B01
Screw T20, 9x (not shown) 0310911A30
ZWG0130203-A
11 12 13
9 10
1
2 3 45
678 
						

							Radio Exploded Mechanical Views and Parts Lists 3-13
8.3 Control Head - GM340
Figure 3-12Control Head GM340
Ta b l e 3 - 3Control Head GM340 Parts List
Item noDescriptionPart No
1Housing Front, including:
Gasket, Lens, Lightguide1586086B01
2Knob, Volume3686098B02
3Label1364279B13
4Speaker5086126B01
5Keypad, including
Keypad Button7586089B01
3886133B--
6PCB KitGLN7350_
7Potentiometer1805911V02
810 PIN Microphone Jack2864287B01
9Flex 12 Position Connector
(Controlhead to Radio)8486127B01
10Backhousing, including:
Back Housing O-ring
Back Housing ,Grounding Clip1586092B02
3286094B01
3286217B01
ZWG0130198-A
 
1
2
346 7
5
9 810 
						

							3-14MAINTENANCE
8.4 Control Head - GM360
Figure 3-13Control head - GM360
Ta b l e 3 - 4Control Head GM360 Parts List
Item no Description Part No.
1Housing Front
Gasket, Lens, Lightguide1586088B01
2 Knob, Volume 3686098B02
3Label1364279B14
4 Speaker 5086126B01
5Tube, Speaker with Gasket3786107B01
6 Keypad, including:
Keypad Button7586091B02
3886134B--
7LCD Glass7286104B01
8 Frame LCD 0786099B01
9Conn. Elastomeric (Top and Bottom)2886130B01
2886130B02
10 Back Housing, including: 1586093B02
Back Housing, O-ring 3286094B01
Back Housing, Grounding Clip 3986218B01
11PCB KitGLN7353_
12 Potentiometer 1805911V02
1310 PIN Micphone Jack2864287B01
(not shown) Flex, 12 Position Connector
(Controlhead to Radio)8486127B01
ZWG0130200-A
12
34
5
678 10
11
12
13
9