Alinco Dr-m03sx, Dr-m06th Service Manual

DR-M03SXService Manual
DR-M06TH
CONTENTS
SPECIFICATIONS PARTS LAST
1) General 2 CPU Unit 22
2) Transmitter 2 MAIN Unit 22~24
3) Receiver 2 VCO Unit 24
CIRCUIT DESCRIPTION SP Unit 25
1) Receiver System 3 Mechanical Parts 25
2) Transmitter System 4 Packing.. 25
3) PLL Circuit 4 DRM03 PA Unit 25
4) Terminal Function of Microprocessor 5 ~ 7
5) Terminal Connection of Microprocessor 8 ADJUSTMENT
 SEMICONDUCTOR DATA   1) Required Test Equipment. 27
1) AK2341 9   2) Adjustment for DR-M06/03 28~29
2) AN78L05M 10...

* SPECIFICATIONS
GENERAL
Frequency DRM03SX 28.00 - 29.700MHz
DRM06TH 50.00 - 54.00MHz
Step 5 , 10 , 12.5 , 15 , 20 , 25 KHz selectable
Channel 100
Modulation F3E (FM)
Antenna impedance 50 ohm unbalanced
Power supply 13.8V DC +/- 10%
Current Tx high.approxl 3.0
A(DRM03SX)
Rx squelched.less than 600mA
Dimensions DRM03SX 140(W) x 40(H) x 115(D)
DRM06TH 140(W) x 40(H) x 155(D)
Weight DRM03SX approx 681gs
DRM06TH approx 800gs
Transmitter
Power output DRM03SX High : 10W    Low: 1W
DRM06TH High : 20W    Low:...

CIRCUIT DESCRTPTION
1) Receiver System
1. Front End The signal from the antenna is passed through a low-pass filter and input to
the voltage step up circuit consisting Of L14. The signal from L14 is led to
the gate of Q1. D19 is the diode limiter circuit against the excessive input
power of more than 20dBm. Q1 is the FETwhich has two gates. The
voltage of the gate 2 is set higher to get the high gain and sensitivity. The
signal from Q1 is led to the triple band pass filter (L4, L5, L6), and gets the
high...

2) Transmitter System
 1. Modulation Circuit
The microphone amplifier IC1 (IDC, LPF) consists of two operational amplifi-
ers. The signal from the microphone is led to pre-emphasis circuit consisting
of C36 and R47 and then to the limiter circuit. The limiter circuit uses the
saturation of the OP amplifier. The amplified signal is input to the low-pass
filter IC1A. The output signal from the microphone amplifier is passed
through variable resistors VR2 for modulatlon adjustment and input to the
VCO unit....

4) Terminal Function of Microprocessor
Port No. I/O Logic PinName Description
1 O SEG19 LCDSegment19 Output
2 O SEG20 LCDSegment20 Output
3 O SEG21 LCDSegment21 Output
4 O SEG22 LCDSegment22 Output
5 O SEG23 LCDSegment23 Output
6 I GND AnalogGround 0V
7 I Vref Reference Voltage Input 5V
8 I Vcc CPU Power Supply hnput 5V
9 O 1750_ ToneBurstOutput
10 O Clock BEEP BeepToneOutput
11 I Active Low MUP Channel Up Input (Microphone Control)
12 I Active Low MDN Channel Down Input (Microphone Control)
13 I NoUse...

Port No. I/O Logic PinName Description
40 I/O Clock SDA Data Output for EEPROM
41 O Clock CLK Clock Output
42 O Clock DAT DataOutput
43 O Clock ST1 Strobe Output for PLL IC
44 O Clock ST2 Strobe Output for CTCSS IC
45 I Active Low SFT Shift Key Input
46 I Active High SD Signal Detection Input
47 O Active High H/L Transmission Power (H: Low Power)
48 I Active Low V/M VFO/Memory Key Input
49 I Active Low CAL Call Key Input
50 I Active Low CTC CTCSS Mode Set Input
51 I Active Low REV Reverse Key Input
52 I...