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ADJUSTMENT PROCEDURE
Step Adjustment
Test Point Procedure
1
L18 Receive
*1
TP1
1. Connect digital voltmeter to TP1 on RF PCB.
2. Set CH01 .
3. Adjust L18.
4. TP1 voltage 1.2~1.6V DC.
2
L20 Transmit
*1
TP1
1. Connect a digital voltmeter to TP1 on RF PCB.
2. Set CH01 .
3. Adjust L20.
4. TP1 voltage 1.2~1.6V DC.
3
VC1
*2
1. Connect the antenna coupler output to a frequency counter.
2. Set channel to CH01 (156.050 MHz).
3. Adjust VC1 to obtain a frequency reading 156.050 MHz
±
200Hz.
4
VR2
Modulation
*2
1. Connect the antenna coupler output to an FM linear detector.
2. Connect Audio Oscillator to Microphone Jack.
3. Set unit to transmit mode.
4. Set audio oscillator output to -23dBm 1 kHz.
5. Adjust VR2 to obtain
±
4.5 kHz deviation.
Remark:
*1: Please reference the “Main PCB Bottom View” drawing in page
13.
*2: Please reference the “Main PCB Top View” drawing in page
12.
10
Summary of Contents for MR HH475 FLT BT
Page 11: ...WIRING DIAGRAM 11 ...
Page 12: ...PRINTED CIRCUIT BOARD Main PCB Top View VR2 VC1 12 ...
Page 13: ...PRINTED CIRCUIT BOARD Main PCB Bottom View L18 L20 13 ...
Page 14: ...PRINTED CIRCUIT BOARD Cradle Charger PCB View Top View Bottom View 14 ...
Page 16: ...EXPLODED VIEW for HH475 Main Part 16 ...
Page 17: ...EXPLODED VIEW for Battery and Antenna 17 ...
Page 54: ...U4 U5 324 NJM V 54 ...
Page 60: ...U401 HT1621 DICE 60 ...