Alinco DJ-C7 User Guide
DJ – C7 T / E
Service Manual
CONTENTSS
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……………………….………….…..
PART S L I S T
2
MAIN Unit..……………………………………….
2
KEY Unit…………..………………………………
2
BATTERY Unit..…………………………….…….
PTT Unit…………………………………………..
ROTARY ENCODER Unit………………………..
Mechanical Parts…………………………………..
3-5
Packing Parts………………………………………
6
7-9
ADJUSTMENT
10
10
10
10
11
11
11
12
12
12
12
13
13
14
14
15
16
1) Required Test Equipment..……………………...
2) Entering and Releasing the Adjustment Mode….
PC BOARD VIEW…………………………..
SCHEMATIC DIAGRAM………………...
BLOCK DIAGRAM………………………...
17
18
19-22
22-23
23
23
23
23
23
24
25-28
29-33
34-35
36
ALINCO, INC.
SPECIFICATIONS
General
Type DJ – C7T DJ-C7E
Transmitter Range
Receiving Range
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
Transmit
Current drain
Dimensions (Projection exclusive) 58 (w) x 96 (h) x 14.5 (d) mm
Weight Approx. 102g (EBP-58N inclusive)
Receive Approx. 70mA
Battery Save Approx. 19mA
Transmitter
Type DJ-C7T DJ-C7E
Output power
Modulation System Variable reactance frequency modulation
Maximum Frequency Deviation +/- 5kHz
Spurious Emission - 60 dB c or less
Microphone impedance Approx. 2kohm
DC6.0V Approx. 0.5W
EBP-58N equipped Approx. 0.3W
Receiver
Type DJ-C7T DJ-C7E
Receiver circuit Double conversion super-heterodyne
Intermediate frequency
Sensitivity (12dB SINAD)
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.
VHF 144.000 – 147.995MHz 144.000 – 145.995MHz
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
UHF 380.000 – 511.995MHz 430.000 – 439.995MHz
DC6.0V: VHF Approx. 0.28A, UHF Approx. 0.32A
3.7V(EBP-58N): VHF Approx. 0.25A, UHF Approx. 0.30A
1st 50.85MHz (FM/AM), 10.7MHz (WFM)
2nd 450MHz (FM/AM)
144.000 – 147.995MHz
420.000 – 449.995MHz
-15dBu or less
144.000 – 145.995MHz
430.000 – 439.995MHz
-15dBu or less
2
CIRCUIT DESCRIPTION
1) Reception
1. RX Method
2. Front End
3. Mixer
[FM/AM]
Double Super Heterodyne Method
1st IF: 50.85MHz
2nd IF: 450kHz
[WFM]
Single Super Heterodyne Method
1st IF: 10.7MHz
[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.
[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.
3
4. IF
5. Squelch
6. Audio
[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.
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.
[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.
4
7. VCO
8. PLL
[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.
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.
5
2) Transmitter
1. Microphone Amplifier
2. Power 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.
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.
6
3) M38268MCL069GP (XA1023)
CPU
Terminal Connection
(TOP VIEW)
P30/SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
70
71
72
73
74
75
VCC
VL3
VL2
VL1
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
C2
98
C1
99
100
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
VREF
AVSS
COM3
COM2
COM1
COM0
P33/SEG21
P32/SEG20
P31/SEG19
67
68
69
P36/SEG24
P35/SEG23
P34/SEG22
64
65
66
P01/SEG27
P00/SEG26
P37/SEG25
61
62
63
P04/SEG30
P03/SEG29
P02/SEG28
58
59
60
P07/SEG33
P06/SEG32
P05/SEG31
55
56
57
P12/SEG36
P11/SEG35
P10/SEG34
52
53
54
P13/SEG37
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
P14/SEG38
P15/SEG39
P16
P17
P20
P21
P22
P23
P24
P25
P26
P27
VSS
XOUT
XIN
XCOUT
XCIN
RESET
P70/INT0
P71
P72
P73
P74
P75
P76
123456789
P67/AN7
P66/AN6
P65/AN5
P64/AN4
P60/SIN2/AN0
P61/SOUT2/AN1
P63/SCLK22/AN3
P62/SCLK21/AN2
101112131415161718192021222324
P56/DA1
P55/CNTR1
P54/CNTR0
P57/ADT/DA2
P53/RTP1
P52/RTP0
P51/PWM1
P50/PWM0
P47/SRDY1
P46/SCLK1
P45/TXD
P44/RXD
P43/ /TOUT
P40
P42/INT2
P41/INT1
25
P77
7
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
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
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
8
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 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
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
90 VREF VDD
91 AVSS VDD
−
−
−
CPU power supply
AD converter power supply
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
97 VL2 VL2
98 C2 NC
99 C1 NC
100 VL1 VL1
−
−
LCD power supply
LCD power supply
− −
− −
−
LCD power supply
9
SEMICONDUCTOR DATA
1) NJM2070M (XA0210) Audio Power Amplifier
8765
2070
*****
JRC
4321
2) TC4W53FU (XA0348) Analog Multiplexer/De‑multiplexer
7
8
1234
65
4W53
**
1. NC
2. + INPUT
3. ‑ INPUT
4. GND
5. GND
6. OUTPUT
7. V+
8. NC
1. COMMON
2. INH
3. VEE
4. VSS
5. A
6. ch1
7. ch0
8. VDD
Contorol input
INH A
LL
LH
H*
* Don't care
On channel
ch0
ch1
NONE
3) XC62HR3302MR (XA0519) 3.3V Voltage Regulator
5
33‑*
123
4) BA4510FV (XA0537) Dual Operational Amplifires
4510
****
4
5876
1. NC
2. VIN
3. CE (Active high)
4. VSS
5. VOUT
1. Output 1
2. Inverting Input 1
3. Non‑inverting Input 1
4. GND
5. Non‑inverting Input 2
6. Inverting Input 2
7. Output 2
8. V+
10
4321
5) NJM2904V (XA0573) Dual Operational Amplifires
5876
1. Output 1
2. Inverting Input 1
3. Non‑inverting Input 1
2904
***
JRC
4. GND
5. Non‑inverting Input 2
6. Inverting Input 2
7. Output 2
8. V+
4321
6) TK10931V (XA0666) Narrow Band AM/FM IF IC
131415161718192021222324
GND
10931
RECT
COMP
AMP
Vref
AGC
***
AM
AMP
123456789101112
OSC
MIXER
131415161718192021222324
Vcc
AM DET
RSSI
FM DET
FM
AMP
Vcc
109876543211112
7) BU9831F (XA0882) Non‑volatile Electronic Potentionmeter
8765
1. CS
2. SK
3. DIO
4. GND9831
5. VL
****
6. VW
7. VH
4321
8. Vcc
11
8) uPC2771TB (XA0953) MMIC Medium Output Power Amplifier
123
1. INPUT
2. GND
C2H
3. GND
4. OUTPUT
5. GND
456
6. Vcc
9) uPC2757TB (XA0953) MMIC 1st Frequency Down‑converter
123
1. RF INPUT
2. GND
C1X
3. LO INPUT
4. PS
5. Vcc
456
6. IF OUTPUT
10) BR24L32FV (XA1008) 4k x 8bit EEPROM
5876
L32
****
**
1. A0
2. A1
3. A2
4. Vss
5. SDA
6. SCL
7. WP
8. Vcc
Name Function
A0...A2
Vss
SDA
SCL
WP
User configurable
chip selects
Ground
Serial address/data I/O
Serial clock
Write protect input
12
Vcc
+2.5V ‑ 6.0V Power supply
4321
11) BD4930FVE (XA1009) 3.0V Voltage Detector
5
4
1. VOUT
2. GND (Substrate)
FL*
***
3. N.C.
4. GND
5. VDD
123
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