Motorola 6816101H01-A service manual Repair Procedures and Techniques General

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Repair Procedures and Techniques — General

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4.0Repair Procedures and Techniques — General

Parts Replacement and Substitution

When damaged parts are replaced, identical parts should be used. If the identical replacement part is not locally available, check the parts list for the proper Motorola part number and order the part from the nearest Motorola Communications parts center listed in the Piece Parts section of this manual.

Rigid Circuit Boards

This family of radios uses bonded, multi-layer, printed circuit boards. Since the inner layers are not accessible, some special considerations are required when soldering and unsoldering components. The printed-through holes may interconnect multiple layers of the printed circuit. Therefore, exercise care to avoid pulling the plated circuit out of the hole.

When soldering near the 20-pin and 40-pin connectors:

•Avoid accidentally getting solder in the connector.

•Be careful not to form solder bridges between the connector pins.

•Examine your work closely for shorts due to solder bridges.

Flexible Circuits

The flexible circuits are made from a different material than the rigid boards, and require different soldering techniques. Excessive prolonged heat on a flexible circuit can damage the material. Therefore, avoid excessive heat and excessive bending.

For parts replacement, use the ST-1087 Temperature-Controlled Solder Station with a 600-700

degree F tip, and use small diameter solder such as ST-633. The smaller size solder will melt faster and require less heat to be applied to the circuit.

To replace a component on a flexible circuit:

1.Grasp with seizers (hemostats) the edge of the flexible circuit near the part to be removed.

2.Pull gently.

3.Apply the tip of the soldering iron to the component connections while pulling with the seizers.

NOTE Do not attempt to puddle-out components. Prolonged application of heat may damage the flexible circuit.

Chip Components

Use either the RLN-4062 Hot-Air Repair Station or the Motorola 0180381B45 Repair Station for chip component replacement. When using the 0180381B45 Repair Station, select the TJ-65 mini- thermojet hand piece. On either unit, adjust the temperature control to 700 degrees F. (370 degrees C), and adjust the airflow to a minimum setting. Airflow can vary due to component density.

•To remove a chip component, select a hot-air hand piece and position the nozzle of the hand piece approximately 1/8” above the component to be removed. Begin applying the hot air. Once the solder reflows, remove the component using a pair of tweezers. Using solder wick and a soldering iron or a power desoldering station, remove the excess solder from the pads.

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Contents Mag One by Motorola Radio Series Computer Software Copyrights Document History Page Federal Communication Commission FCC Regulations Safety InformationGuidelines Compliance with RF Exposure StandardsElectromagnetic Interference/Compatibility Use of communication devices while driving Operational WarningsHearing Aids Other Medical DevicesIntrinsically Safe Radio Information Operational CautionsOperational Cautions for Intrinsic Safe Equipment Repair Do Not Substitute Options or AccessoriesTable of Contents Glossary of Terms Radio ProgrammingScope of Manual Warranty and Service SupportWarranty Period and Return Instructions IntroductionFurther Assistance From Motorola After Warranty PeriodPiece Parts Technical SupportUnit Level Radio Model InformationCPS Radio FeaturesIntroduction MaintenancePreventive Maintenance Cleaning ProceduresSafe Handling of Cmos and Ldmos Devices Repair Procedures and Techniques General Disassembling and Reassembling the Radio General Radio Disassembly Detailed Radio Disassembly DetailedFront Cover from Chassis Disassembly Speaker Wire Radio Disassembly Detailed PC Board Disassembly Radio Reassembly DetailedPC Board Reassembly Chassis and Front Cover Reassembly Radio Reassembly Detailed Speaker Connector Part Name Qty Mechanical View and Parts ListExploded View and Parts List ReferenceReference Part Name Qty Reference Part Name Qty PMUD2221A PMNN4071RCMotorola Part Service AidsDescription Application Test Equipment Motorola Description Characteristics ApplicationProgramming Cable PMDN4043R Test Box PMDN4040R Cloning Cable PMDN4060R otesRadio Tuning Tuning Frequency Hardware Tuning Setup and ProcedureGround Contact Finger R425 R426 R216 FL701 R215 TP1 Subtone Level 42 ± 0.02kHz 96 ± 0.02kHz R425 R426 C722 Page Programming Your Radio Radio ProgrammingKit Number CPS ProgrammingCPS Programming Setup Factory ResetFactory Reset Accessories Service Kits Audio AccessoriesPublications LAH84JDC8AA4AN Model Chart and Test SpecificationVHF Band 1 Information 136-150 MHz A8 136-150 MHz VHF Model DescriptionReceiver SpecificationsGeneral TransmitterLAH84KDC8AA4AN VHF Band 2 Information 150 174 MHz A8 150-174 MHz VHFSpecifications LAH84QCC8AA4AN UHF Band 1 Information 403-425MHz A8 403-425 MHz UHFUHF UHF Band 2 Information 450 470MHz A8 450-470 MHz UHF Specifications LAH84TCC8AA4AN UHF Band 4 Information 490 512 MHz A8 490-512 MHz UHFPMAE4028A Specifications PLL ResetGlossary of Terms Term DefinitionVHF ROMTPL UHF
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