Yaesu IC-735 [15/149] Section 5 circuit description

Содержание

• General coverage receiver 1
• Hf all band transceiver 1
• Ic 735 1
• Service manual 1
• Foreword 2
• Table of contents 3
• 1 general 5
• 2 transmitter 5
• 3 receiver 5
• Section 1 specifications 5
• Specifications 5
• 1 installation recommendations 6
• 2 antenna 6
• 3 microphone 6
• 4 cw key 6
• Installation connections 6
• Section 2 installation and connections 6
• 5 powersupply 7
• 6 ground 7
• 1 linear amplifier 8
• 2 antenna tuner 8
• Section 3 system interconnections 8
• System interconnections 8
• 3 rtty terminal unit 9
• 4 sstv unit 10
• 5 transverter unit 10
• 6 receive antenna 10
• 7 rear panel connections 11
• 8 accessory socket 12
• Connections 12
• 1 ic ex243 electronic keyer unit 13
• 2 fl 32 fl 63 cw narrow filters 13
• Option installations 13
• Section 4 option installations 13
• 3 ut 30 tone encoder unit 14
• Circuit description 15
• Section 5 circuit description 15
• I i i i i i i i 19
• I i i i i i________ i jl 19
• Sensor and mic up down circuit 26
• C d q q 27
• I i i 0 o i latch 27
• O o o i i o i i 27
• Frequency range mhz 28
• Inj w1x 28
• Pd2834c 28
• Pd7225g 28
• Mm3 hasiii 29
• Ao ÿi fl 38
• Voltage circuit diagrams 38
• Иф1фгф 39
• 2 main unit 40
• Nod л sioiexs 42
• P p q p p p pp i 42
• Snos on 42
• 4 pa unit power amplifier 44
• 5 pa unit filter 45
• O o o o o o 45
• 1 preparation before servicing 47
• Maintenance adjustment 47
• Section 7 maintenance and adjustment 47
• 2 general adjustment 48
• Main unit 49
• Pll unit 51
• Pll unit 53
• Pa unit 56
• Transmitter adjustment 57
• Main unit 58
• Rear panel 59
• Transmitter adjustment 59
• Main unit 60
• 5 receiver adjustment 61
• Main unit 62
• 6 adjustment locations 63
• 7 lithium battery replacement 65
• 8 fuse replacement 65
• Section 8 troubleshooting 66
• Troubleshooting 66
• Inside views 68
• Sections insideviews 68
• Pll unit 69
• 3 pa unit power amplifier and filter 70
• 1 front panel disassembly 72
• Disassembly assembly diagrams 72
• Section 10 disassembly and assembly diagrams 72
• Front sub chassis connector assembly 75
• 4 main unit connector assembly 76
• 5 pl unit connector assembly 77
• 6 pa unit connector assembly 78
• Board layouts 79
• Front unit 79
• Sinoavl 0uv08 и noi1o3s 79
• Una inohd l kk 79
• 2 main unit 80
• 60 tts s 80
• C 62 g7 5 80
• Main unit 80
• O vi lw 80
• _ v rs 80
• 3 pll unit 82
• Pll unit 82
• Libero 83
• O j co 83
• Pa unit power amplifier 84
• Pa unit filter 85
• Ds2 o cd d51 u 86
• Sensor unit 86
• Block diagram 87
• Ic ratings 88
• Azpd7225g lcd controller driver 89
• Jpd4066bc 89
• Nd487c1 3r 90
• Azpc1037h double balanced modulator 91
• Mpc577h fm if amplifier 91
• Njm072082d 92
• Njm4558d dual low noise amp 92
• О u u u и 92
• Hd10551 pre scaler for digital tuning system 93
• Mpc1181h audio power amplifier 93
• M5218l dual audio amplifier 94
• Za78m08 94
• Ba222 monolithic timer 95
• Jpd4001bc 95
• H h h h 2 u h h 2 96
• Hd63a01v1 96
• Pd4069ubc 96
• A pd4021bc 97
• Maximum ratings 97
• Pin connection 97
• _zpd4510bc 97
• Üjldlijlljléjléjujlsj 97
• Dan401 high speed switching diode array 98
• Jpd82c43c 98
• 1pd2834c pll frequency synthesizer 99
• Mpb555c 99
• Uj lj l1j 111 lj l j izj id lu 99
• N n n n_n n_n 100
• Sn76514 circuit type balanced mixer 100
• U u u u u im 100
• Ua78m05c 100
• A pc1037h double balanced modulator 101
• Sn4ls90n decode counter 101
• At 15o 102
• Fl 32 cw narrow filter 500hz 6db 102
• Fl 63 cw narrow filter 250hz 6db 102
• Ic 2kl 102
• Ic at5oo 102
• Ic ex243 102
• Ic hp1 102
• Ic mb5 mobile mounting bracket 102
• Ic ps3o 102
• Ic sm6 desk microphone 102
• Ic sp3 external speaker 102
• Matching style and size with ic 735 102
• Optional units 102
• Section 14 optional units 102
• Sp 7 external speaker with matching style and size 102
• Ef unit front unit 103
• Parts list 103
• Section 15 parts list 103
• Front unit front unit 104
• Front unit main unit 105
• Main unit 105
• Main unit main unit 106
• Main unit main unit 107
• Main unit main unit 108
• Main unit main unit 109
• Main unit main unit 110
• Main unit main unit 111
• Main unit main unit 112
• Main unit main unit 113
• Main unit main unit 114
• Pl unit 114
• Pl unit pl unit 115
• Pl unit pl unit 116
• Pl unit pl unit 117
• Pl unit pl unit 118
• Pl unit pl unit 119
• Pl unit pl unit 120
• Pl unit pl unit 121
• Pa unit power amplifier 122
• Pl unit pa unit power amplifier 122
• Pa unit power amplifier pa unit power amplifier 123
• Unit filter 123
• Pa unit filter pa unit filter 124
• Pa unit filter 125
• Sensor unit 125
• 1 features 126
• 2 theory of operation 126
• Ci v communications interface system 126
• Foreword 126
• Section 16 icom cl v communication interface system 126
• 3 control code 128
• 4 collision detection 131
• 5 operation with the ic 735 131
• Code description 131
• 0 9600 132
• 1 if the transceive matrix is on and the displayed 132
• Changing the memo ch the ic 735 sends out the following data automatically 132
• During transceive operation db3 must be on the ic 735 comes factory preset for 1200 baud and the network address is 4 also available are 300 and 9600 baud each receiver connected to the icom cl v system requires its own unique address in the same way that individual houses have different addresses 132
• Example the example frequency is 14 23 5mhz 132
• Factory setting and standard cl v baud rate 132
• Frequency is changed by using the main dial the microphone up down function vfo a b or by 132
• I______________i 132
• T ransceive 132
• The baud rate can be selected by using db4 and db5 refer to the chart at left 132
• The ic 735 has the capability to handle the x 10mhz digit 132
• Through the x 10hz digit the display shows all digits except 10hz the 1hz digit is dummy data 132
• X 10hz x 10mhz 132
• I__________________ i 133
• I__________________ i 135
• I____________ i 136
• X10hz x 10mhz 136
• Schematic diagram 142
• A 0650a 146
• Jilcoml icom incorporated 146

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SECTION 5 CIRCUIT DESCRIPTION MAIN UNIT Interception 1 ATTENUATOR ATT RECEPTION BAND PASS the low pass filter in the input section is in the vicinity of FILTER BPF AND BAND SIGNAL DC AMPLIFIER Point characteristics The cut off frequency of 35MHz to prevent 70 MHz IF signal interference and avoid Receive signals enter from J15 pass through the attenuator 70MHz image frequency circuit RL1 approx 20dB and are fed into the various fre The transmit mixer uses two 3SK74 components to form a quencies As there are no non linear components between balanced mixer The output load is trimmed by resistors for the balanced output over a wide band band pass filters antenna corresponding connector and to the attenuator reception distortion of the various components caused by strong input signal levels is effectively prevented by the attenuation circuitry 4 70MHz BAND IF AMPLIFIER AND CRYSTAL FILTER The receive signals detected by the 70MHz band IF amplifier The signals passing through separated are amplified by approximately 15dB by the 1ST IF amplifier into those having a frequency above 1 6MHz and those with formed from FI1 and Q16 and are then passed into the 2ND a frequency below 1 6MHz The signals of powerful high mixer FI1 is a double 70 4515MHz MCF with amplifier Q16 frequency between broadcasting the stations attenuator are liable are to cause diode the two caused components by filter This insertion reduces any drop in switching distortion but if low distortion diodes are used sensitivity loss Q16providesagain signal loss in the higher bands around 28MHz will increase of approximately 18 to 20dB but this is reduced by 3 to 5dB This unit uses high pass filters together with low pass filters due to filter loss to create a diode switch less circuit preventing this type of The transmit signal passes through both FI1 components distortion and is amplified by Q8 and input to the transmit mixer after The signals between 1 6MHz and 30MHz are separated by a the 61 44MHz component is removed Q8 applies Automatic large series of band pass filters located at 5MHz intervals Level Control to the signal in order to prevent over input These band pass filters are based upon ICOM s exclusive distortion in the later stages high frequency band pass filters with improved band separation characteristics and a reduction in size by about 5 2nd MIXER 1 2 The bias voltage of the input output diode switches of The diode mixer IC1 is used for conversion of the 70MHz these band pass filters is designed to be high for signal input band IF signal and 9MHz IF signal A bi directional mixer and low for signal output This allows for a band pass filter with low distortion is required here as the input output signal which is resistant to multiple signals and strong input levels directions The band signals input from the PL UNIT are DC amplified diode mixer is designed to provide especially good balance by for IC2 BA618 switching the various band pass filters R 13 8V is used for the power supply of IC2 and there is complete isolation during transmission DBM for transmitting use and and local receiving signals are pass different through a This 3dB attenuator for OdBm input 6 NB CIRCUIT 2 PRE AMP AND MIC INPUT Pre amps Q12 for consisting of C39 L19 and C40 and unnecessary signals connected such as 61 44MHz are removed by the double tuned filters parallel to one another for better matching and to reduce the L69 and L70 Part of the receive signal taken from between impedance ratio with the output transformer Q11 isa switch L69 and L70 is amplified by IC3 and detected by D31 and for either selecting pre amplification or not D32 The threshold level of Q20 provided AGC detection of amplification and by Q13 The 9MHz band IF signal passes through the low pass filter use approximately the high 10dB loss They 2SK125 are 0 6V and controls the gain of IC3 after being DC amplified The MARKER input is located between the RF band pass by Q19 This operates as an averaging automatic gain filter and pre amp and uses a high frequency of 25kHz control by choosing the correct time constant for R66 R70 formed by division of the reference frequency of the PLL and C142 allowing for easier detection of pulse type noise Q21 switches Q22 in response to the detected pulses The 3 1ST LO AMPLIFIER TRANSMIT MIXER AND threshold level of Q21 is approximately 0 3V higher than RECEIVE MIXER Q20 and reduces improper operation with AM signals The 1ST LO output from the PL UNIT is connected to J12 Q4 Noise blanking is turned ON OFF by the emitter of Q21 amplifies this signal by approximately 26dBm after it passes When noise is detected and Q22 is turned ON the bias of the through a high pass filter It is then injected to the transmit balanced gate circuit formed from D26 27 28 and 29 is and receive mixers after its high frequency components are reversed and the signal line is switched OFF The signal removed gate remains OFF for the duration of the noise The NB level is capacitance of the receive mixer to create a match which controlled by the source voltage of Q18 and has a variable will allow for the full benefits of the band pass filters to be range of over 20dB by a low pass filter L5 cancels the realized The receive mixer uses two of the same 2SK125 components as the RF amplifier to form a high level mixer with high 5 1