djc7TE_SM.pdf

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1、 DJ C7 T / E Service Manual CONTENTS S SPECIFICATIONS General. Transmitter. Receiver. CIRCUIT DISCRIPTION 1) Receiver System. 2) Transmitter System. 3) M38268MCL069GP (XA1023). SEMICONDUCTOR DATA 1) NJM2070M (XA0210) 2) TC4W53FU (XA0348) . 3) XC62HR3302MR (XA0519). 4) BA4510FV (XA0537). 5) NJM2904V

2、(XA0573). 6) TK10931V (XA0666). 7) BU9831F (XA0882) 8) uPC2771TB (XA0953) 9) uPC2757TB (XA0976). 10) BR24L32FV (XA1008). 11) BD4930FVE (XA1009). 12) MB15A01PFV1 (XA1010). 13) XC6383A701MR (XA1012). 14) MM1438BW (XA1013). 15) TC75S51FU (XA1014). 16) Transistor, Diode and LED Outline Drawing. 17) LCD

3、Connection (A48A002X). EXPLODED VIEW 1) Front View. 2) Rear View. 2 2 2 3-5 6 7-9 10 10 10 10 11 11 11 12 12 12 12 13 13 14 14 15 16 17 18 PARTS LIST MAIN Unit. KEY Unit. BATTERY Unit. PTT Unit. ROTARY ENCODER Unit. Mechanical Parts. Packing Parts ADJUSTMENT 1) Required Test Equipment. 2) Entering a

4、nd Releasing the Adjustment Mode. PC BOARD VIEW. SCHEMATIC DIAGRAM. BLOCK DIAGRAM. 19-22 22-23 23 23 23 23 23 24 25-28 29-33 34-35 36 ALINCO, INC. 2 SPECIFICATIONS General Type DJ C7T DJ-C7E VHF 144.000 147.995MHz 144.000 145.995MHz Transmitter Range UHF 420.000 449.995MHz 430.000 439.995MHz WFM 88.

5、100 1.7.995MHz 87.500 107.995MHz VHF 108.000 173.995MHz 144.000 145.995MHz Receiving Range UHF 380.000 511.995MHz 430.000 439.995MHz Modulation F3E Operating temperature -10 C 60C (+14F +140F) Frequency stability -7 +3 ppm Antenna impedance 50ohm unbalanced (SMA) Supply Voltage 3.7 6.0VDC (External)

6、 Ground method Negative ground DC6.0V: VHF Approx. 0.28A, UHF Approx. 0.32A Transmit 3.7V(EBP-58N): VHF Approx. 0.25A, UHF Approx. 0.30A Receive Approx. 70mA Current drain Battery Save Approx. 19mA Dimensions (Projection exclusive) 58 (w) x 96 (h) x 14.5 (d) mm Weight Approx. 102g (EBP-58N inclusive

7、) Transmitter Type DJ-C7T DJ-C7E DC6.0V Approx. 0.5W Output power EBP-58N equipped Approx. 0.3W Modulation System Variable reactance frequency modulation Maximum Frequency Deviation +/- 5kHz Spurious Emission - 60 dB c or less Microphone impedance Approx. 2kohm Receiver Type DJ-C7T DJ-C7E Receiver c

8、ircuit Double conversion super-heterodyne 1st 50.85MHz (FM/AM), 10.7MHz (WFM) Intermediate frequency 2nd 450MHz (FM/AM) Sensitivity (12dB SINAD) 144.000 147.995MHz 420.000 449.995MHz -15dBu or less 144.000 145.995MHz 430.000 439.995MHz -15dBu or less Audio output power 100mW or more (Max) / 90mW or

9、more (8ohm, 10 % THD) Spurious response 60 dB or less Squelch sensitivity Approx. - 18 dBu or less ! NOTE: All specifications are subject to change without notice or obligation. 3 CIRCUIT DESCRIPTION 1) Reception 1. RX Method FM/AM Double Super Heterodyne Method 1st IF: 50.85MHz 2nd IF: 450kHz WFM S

10、ingle Super Heterodyne Method 1st IF: 10.7MHz 2. Front End WFM BAND The signal input from antenna passes through the low pass filter, and then it is amplified at RF amplifier Q13. The amplified signal is led to band pass filter and band switch D17, then input to the mixer IC3. VHF BAND The signal in

11、put from antenna passes through the low pass filter, and then it is amplified at RF amplifier Q18. The amplified signal is led to band pass filter and band switch D17, then input to the mixer IC3. UHF BAND The signal input from antenna passes through the band pass filter, and then it is amplified at

12、 RF amplifier Q21. The amplified signal is led to band pass filter and band switch D29, then input to the mixer IC3. 3. Mixer FM/AM The input signal to the mixer IC3 and the 1st local signal are added or subtracted at mixer IC3, and the crystal filter FL1 selects the signal of 50.85 MHz, then it is

13、amplified at the 1st IF amplifier Q15 after the adjacent signal is eliminated. WFM The input signal to the mixer IC3 and the 1st local signal are added or subtracted at mixer IC3, and the ceramic filter FL2 selects the signal of 10.7MHz, then it is amplified at the 1st IF amplifier Q14 after the adj

14、acent signal is eliminated. 4 4. IF FM/AM The signal amplified at the 1st IF amplifier Q15 is supplied to pin 24 of IC7 for demodulation. Also the signal of 12.6 MHz from the reference buffer output of IC2 is multiplied by 3 at Q12, and then it is led to pin 1 of IC7. 2 input signals are mixed in th

15、e mixer circuit inside IC7 and converted into the 2nd IF signal of 450kHz.The converted 2nd IF signal is output from pin 3 of IC7. FM The output signal from pin 3 of IC7 is led to pin 7 of IC7 after eliminating the adjacent channel signal at the ceramic filter FL3. The input 2nd IF signal to pin 7 o

16、f IC7 is demodulated at the limiter amplifier and quadrature detector circuits inside of IC7, then output from pin 12 of IC7 as an AF signal. AM The output signal from pin 3 of IC7 is led to the pin 5 of IC7 after eliminating the adjacent channel signal at the ceramic filter FL3. The 2nd IF signal i

17、nput to pin 5 of IC7 is AM-demodulated inside of IC and output from pin 13 of IC7 as an AF signal. The 1st IF amplifier Q15 is controlled by reverse AGC at AGC amplifier Q19 to get better audio output even though the input is changed, and the gain is controlled. WFM The signal amplified at the 1st I

18、F amplifier Q14 is supplied to pin 7 of IC7 for demodulation. The input 2nd IF signal to pin 7 of IC7 is demodulated at the limiter amplifier and quadrature detector circuits inside of IC7, then output from pin 12 of IC7 as an AF signal. 5. Squelch The AF signal got from pin 12 of IC7 is fed to pin

19、19 of IC7. The input signal is output from pin 21 of IC7 passing through the noise filter amplifier and rectifier circuits inside of IC7. The rectified signal is added to the A/D port of the microcomputer IC6. Judging the signal, the microcomputer controls ON/OFF of the audio output. 6. Audio FM/AM/

20、WFM The selection of receiving audio output signal between FM/WFM and AM is performed at IC8. The volume of output audio signal is adjusted at the electronic volume IC14 via the AF amplifier Q27. The signal is input to pin 2 of audio power amplifier IC12 and output from pin 6 to drive a speaker, etc

21、. 5 7. VCO VHF VCO in VHF band consists of the Colpitts oscillator. D3, D4 and L11 determine the oscillating frequency, and the signal is oscillated at the transistor Q2. The oscillated signal is supplied to pin 8 of PLL-IC2 passing through the buffer amplifier Q5 and Q4. UHF VCO in UHF band consist

22、s of the Colpitts oscillator. D9, D11 and L18 determine the oscillating frequency, and the signal is oscillated at the transistor Q7. The oscillated signal is supplied to pin 8 of PLL-IC2 passing through the buffer amplifier Q5 and Q4. 8. PLL PLL-IC2 is used to control the oscillating frequency of V

23、CO. IC2 is controlled by the serial control signal sent from the microprocessor IC6. The 12.6MHz reference frequency of IC2 oscillates the crystal oscillator X1 at the inside circuit. VHF IC2 compares the frequency gained by dividing the signal added to pin 8 of IC2 by the control signal from IC6 wi

24、th the frequency gained by dividing the reference frequency of 12.6MHz inside IC2. When the phase difference is found as a result of phase comparison, the pulse signal is output from the charge pump output of pin 5 of IC2, then the signal is converted into the DC voltage at the passive filter and ad

25、ded to the cathode side of VCO variable-capacitor D3 and D4 to make the phases equal. In result the stabilized oscillation can be done at the desired frequency. UHF IC2 compares the frequency gained by dividing the signal added to pin 8 of IC2 by the control signal from IC6 with the frequency gained

26、 by dividing the reference frequency of 12.6MHz inside IC2. When the phase difference is found as a result of phase comparison, the pulse signal is output from the charge pump output of pin 5 of IC2, then the signal is converted into the DC voltage at the passive filter and added to the cathode side

27、 of VCO variable-capacitor D9 and D11 to make the phases equal. In result the stabilized oscillation can be done at the desired frequency. 6 2) Transmitter 1. Microphone Amplifier The microphone amplifier IC301 has 2 operational amplifiers. The voice is converted into the electric signal through the

28、 microphone, and then supplied to IC301. The input signal is amplified and pre-emphasized to be output. VHF The signal output from microphone amplifier is adjusted the maximum frequency deviation at VR2. The adjusted signal is added to the cathode of VCO variable-capacitor D4 for deviation to change

29、 the capacity of the oscillation circuit resulting the FM deviation. UHF The signal output from microphone amplifier is adjusted the maximum frequency deviation at VR1. The adjusted signal is added to the cathode of VCO variable-capacitor D10 for deviation to change the capacity of the oscillation c

30、ircuit resulting the FM deviation. 2. Power Amplifier The oscillated signal at VCO is supplied to the power amplifier Q3, passing through buffer amplifier Q5, driver amplifier IC1. The power-amplified signal is supplied to the antenna through the duplexer after the harmonics are attenuated enough. 7

31、 3) M38268MCL069GP (XA1023) CPU Terminal Connection (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

32、83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 P67/AN7 P66/AN6 P65/AN5 P64/AN4 P63/SCLK22/AN3 P62/SCLK21/AN2 P61/SOUT2/AN1 P60/SIN2/AN0 P57/ADT/DA2 P56/DA1 P55/CNTR1 P54/CNTR0 P53/RTP1 P52/RTP0 P51/PWM1 P50/PWM0 P47/SRDY1 P46/SCLK1 P45/TXD P44/RXD P43/ /TOUT P42/INT2 P41/INT1 P40 P77 P76 P75

33、 P74 P73 P72 P71 P70/INT0 RESET XCIN XCOUT VSS XIN XOUT P27 P26 P25 P24 P23 P22 P21 P20 P17 P16 P15/SEG39 P14/SEG38 P13/SEG37 P12/SEG36 P11/SEG35 P10/SEG34 P07/SEG33 P06/SEG32 P05/SEG31 P04/SEG30 P03/SEG29 P02/SEG28 P01/SEG27 P00/SEG26 P37/SEG25 P36/SEG24 P35/SEG23 P34/SEG22 P33/SEG21 P32/SEG20 P31/

34、SEG19 P30/SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VCC VREF AVSS COM3 COM2 COM1 COM0 VL3 VL2 C2 C1 VL1 8 No. Terminal Signal I/O Description 1 P67/AN7 BP1 I Band plan 1 2 P66/AN6 BCHK I Battery detection input 3 P65/AN5 PCNT 0 Battery de

35、tection SW output 4 P64/AN4 SMT I S-meter input 5 P63/SCLK22/AN3 SQL I Noise level input for squelch 6 P62/SCLK21/AN2 TIN I CTCSS Tone input 7 P61/SOUT2/AN1 TLC O TX LED SW output 8 P60/SIN2/AN0 BAT I Battery charge voltage input 9 P57/ADT/DA2 TUNC/TONE O RX Tuning/Tone out 10 P56/DA1 PO O Power con

36、trol output 11 P55/CNTR1 C3C O C3V power ON/OFF output 12 P54/CNTR0 TBST O Tone burst output 13 P53/RTP1 PT3 I PTT input 14 P52/RTP0 CLK O Serial clock output 15 P51/PWM1 DATA/UL I/O Serial data output/Unlock input 16 P50/PWM0 STB1 O Strobe for PLL 17 P47/SRDY1 STB2 O Strobe for electronic volume 18

37、 P46/SCLK1 EAR O Earphone antenna SW output 19 P45/TXD CTX O Clone data transmission output 20 P44/RXD CRX I Clone data reception input 21 P43/TOUT BEEP/BP3 I/O Beep tone output/Band plan 3 22 P42/INT2 DET I DC-JACK detection input 23 P41/INT1 RE2 I Rotary encoder input 2 24 P40 RESW I Rotary encode

38、r push SW input 25 P77 RE1 I Rotary encoder input 1 26 P76 P3C O PLL power ON/OFF output 27 P75 PLC O Low VHF VCO ON/OFF output 28 P74 PUC O UHF VCO ON/OFF output 29 P73 PVC O VHF VCO ON/OFF output 30 P72 SDA I/O Serial data I/O for EEPROM 31 P71 SCL O Serial clock output for EEPROM 32 P70/INT0 BU I

39、 Back up signal detection input 33 RESET RESET I Reset input 34 XCIN NC 35 XCOUT NC 36 XIN XIN I Clock input 37 XOUT XOUT O Clock output 38 VSS VSS CPU GND 39 P27 V/M I V/M key input 40 P26 BAND I BAND key input 41 P25 SCAN I SCAN key input 42 P24 POWER I POWER key input 43 P23 FUNC I FUNC key input

40、 44 P22 MONI I MONI key input 45 P21 BUG O Bugging SW output 46 P20 CHG O Charge SW output 47 P17 R3C O RX power ON/OFF output 48 P16 BARC O Bar antenna SW output 49 P15/SEG39 BD1C O BND1 power SW output 50 P14/SEG38 BD2C O BND2 power SW output 9 No. Terminal Signal I/O Description 51 P13/SEG37 W/NC

41、 O Wide / Narrow SW output 52 P12/SEG36 FMC O FM SW output 53 P11/SEG35 T3C O T3V power ON/OFF SW output 54 P10/SEG34 TSWC O Tone power ON/OFF SW output 55 P07/SEG33 TUC O UHF-TX power ON/OFF SW output 56 P06/SEG32 TVC O VHF-power ON/OFF SW output 57 P05/SEG31 BD3C O BND3 power SW output 58 P04/SEG3

42、0 BD4C O BND4 power SW output 59 P03/SEG29 AMC O AM SW output 60 P02/SEG28 AFC O AF SW output 61 P01/SEG27 AFPC O AF power amp SW output 62 P00/SEG26 SD O RX-LED ON/OFF SW output 63 P37/SEG25 SEG25 O LCD segment signal 64 P36/SEG24 SEG24 O LCD segment signal 65 P35/SEG23 SEG23 O LCD segment signal 6

43、6 P34/SEG22 SEG22 O LCD segment signal 67 P33/SEG21 SEG21 O LCD segment signal 68 P32/SEG20 SEG20 O LCD segment signal 69 P31/SEG19 SEG19 O LCD segment signal 70 P30/SEG18 SEG18 O LCD segment signal 71 SEG17 SEG17 O LCD segment signal 72 SEG16 SEG16 O LCD segment signal 73 SEG15 SEG15 O LCD segment

44、signal 74 SEG14 SEG14 O LCD segment signal 75 SEG13 SEG13 O LCD segment signal 76 SEG12 SEG12 O LCD segment signal 77 SEG11 SEG11 O LCD segment signal 78 SEG10 SEG10 O LCD segment signal 79 SEG9 SEG09 O LCD segment signal 80 SEG8 SEG8 O LCD segment signal 81 SEG7 SEG7 O LCD segment signal 82 SEG6 SE

45、G6 O LCD segment signal 83 SEG5 SEG5 O LCD segment signal 84 SEG4 SEG4 O LCD segment signal 85 SEG3 SEG3 O LCD segment signal 86 SEG2 SEG2 O LCD segment signal 87 SEG1 SEG1 O LCD segment signal 88 SEG0 SEG0 O LCD segment signal 89 VCC VDD CPU power supply 90 VREF VDD AD converter power supply 91 AVS

46、S VDD AD converter GND 92 COM3 COM3 O LCD COM3 output 93 COM2 COM2 O LCD COM2 output 94 COM1 COM1 O LCD COM1 output 95 COM0 COM0 O LCD COM0 output 96 VL3 VL3 LCD power supply 97 VL2 VL2 LCD power supply 98 C2 NC 99 C1 NC 100 VL1 VL1 LCD power supply 10 SEMICONDUCTOR DATASEMICONDUCTOR DATA JRC 2070 *

47、 8765 4321 1) NJM2070M (XA0210) Audio Power Amplifier 1. NC 2. + INPUT 3. - INPUT 4. GND 5. GND 6. OUTPUT 7. V+ 8. NC 2) TC4W53FU (XA0348) Analog Multiplexer/De-multiplexer 8 7 6 5 1 2 3 4 4W53 * 6. ch1 7. ch0 8. VDD 1. COMMON 2. INH 3. VEE 4. VSS 5. A Contorol input INHA On channel LL LH H* ch0 ch1

48、 NONE * Dont care 33-* 3) XC62HR3302MR (XA0519) 3.3V Voltage Regulator 123 45 4. VSS 1. NC 2. VIN 5. VOUT 3. CE (Active high) 4510 * 58 7 6 4321 4. GND 1. Output 1 2. Inverting Input 1 3. Non-inverting Input 1 5. Non-inverting Input 2 6. Inverting Input 2 7. Output 2 8. V+ 4) BA4510FV (XA0537) Dual Operational Amplifires 11 58 7 6 4321 4. GND 1. Output 1 2. Inverting Input 1 3. Non-inverting Input 1 5. Non-inverting Input 2 6. Inverting Input 2 7. Output 2 8. V+ 2904 JRC * 5) NJM2904V (XA0573) Dual Operational Amplifires 6) TK10931V (XA0666) Narrow Band AM/FM IF IC