Yaesu IC-735 Сервис мануал онлайн [18/149] 209392

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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squelching Pins 2 3 and 9 on the output side of the analog switch are all fed into the AF pre amplifier Q55 In the FM mode a portion of the output signals is fed into the IC11 filter amplifier and noise rectified by D102 The noise voltage is inverted and amplified by IC12 and the offset is adjusted by R224 so that the level is low when there is no input and high when there is an input signal The output of IC12 is passed into the comparator simultaneously with the S meter output voltage at D101 for noise squelch This is an S meter squelch at levels causing large deflections in the S meter thus for multi mode scanning the squelch level can be constantly set to the same value The dynamic range of the S meter for FM is the same as deflection for other modes 16 AF AMPLIFIER After the squelch output passes through the Q55 pre amplifier it is fed into the AF GAIN CONTROL potentiometer on the front panel The AF GAIN CONTROL is located between IC14 and Q55 This means that lowering the variable resistor will reduce the noise down to the level of IC14 and increasing the control setting will provide for sufficient volume The tone control in the input section of IC14 allows for the high range of the audio frequency to be increased or attenuated There is a hole in the bottom coverforthe userto set this control to the desired tone level 17 SSB AND AM MODULATOR ICS is as double balanced mixer IC Carrier suppression of at least 70dB in relation to the saturation output of the IC is possible by external fine tuning of the carrier balance SSB signals are generated by taking a single side band of the DSB output signal of IC6 at FI3 AM signals are not filtered and are generated by disrupting the balance of D6 to allow a carrier to be injected into the DSB signals 18 FM MODULATOR A modulation signal is applied to the anode of D75 in the BFO circuit for direct FM modulation After the amplitude of the modulation signal is limited by the IC7 IDC circuit R130 regulates the signal for maximum deviation of less than 5kHz A subaudible tone input circuit for a repeater is installed at pin 6 of IC7 Modulation of the subaudible tone is set by R131 The subaudible tone is linked to the FM MODE SWITCH and is only modulated while the FM MODE SWITCH is pressed 19 CW KEY CIRCUIT SIDE TONE The CW key is connected to R296 the base resistor of Q61 and the output of Q61 is 8V when the key is pressed This key ON voltage of 8V is applied to the break in circuit through D117 and is used for side tone control and oscillation control of the BFO Q42 is OFF when the key is released during CW transmission This turns 041 ON turning Q39 OFF and stopping oscillation When the key is pressed ON Q42 goes ON 041 goes OFF Q39 goes ON and the BFO starts oscillation Side tone oscillation of approximately 800Hz occurs only while the key is pressed ON The leading and trailing edges of the waveforms are sloped to eliminate clicking of the monitor sounds The gate level of IC13 is switched so that the monitor sounds for received signals are louder than during transmission or when the squelch is closed This side tone passes into the AF pre amplifier allowing for the volume to be adjusted with the AF GAIN CONTROL on the front panel R230 can be used for presetting the volume to its normal level allowing this volume to be adjusted in the same manner as the AF tone 20 VOX BREAK IN CIRCUIT A portioo of the microphone input passes through the pre amplifier in the PL UNIT and is passed into the IC17 VOX comparator after the level is controlled by the VOX CONTROL in the switch panel When there is audio input there is output from pin 1 Q59 is switched and C308 is charged Q62 is switched OFF and the receive mode is selected when the discharge voltage from R292 and the delay variable resistor is less than approximately 4V The transmit mode is selected when the discharge voltage is less than approximately 4V Speaker output passes into pin 5 of IC17 which functions as an anti VOX amplifier The anti VOX output from D115 turns ON Q58 preventing VOX operation The 8V key ON voltage output of Q61 passes through D117 before being applied to the base of Q60 Q62 is turned ON to activate the break in function The current flows to C309 in the semi break in mode to retain the transmit state temporarily C309 is cut off in the break in mode and Q62 drives the SEND line with the same timing as the key operation Refer to the timing diagram on page 5 5 21 TRANSMISSION IF AMPLIFIER 9MHz BAND 023 is the transmit amplifier and R361 is a variable resistor for adjusting the total gain for transmitting ALC with a slow time constant is applied to Q23 to increase the dynamic range for ALC The thermistor between the 023 output coil L75 and the mixer to the 70MHz band provides temperature correction to limit fluctuations in the transmit gain caused by changes in the surrounding temperature 22 RF AND SWR CIRCUIT The FOR and REF voltage detected on the FILTER UNIT are fed into the MAIN UNIT from J3 IC15 is a non inverting amplifier which receives input voltage at high impedance and amplifies it by approximately two The output series resistor was selected so that the meter is full scale for approximately 35 40W at the S2 SET position D107 and C293 comprise a hold circuit to keep the meter deflection for SSB near the peak value R250 is set so that the meter is not overdeflected at the S2 PO position 23 ALC AND APC CIRCUITS The FOR voltage applied to pin 2 of IC16 is compared with the voltage level at pin 3 and amplified to generate the ALC voltage R274 is the resistor for ALC attack C300 is the capacitor for hold and R275 is the resistor for release The ALC voltage input to pin 6 of IC16 is inverted and amplified 5 4