Alinco DJ-G5 Service Manual

DJ-G5
Service Manual
CONTENTS
+ SPECIFICATIONS2+ PARTS LIST
      RF Unit 37~40
      IF Unit 41~44
+ CIRCUIT DESCRIPTION      CPU Unit 44~46
   1) Receiver System 3~5       SVV UniL 46
   2) Transmitter System 5      UVCO Unit 46
   3) PLL Synthesizer Circuit 6       VVCO Unit 47
   4) CPU and Peripheral Circuit 6~7      CHARGE Unit 47
   5) Terminal function of CPU 10~12       PTT Unit 47
   6) Terminal function of 4094 13       Mechanical Parts 48
   7) Frequency Table 13
+ SEMICONDUCTOR DATA +...

 General
VHF UHF
DJ-G5T L-band108.000~173.995
    (AM FM)420.000~479.995
        (FM)
Receiver range(MHz) R-band1 30.000~l 73.995
     (FM)
DJ-G5E 144.000~145.995 430.000~439.995
Transmitter  range(
MDJ-G5T 144.000~147.995 438.000~449.995
DJ-G5E 144.000~145.995 430.000~439.995
Modulation
Antenna impedance
Operating temperature range
Supply voltage (rated voltage) External (V)
Ni-Cd(V)
Tx Hi: 13.8VDC(external) approx. 1.4A approx. 1.5A
Tx Hi: 9.6VDC(Ni-Cd) approx. 1.4A approx. 1.5A
Tx Hi: 7.2VDC(Ni-Cd)...

CIRCUIT DESCRIPTTON
1) Receiver System
The receiver system is the double-conversion superheterodyne. ln L band the first
IF is 38.9MHz and second IF is 455kHz, and in R band the first IF is 45.1MHz and
second IF is 455kHz.
1 Front End
1-1 108.00MHz~ 173.995MHz (144M Band Main)
The receiving signal is passed through the low-pass filter (L90, L91 , L92, C220,
C229, C230, C231, C235), and amplified in RF amplifier (Q77), then led to the
resonant circuit (L85, L86, varicap D68, D69). The signal is amplified...

3 Demodulation
3-1 L Band
After amplified in the first IF amplifier (Q78), the signal is fed to the demodulation
IC (IC302) Pin24. The first IF signal outputted to Pin24 (38.9MHz) is mixed in the
mixer of IC302 with the local signal of 38.455MHz which is oscillated in the
oscillation circuit of IC302 and the crystal oscillator (X303), then converted into the
second IF signal of 455kHz. The second IF is supplied from the IC302 Pin3. After
eliminating unwanted signal by the ceramic filter (FL302), the...

5-2 R Band
A part of the audio signal of IC301 Ping is selected and amplified by the noise
amplifiers in R316, R317, R318, R319, C318, C319, C320, and IC301. Then it is
supplied from IC301 Pin11 to be amplified again in the noise amplifier (Q303). The
amplified noise factor is rectified in D301 , adjusted the level in VR30l , and applied
to CPU (IC508) Pin97, then converted to the dligital signal.
6 Attenuator Circuit
6-1 VHF Band
When the ATT key is pressed, L is applied from shift resistor (IC52)...

3) PLL Synthesizer Circuit
1 PLL
 The data is sent to the PLL IC (IC53) Pin2 and the clock is sent to Pin3 from CPU
(IC508), then the ratio of the division is decided each in L band and R band.
Each VCO oscillating signal is amplified in the buffer (Q73: L band, Q66: R band),
and the signal in L band is applied to Pin15, then the signal in R band is applied to
Pin6. The programmable divider of IC53 is determined by frequency data, and it
divides (1/N) input signal of IC53. Resulting signal will be 5kHz...

2 Display Lamp Circuit
The regulated power supply circuit consisting of Q505, Q507, R508, R509 supplies
H from CPU (IC508) when LAMP key is pressed. Then it is applied to the base
of Q507, and the voltage of 3.5V is outputted from the collector of Q505. lt is fed
to each LED (D503~D506, D509,D511 ,D513,D514).
3 Reset and Backup Circuit
When the voltage of approximately 3.0V or more is supplied from the external (DC
jack, battery), the reset signal of H level is outputted from Reset IC (IC506), and
it is...

5) Terminal function of CPU
No. Name Pin Name I/O
DescriptionH L HiZ
1 ANO +BD I
Power supply voltage detectionAnalog lN
2 AVSS GND /
Analogground
3 TEST GND /Connect to ground
4 X2 OPENOpen when not used
5 X1 VDD /Power supply
6 VSS GND /Ground
7 OSC1 OSC1 IInternal oscillator input
8 OSC2 OSC2 OInternal osciIIator output
9 RES REST ICPU resetAt work
10 NMl VDD /
11 P20 CLK O
Clock inputPulse Normal
12 P21 DATA O
Data inputPulse Normal
13 P22 STB1 O
RF4094 strobePulse Normal
14 P23 STB2 O
lF4094...

No. Name Pin Name IIoDescriptionH L HiZ
51 P67 KIN4 I
Key matrix input4OFF ON
52 P70 KOT1 O
Key matrix output1OFF ON
53 P71 KOT2 O
Key matrix output2OFF ON
54 P72 KOT3 O
Key matrix output3OFF ON
55 P73 KOT4 O
Key matrix output4OFF ON
56 P74 PRST O
PLL reset pulse input judgementNormal Pulse
57 P75 SDA I/O
EEPROM dataPL SE Normal
58 P76 SCL O
EEPROM clockPL SE Normal
59 P77 50SW O
5V ON/OFFON OFF
60 P80 OPEN /
61 P81 TFD O
Full duplex ON/OFF when transmittinFull duplex Normal
62 P82 UTBST O
Right side TX...

6) Terminal function of 4094
4094 p
oPort Name Function Logic Description
VHF
145
MHz
VHF
433
MHz
UHF
433
MHz
UHF
145
MHz
BS
OFF
TIME
Q11 UHl UHF high power control Active Low Low power H H H H H
Q12 UMlD UHF middle power control Active Low UHF middle=H H H H H H
Q13 VHl VHF high power control Active Low Low power H H H H H
Q14 VMID VHF middle power control Active Low VHF middle=H H H H H H
Q15 VATTC VHF RX attenuater control Active Low ATT ON H/L H/L H/L H/L H
Q16 UATTC UHF RX attenuater control Active...