Intek MT-2020 User manual

Model No: INTEK
M
MT T
-
-2 20 02 20 0/ /4 40 04 40 0
PMR 8 Channel – LPD 69Channel
Service Manual
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Table of Contents
Pages
Specifications 3
Block Diagram 4
Schematic Diagram 5~6
Channel Frequency Charts 7~8
Printed Circuit Board 9~12
Test and Alignment Procedure 13~17
Parts List 18~37
Semiconductor Voltage Chart 38~40
Semiconductor Lead Assignment and Block Diagram 41~45
Exploded View and Parts List 46~49
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Title: MT2020/4040D SERVICE MANUAL
Rev. Date: January 5, 2005
SPECIFICATIONS
STANDARD TEST CONDITIONS
Supply Voltage - Battery 6.0Vdc
Antenna Impedance 50 Ohm
Audio Frequency 1 KHz
Main Signal Input 1mV
Deviation PMR AF 1 KHz / 1.5 KHz Dev
LPD AF 1 KHz / 3.0 KHz Dev
Audio Output Power ~1.8Vrms
Audio Output Impedance 8 ohms, non-inductive
Test Temperature 25 •
GENERAL SPECIFICATIONS
Transmitter CPU Controlled PLL Synthesizer
Receiver CPU Controlled double conversion, super-heterodyne
system
Intermediate Frequency 1st 21.4 MHz
2nd 450 KHz
Operating Frequencies PMR 446.00625MHz ~ 446.09375 MHz
LPD 433.07500 MHz ~ 433.77500 MHz
Frequency Stability 0.0005%
Battery Life 30 hours (typical)
Battery 4pcs AAA size Alkaline Battery or 4.8Vdc Ni-MH Battery
Pack
Transmitter/Receiver Switching Electrical
Ambient Conditions, Temperature / Humidity -15!c ~ 55!C / 40% ~ 70%
RECEIVER SPECIFICATIONS
Sensitivity <-120 @12dB SINAD
Audio Output ~2Vrms (w/o load)
Frequency Response 300 Hz ~ 2500 Hz
Image Rejection 54dB
Adjacent Channel Rejection 60dB
Inter Modulation Distortion 60dB
Conducted Rx Spurious -54dB
TRANSMITTER SPECIFICATIONS
Output Power(Conducted) PMR Band 500Mw (MT-2020) / 1W,500mW (MT-4040D)
LPD Band 10mW
Max. Deviation PMR "2.5 KHz(MAX)
LPD "5.0 KHz(MAX)
Frequency Error 5ppm(-15~+55!)
Current Drain <500 mA
Spurious Emission(Conducted) 50dB
Antenna Impedance 50 Ohm
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BLOCK DIAGRAM
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MT-2020D SCHEMATIC 
DIAGRAM
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MT-4040D SCHEMATIC 
DIAGRAM
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CHANNEL FREQUENCY CHARTS
PMR Frequency Chart
Channel Frequency (MHz) Channel Frequency (MHz)
1 446.00625Mhz 2 446.01875Mhz
3 446.03125Mhz 4 446.04375Mhz
5 446.05625Mhz 6 446.06875Mhz
7 446.08125Mhz 8 446.09375Mhz
CTCSS Tone Frequency Chart
NO FREQ.(Hz) NO FREQ. (Hz) NO FREQ. (Hz)
1 67.0 14 107.2 27 167.9
2 71.9 15 110.9 28 186.2
3 74.4 16 114.8 29 179.9
4 77.0 17 118.8 30 186.2
5 79.7 18 123.0 31 192.8
6 82.5 19 127.3 32 203.5
7 85.4 20 131.8 33 210.7
8 88.5 21 136.5 34 218.1
9 91.5 22 141.3 35 225.7
10 94.8 23 146.2 36 233.6
11 97.4 24 151.4 37 241.8
12 100.0 25 156.7 38 250.3
13 103.5 26 162.2
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LPD Frequency Chart
Channel Frequency (MHz) Channel Frequency (MHz)
01 433.07500 36 433.95000
02 433.1 0 00 0 37 4 33 . 97 5 00
03 43 3 .1 2 50 0 38 4 34 . 00 0 00
04 43 3 .1 5 00 0 39 4 34 . 02 5 00
05 43 3 .1 7 50 0 40 4 34 . 05 0 00
06 43 3 .2 0 00 0 41 4 34 . 07 5 00
07 43 3 .2 2 50 0 42 4 34 . 10 0 00
08 43 3 .2 5 00 0 43 4 34 . 12 5 00
09 43 3 .2 7 50 0 44 4 34 . 15 0 00
10 43 3 .3 0 00 0 45 4 34 . 17 5 00
11 43 3 .3 2 50 0 46 4 34 . 20 0 00
12 43 3 .3 5 00 0 47 4 34 . 22 5 00
13 43 3 .3 7 50 0 48 4 34 . 25 0 00
14 43 3 .4 0 00 0 49 4 34 . 27 5 00
15 43 3 .4 2 50 0 50 4 34 . 30 0 00
16 43 3 .4 5 00 0 51 4 34 . 32 5 00
17 43 3 .4 7 50 0 52 4 34 . 35 0 00
18 43 3 .5 0 00 0 53 4 34 . 37 5 00
19 43 3 .5 2 50 0 54 4 34 . 40 0 00
20 43 3 .5 5 00 0 55 4 34 . 42 5 00
21 43 3 .5 7 50 0 56 4 34 . 45 0 00
22 43 3 .6 0 00 0 57 4 34 . 47 5 00
23 43 3 .6 2 50 0 58 4 34 . 50 0 00
24 43 3 .6 5 00 0 59 4 34 . 52 5 00
25 43 3 .6 7 50 0 60 4 34 . 55 0 00
26 43 3 .7 0 00 0 61 4 34 . 57 5 00
27 43 3 .7 2 50 0 62 4 34 . 60 0 00
28 43 3 .7 5 00 0 63 4 34 . 62 5 00
29 43 3 .7 7 50 0 64 4 34 . 65 0 00
30 43 3 .8 0 00 0 65 4 34 . 67 5 00
31 43 3 .8 2 50 0 66 4 34 . 70 0 00
32 43 3 .8 5 00 0 67 4 34 . 72 5 00
33 43 3 .8 7 50 0 68 4 34 . 75 0 00
34 43 3 .9 0 00 0 69 4 34 . 77 5 00
35 43 3 .9 2 50 0
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MT-2020D TOP PCB MAP
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MT-2020D BOTTOM PCB MAP
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