Motorola Cp185 Basic 68007024004 Manual

Chapter 6  Maintenance – CP185
6.1 Introduction
This section provides details about the following:
• Preventive maintenance (inspection and cleaning)
• Safe handling of CMOS and LDMOS devices
• Disassembly and reassembly of the radio
• Repair procedures and techniques
• Mechanical View and Parts List
6.2 Preventive Maintenance
The radios do not require a scheduled preventive maintenance program; however, periodic visual 
inspection and cleaning is recommended.
6.2.1 Inspection
Check that the external...

6-2Maintenance – CP185: Safe Handling of CMOS and LDMOS Devices
Cleaning External Plastic Surfaces
Apply the 0.5% detergent-water solution sparingly with a stiff, non-metallic, short-bristled brush to 
work all loose dirt away from the radio. Use a soft, absorbent, lintless cloth or tissue to remove the 
solution and dry the radio. Make sure that no water remains entrapped near the connectors, cracks, 
or crevices.
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (100%) may be applied...

Maintenance – CP185: Disassembling and Reassembling the Radio – General 6-3
6.4 Disassembling and Reassembling the Radio – General
When disassembling and reassembling the radio, 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 and reassembling the radio (see Chapter 3 for a list 
of service aids):
• Phillips Screwdriver
• Flat Head Screwdriver
• Torque Driver
• Crab Eye Nut Opener (PMDN4039_R)
•...

6-4Maintenance – CP185: Disassembling and Reassembling the Radio – General
6.4.1 Radio Disassembly – Detailed
6.4.1.1  Front Housing From Chassis Disassembly
1.Turn off the radio.
2.Remove the Battery (31):
a. Release the battery latch by moving it into the unlock position.
b. Slide the Battery downwards.
c. Remove the Battery from the radio.
3.Remove the Antenna (22) by turning it counterclockwise.Figure 6-2.  Battery and Antenna Removal
AntennaBelt Clip
BatteryBattery Latch 

Maintenance – CP185: Disassembling and Reassembling the Radio – General 6-5
4.Remove the Volume Knob (7) and Channel Knob (8) from their shafts using the Chassis and 
Knob Opener. (Refer Figure 6-3).
5.Separate the Chassis (27) from the Front Housing Assembly (1):
a. Insert the Chassis and Knob Opener in between the thin retaining wall and the chassis 
at the bottom of the radio. Do not mar the O-ring sealing area on the housing.
b. Slowly pry the bottom of the chassis from the housing by pushing the...

6-6Maintenance – CP185: Disassembling and Reassembling the Radio – General
c. Slide the rear chassis downwards, and away from the front housing. Be careful not to 
damage the Flexible Cable (39) and speaker wire underneath. (Refer Figure 6-5). 
d. Remove the speaker wire connector connecting the main circuit board and the internal 
speaker on the front housing with the tweezers. (Refer Figure 6-6).
e. Lay the front housing down. Rotate the chassis sideways from the Front Housing 
Assembly (1) and lay it...

Maintenance – CP185: Disassembling and Reassembling the Radio – General 6-7
f. Push the latches on the Front Circuit Board (41) sideways to the right to release the 
flexible cable from the connector. (Refer Figure 6-7).
6.4.1.2  Chassis Assembly Disassembly
1.Remove the Accessory Bracket (35).
2.Remove the nut (17) on the On/Off Volume Knob Shaft and Channel Knob Shaft with the Crab 
Eye Nut Opener.
3.Remove the screw holding the Sub Circuit Board (16) to the Chassis (27) with a Phillips 
screwdriver....

6-8Maintenance – CP185: Disassembling and Reassembling the Radio – General
7.Remove the Main Circuit Board from the Chassis.
8.Remove the seven small O-ring retainers from their slots in the Chassis. Note the alignment of 
the retainers for reassembly.
9.Remove O-ring (24) and the Battery Contact Seal (28). (Refer Figure 6-9).
6.4.1.3  Front Circuit Board, Display Module and Keypad Disassembly
1.Push the latches on the Front Circuit Board (41) to release the Liquid Crystal Display (LCD) 
flexible cable...

Maintenance – CP185: Disassembling and Reassembling the Radio – General 6-9
4.Remove the LCD (38), Poron Pad (44) and Keypad (43) from the Front Housing. 
(Refer Figure 6-11).
6.4.1.4  Speaker Disassembly
1.Remove the screw holding the Speaker Retainer (11) to the Front Housing with a Phillips 
screwdriver.
2.Remove the Speaker Retainer from the Housing.
3.Remove the Speaker from the Housing with a flat head screwdriver.
4.Remove the Speaker Insulator (12) from the speaker.Figure 6-11.  LCD and Keypad...

6-10Maintenance – CP185: Disassembling and Reassembling the Radio – General
5.Remove the Speaker Felt (9) from the grille area. (Refer Figure 6-12).
Figure 6-12.  Speaker Removal
Speaker Retainer
Speaker 
Speaker Felt
Speaker Insulator