Motorola Portable Radio Ep450 Basic Hkln4215a Manual

December 3, 2003HKLN4215A
7-8Non-Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General
7.4.3 Radio Re-assembly - Detailed
7.4.3.1  Dust Cover Re-assembly
1.Insert the tail of the dust cap into the bottom hole of the audio jacks housing opening (Figure 7-9).
2.Press the dust cap until the tail is fully into the hole.
3.Twist the dust cap counter-clockwise until the cap is seated properly onto the recess.
4.Press the cap again to ensure it fully covers the opening...

HKLN4215ADecember 3, 2003
Non-Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 7-9
.
6.Insert one end of the speaker retainer into the slot in the front housing (See Figure 7-11)..
7.Install the retainer screw using a T6 Torx screwdriver. Torque to 2.3 - 2.5 lb/in.
7.4.3.3  Chassis Assembly/Re-assembly
1.Replace the battery contact seal (if necessary) surrounding the battery contact (Figure 7-12).
2.Remove the old Interface Pad from the chassis by scraping...

December 3, 2003HKLN4215A
7-10Non-Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General
.
7.4.3.4  Chassis and Front Cover Re-assembly
8.Dress and connect the speaker wires.
a. Connect the speaker wire assembly into the 10-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 7-13). 
b. Connect the microphone wire assembly into the two hole socket on the main board and 
bend the...

HKLN4215ADecember 3, 2003
Non-Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 7-11
12.Snap chassis assembly completely into the top of the front cover (Figure 7-14) until it settles in 
place.
13.Make sure the O-ring is properly seated. If the O-ring seal is pinched, separate the chassis from 
the housing using the knob removal/chassis opener and dress O-ring properly.
14.Snap the bottom of the chassis into the front cover.
15.Check that O-ring is visible at...

December 3, 2003HKLN4215A
7-12Non-Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General
3.Press the PTT assembly against the front cover opening (Figure 7-15b).
Figure 7-15.  PTT Re-assembly a. Place bottom tab into bottom slot.
Place top tab into top slot.b. Push down on PTT toward bottom
of radio so hooks do not get crushed. 

HKLN4215ADecember 3, 2003
Non-Display Model Disassembly and Re-assembly: Mechanical View and Parts List 7-13
7.5 Mechanical View and Parts List
7.5.1 EP450 Non-Display Exploded View and Parts List
Figure 7-16.  EP450 Non-Display Radio Exploded View
1
2223 26
2
3
4
5
6
78
9
1011
12
13
14
15
16
1
7
18 19 20 2425
21
30 

7-14Mechanical View and Parts List
ItemMotorola
Part
NumberDescription
1See Section 6Antenna
2 3680530Z02 Knob, Frequency
31386440Z02Escutcheon, Top; 16 Ch.
4 5886627Z01 Antenna Adaptor / Seal
51586391Z01Housing, ELP+, Plain
6 3586621Z01 Felt, Speaker
73886489Z01PTT, Rubber
8 4586439Z01 PTT, Plastic
95085738Z08Speaker
10 4286620Z01 Retainer, Speaker
113586621Z02Felt, Microphone
12 0780608V01 Boot, Microphone
135085880L01Microphone
14 3286431Z02 Seal, Main O-ring
157586436Z01Pad, PA Interface
16...

Chapter 8 Troubleshooting Tables
8.1 Power-Up Error Codes
During radio power-up, the radio performs dynamic tests to determine if the radio is working properly. 
Problems detected during these tests are presented as an error code on the radio’s display. The 
presence of an error code should prompt a user that a problem exists and that a service technician 
should be contacted. Use Ta b l e  8 - 1 to aid in understanding particular operational error codes.
8.2 Operational Error Codes
During radio...

December 3, 2003HKLN4215A
8-2Troubleshooting Tables: Troubleshooting Table for Receiver
8.3 Troubleshooting Table for Receiver
Ta b l e  Ta b l e  8 - 3 lists the possible causes of, and corrections for, receiver problems.
Table 8-3.  Receiver Troubleshooting Table
Symptom Possible CausesCorrective or Test
(Measurements at Room Temperature)
Radio Dead; Display Does 
Not Turn On1. Dead Battery.Replace with charged battery.
2. Blown Fuse Send radio to depot.
3. On/Off Switch
4. Regulators
5. Regulator...

HKLN4215ADecember 3, 2003
Troubleshooting Tables: Troubleshooting Table for Transmitter 8-3
8.4 Troubleshooting Table for Transmitter
Table Table 8-4 lists the possible causes of, and corrections for, transmitter problems.
Table 8-4.  Transmitter Troubleshooting Table
Symptom Possible CausesCorrective or Test
(Measurements at Room Temperature)
No RF Power Out1. Tx Power Level or Fre-
quencyCheck Tx power level and frequency programming (from 
tuner).
2. No Injection To Power 
AmplifierSend radio to...