Motorola Portable Radio Ep450 Basic Hkln4215a Manual

December 3, 2003HKLN4215A
5-12Radio Alignment Procedures: Receiver Tuning
5.5.2 Squelch Tuning
5.5.2.1  Manual Squelch Tuning
Perform the squelch tuning procedure as follows:
1.Under the Rx Align menu, select Squelch Attenuation. Select Squelch Attenuation 12.5 kHz 
or Squelch Attenuation 25 kHz Channel Spacing variations (Figure 5-10). 
2.Apply an RF signal modulated with a 1 kHz tone at 60% rated deviation listed in Table 5-5 for cur-
rent frequency point (F1 being the first) of 10 dB SINAD. That is,...

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Receiver Tuning 5-13
3.Set softpot to its maximum value to mute the radio.
4.Adjust the softpot value by using the slider, keying in the edit box or using the spin controls. Press 
ENTER to confirm the selection or use the spin controls. Do this until the radio is totally unmuted. 
Verify the squelch closing by inputting a signal level of 4 dB lower than that of the 10 dB SINAD 
level.
5.Repeat Steps 2 through 4 of Manual Squelch Tuning, for frequency...

December 3, 2003HKLN4215A
5-14Radio Alignment Procedures: Utilities
5.Adjust the input level to reflect the next soft spot value. Repeat steps 3 and 4 to tune the next 
value.
5.5.4 RSSI Display Tuning
1.Under the Rx Align menu, select RSSI Display Tuning.
2.Inject an on channel signal to the radio at -47 dBm at the frequency listed. Modulated the signal 
with a 1 kHz tone at 60% deviation (3 kHz) to verify the radio is receiving the desired frequency. 
RSSI tuning is only done at 25 kHz channel...

HKLN4215ADecember 3, 2003
Radio Alignment Procedures: Radio-to-Radio Cloning 5-15
Procedure:
1.Turn source and target radios off.
2.Connect cloning cable (AAPMKN4003) to the side connector of both radios.
3.Turn on the destination radio.
4.Press and hold the two side buttons at the same time on the source radio and then power up the 
source radio (Figure 5-12). Both radios produce a “clone-entry” tone.
5.Release both side buttons, 1 and 2.
6.When cloning is completed, the source radio produce’s a...

December 3, 2003HKLN4215A
Notes:
5-16Radio Alignment Procedures: Radio-to-Radio Cloning 

Chapter 6 Display Model Disassembly and
Re-assembly
6.1 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
6.2 Preventive Maintenance
The radios do not require a scheduled preventive maintenance program; however, yearly verification 
of technical parameters and periodic visual inspection and cleaning is recommended.
6.2.1...

December 3, 2003HKLN4215A
6-2Display 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...

HKLN4215ADecember 3, 2003
Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 6-3
6.4 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 3.2 for a list of service aids):
 Knob...

December 3, 2003HKLN4215A
6-4Display 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 6-2.)
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 6-3). 
Press the...

HKLN4215ADecember 3, 2003
Display Model Disassembly and Re-assembly: Disassembling and Re-assembling the Radio — General 6-5
7.Rotate the bottom of the chassis up about 20° to disconnect the keyboard flex cable connector. 
Push down 2 end tabs to release flex connector at the bottom of the chassis.
8.Rotate the chassis counterclockwise out of the housing and position next to the housing. Take 
care not to damage the speaker and microphone wires that are still connected to the chassis 
(Figure 6-5)....