Alinco DJ-C7T/E Service Manual

							  
DJ – C7 T / E 
 Service Manual 
  
  
CONTENT
S 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 (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 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
 
PA RT S  L I S T  
    MAIN Unit..……………………………………….
    KEY Unit…………..………………………………
    BATTERY Unit..…………………………….…….
    PTT Unit…………………………………………..
    ROTARY ENCODER Unit………………………..
    Mechanical Parts…………………………………..
    Packing Parts………………………………………
  
ADJUSTMENT 
1) Required Test Equipment..……………………...
2) Entering and 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  88.100 – 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 ~ 60°C (+14°F ~ +140°F) 
Frequency stability  -7 ~ +3 ppm 
Antenna impedance  50ohm unbalanced (SMA) 
Supply Voltage  3.7 – 6.0VDC (External) 
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) 
  
  
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 circuit  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 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] 
Single 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 input 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 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 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 adjacent 
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 the 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 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. 
  
[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 input 
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 IF 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 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/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. 
  
  
   
						

							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 consists 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 VCO. 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 with 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 added 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 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 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 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 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 circuit 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 
3) M38268MCL069GP (XA1023) 
    CPU 
  
 Terminal Connection 
 (TOP VIEW) 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
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							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 detection 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 control 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  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/φ/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 encoder 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  Back up signal detection input 
33 RESET  RESET I  Reset input 
34 XCIN  NC µ µ 
35 XCOUT  NC µ µ 
36 XIN  XIN I  Clock input 
37 XOUT  XOUT O  Clock output 
38 VSS  VSS µ 
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 
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  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/SEG30  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 SWçoutput 
63  P37/SEG25  SEG25  O  LCD segment signal 
64  P36/SEG24  SEG24  O  LCD segment signal 
65  P35/SEG23  SEG23  O  LCD segment signal 
66  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 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  SEG6  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 µ 
CPU power supply 
90 VREF  VDD µ 
AD converter power supply 
91 AVSS  VDD µ 
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 µ 
LCD power supply 
97 VL2  VL2 µ 
LCD power supply 
98 C2  NC µ µ 
99 C1  NC µ µ 
100 VL1  VL1 µ 
LCD power supply  
						

							10 
  















 








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