Alinco djx2 Service Manual

DJ-X2E/DJ-X2T

Service Manual

CONTENTS

SPECIFICATIONS

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

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

CIRCUIT DESCRIPTION

1) Receiver ............................................................... 3~5

2) M38224M6M(E:XA0728, T:XA0729) ......................... 6

3) T erminal function of CPU .......................................... 7

SEMICONDUCTOR D ATA

1) NJM2070M (XA0210) ............................................... 8

2) uPD3140GS-E1 (XA0312) .................................... 8~9

3) TC4W53FU (XA0348) ............................................... 9

4) S-80730SL-AT (XA00356) ...................................... 10

5) M5222FP-600C (XA0385) ...................................... 10

6) XC62SPR332MR (XA0519) .................................... 11

7) NJM2904V (XA0573) .............................................. 11

8) MB88347LPFV-G-BND-EF (XA0599) ..................... 12

9) TK11816M (XA0665) .............................................. 13

10) TTK10931V (XA0666) ............................................ 13

11) TA4101FTE12L (XA0667) ....................................... 14

12) S-80829ALNP-EAS-T2 (XA0668) ........................... 14

13) BR24C64F-E2 (XA0669) ........................................ 15

14) uPC2757T-E3 (XA0743) ......................................... 16

15) Transistor, Diode, and LED Ontline Drawings.......... 17

16) LCD Connection ..................................................... 18

EXPLODED VIEW

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

2) Rear View ............................................................... 20

PARTS LIST

CPU Unit ................................................................ 21

MAIN Unit ......................................................... 21~25

ADJUSTMENT

1) Entering and releasing the adjustment mode.......... 26

2) Adjustment ....................................................... 26~27

PC BO ARD VIEW .................................................. 28~29

SCHEMATIC DIAGRAM ....................................... 30~31

BLOCK DIA GRAM...................................................... 32

ALINCO,INC.

SPECIFICATIONS

1) GENERAL

Receiving coverage E : 0.522 ~ 999.995MHz

T : 0.530 ~ 823.995MHz

850.000 ~ 868.995MHz

895.000 ~ 999.995MHz Wave type FM, WFM, AM Ant. impedance 50Ω Ant. terminal SMA Supply voltage DC 3.8V (Internal lithium-ion battery)

DC 4.5V (when using EDH-27) Ground Negative ground Current consumption Reception : approx. 80 mA

Battery save (1 : 4) : approx.25mA Temperature range -10 ~ +60°C (14 ~ 140°F) Frequency stability ±5 ppm (-10 ~ +60°C) (+14 ~ +140°F) Dimension 58 (W) × 90 (H) × 15 (D) mm (without projections)

(2.28(W) × 3.54(H) × 0.59(D) in.) Weight Approx. 85g (Lithium-ion battery inclusive)

(Approx. 3oz.)

2) RECEIVER

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

WFM -6dB/150kHz or over Selectivity FM/WFM 12dB SINAD, AM 10dB S/N typ. FM : 30 ~ 108 0.63uV (-4dBu)

136 ~ 222 0.40uV (-8dBu) 222 ~ 470 0.50uV (-6dBu) 470 ~ 770 0.56uV (-5dBu) 770 ~ 1000 0.71uV (-3dBu)

WFM : 76 ~ 108 3.20uV (10dBu)

175 ~ 222 2.20uV (7dBu) 470 ~ 770 3.20uV (10dBu)

AM : 0.5 ~ 1.62 7.10uV (17dBu)

1.62 ~ 30 1.40uV (3dBu) 108 ~ 136 2.00uV (6dBu) 222 ~ 330 1.80uV (5dBu)

CIRCUIT DESCRIPTION

1) Receiver

1. Receiver system : Triple Superheterodyne Conversion

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

2. Front End

0.5 ~ 29.995MHz

The signal from the antenna is switched by the band switch (D109), passed through the low-pass filter and amplified by RF amplifier Q109. Then the signal is fed to the 1st mix er IC103 via the band switch D115.

30 ~ 136.995MHz

The signal from the antenna is switched by the band switch (D128), passed through the low-pass filter and amplified by RF amplifier Q111. Then the signal is fed to the 1st mix er IC103 via the band switch D112.

137 ~ 222.995MHz

The signal from the antenna is switched by the band switch (D116), passed through the low-pass filter and amplified by RF amplifier Q116. Then the signal is fed to the 1st mix er IC103 via the band switches D107 and D129.

223 ~ 367.995MHz

368 ~ 469.995MHz

470 ~ 999.995MHz

3. Mixer

The 1st Mixer

The signal from the antenna is switched by the band switch (D132), passed through the low-pass filter and amplified by RF amplifier Q118. Then the signal is fed to the 1st mix er IC103 via the band switches D107 and D129.

The signal from the antenna is switched by the band switch (D122), passed through the low-pass filter and amplified by RF amplifiers Q123 and Q138. Then the signal is fed to the 1st mix er IC103 via the band switch D134.

The signal from the antenna is switched by the band switch (D133), passed through the low-pass filter and amplified by RF amplifier Q126. Then the signal is fed to the 1st mix er IC103 via the band switch D120.

The input signal and 1st local signal generate sum and difference frequencies in the mixer IC103. SAW filter FL101 selects the signal of 248.45MHz and eliminates the adjacent channel signals.

The 2nd Mixer

The input signal and the 2nd local signal generate sum and difference frequencies in the mixer IC104. Then the signals are divided into the receiving sides of FM/AM and WFM at D113 and D114.

FM/AM

WFM

4. IF

FM/AM

In the receiving side of FM/AM the signal of 38.85MHz is selected by crystal filter XF101. Then the signal is amplified at the 1st IF amplifier Q112 after eliminating the adjacent channel signal.

In the receiving side of WFM the signal of 38.85MHz is selected b y band-pass filter . Then the signal is amplified at the 1st IF amplifier Q112 after eliminating the adjacent channel signal.

The amplified signal at the 1st IF amplifier Q112 is led to the demodulator pin 24 of IC105. The signal of 12.8MHz from the ref erence b uff er output of IC101 is multiplied by 3 in Q133. Then the signal is mixed with the signal of pin 1 of IC105 in the mixer circuit inside of IC105 and conv erted into the 2nd IF signal of 450kHz. The con verted 2nd IF signal is output from pin 3 of IC105.

The output signal from pin 3 of IC105 is led to pin 7 of IC105 after eliminating the adjacent channel signal at the ceramic filter FL103. The input 2nd IF signal to pin 7 of IC105 is demodulated at the limiter amplifier and quadrature detector circuits inside of IC105, then output from pin 12 of IC105 as an AF signal.

WFM

5. Squelch

The output signal from pin 3 of IC105 is led to the pin 5 of IC105 after eliminating the adjacent channel signal at the ceramic filter FL103. The 2nd IF signal input to pin 5 of IC105 is AM-demodulated inside of IC and output from pin 13 of IC105 as an AF signal. The 1st IF amplifier Q112 is controlled by reverse AGC at A GC amplifier Q117 to get better audio output even though the input is changed, and the gain is controlled.

The output signal from pin 3 of IC105 is led to pin 7 of IC105. The input 2nd IF signal to pin 7 of IC105 is demodulated at the limiter amplifier and quadrature detector circuits inside of IC, then output from pin 12 of IC105 as an AF signal.

The AF signal got from pin 12 of IC105 is fed to pin 19 of IC105. The input signal is output from pin 21 of IC105 passing through the noise filter amplifier and rectifier circuits inside of IC. The rectified signal is added to the A/D port of the microcomputer IC1. Judging the signal, the microcomputer controls ON/OFF of the audio output.

6. Audio

FM/AM/WFM

7. VCO

The 1st Local

The 2nd Local

The selection of receiving audio output signal between FM/WFM and AM is performed at IC106. The volume of output audio signal is adjusted at the electronic volume IC108 via the AF amplifier Q120. After converting the impedance of the signal whose volume is adjusted at Q124, the signal is input to pin 2 of audio power amplifier IC110 and output from pin 6 to drive a speaker, etc.

The VCO for the 1st local consists of the Colpitts oscillator. D106, D108 and L105 determine the frequency, and they are oscillated at the transistor Q103. The oscillated signal is added to pin 2 of PLL-IC101 through the butter amplifiers Q105 and Q134.

The VCO for the 2nd local consists of the Colpitts oscillator. D110, D111 and L113 determine the frequency, and they are oscillated at the transistor Q110. The oscillated signal is added to pin 19 of PLL-IC101 through the butter amplifier Q135.

8. PLL

The 1st Local

The 2nd Local

PLL-IC101 is used to control the oscillation frequency of VCO. The microcomputer IC1 sends the signal with serial data to control IC101. The 12.8 MHz reference frequency of IC101 oscillates the crystal oscillator X101 at the inside circuit.

Using the control signal from IC1, IC101 compares the divided value of the added signal to pin 2 of IC101 with the divided value of 12.8 MHz reference frequency inside IC101. When the phase difference is occurred, IC101 outputs the pulse signal from pin 8 and conv erts into DC voltage at the active filter Q107 and Q108. Then it is fed to the cathode of the VCO vari-cap diodes of D106 and D108 to reduce the phase difference . This brings the stable oscillation at the desired frequency.

Using the control signal from IC1, IC101 compares the divided value of the added signal to pin 19 of IC101 with the divided value of 12.8 MHz reference frequency inside IC101. When the phase difference is occurred, IC101 outputs the pulse signal from the charge pump output pin 13 and converts into DC voltage at the inside circuit for the activ e filter . Then it is f ed to the cathode of the VCO vari-cap diodes of D110 and D111 to reduce the phase difference. This brings the stable oscillation at the desired frequency.

2) M38224M6M (E:XA0728, T:XA0729)

CPU Terminal Connection

(TOP VIEW)

3) Terminal function of CPU

No. Terminal Signal I/O Description No. Terminal Signal I/O Description

1 AN7 BP NC 41 P15 P1C O PLL 1ch SW 2 AN6 BATT I Battery input 42 P14 DBC O Doubler SW 3 P65 PCNT 0 43 P13 ASW O Whip antenna SW 4 AN4 SMT I S-meter input 44 SEG26 SEG26 O 5 AN3 SQL I Squelch input 45 SEG25 SEG25 O 6 P62 AFPC O AF power supply 46 SEG24 SEG24 O 7 P61 BND3 O Band3 SW 47 SEG23 SEG23 O 8 P60 BND2 O Band2 SW 48 SEG22 SEG22 O

9 P57 RC O RX SW 49 P05 SCT O Secret SW 10 P56 BND4 O Band4 SW 50 SEG20 SEG20 O 11 P55 BND5 O Band5 SW 51 SEG19 SEG19 O 12 P54 BND1 O Band1 SW 52 P02 EAR O Earphone antenna SW 13 P53 DATA/UL I/O Data/Unlock 53 SEG17 SEG17 O 14 P52 STB2 O DAC strobe 54 SEG16 SEG16 O 15 P51 CLK O Clock 55 SEG15 SEG15 O 16 P50 STB1 O PLL strobe 56 SEG14 SEG14 O 17 P47 ATT O ATT SW 57 SEG13 SEG13 O 18 P46 P2C O PLL 2ch SW 58 SEG12 SEG12 O 19 TXD CTX O Clone TX 59 SEG11 SEG11 O 20 RXD CRX I Clone RX 60 SEG10 SEG10 O 21 P43 BEEP O Beep output 61 SEG9 SEG9 O 22 INT0 BU I Backup interrupt 62 SEG8 SEG8 O 23 P41 UP I Key input 63 SEG7 SEG7 O 24 P40 DOWN I Key input 64 SEG6 SEG6 O 25 RESET RESET I Reset interrupt 65 SEG5 SEG5 O 26 P71 SDA I/O EEPROM data 66 SEG4 SEG4 O 27 P70 SCK O EEPROM clock 67 SEG3 SEG3 O 28 XIN XIN I Clock input 68 SEG2 SEG2 O 29 XOUT XOUT O Clock output 69 SEG1 SEG1 O 30 VSS GND 70 SEG0 SEG0 O 31 P27 KEY8 I Key input 71 VCC VDD 32 P26 KEY7 I Key input 72 VREF VDD 33 P25 KEY6 I Key input 73 AVSS GND 34 P24 KEY5 I Key input 74 COM3 COM3 O 35 P23 KEY4 I Key input 75 COM2 COM2 O 36 P22 KEY3 I Key input 76 COM1 COM1 O 37 P21 KEY2 I Key input 77 COM0 COM0 O 38 P20 KEY1 I Key input 78 VL3 VL3 I 39 P17 BND6 O Band6 SW 79 VL2 VL2 I 40 P16 PLLC O PLL power supply 80 VL1 VL1 I