Motorola Vhf 136 174 Mhz Uhf 435 480 Mhz 6881096c38 Manual

Chapter 2 Maintenance
2.1 Introduction
This chapter provides details about the following:
• Preventive Maintenance
• Safe Handling of CMOS and LDMOS Devices
• General Repair Procedures and Techniques
• Disassembling and Reassembling the Radio
2.2 Preventive Maintenance
The radio does not require a scheduled preventive maintenance program; however, periodic visual 
inspection and cleaning is recommended.
2.2.1 Inspection
Check that the external surfaces of the radio are clean, and that all external...

March, 20066881096C38
2-2Maintenance: Safe Handling of CMOS and LDMOS Devices
2.2.2.2  Cleaning Internal Circuit Boards and Components
Apply Isopropyl alcohol (70%) with a stiff, non-metallic, short-bristled brush to dislodge embedded or 
caked materials located in hard-to-reach areas. The brush stroke should direct the dislodged 
material out and away from the inside of the radio. Make sure that controls or tunable components 
are not soaked with alcohol. Do not use high-pressure air to hasten the...

6881096C38March, 2006
Maintenance: Repair Procedures and Techniques — General 2-3
2.4 Repair Procedures and Techniques — General
2.4.1 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 Replacement Parts Ordering 
section of this manual.
2.4.2 Rigid...

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2-4Maintenance: Disassembling and Reassembling the Radio — General
• To replace a chip component using a soldering iron, select the appropriate micro-tipped 
soldering iron and apply fresh solder to one of the solder pads. Using a pair of tweezers, 
position the new chip component in place while heating the fresh solder. Once solder wicks 
onto the new component, remove the heat from the solder. Heat the remaining pad with the 
soldering iron and apply solder until it wicks to the...

6881096C38March, 2006
Maintenance: Radio Disassembly — Detailed 2-5
2.6 Radio Disassembly — Detailed
2.6.1 Front Cover from Chassis Disassembly
1. Turn off the radio.
2. Remove the battery:
a. Slide the battery clasp away from the radio (See Figure 2-1).
b. Slide battery down and away from radio.
3. Remove the antenna.
4. Pull the On/Off Volume knob off of its shaft.
5. Remove the two screws at the back of the rear chassis (See Figure 2-2). Figure 2-1.  
Figure 2-2.  
Insert flathead
to remove chassis....

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2-6Maintenance: Radio Disassembly — Detailed
6. Insert a small flathead screwdriver at the bottom of the radio, between the chassis and 
housing (location marked in Figure 2-2), and lift the chassis gently. Be careful not to damage 
the housing or the O-ring underneath.
7. Lift the rear chassis away from the front cover (See Figure 2-3). Be careful not to damage the 
speaker wire underneath.
8. Slide the rear chassis downwards, and away from the front cover.
9. Remove the speaker...

6881096C38March, 2006
Maintenance: Radio Disassembly — Detailed 2-7
2.6.2 Control Board Disassembly
1. Remove the screws which hold the control board to the RF board.
2. Remove the control board which is connected to the RF board through a board-to-board 
connector (See Figure 2-5).
2.6.3 RF Board Disassembly
1. Remove the screws and the stud which hold the RF board to the rear diecast with the Phillips 
head screwdriver and socket wrench respectively.
2. Gently remove the RF board from rear diecast....

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2-8Maintenance: Radio Disassembly — Detailed
Note:The Control and RF boards are mounted with cross recess screws meeting the Phil-
lips Cross Slot number 1 standard. Using a Phillips 0 will damage the screw recesses 
as will a poorly fitting Phillips 1 screwdriver. One example of a correct fitting screw-
driver is manufactured by PB Baumann (http://www.pbtools.ch/index_e.html) and is 
available from many electronic tool dealers. The PB Baumann item number is 121/1-
70. Other high...

6881096C38March, 2006
Maintenance: Radio Reassembly — Detailed 2-9
2.7 Radio Reassembly — Detailed
2.7.1 RF Board Reassembly
1. Place the RF board on the rear diecast.
2. Tighten the screws and the stud.
2.7.2 Control Board Reassembly
1. Place the control board on the RF board.
2. Connect the control board to the RF board by pressing it firmly downwards at the board-to-
board connector (See Figure 2-7).
3. Tighten the screws using a screwdriver to hold the control board in place.
2.7.3 Chassis and Front...

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2-10Maintenance: Radio Reassembly — Detailed
4. Insert the On/Off shaft and antenna nut into the front cover opening.
5. Lower the front cover closed to the diecase bottom edges.
6. Connect the RF Board to the internal speaker on the front cover with the speaker connector 
(See Figure 2-9).
7. Snap the front cover firmly into place on the rear diecast (See Figure 2-10). Figure 2-9.  
Figure 2-10.  
Speaker
Connector