Motorola Pr400 Basic 6881096c24 A Manual

6881096C24-AAugust, 2004
Limited Keypad Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 7-13
5.Replacing the O-ring.
a. If you have the older chassis (2786389Z01) use the older O-ring (3286431Z02). Position 
the O-ring in the top groove by the volume/frequency switches. Stretch the O-ring to 
place it into the retaining groove at the bottom end of the chassis.
b. If you have the newer chassis (2786389Z02) use the newer O-ring (3286431Z05). Posi-
tion the O-ring with...

July, 20046881096C24-A
7-14Limited Keypad Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General
a. Connect the speaker wire assembly into the 2-pin connector on the main board and 
bend the wires at the board connector so the wires are positioned toward the top of the 
radio (Figure 7-18).
b. Connect the microphone wire assembly into the two hole socket on the main board and 
bend the wires at the board connector so the wires are positioned toward the top of the 
radio...

6881096C24-AJuly, 2004
Limited Keypad Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 7-15
4.Push the topside of the board chassis upward until it touches the housing end. Before snapping 
the board into the housing, perform the following checks:
a. Open the dust cap and ensure the wires are not pinched between the shroud and housing.
b. Ensure the O-ring is seated in the groove.
c. Ensure that the bottom side of the dust cap is fully pressed into the housing before...

August, 20046881096C24-A
7-16Limited Keypad Model Disassembly and Re-assembly: Mechanical View and Parts List
7.5 Mechanical View and Parts List
7.5.1 PR400 Limited-Keypad Exploded View and Parts List
Figure 7-22.  PR400 Limited Keypad Radio Exploded View
1
2829 3132 33
2
3
4
5
6
78
9
1011
12
13
14
15
16
17
18
19
20
21 22 23 25 26 27
30 

Mechanical View and Parts List7-17
6881096C24-AAugust, 2004
ItemMotorola
Part
NumberDescription
1See Section 6Antenna
2 3680530Z02 Knob, Frequency
31386440Z03Escutcheon, Top; 32 Ch.
4 5886627Z01 Antenna Adaptor/Seal 
(Optional)
51586391Z02Housing, Limited, with Lens
6 3586621Z01 Speaker, Felt
73886489Z01PTT, Rubber
8 4586439Z01 PTT, Plastic
90186638Z01Speaker Assembly
10 4286620Z01 Retainer Speaker
113586621Z02Felt, Microphone
12 0780608V01 Boot, Microphone
130186639Z01Microphone Plug Assembly
14...

July, 20046881096C24-A
7-18Limited Keypad Model Disassembly and Re-assembly: Mechanical View and Parts List
This Page Intentionally Blank 

Chapter 8 Non-Keypad Model Disassembly and
Re-assembly
8.1 Introduction
This section provides details about the following:
• Preventive maintenance (inspection and cleaning)
 Safe handling of CMOS and LDMOS devices
 Disassembly and re-assembly of the radio
 Repair procedures and techniques
8.2 Preventive Maintenance
The radios do not require a scheduled preventive maintenance program; however, periodic visual 
inspection and cleaning is recommended.
8.2.1 Inspection
Check that the external surfaces of...

July, 20046881096C24-A
8-2Non-Keypad Model Disassembly and Re-assembly: Safe Handling of CMOS and LDMOS Devices
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (70%) may be applied 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...

6881096C24-AJuly, 2004
Non-Keypad Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 8-3
8.4 Disassembling and Re-assembling the Radio — General
Since these radios may be disassembled and re-assembled with the use of only four (board to 
casting) screws, it is important to pay particular attention to the snaps and tabs, and how parts align 
with each other.
The following tools are required for disassembling the radio (see Chapter 4 for a list of service aids):
 knob...

July, 20046881096C24-A
8-4Non-Keypad Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General
3.Remove the antenna.
4.Pry off the volume and channel selector knobs from their shafts using the knob removal/chassis 
opener tool (Motorola part # 6686533Z01). (Figure 8-2) 
5.Separate the chassis from the front housing assembly by using the knob remover/chassis opener 
too. Place the broad side of the opener into the slots located at the base of the radio (Figure 8-3). 
Press the...