Pozosta DJ-X3 User Manual

DJ-X3

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Amateur Radio Directory

Service Manual

CONTENTS

SPECIFICATIONS

1) GENERAL ................................................................ 2

2) RECEIVER ............................................................... 2

CIRCUIT DESCRIPTION

1) Receiver ............................................................... 3~6

2) M38224M6M(E:XA0862, T:XA0836) ......................... 7

3) T erminal function of CPU .......................................... 8

SEMICONDUCTOR D ATA

1) uPD3140GS-E1 (XA0312) ........................................ 9

2) TC4W53FU (XA0348) ............................................. 10

3) NJM2904V (XA0573) .............................................. 10

4) CXA1622M/P (XA0787) .......................................... 10

5) MB88347LPFV-G-BND-EF (XA0599) ..................... 11

6) TK11816M (XA0665) .............................................. 12

7) TK10931V (XA0666)............................................... 12

8) T A4101FTE12L (XA0667)....................................... 13

9) S-80828ALNP-EAR-T2 (XA0834) ........................... 13

10) BR24C64F-E2 (XA0669) ........................................ 14

11) S-81230SG-QB-X (XA0833) ................................... 14

12) uPC2757T-E3 (XA0743) ......................................... 15

13) TC7SET08FU (XA0586) ......................................... 15

14) LA3335M (XA0786) ................................................ 16

15) NJM2107 (XA0850) ................................................ 17

16) Transistor, Diode and LED Outline Drawings...........17

17) LCD Connection ..................................................... 18

EXPLODED VIEW

1) Front View............................................................... 19

2) Bottom View............................................................ 20

PARTS LIST

MAIN Unit ......................................................... 21~26

SW Unit .................................................................. 26

Mechanical Parts .................................................... 26

Packing................................................................... 26

ADJUSTMENT

1) How to enter the adjustment mode ......................... 27

2) Adjustment ....................................................... 27~29

PC BO ARD VIEW .................................................. 30~31

SCHEMATIC DIAGRAM ............................................. 32

BLOCK DIA GRAM...................................................... 33

ALINCO,INC.

SPECIFICATIONS

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Amateur Radio Directory

1) GENERAL

Receiving range E : 0.1 ~ 1299.995 MHz

T : 0.1 ~ 823.995 MHz

850.000 ~ 868.995 MHz

895.000 ~ 1299.995 MHz
Modulation mode FM, WFM, AM
Ant. impedance 50Ω
Ant. ter minal SMA
Supply voltage DC 3.6V ~ 6V (Internal battery)

DC 4.5V ~ 16V (external regulated source)
Ground Negative ground
Current consumption reception : approx.75mA

Battery save (1:4)approx.39mA
Temperature range -10 ~ +60°C (+14 ~ +140 F°)
Frequency stability ±5ppm(-10 ~ +60°C)(+14 ~ +140F°)
Dimension 56(W) × 102(H) × 23(D)mm
Weight Approx.145g

2) RECEIVER

System Triple-conversion superheterodyne
First IF 248.45 MHz
Second IF 38.85 MHz
Third IF 450 kHz
Selectivity AM/FM -6dB/12kHz or over , -60dB/30kHz or less

WFM -6dB/150kHz or over
Sensitivity FM/WFM 12dB SINAD, AM 10dB S/N
Typ. AM : 0.5 ~ 1.62MHz 17dBu 10dB S/N

1.625MHz or over 5dBu 10dB S/N

FM : 30 ~ 550MHz -3dBu 12dB SINAD

550MHz or over 0dBu 12dB SINAD

WFM : 76 ~ 770MHz 13dBu 12dB SINAD
Audio output power more than 220mW (8Ω)

2

CIRCUIT DESCRIPTION

1) Receiver

1. RX Method: Triple Super Heterodyne Method

1st IF. : 248.45MHz
2nd IF. : 38.85MHz
3rd IF. : 450KHz

2. Front End

0.1 ~ 29.995MHz

The signal input from antenna is switched at band s witch D19, passing through
the low pass filter , it is amplified at RF amplifier Q15. Then the signal is added
to the 1st mixer IC3 through the band s witch D17.

30 ~ 136.995MHz

The signal input from antenna is switched at band s witch D23, passing through
the band pass filter, it is amplified at RF amplifier Q21. Then the signal is added
to the 1st mixer IC3 through the band s witch D22.

137 ~ 222.995MHz

The signal input from antenna is switched at band s witch D27, passing through
the band pass filter, it is amplified at RF amplifier Q23. Then the signal is added
to the 1st mixer IC3 through the band s witch D26.

223 ~ 367.995MHz

368 ~ 469.995MHz

470 ~ 129.995 MHz

3. Mixer

The 1st Mixer

The signal input from antenna is switched at band s witch D29, passing through
the band pass filter, it is amplified at RF amplifier Q27. Then the signal is added
to the 1st mixer IC3 through the band s witch D28.

The signal input from antenna is switched at band s witch D32, passing through
the band pass filter, it is amplified at RF amplifier Q32. Then the signal is added
to the 1st mixer IC3 through the band s witch D31.

The signal input from antenna is switched at band switch D37 and D45,
passing through the band pass filter , it is amplified at RF amplifier Q38. Then
the signal is added to the 1st mixer IC3 through the band s witch D36.

The input signal and the 1st local signal is added or subtracted at mixer IC3,
and SAW filter FL1 selects the signal of 248.45 MHz, then eliminates the
adjacent signal.

3

The 2nd Mixer

FM/AM

WFM

4. IF

FM/AM

The input signal and the 2nd local signal is added or subtracted at mixer IC4,
and switched to FM/AM receiving side or WFM receiving side at D24 or D25 .

At FM/AM receiving side, the crystal filter XF1 selects the signal of 38.85 MHz.
The signal is amplified at the 1st IF amplifier Q22 after the adjacent signal is
eliminated.

At WFM receiving side, the band pass filter selects the signal of 38.85 MHz.
The signal is amplified at the 1st IF amplifier Q22 after the adjacent signal is
eliminated.

The amplified signal at the 1st IF amplifier Q22 is supplied to pin 24 of IC6 for
demodulation. The signal of 12.8 MHz from the IC 1 reference buffer output is
multiplied by 3 at Q17, then mix ed with the signal added to pin 1 of IC6 in the
mixer circuit inside IC6 to be con verted into the 2nd IF signal of 450 kHz. The
converted 2nd IF signal is output from pin 3 of IC6.

FM

AM

WFM

5. Squelch

The output signal from pin 3 of IC6 is input to pin 7 of IC6 after the adjacent
signal is eliminated at the ceramic filter FL2. The 2nd IF signal input to pin 7 of
IC6 is demodulated at the limiter amplifier and quadrature detection circuit
inside IC. Then the signal is output from pin 12 of IC6 as an AF signall.

The output signal from pin 3 of IC6 is input to pin 5 of IC6 after the adjacent
signal is eliminated at the ceramic filter FL2. The 2nd IF signal input to pin 5 of
IC6 is output from pin 13 of IC6 as an AF signal after AM is detected inside IC.
Also reverse AGC is added to the 1st IF amplifier Q22 by AGC amplifier Q25
and the gain is controlled to get the normal audio output even though the input
signal is fluctuated.

The output signal from pin 3 of IC6 is input to pin 7 of IC6. The 2nd IF signal
input to pin 7 of IC6 is demodulated at the limiter amplifier and quadrature
detection circuit inside IC, and output from pin 12 of IC6 as an AF signal.

The AF signal is output from pin 12 of IC6 and input to pin 19 of IC6. The
input signal is output from pin 21 of IC6 through the noise filter amplifier
and rectifying circuit. The rectified signal is supplied to the A/D por t of
microcomputer IC1. Then the microcomputer IC1 judges the signal to
control ON/OFF of audio output.

4

6. Audio

FM/AM/WFM

7. VCO

The 1st Local

The audio output signal for receiving FM/WFM and AM is s witched at IC9. The
output audio signal is input to pin 1 of IC13 of stereo multiplex demodulator
through AF amplifier IC17. When the input audio signal doesn't have a pilot
signal, each audio signal is output from pin 9 and pin 10 to pin 1 and pin 16 of
the audio amplifier IC14 equipped with the electronic volume . After the volume
is adjusted, the signal is output from pin 7 and pin 10 to drive the speaker , etc.
When the input signal has a pilot signal, each audio signal is output; L side
signal is output from pin 9, and R side signal is output from pin 10.
Then the signals are input to the audio amplifier IC 14 equipped with electronic
volume; L side signal is input to pin 1 and R side signal is input to pin 16. After
adjusting the volume the signals are output; the L side from pin 7 and the R side
from pin 10 to drive the speaker, etc.

VCO for the 1st local consists of the Colpitts oscillator. D15, D16 and L4
determine the frequency, and the signal is oscillated at the transistor Q9. The
oscillated signal is supplied to pin 2 of PLL-IC1 passing through the buffer
amplifier Q11 and Q10.

The 2nd Local

8. PLL

The 1st Local

VCO for the 2nd local consists of the Colpitts oscillator. D20, D21 and L15
determine the frequency , and the signal is oscillated at the transistor Q19. The
oscillated signal is supplied to pin 19 of PLL-IC1 passing through the buffer
amplifier Q20.

PLL-IC1 is used to control the oscillating frequency of VCO . IC1 is controlled b y
the serial control signal sent from the microprocessor IC7. The ref erence frequency
of 12.8 MHz is generated by oscillating the crystal oscillator X1 inside
the circuit.

IC1 compares the frequency gained by dividing the signal added to pin 2 of IC1
by the control signal from IC7 with the frequency gained by dividing the
reference frequency of 12.8 MHz inside IC1. When the phase difference is
found as a result of phase comparison, the pulse signal is output from the
charge pump output of pin 8 of IC1, then the signal is conv erted into the DC
voltage at the activ e filter Q13 and Q14 and added to the cathode side of VCO

5

The 2nd Local

vari-cap D15 and D16 to make the phases equal. In result the stabilized
oscillation can be done at the desired frequency.

IC1 compares the frequency gained by dividing the signal added to pin 19 of
IC1 by the control signal from IC7 with the frequency gained by dividing the
reference frequency of 12.8 MHz inside IC1. When the phase difference is
found as a result of phase comparison, the pulse signal is output from the
charge pump output of pin 13 of IC1, then the signal is converted into the DC
voltage at the inside circuit for active filter and added to the cathode side of
VCO vari-cap D20 and D21 to make the phases equal. In result the stabilized
oscillation can be done at the desired frequency.

6

2) M38224M6M (E:XA0862, T:XA0836)

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Amateur Radio Directory

CPU
Terminal Connection

(TOP VIEW)

7

3) Terminal function of CPU

No. Terminal Signal I/O Description

1 AN7 BAT AD Battery input
2 P66 S/M O Stereo / Monophonic
3 P65 RESW I R/E push key
4 AN4 SQL AD Squelch input
5 AN3 SMT AD S-meter input
6 P62 AFPC O AF power supply
7 P61 BND3 O Band3 SW
8 P60 BND6 O Band6 SW

9 P57 BND2 O Band2 SW
10 P56 BND4 O Band4 SW
11 P55 BND5 O Band5 SW
12 P54 BND1 O Band1 SW
13 P53 ABAR O Antenna SW
14 P52 SBAR O Antenna SW
15 INT3 RE2 I Rotary encoder input
16 P50 RE1 I Rotary encoder input
17 P47 RC O RX SW
18 P46 ASW O Antenna SW
19 TXD CTX O Clone TX
20 RXD CRX I Clone RX
21 P43/INT1 PSW I Power key
22 INT0 BU I Backup interrupt
23 P41 BEEP O Beep output
24 P40 JKDT I Jack state input
25 RESET RST I Reset interrupt
26 P71 SCK O EEPROM clock
27 P70 SDA I/O EEPROM data
28 XIN XIN I Clock input
29 XOUT XOUT O Clock output
30 VSS VSS GND
31 P27 SW2 I Key input
32 P26 SW3 I Key input
33 P25 SW4 I Key input
34 P24 SW301 I Key input
35 P23 SW302 I Key input
36 P22
37 P21 STB2 O DAC strobe
38 P20 DATA I/O Data / Unlock
39 SEG22 SEG22
40 SEG21 SEG21

CLNSW

O Clone SW

No Terminal Signal I/O Description

41 SEG20 SEG20
42 SEG19 SEG19
43 SEG18 SEG18
44 P12 DBC O Doubler SW
45 P11 C3C O Common power SW
46 P10 SCT O Secret signal output
47 P07 AFS O AF SW
48 P06 CLK O Clock
49 P05 STB1 O PLL strobe
50 P04 PLLC O PLL power supply
51 P03 P1C O PLL 1ch SW
52 P02 P2C O PLL 2ch SW
53 SEG17 SEG17
54 SEG16 SEG16
55 SEG15 SEG15
56 SEG14 SEG14
57 SEG13 SEG13
58 SEG12 SEG12
59 SEG11 SEG11
60 SEG10 SEG10
61 SEG9 SEG9
62 SEG8 SEG8
63 SEG7 SEG7
64 SEG6 SEG6
65 SEG5 SEG5
66 SEG4 SEG4
67 SEG3 SEG3
68 SEG2 SEG2
69 SEG1 SEG1
70 SEG0 SEG0
71 VCC VDD
72 VREF VDD
73 AVSS GND
74 COM3 COM3
75 COM2 COM2
76 COM1 COM1
77 COM0 COM0
78 VL3 VL3
79 VL2 VL2
80 VL1 VL1

8

SEMICONDUCTOR DATA

1) uPD3140GS-E1 (XA0312)

80 ~ 550MHz Dual PLL Synthesizer
Specifications

Operating frequency: 200 ~ 400MHz (Vin=-12 ~ -0dBm, pin 2 and 19 input)

80 ~ 550MHz (Vin=-8 ~ -0dBm, pin 2 and 19 input)

Consumption current: 2.7 ~ 4.1mA (Vcc=1.8V while 1 channel is used)

4.3 ~ 6.6mA (Vcc=1.8V while both channels are used)
0 ~ 10uA (Vcc=1.8V in power save mode)

3.5 ~ 5.3mA (Vcc=5V while 1 channel is used)

5.6 ~ 8.6mA (Vcc=5V while both channels are used)

Operationg voltage: 1.8 ~ 5.5V

9

2) TC4W53FU (XA0348)

3) NJM2904V (XA0573)

Dual Single Supply Operational Amplifer

4) CXA1622M/P (XA0787)

Pin Assignment

IN2
SW 2

NC
NF2 4
GND

P GND2

OUT2

RIPPLE 8

1

3

5
6
7

16
15
14
13
12
11
10

9

IN1
REG
VOL
NF1
GND
P GND1
OUT1

Vcc

Block Diagram

16 15 14 13

1

REG VOL

2

12 11

PRE+POWER1

PRE+POWER2

4

3

567

9

10

8

10

5) MB88347LPFV-G-BND-EF (XA0599)

D/A converter for digital tuning

11