Alinco DJ-C7 E, DJ-C7 T Service Manual

DJ - C7 T / E

Service Manual

CONTENTS

SPEC IFICATIONS

General.................................................................................2

Transmitter..................................................................

Receiver......................................................................

CIRCU IT D ISC RIPTION

1) Receiver System

2) Transmitter System................................................

3) M38268MCL069GP (XA1023)

.................................................... 3-5

..........................

SEM ICONDUCTOR 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)

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7-9

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..........10

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12

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PARTS LIST

MAIN Unit
2
2

6

KEY Unit..........................................................................22-23

BATTERY Unit........................................................... 23

PTT Unit

ROTARY ENCODER Unit....................................... 23

Mechanical Parts........................................................ 23

Packing Parts............................................................... 23

..................................................................

..................................................................... 23

ADJUSTMENT

1) Required Test Equipment

10
10
10

11
11
11
12
12
12

13
13
14
14
15
16

2) Entering and Releasing the Adjustment Mode.... 25-28

PC BOARD V IEW

SCHEMATIC DIA G RAM .........................

BLOC K DIA G RAM

......................................

.......................................

....................................

.....

19-22

24

...

29-33

...

34-35

36

EX PLODED VIEW

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

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

........

.........

17
18

ALINCO, INC.

SPECIFICATIONS

General

Type

Transmitter Range

Receiving Range

Modulation F3E
Operating temperature
Frequency stability

Antenna impedance 50ohm unbalanced (SMA)

Supply Voltage 3.7 - 6.0VDC (External)

Ground method Negative ground

Transmit

Current drain

Dimensions (Projection exclusive)
Weight Approx. 102g (EBP-58N inclusive)

Receive
Battery Save Approx. 19mA

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

3.7V(EBP-58N): VHF Approx. 0.25A, UHF Approx. 0.30A

DJ - C7T DJ-C7E

-10 °C ~ 60°C (+14°F ~ +140°F)

-7 ~ +3 ppm

DC6.0V: VHF Approx. 0.28A, UHF Approx. 0.32A

Approx. 70mA

58 (w) x 96 (h) x 14.5 (d) mm

Transmitter

Type

Output power
Modulation System

Maximum Frequency Deviation +/- 5kHz

Spurious Emission

Microphone impedance

DC6.0V
EBP-58N equipped

DJ-C7T DJ-C7E

Approx. 0.5W
Approx. 0.3W

Variable reactance frequency modulation

- 60 dB c or less
Approx. 2kohm

Receiver

Type

Receiver circuit
Intermediate frequency

Sensitivity (12dB SINAD)

Audio output power

Spurious response
Squelch sensitivity

1st

2nd

144.000 - 147.995MHz

420.000 - 449.995MHz

100mW or more (Max) / 90mW or more (8ohm, 10 % THD)

DJ-C7T DJ-C7E

Double conversion super-heterodyne

50.85MHz (FM/AM), 10.7MHz (WFM)
450MHz (FM/AM)

-15dBu or less

60 dB or less

Approx. - 18 dBu or less

144.000 - 145.995MHz

430.000 - 439.995MHz

-15dBu or less

! NOTE: All specifications are subject to change without notice or obligation.

2

CIRCUIT DESCRIPTION

1) Reception

1. RX M ethod
[FM/AM]

Double Super Heterodyne Method

1st IF: 50.85MHz

2nd IF: 450kHz

[WFM]
Single Super Heterodyne Method

1st IF: 10.7MHz

2. Fro nt 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.

3. M ixer

[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

[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

6. Audio

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. P LL

[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. M icrophone 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

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3) M38268MCL069GP (XA1023)

CPU

P67/AN7 -«—► [][
P66/AN6 -—^[2
P65/AN5 ■*—►[3

P64/AN4 ■*—►[J
P63/SCLK22/AN3 -*—*-[5
P62/SCLK21/AN2 -«—► [][

P61/S0UT2/AN 1 ——► [£

P60/SIN2/ANO •*—► [8

P57/ADT/DA2 -—^[9

P56/DA1 —— E

P55/CNTR1 -«—► [[]
P54/CNTRO -—►[H

P53/RTP1 -«—► [[3
P52/RTPO-«—►|I4
P51/PWM1 ■*—► [[5

P50/PWM0-*—►[IS
P47/SRDYT-«—► [17
P46/SCLK1 ——►[IS

P45/TXD -—►US
P44/RXD ——►|2C

P43/?i/TOUT -—►|2]

P42/INT2 -—^|22

P41/INT1 -—^|23

P40-—^|24
P77 -—►|25

O

—j —j — jrooo«O00C'0C'0C'0C'0C'0C'0C'0C'0i—i1

Q U i ^O O M h - O W — O Z d M S G ) U l ^ O O t \ 3 M O S

-SEG13

-SEG14

-SEG15

-SEG16

-SEG17

-P30/SEG18

-P31/SEG19

-P32/SEG20

-P33/SEG21

-P34/SEG22

-P35/SEG23

-P36/SEG24

-P37/SEG25

-P00/SEG26

-P01/SEG27

-P02/SEG28

-P03/SEG29

-P04/SEG30

-P05/SEG31

-P06/SEG32

-P07/SEG33

-P10/SEG34

-PI1/SEG35

-P12/SEG36

-P13/SEG37

CT5 cn hfca.

—I

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
6 P62/SCLK21/AN2
7

P61/SOUT2/AN1 TLC O TX LED SW output

TIN

8 P60/SIN2/AN0 BAT I
9 P57/ADT/DA2 TUNC/TONE

10 P56/DA1
11 P55/CNTR1

PO O Power control output

C3C O
12 P54/CNTR0 TBST
13 P53/RTP1 PT3 I
14 P52/RTP0 CLK
15 P51/PWM1 DATA/UL

I/O Serial data output/Unlock input
16 P50/PWM0 STB1
17 P47/SRDY1 STB2
18 P46/SCLK1 EAR
19 P45/TXD CTX

20 P44/RXD CRX I
21 P43/p/TOUT BEEP/BP3

I/O Beep tone output/Band plan 3

I

O RX Tuning/Tone out

O Tone burst output

O Serial clock output

O Strobe for PLL
O Strobe for electronic volume
O Earphone antenna SW output
O Clone data transmission output

Noise level input for squelch

CTCSS Tone input

Battery charge voltage input

C3V power ON/OFF output

PTT input

Clone data reception input

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
27 P75
28 P74
29 P73
30 P72 SDA

P3C O

PLC O Low VHF VCO ON/OFF output
PUC O
PVC O

I/O Serial data I/O for EEPROM
31 P71 SCL
32 P70/INT0

BU

33 RESET RESET I
34
35 XCOUT
36

XCIN NC

NC

XIN XIN

37 XOUT XOUT
38

VSS VSS
39 P27 V/M I
40 P26 BAND I
41 P25

SCAN
42 P24 POWER I
43 P23
44 P22
45 P21
46 P20
47 P17
48 P16
49 P15/SEG39
50 P14/SEG38

FUNC
MONI

BUG O Bugging SW output
CHG O Charge SW output

R3C O

BARC O Bar antenna SW output

BD1C O

BD2C O

O

I

— —
— —

I Clock input

O Clock output
—

I

I
I

PLL power ON/OFF output

UHF VCO ON/OFF output
VHF VCO ON/OFF output

Serial clock output for EEPROM

Back up signal detection input

Reset input

CPU GND

V/M key input

BAND key input

SCAN key input

POWER key input

FUNC key input
MONI key input

RX power ON/OFF output

BND1 power SW output
BND2 power SW output

8

No. Terminal Signal I/O
51 P13/SEG37
52 P12/SEG36
53 P11/SEG35
54 P10/SEG34
55 P07/SEG33
56 P06/SEG32
57 P05/SEG31
58 P04/SEG30
59 P03/SEG29
60 P02/SEG28
61 P01/SEG27

W/NC O Wide / Narrow SW output

FMC O FM SW output

T3C O T3V power ON/OFF SW output

TSWC O Tone power ON/OFF SW output

TUC O

TVC O
BD3C O
BD4C O

AMC O AM SW output

AFC O AF SW output

AFPC O

62 P00/SEG26 SD
63 P37/SEG25 SEG25
64 P36/SEG24 SEG24
65 P35/SEG23 SEG23
66 P34/SEG22 SEG22
67 P33/SEG21 SEG21
68 P32/SEG20 SEG20
69 P31/SEG19 SEG19
70 P30/SEG18 SEG18
71 SEG17 SEG17
72 SEG16 SEG16
73 SEG15 SEG15
74 SEG14 SEG14
75 SEG13 SEG13
76 SEG12 SEG12
77

SEG11 SEG11 O LCD segment signal
78 SEG10 SEG10
79 SEG9 SEG09
80 SEG8 SEG8
81 SEG7 SEG7
82 SEG6 SEG6
83 SEG5 SEG5
84 SEG4 SEG4
85 SEG3 SEG3
86 SEG2 SEG2
87

SEG1 SEG1 O LCD segment signal
88 SEG0 SEG0
89

VCC

VDD
90 VREF VDD
91

AVSS

VDD
92 COM3 COM3
93 COM2 COM2
94 COM1 COM1
95 COM0 COM0
96 VL3 VL3
97 VL2 VL2
98 C2
99

C1 NC

NC

100 VL1 VL1

Description

UHF-TX power ON/OFF SW output

VHF-power ON/OFF SW output

BND3 power SW output
BND4 power SW output

AF power amp SW output

O

RX-LED ON/OFF SW output
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal

O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal
O LCD segment signal

O LCD segment signal
—

—
—

O
O
O
O

—
—

CPU power supply

AD converter power supply

AD converter GND
LCD COM3 output
LCD COM2 output
LCD COM1 output
LCD COM0 output

LCD power supply
LCD power supply

— —
— —
—

LCD power supply

9

SEMICONDUCTOR DATA

1) NJM2070M (XA0210) Audio Power Amplifier
8 7 6 5

R H R R

O JRC

y y y y

1 2 3 4

2) TC4W53FU (XA0348) Analog Multiplexer/De-multiplexer
8 7 6 5 1. COMMON

W R W R 2. INH

□ □ □ □

1 2 3 4

1. NC

2. + INPUT

3. - INPUT

4. GND

5. GND

6. OUTPUT

7. V+

8. NC

3. VEE

4. VSS

5. A

6. ch1

7. ch0

8. VDD

Contorol input

INH A

L L
L H ch1
H

* Don’t care

*

On channel

ch0

NONE

3) XC62HR3302MR (XA0519) 3.3V Voltage Regulator
5

n

4) BA4510FV (XA0537) Dual Operational Amplifires

8 7 6 5

4

a

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

12 3 4

5) NJM2904V (XA0573) Dual Operational Amplifires

8 7 6 5 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+

12 3 4

6) TK10931V (XA0666) Narrow Band AM/FM IF IC

24 23 22 21 20 19 18 17 16 15 14 13

10931

***

o

H M HFM m H H

1 2 3 4 5 6 7 8 9 10 11 12

7) BU9831F (XA0882) Non-volatile Electronic Potentionmeter

8 7 6 5 1 . CS

R R H R

2. SK

3. DIO

4. GND

5. VL

6. VW

F ¥ ¥ T 7. VH

1 2 3 4 8. Vcc

11

8) uPC2771TB (XA0953) MMIC Medium Output Power Amplifier
1 2 3

n n n

C2H

1. INPUT

2. GND

3. GND

4. OUTPUT

5. GND

6 5 4

6. Vcc

9) uPC2757TB (XA0953) MMIC 1st Frequency Down-converter
1 2 3

PPP

1. RF INPUT

2. GND

3. LO INPUT

4. PS

b b b

6 5 4

10) BR24L32FV (XA1008)
8 7 6 5

5. Vcc

6. IF OUTPUT

4k x 8bit EEPROM

1.

2.

3.

4.

5.

6.

7.

8.

A0
A1
A2
Vss

SDA

SCL
WP
Vcc

Name Function

A0...A2

Vss Ground

SDA
SCL Serial clock

WP Write protect input

User configurable
chip selects

Serial address/data I/O

12

Vcc +2.5V - 6.0V Power supply

1234

11) BD4930FVE (XA1009) 3.0V Voltage Detector
5

n

4

a

1. VOUT

2. GND (Substrate)

3. N.C.

4. GND

ü b ü

5. VDD

1 2 3