Motorola Gp1280 Basic 68p64115b27a Manual
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Radio Disassembly—Detailed3-7 6.3 Keypad, Display, and Keypad/Option Board Disassembly 1.If the disassembly of the keypad, the keypad printed circuit board, or the display 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.) 2.Lay this flex circuit to one side. 3.To remove the keypad retainer shield: a. Insert the tip of a“penknife size,”flat blade screwdriver in the opening at the end of the keypad retainer arm tab. b. Pry the tab away from the side of the front cover until it moves past the ledges on the side wall. Duplicate this procedure for each of the four retainer arm tabs. 4.Note that the two“top hooks”are still held underneath the front cover, right below the speaker. Lift the keypad retainer out of the front cover; then, lift and pivot the two hooks out of the front cover. 5.If disassembly involves the removal of the display module, disconnect the display flex from the keypad option board connector by lifting the latch on the connector. (This is similar to the process for releasing the flexes.) 6.The display module is attached to the front cover with a double-sided adhesive pad. Carefully pull up on the display module, using a small screwdriver, if necessary, and remove it from the front cover. Use a new piece of double-sided adhesive to re-mount the display to the cover.Figure 3-6Remove Retainer CAUTION: Take care not to damage the display. Do not cut, bend, or pinch the heat seal. Display modules contain CMOS devices. Be sure to use ESD protection. Keypad Retainer Arm Tabs (4) Retainer Top Hooks RetainerFlat Blade Screwdriver Speaker-Microphone Flex Circuit Tail !
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3-8MAINTENANCE 7.The keypad/option board, and the keypad, can be removed without the use of tools. 6.4 Speaker, Microphone, and Universal Connector Flex Disassembly 1.Turn the screw at the bottom of the dustcover counterclockwise with your fingers. Lift the dustcover out of its pocket. 2.Using a screwdriver, push down on the portion of the speaker retainer bracket pointing toward the bottom of the radio. Then, remove the retainer by slightly pushing it toward the top of the radio until you slide it past the front cover slot. 3.Pull the rubber microphone boot from its seated position. Unless you are replacing the microphone, leave it in the boot. 4.Peel-off the universal connector flex circuit escutcheon (label). 5.Pry the flex circuit (adhesive held) backer board away from the front cover, and remove the universal connector tail of the speaker-microphone assembly through its opening in the front cover. Figure 3-7Removing the Keypad Retainer and Other Boards from the Radio Body NOTEAt this point, the Option Board Installation Procedure should be performed, if necessary. NOTEThe dustcover must be removed to remove the speaker-microphone assembly flex circuit. The speaker is held in place with a two-legged retainer bracket. The bracket legs are secured by the front cover slots. Be careful not to damage the speaker when removing the retainer bracket. NOTEThe speaker-microphone assembly flex circuit goes through the front cover wall to the outside wall. To replace this assembly, you must peel-off the universal connector escutcheon label. The existing escutcheon cannot be reassembled; a new part must be used. (See item number 10 on the exploded view drawing.) Keypad/Option Board Retainer Display Module Keypad Radio Body 1 2 3
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Radio Disassembly—Detailed3-9 6.After the universal connector tail of the speaker-microphone assembly is removed, the assembly can be completely removed. If it is necessary to replace the speaker or microphone, or both, do it while the flex circuit is removed from the front cover. When reassembling the microphone in its boot, make sure the microphone port faces the round hole in the bottom of the boot. 6.5 PTT Disassembly 1.If required, the PTT bezel, and the PTT seal assembly, can be disassembled using a small screwdriver, as follows: a. Pry back the T-tab found inside the front cover (in between the four buttons on the PTT assembly). b. Remove the PTT bezel by slightly bowing it until the top and bottom tabs are released from the slots in the front cover. c. The PTT seal can be easily lifted from the bezel without the use of tools.Figure 3-8Removal Speaker-Microphone Assembly Figure 3-9PTT Removal SpeakerNotch In Speaker @ 12:00 Speaker Orientation Tab @ 12:00 Microphone BootUniversal Connector Tail Microphone Speaker Microphone Flex Circuit Assembly TabPTT Bezel Tab T Shaped Retainer Tab PTT Seal
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3-10MAINTENANCE 6.6 Control Top Disassembly 1.To remove the control top assembly, place a screwdriver next to the antenna boss, and pry it against the control top escutcheon. This will lift the control top escutcheon away from its double-sided adhesive. Grab the double-sided adhesive near the volume potentiometer, and lift it away. 2.Remove the control top seal, emergency button, and transmit light pipe. 7.0 Radio Reassembly — Detailed 7.1 PTT Reassembly 1.Replace transmit light pipe and control top seal. 2.Place a new control top escutcheon adhesive against the front cover. Press the control top escutcheon tightly against the adhesive. 3.Put the PTT seal in the PTT bezel. 7.2 Control Top Reassembly 1.Place the bezel top tab in the top slot inside the front cover PTT opening. Slightly bow the bezel so that the bottom tab can fall inside the bottom slot. 2.Press the PTT assembly against the front cover opening. 7.3 Speaker, Microphone, and Universal Connector Flex Reassembly 1.Feed the universal connector tail of the speaker-microphone flex assembly through the opening in the side wall of the front cover. 2.Peel-off the adhesive liner on the back of the universal connector tail of the flex circuit. Attach the flex tail to the front cover using the guide pins for correct alignment. 3.Replace the universal connector escutcheon. Make sure that all the connector openings align with the gold pads on the flex circuit. 4.Align the notch in the speaker at the twelve o’clock position with the tab on the front cover. (See Figure 3-8). 5.Place the speaker retainer bracket into the hole on the top of the front cover, and bend the retainer down to fit underneath the boss below the speaker. 7.4 Keypad, Display, and Keypad Option Board Reassembly 1.If you are replacing the display, use a new double-sided adhesive display pad (item number 17 on the exploded view diagram). 2.Replace the keypad, and the keypad/option board. Make sure the display module flex tail is connected correctly to the connector on the keypad/option board. 3.Insert the“top hooks”of the keypad retainer into the slots below the speaker (above the display) in the front cover. Snap all four of the retainer arm tabs in place in the front cover. NOTELook inside the front cover to make sure the T-tab is fully engaged with the front cover. If necessary, press the T-tab toward the top of the radio until it becomes fully engaged.
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Radio Reassembly—Detailed3-11 4.Re-insert the microphone and boot into the pocket in the front cover. 5.Lay the speaker-microphone flex on top of keypad/option board retainer. 7.5 Chassis Assembly Reassembly 1.Slide on the ground contact (if necessary) on the top corner boss of the chassis. 2.Replace the O-ring. The tabs on the O-ring should reach around the chassis and point down. 3.Stretch the O-ring to place it into the retaining pocket at the bottom end of the chassis. 4.Ensure that the antenna nut insulator is correctly replaced by pushing it all the way to the top of the antenna nut. 5.Replace the battery contact seal (if necessary) surrounding the battery contact. 6.Place the main circuit board straight down on top of the chassis. 7.Use the T6 TORX screwdriver to fasten the screws holding the main board to the chassis. 7.6 Chassis and Front Cover Reassembly 1.Align the chassis assembly end-to-end with the front cover assembly. 2.Insert the tails of the flex circuits into their respective connectors at the bottom of the front cover. 3.Push down the latches on the connectors to hold the flex circuits to the main board. 4.Slide the volume potentiometer and frequency switch shafts into their respective holes in the front cover. NOTEPull the speaker-microphone flex circuit out of harm’s way during reassembly. Figure 3-10Lock retainer catches to the radio’s body NOTEWhen properly assembled, the retainers on the O-ring should align with the slots on the chassis. If this is not the case, remove and replace the O-ring until it is aligned with the chassis and completely seated in place around the perimeter. NOTEBe sure the battery contact seal protrudes through the chassis and is not pinched under the chassis. Catches Retainer
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3-12MAINTENANCE 5.Push the chassis assembly completely into the top of the front cover until it settles in place. 6.Be sure the O-ring is properly seated. 7.Snap the bottom of the chassis into the front cover. 8.Reassemble the knobs, dust cover, antenna, and battery. 8.0 Option Board Installation 1.With the keypad retainer removed, the keypad backer board can be removed without the use of tools. 2.Remove the jumper flex from the connector on the keypad board. Notice the orientation of the flex to the connector. Arrows on the jumper flex point to the correct way of inserting the flex into the connector. 3.Discard the keypad backer board. 4.The“breakaway”tab at the top of all option boards contains an extra row of keys and is used to accommodate other radio models. 5.Break-off and discard the option board tab, taking care not to damage the option board. Trim any tab fragments that may remain on the option board.Figure 3-11Fastening the Chassis Radio Chassis
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Option Board Installation3-13 6.Reassemble the option board to the front cover assembly. 7.Insert the display flex circuit into the connector on the option board. 8.Insert the jumper flex circuit into the connector on the option board. Notice the orientation of the flex circuit. Arrows on the jumper flex point to the correct way of inserting the flex into the connector. 9.Replace the retainer by placing the two top hooks into the slots below the speaker in the front cover; then, pivot the retainer into the front cover. Ensure that all four tab arms snap correctly into the front cover. 10.With the keypad option board, display, and retainer correctly in place, the front cover assembly can now be reassembled as described in Paragraph 7.6 (Chassis and Front Cover Reassembly).Figure 3-12Changing the Keypad/Option Board Retainer Keypad/Option Board Display FlexJumper Flex TO KP
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3-14MAINTENANCE 9.0 Mechanical View and Parts List 9.1 GP1280 Exploded View and Parts List Figure 3-13GP1280 Radio Exploded View 1 2 3 4 5 6 7 8 910 11 121314 15 1617 18 19 20 21 22 2324 2526 2728 29 30 3132 33 3435 3637 384041 42 43 44 39
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Mechanical View and Parts List3-15 ItemMotorola Part NumberDescription 1See Chapter 6Antenna 2 3280529Z01 Knob, Volume 33280530Z01Knob, Frequency 4 1380525Z01 Escutcheon, Top (16CH) 1380525Z03Escutcheon, Top (Dotted) 5 3380644Z01 Escutcheon, Label 63280533Z01Seal, Control Top 7 6180527Z01 Litepipe, Tx 81364279B09Nameplate, GP1280 9 1586059A01 Dust Cover, Univ Conn 101386058A01Escutcheon, Univ Flex 11 1580666Z05 Front Cover 121380649Z01*Escutcheon, FM 13 7580532Z01 Keypad, Side Control 141380528Z01Bezel, Side Control 15 7586065A01 7586065A02Keypad 160104008J38Keypad Board Assembly 17 5105385Y57 LCD Module 187585659Z01Pad, Retainer Front 19 4285660Z01 Retainer, Keypad Board 207585659Z02Pad, Retainer Back 21 3586057A01 Felt, Speaker 223586170A01Felt, Mic 23 1405368W01 Boot, Mic 245085962A02Speaker 25 5005227J08 Microphone 268480549Z01Flex, Univ Conn 27 2113740A41 Cap, 33pF 284280504Z01Retainer, Speaker 29 1480503Z01 Boot, Backup Battery 306062884G01Backup Battery 31 0304726J04 Screw 323980667Z01Contact, Finger (For UHF) 33 Typical Ctrl/RF Board Assembly 348485615Z01Flex, Keypad/Controller 35 1480652Z01 Insulator, Antenna 367580556Z01Pad, Thermal 37 3280534Z01 Seal, Contact 383380564Z01Label, Warning 39 3280536Z02 Gasket, O-Ring 403980698Z01Contact, Ground (For VHF) 41 2780518Z02 Chassis 421586178A01Shroud, Chassis 43 See Chapter 6 Battery 44HLN9714Beltclip *Not field-replaceable ItemMotorola Part NumberDescription
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3-16MAINTENANCE 10.0 Service Aids Table 3-1 lists the service aids recommended for working on the GP1280 Radio. While all of these items are available from Motorola, most are standard shop equipment items, and any equivalent item capable of the same performance may be substituted for the item listed. Ta b l e 3 - 1Service Aids Motorola Par t No.Description Application RLN4460_Por table Test SetEnables connection to the audio/accessory jack. Allows switching for radio testing. RKN4075_ Ribless Programming Cable Connects radio to Computer. RKN4074_Programming Cable/Test CableConnects radio to RIB (RLN4008). RLN4008_ Radio Interface Box (RIB) Enables communications between the radio and the computer’s serial communications adapter. HLN9756_BNC AdaptorAdapts radio’s antenna port to BNC cabling of test equipment. HKN9743_ MAP27 Cable Conects radio to computer for MAP27 applications in MPT requirements. HLN9742_Flash upgrade cableProvides connections to the computer or RIB programming /test cable 0180305G54 Shop Battery Eliminator Interconnects radio to power supply. 8180384F66Bench Test Housing Eliminator for long housing.Provides for troubleshooting of the radio when the housing is removed. 8180384F68 Bench Test Housing Eliminator for short housing.Provides for troubleshooting of the radio when the housing is removed. RLN4510_Battery Eliminator 7.5VInterconnects radio to power supply. EPN4040_ Wall-Mounted Power Supply Used to supply power to the RIB (UK). EPN4041_Wall-Mounted Power SupplyUsed to supply power to the RIB (Euro) 3080369B71 or 3080369B72Computer Interface Cable Use B72 for the IBM PC AT. All other IBM models use B71. Connects the computer’s serial communications adapter to the RIB. (RLN4008)