DR-135 / DR-235 / DR-435
Service Manual
CONTENTS
SPECIFICATIONS
GENERAL ........................................................................................ 2
TRANSMITTER ................................................................................ 2
RECEIVER ....................................................................................... 2
CIRCUIT DESCRIPTION DR-135
1) Receiver System (DR-135) ........................................................... 3, 4
2) Transmitter System (DR-135) ....................................................... 4, 5
3) PLL Synthesizer Circuit (DR-135) ................................................. 5, 6
4) Receiver System (DR-235) ........................................................... 6, 7
5) Transmitter System (DR-235) ....................................................... 7, 8
6) PLL Synthesizer Circuit (DR-235) ................................................. 8, 9
7) Receiver System (DR-435) ......................................................... 9, 10
8) Transmitter System (DR-435) ......................................................... 10
9) PLL Synthesizer Circuit (DR-435) ................................................... 11
10) CPU and Peripheral Circuits(DR-135 DR-235 DR-435) ............. 11,12
11) Power Supply Circuit ....................................................................... 13
12) M3826M8269GP (XA0818) ....................................................... 14~16
SEMICONDUCTOR DATA
1) M5218FP (XA0068) ........................................................................ 17
2) NJM7808FA (XA0102) .................................................................... 17
3) TC4S66F (XA0115) ........................................................................ 17
4) TK10930VTL (XA0223) .................................................................. 18
5) BU4052BF (XA0236) ...................................................................... 19
6) TC4W53FU (XA0348) .................................................................... 19
7) M64076GP (XA0352) ..................................................................... 20
8) LA4425A (XA0410) ......................................................................... 21
9) M67746 (XA0412) .......................................................................... 21
10) M68729 (XA0591) .......................................................................... 22
11) M57788 (XA0077A) ........................................................................ 23
12) mPC2710T (XA0449) ..................................................................... 24
13) NJM2902 (XA0596) ........................................................................ 24
14) 24LC32A (XA0604) ........................................................................ 25
15) S-80845ALMP-EA9-T2 (XA0620) ................................................... 25
16) L88MS05TLL (XA0675) .................................................................. 25
17) AN8010M (XA0119) ....................................................................... 26
18) TK10489M (XA0314) ...................................................................... 26
19) Transistor, Diode, and LED Ontline Drawings .................................. 27
20) LCD Connection (TTR3626UPFDHN) ........................................... 28
EXPLODED VIEW
1) Top and Front View ......................................................................... 29
2) Bottom View .................................................................................... 30
3) LCD Assembly ................................................................................ 31
PARTS LIST
CPU .......................................................................................... 32, 33
Main Unit(DR-135) .................................................................... 33~36
Main Unit(DR-235) .................................................................... 36~39
VCO Unit(DR-235) ......................................................................... 39
Main Unit(DR-435) .......................................................................... 42
VCO Unit(DR-435) ......................................................................... 42
Mechanical Parts ............................................................................ 43
Packing Parts ................................................................................. 43
ACCESSORIES .............................................................................. 43
ACCESSORIES(SCREW SET) ...................................................... 43
TNC(EJ41U) .................................................................................. 44
TNC (EJ41U) Packing Parts ........................................................... 45
DR-135 ADJUSTMENT
1) Adjustment Spot ............................................................................ 46
2) VCO and RX Adjustment Specification ........................................... 47
3) Tx Adjustment Specification ............................................................ 47
4) Rx Test Specification ....................................................................... 48
5) Tx Test Specification ....................................................................... 49
DR-235 ADJUSTMENT
1) Adjustment Spot ............................................................................ 50
2) VCO and RX Adjustment Specification ........................................... 51
3) Tx Adjustment Specification ............................................................ 51
http://www.DataSheet4U.net/ 4) Rx Test Specification ....................................................................... 52
5) Tx Test Specification ....................................................................... 53
DR-435 ADJUSTMENT
1) Adjustment Spot ............................................................................ 54
2) VCO and RX Adjustment Specification ........................................... 55
3) Tx Adjustment Specification ............................................................ 55
4) Rx Test Specification ....................................................................... 56
5) Tx Test Specification ....................................................................... 57
PC BOARD VIEW
1) CPU Unit Side A ............................................................................. 58
2) CPU Unit Side B ............................................................................. 58
3) Main Unit Side A DR-135 (UP 0400B) ............................................. 59
4) Main Unit Side B DR-135 (UP 0400B) ............................................. 59
5) Main Unit Side A DR-235 (UP 0414) ............................................... 60
6) Main Unit Side B DR-235 (UP 0414) ............................................... 60
7) Main Unit Side A DR-435 (UP 0415) ............................................... 61
8) Main Unit Side B DR-435 (UP 0415) ............................................... 61
9) Tnc Unit Side A (UP 0402) (DR-135TP only) .................................. 62
10) Tnc Unit Side B (UP 0402) (DR-135TP only) .................................. 62
SCHEMATIC DIAGRAM
1) CPU Unit DR-135 / DR-235 / DR-435 ............................................. 63
2) Main Unit DR-135 ........................................................................... 64
3) Main Unit DR-235 ........................................................................... 65
4) Main Unit DR-435 ........................................................................... 66
5) TNC Unit (DR-135TP only) ............................................................. 67
BLOCK DIAGRAM
1) DR-135 ........................................................................................... 68
2) DR-235 ........................................................................................... 69
3) DR-435 ........................................................................................... 70
ALINCO,INC.
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5. VCO Circuit
6. VCO Shift Circuit
A Colpitts oscillation circuit driven by Q131 directly oscillates the desired frequency.
The frequency control voltage determined in the CPU (IC1) and PLL circuit is
input to the varicaps (D122 and D123). This change the oscillation frequency,
which is amplified by the VCO buffer (Q134) and output from the VCO area.
During transmission or the AIR band Reception (118~136 MHz), the VCO shift
circuit turns ON Q138, change control the capacitance of L123 and safely
oscillates the VCO by means of H signal from pin 16 of IC116.)
4) Receiver System (DR-235)
The receiver system is a double superheterodyne system with a 30.85 MHz first IF and a 455 kHz second IF.
1. Front End
The received signal at any frequency in the 216.000MHz to 279.995MHz range
is passed through the low-pass filter (L116, L115, L114, L113, C204, C203,
C202, C216 and C215) and tuning circuit (L105, L104 and D105, D104), and
amplified by the RF amplifier (Q107). The signal from Q107 is then passed
through the tuning circuit (L103, L107, L102, and varicaps D103, D107 and
D102) and converted into 30.85 MHz by the mixer (Q106). The tuning circuit,
which consists of L105, L104, varicaps D105 and D104, L103, L107, L102,
varicaps D103, D107 and D102, is controlled by the tracking voltage form the
VCO. The local signal from the VCO is passed through the buffer (Q112), and
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supplied to the source of the mixer (Q106).The radio uses the lower side of the
superheterodyne system.
2. IF Circuit
The mixer mixes the received signal with the local signal to obtain the sum of
and difference between them. The crystal filter (XF102, XF101) selects 30.85
MHz frequency from the results and eliminates the signals of the unwanted
frequencies.The first IF amplifier (Q105) then amplifies the signal of the selected
frequency.
3. Demodulator Circuit
After the signal is amplified by the first IF amplifier (Q105), it is input to pin 24 of
the demodulator IC (IC108). The second local signal of 30.395 MHz, which is
oscillated by the internal oscillation circuit in IC108 and crystal (X104), is input
through pin 1 of IC108.Then, these two signals are mixed by the internal mixer
in IC108 and the result is converted into the second IF signal with a frequency
of 455 kHz. The second IF signal is output from pin 3 of IC108 to the ceramic
filter (FL101 or FL102), where the unwanted frequency band of that signal is
eliminated, and the resulting signal is sent back to the IC108 through pins 5.
The second IF signal input via pin 5 is demodulated by the internal limiter
amplifier and quadrature detection circuit in IC108, and output as an audio
signal through pin 12.
6
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2. Dimmer Circuit
The dimmer circuit makes the output of pin 13 of CPU (IC1) into "H" level at set
mode, so that Q9 and Q3 will turn ON to make the lamp control resistor R84
short and make its illumination bright. But on the other hand, if the dimmer
circuit makes pin 13 into "L" level, Q9 and Q3 will turn OFF, R84's illumination
will become dimmer as its hang on voltage falls down in the working LED (D11,
D2, D5, D3 and D6).
3. Reset and Backup
When the power form the DC cable increases from Circuits 0 V to 2.5 or more,
"H" level reset signal is output form the reset IC (IC4) to pin 33 of the CPU
(IC1), causing the CPU to reset. The reset signal, however, waits at 100, and
does not enter the CPU until the CPU clock (X1) has stabilized.
4. S(Signal) Meter Circuit
The DC potential of pin 16 of IC106 is input to pin 1 of the CPU (IC1), converted
from an analog to a digital signal, and displayed as the S-meter signal on the
LCD.
5. DTMF Encoder
6. Tone Encoder
The CPU (IC1) is equipped with an internal DTMF encoder. The DTMF signal
is output from pin 10, through R35, R34 and R261 (for level adjustment), and
then through the microphone amplifier (IC114:A), and is sent to the varicap of
the VCO for modulation. At the same time, the monitoring tone passes through
the AF circuit and is output form the speaker.
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The CPU (IC1) is equipped with an internal tone encoder.The tone signal (67.0
to 250.3 Hz) is output from pin 9 of the CPU to the varicap (D122 and D123) of
the VCO for modulation.
7. DCS Encoder
The CPU (IC1) is equipped with an internal DCS code encoder. The code
(023 to 754) is output from pin 9 of the CPU to the varicap (D124) of the
PLL reference oscillator. When DCS is ON, DCS MUTE circuit (Q126-ON,
Q133-ON, Q132-OFF) works. The modulation activates in X103 side only.
8. CTCSS, DCS Decoder
The voice band of the AF output signal from pin 1 of IC104:A is cut by sharp
active filter IC104:B and C (VCVS) and amplified, then led to pin 4 of CPU. The
input signal is compared with the programmed tone frequency code in the
CPU. The squelch will open when they match. During DCS, Q108 is ON, C156
is working and cut off frequency is lowered.
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