Motorola Gp300 Basic 68p64115b18b Manual

Chapter 2
INTRINSICALLY SAFE RADIO INFORMATION
1.0 FMRC Approved Equipment
Anyone intending to use a radio in a location where hazardous concentrations of flammable material
exist (hazardous atmosphere) is advised to become familiar with the subject of intrinsic safety and
with the National Electric Code NFPA 70 (National Fire Protection Association) Article 500
(hazardous [classified] locations).
An Approval Guide, issued by Factory Mutual Research Corporation (FMRC), lists manufacturers
and the...

2-2 INTRINSICALLY SAFE RADIO INFORMATION
2.0 Repair of FMRC Approved Products
REPAIRS FOR MOTOROLA FMRC APPROVED PRODUCTS ARE THE RESPONSIBILITY OF
THE USER
You should not repair or relabel any Motorola manufactured communication equipment bearing the
FMRC Approval label (“FMRC Approved Product”) unless you are familiar with the current FMRC
Approval standard for repairs and service (“Class Number 3605”).
You may want to consider using a repair facility that operates under 3605 repair service approval....

Repair of FMRC Approved Products2-3
2.3 Do Not Substitute Options or Accessories
The Motorola communications equipment certified by Factory Mutual is tested as a system and
consists of the FM Approved portable, FM Approved battery, and FM Approved accessories or
options, or both. This Approved portable and battery combination must be strictly observed. There
must be no substitution of items, even if the substitute has been previously Approved with a different
Motorola communications equipment unit....

2-4 INTRINSICALLY SAFE RADIO INFORMATION 

Chapter 3
MAINTENANCE
1.0 Introduction
This chapter 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

Installation of Option Boards
2.0 Preventive Maintenance
The radios do not require a scheduled preventive maintenance program; however, periodic visual
inspection and cleaning is recommended.
2.1 Inspection
Check that the external surfaces of the radio...

3-2MAINTENANCE
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 high-pressure air to hasten the drying process
since this could cause the liquid to collect in unwanted...

Repair Procedures and Techniques—General 3-3
4.0 Repair 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 centre listed in the“Piece Parts”section of this
manual.
Rigid Circuit Boards
This family of radios uses bonded, multi-layer, printed...

3-4MAINTENANCE
If a unit requires more complete testing or service than is customarily performed at the basic level,
send this unit to a Motorola Authorized Service Centre. (See Chapter 1 for a list of authorized
service centres.)
The following disassembly procedures should be performed only if necessary:
Chassis Assembly Disassembly (Paragraph 6.2)
Keypad, Display, and Keypad/Option Board Disassembly (Paragraph 6.3)
Speaker, Microphone, and Universal Connector Flex Disassembly (Paragraph 6.4)
PTT...

Radio Disassembly—Detailed3-5
4.Pull the volume and channel selector knobs off of their shafts.
5.Separate the chassis from the internal electronics front cover assembly as follows:
a. Insert a small, flat-blade screwdriver, or similar instrument, 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 cover by pushing the small flat-blade
screwdriver down, and rotating the handle of...

3-6MAINTENANCE
7.Lift the latches on the main circuit board to release the flexes from their connectors.
6.2 Chassis Assembly Disassembly
1.Use a TORX™screwdriver with a T6 head to remove the four screws holding the main board
to the chassis.
2.Lift the main board from the chassis (See Figure 3-5).
3.Remove the four small O-ring retainers from their slots in the chassis. Note the alignment of
the retainers for reassembly.
4.Remove the O-ring.
5.Slide off the ground contact from the top corner boss of the...