Kenwood TR-7400A Service Manual Download Page 27 | Manualshive

Page: 27 / 46

background image

«
...
25
26
27
28
29
...
»

Summary of Contents for TR-7400A

Page 1: ......

Page 2: ...7400A is capable of transmitting or receiving F 3 F M signals on up t o 800 Chan nels at intervals of 5 kHz having 25W RF output power CONTENTS SPECIFICATIONS 3 FINAL TRANSISTOR SPECIFICATIONS 4 BLOCK DIAGRAM 5 CIRCUIT DESCRIPTION 6 PARTS ALIGNMENT 11 PC BOARD PA UNIT X45 1090 10 13 PD UNIT X50 1380 10 14 VCO UNIT X50 1370 10 15 INDICATOR UNIT X54 1210 10 16 RX UNIT X55 1150 10 17 TX UNIT X56 1230...

Page 3: ...quency Deviation k5 kHz Spurious Radiation Less than 60 dB Touch Tone Input Impedance 600 52 Microphone Dynamic microphone with PTT switch 500 52 RECEIVE SECTION Circuitry Intermediate Frequency Squelch Sensitivity Pass Band Width Selectivity 2 Signal Image Rejection Spurious Interference lntermodulation Audio Output OPTION i Tone Squelch Tone Deviation Encorder Response Frequency Stability Tone S...

Page 4: ... VCEO V 18 LTPD level Condition 5 5 F E Cob VEBO V 4 Minimum 1 1 VCE 5V IC 1A 5 5 1 VCB 1 5 V f 0 1 MHz 1 Standard value Maximum 5 Vcc 12 5 V POUT 30W 5 7 dB 10 1 f 175 MHz Vcc 12 5 V POUT 30W rl 1 65 10 1 f 175 MHz ICES V C E 15 V TC 55OC 10 mA 5 1 Ic A 4 Unit VCB 15 V ICBO 1 r nA BVCES Ic 15 mA V PD T A c W 65 BVCEO BVEBO Stud torque inIb 6 5 Ic 100 mA V Tstg c 65 to 200 IE 5 mA 4 V ...

Page 5: ... 1 7 1 9 1 9 1 5 1 I POWER SW TLR 313x6 J L DISPLAY UNIT X54 1210 10 13 8V DISPLAY UNIT X54 1210 10 r 1 I I DEC DRIVER I SN7447ANX 3 t 600 SWITCH BOARD BCD 400 799 I I VCO UNlT X50 r I l v l N 1 5 3 7 1 936 pw MC74416X3 zsc460 BUFF AMP I 2SC460 ZSC460 I A I I TX OFFSET LOGIC P D MC4044P l OkHz A I 1 2 56MHz 160kHz I R E F O S C l 2 1 16 1 16 1 1 5 UNIT T I TD3400 HTD3493 TD3493 2 7 3 3 50 1380 10 ...

Page 6: ...UNIT 50 1370 10 __ _ 1 I I I TX RX I MIXER I D I ...

Page 7: ...are mixed together and converted to 5 37 9 36 MHz signal and divided to 1 537 If936 with the programmable counter to obtain a 10 kHz output The phases between the 10 kHz output and another 10 kHz signal obtained by demultiplying 5 12 MHz REF OSC output to 11512 are compared And the phase difference if any is fed back to the VCO to lock it The stability of this function is determined by the LOCAL O...

Page 8: ...ient state before the VCO is locked though the indicator works This contributes to reduce noise PD UNlT X50 1380 10 0 6 serves as the interface and buffer amp for IC8 The waveform of its IF output is shaped in IC8 and its output frequency is divided to 10 kHz by the program mable counter consisting of IC5 t o 12 and the resulting signal is applied to MC4044P of IC4 While IC1 generates 5 12 MHz sig...

Page 9: ...ifts frequency by f600 kHz for repeater operation which is equivalent to the div sion ratio of 137 f 60 MC74416 is a decrement value is 5 and PE is 0 L level But output becomes 1 H level only when the count is 0 I t means that five input pulses make one out put pulse and the frequency is divided to 115 With three ICs connected in cascade the division ratio can be raised up to 999 IClO is a high sp...

Page 10: ...ipment is the so called CTCSS con tinc oc s tone controlled squelch system Tone signal of a certain frequency is superimposed with audio signal at the trans rlissionside which is separated at the reception side to drive the squelch circuit When set to SOU tone squelch as shown in Fig 5 a voltage is applied to TSBI and TSB2 When no signal is received or signal received does not have tone component ...

Page 11: ...pensation capacitors Voltages divided from common 9V C9 with R62 and 61 145 5 MHz VR61 144 5 MHz VR62 146 5 MHz and VR63 147 5 MHz and switched with the MHz switch are applied to D2 3 and 4 Parts number TBM 1800 TBM 1950 TBM 2000 TBM 2100 TBM 2150 TBM 2200 TBM 2250 TBM 2400 TBM 2550 FINAL CIRCUIT The output of the TX unit iabout 1 4 W 50 ohm load is amplified to about 10 W 50 ohm load by 0 1 of th...

Page 12: ...r E07 0251 05 Case A A01 0703 22 PARTS ALIGNMENT LED LED 838 0302 05 838 0301 05 Knob M A I N K21 0705 04 1 sub panel Knob 5 kHz Knob TX OFFSET A22 0701 03 K29 0702 04 K23 0702 04 Mounting bracket Mounting rail Earphone jack stopper J90 0045 04 E11 0003 15 J51 0006 15 I I I 4P socket E08 047 1 05 Heat sink F 20 0502 05 I ...

Page 13: ... X56 1230 10 RF meter ADJ I I I V A V R Tone burst time ADJ I I Tone oscillator module PA UNlT option X45 1090 10 VCO UNIT RX UNIT X50 1370 10 X55 1150 10 Center meter point I I s meter ADJ I I TON UNIT I rotecti6n ADJ I loption SWITCH BOARD Tone dev ADJ Herical resonator ...

Page 14: ...V PA UNIT X45 1090 10 G C PC BOARD ...

Page 15: ...TD3493BP IC4 MC4044P IC5 7 MC74416P IClO TD3474AP IC11 TD3410AP IC12 TD3420AP Dl 3 1S1555 TD3400AP TD3474AP 2SC460 B 2SC733 Y TD3410AP TD3493EP 2SC458 B 2SA495 Y1 TD3420AP MC4044P MC74416P i l f i B B 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 r PC BOARD FOR SWITCH 525 2506 131 PC BOARD FOR CHOKE 525 2507 041 C9 ...

Page 16: ...PC BOARD V VCO UNIT X50 1370 10 2SC733 Y 2SC785 1Yi ...

Page 17: ...C j PC BOARD INDICATOR UNIT X54 1210 10 LOCK INDICATOR IClW3 SN7447AN DlW6 TLR 313 C D ...

Page 18: ... 0 zG N 2 4 3 g M co n C o h n am L O L O a L O rn E h 2 0 g 0 g z 7 O r 95 hlF n 0 h CC Lo g w L n r a Lo Efl 7 44h 7 E m d g r O 0 n m c i O n b g L LT G K a h a O 2 yJ 0 7 3 sb L n 0 m h 2 aa rn 2 K G 5 2 h l r h l a a a ...

Page 19: ...PC BOARD TX UNIT X56 1230 10 1r O cj 0 g d 8 V C LC 2 ...

Page 20: ... m cushion L o w e r Protection coyer Polyethylene bag 6 0 x 1 1 0 m m Polyethylene bag 2 0 0 x 2 0 0 m m Polyethylene bag 1 2 5 x 2 5 0 m m VR61 63 R I P 3 0 2 5 0 5 Semi fixed resistor 1 0 k R VR101 102 R19 9401 05 Variable resistor I I 571 7 2 5 1 0 2 S 1 0 3 R L l O l SWlTCHlRELAY Rotary switch MHz Lever switch T X O F F S E T Push switch 5 k H z Rotary switch T O N E Push switch H I L O W Pus...

Page 21: ...f 5 1 2W Carbon 6 8 k a 5 1 4W POTENTIOMETER 0 4 0 1 0 9 1 5 E06 0251 05 E22 0207 05 2 3 0 0 1 5 0 4 E23 0046 04 V R 1 V R 2 V R 3 T C 1 TC2 4 E23 0047 04 Terminal E30 0234 15 Lead wire F20 0078 05 l nsulating plate 1F20 0502 05 1Heat sink i 32 0703 14 Hexagonal boss x 5 Vco UNIT X50 1370 10 M t y p e connector 2P connector jack L u g Earth lug x 2 Terminal x 1 2 R 12 5024 05 R 12 0042 05 R12 2015...

Page 22: ...32J Carbon 3 3k52 RD14CY2B561J Carbon 56052 RD14CY2B152J Carbon 1 5k52 RD14CY2B473J Carbon 4 7 k a RD14CYZB273J Carbon 2 7 k a RD14CYZB333J Carbon 33k52 R D 1 4 C Y Z B l O l J Carbon 10052 POTENTIOMETER R 12 1020 05 Semi fixed resistor 1 Ferri inductor Ferri inductor Tuning coil for 135 MHz Ferri inductor OSC coil for VCO Ferri inductor Choke coil 0 47pH OSC coil for 4 2 M H z Tuning coil for 1 3...

Page 23: ... l A 4 7 0 C K 4 5 F 1 H103Z C E 0 4 W l C 1 0 0 SEMICONDUCTOR Re marks Description Carbon 4 7kCl f 5 1 8W Carbon 1 8 k n f 5 1 8W Carbon 3 3 0 n 5 1 8W Carbon l O k n i 5 1 8W Carbon 1 5 0 n 5 1 8W Carbon 8 2 0 n 5 1 8W Carbon 1 0 k n f 5 1 8W Q1 2 Q 3 Q 4 Q5 Q 6 IC1 IC2 3 I C 4 IC5 7 IC8 9 l C l 0 l C l I IC12 D l 3 Mylar 0 022pF 10 Ceramic 220pF f 10 Mylar lOOOpF f 10 Mylar 0 047pF 10 Mylar 0 0...

Page 24: ...istor 5 0 k a VR2 3 R12 3025 05 Semi fixed resistor 1 0 k a SEMICONDUCTOR Description Electrolytic 47pF I O W V Ceramic O 01pF 80 20 Electrolytic 0 47pF 50WV Ceramic O 01pF 80 20 Electrolytic 10pF 16WV Electrolytic I M F 5 0 W V Ceramic IOOpF 10 RESISTOR Carbon 1 0 0 k f l f 5 1 4W Carbon 8 2 k a 5 1 4W Carbon 1 0 0 a 5 1 4W 1 5 0 a 5 1 4W Carbon 1 0 0 k a 5 1 4W Carbon 47 0 5 1 4W Carbon 1 0 0 a ...

Page 25: ...O 20 2 5 W V I OWV 0 5pF 50WV R 1 1 TX UNIT X56 1230 10 R 1 2 R 1 3 l o f 10 f 10 f 5 f 0 5 p F f 10 f 5 SO 20 f 5 2 0 f 5 5 80 20 f 5 f O 5pF f0 25pF f 5 f 0 25pF f 5 5 SO 20 I O W V F01 0150 14 F07 0313 14 F20 0078 05 F29 0014 05 Ref No CQ92M1 H 1 0 3 K CQ92M1 H 3 9 3 K CQ92M1 H 4 7 3 K CC45CH 1H330J C C 4 5 U J l H 0 5 0 D CC45SL1 H Z 2 1 K CC45CH 1H 2 2 0 J C K 4 5 F 1 H 1 0 3 Z CC45CH1 H 3 3 ...

Page 26: ...l 3 4 T V H F c o i l 6 4 T Choke coil w i t h 100Sl V H F coil 3 6 6 T a ACCESSORIES SUPPLlED J1 I 1 Dynamic microphone equipped with 4 pin plug T91 0302 05 1 piece 2 Mounting bracket J21 0941 02 1 piece 3 Mounting parts Screws 6mm diameter N09 0008 04 4 pieces Plain washers 6mm diameter N15 1060 46 4 pieces Spring washers 6mm diameter N16 0060 41 4 pieces Nuts 6mm diameter N14 0009 04 4 pieces 4...

Page 27: ...7031 2 I om Bind screw N35 3006 45 Case B I 0 1 0 7 0 4 1 2 8 Fig 6 Removing the Case REMOVING THE PANEL Refer to Fig 7 1 Remove the knobs Remove the screws Remove the panel and the subpanel In fact this board is constructed with Panel A20 2301 05 Knob SQU K21 0703 04 Knob VOL K 21 0704 04 Fig 7 Removing the Panel ...

Page 28: ...ER MHz 0 0 1 600 0 600 Front glass 810 0601 04 REMOVING THE FINAL SECTION Refer to Fig 9 Fig 8 Removing the Indicator 0 REMOVING THE TX UNIT Refer to Fig 10 1 Rernove the leads and from the terminal pins 1 Remove the leads and from terminal pins 2 Remove the screws W 2 Remove the screws 0 0 3 Pull F nal section out 3 Lift TX unit up in the direction of arrow OUT N88 3006 46 x 4 Fig 9 Removing the ...

Page 29: ...ssernblying the Sub Panel TO REMOVING LED MOTHER BOARD 1 Remove knobs and front panel 2 Loosen SQIVOL control knob 3 Remove all LED display 4 Remove 4 screws on each corner of mother board J25 2513 03 5 Remove 2 connectors on board 6 Gently push to rear and lift up ...

Page 30: ...C1 shifted TC4 shifted Crystal or IC1 broken IC2 3 broken IC4 MC4044P or IC5 12 broken Measures Remedy Checkvottage and replace trans former Check voltage and replace trans former coil Check voltages etc Check voltages and replace L16 17 crystal Check voltayes Check voltages and replace L1 crystal Check voltages Check voltages and replace de fective parts Adjust it Adjust it Check waveform and fre...

Page 31: ...nt 7 Large spurious A For near by spurious lmproper adjustment for L7 L8 in TX unit lmproper adjutsment for L11 L14 and VR3 in TX unit lmproper adjustment for VR61 VR63 in main body choke printed circuit board B For harmonics spurious lmproper adjustment for TC1 TC4 in PA unit Readjustment Readjustment Readjustment Readjustment Replacement Check Replacement 6 8 Transmitlreceive change Microswitch ...

Page 32: ...ctor with lead wire of display printed circuit board No fuse in fuse holder Disconnection or improper soldering in power cable Power switch broken Power circuit connected reversely Meter defective Improper adjustment for VR1 for meter sensitivity adjustment 10 245 MHz L11 crystal defective Each TR defective in receiver RF and IF stages Improper adjustment for each coil in receiver RF and IF stages...

Page 33: ...b TRANSMITTER SECTION B LEVEL DIAGRP I i 0 3 RX I 0 5 TX A I I I 1OOmV I 0 02 pF Audio section 1pF I To rnea fc 146 0 M H z fs 1 k H z MODE r 5 k z DEV 80 1oopv 7 ...

Page 34: ... 6 7 i t z I HI RECEIVER SECTION DISC I F A F 1 1 455 MHz 1 1 1 kHz 1 M 50 rnW L I I PF I I I I 1 I i Y easurernent polnt I 0 i I 1I I i I i I I I I I i I J 1 i I I I I I i I L O C A L OSC L E V E L 146 MHz L R 0 7 V TP2 0 9 V r ...

Page 35: ...PA UNlT X45 1090 10 RX UNlT X55 1150 10 V R 2 V R 3 filter e F r o n t panel PA UNlT X45 1090 10 TX UNlT X56 1230 10 V R 5 VR3 IPD UNlT 1x50 1380 10 X54 1210 10 Front panel ...

Page 36: ...nge 9 V 16 V Current range 10A or more d 12 Sweep Generator Center frequency 145 WlHz Frequency deviation Maximum t 5 kHz Output voltage More than 0 1 V Sweep rate A t least 0 5 sec cm 13 Center Meter Input sensitivity 50 pV or so 14 Detector Construct the following circuit 22P lN OUT I Fig 12 Detector ADJUSTMENT OF THE TR 7400A 1 ADJUSTMENT OF PLL 1 1 Test Equipment Used 1 RF VTVlM 2 Frequency co...

Page 37: ...oltage at TP2 of RX unit 0 8 1 2 V I V R l 111 L5 L3 1 T P l I RX Unit 1 4 Check Point 1 Unlock circuit and its indicator A When TPI of VCO unit X50 1370 10 is grounded with controls set arbitrarily a The unlock indicator on the panel should light b The RF voltage at TP2 of the RX unit X55 1150 10 should be attenuated by 20 dB or more B When the MHz control is turned rapidly the un lock indicator ...

Page 38: ...enter meter to terminal CM Adjust L14 alone so that the center meter indicates 0 SSG TP1 Detector D u m m y t load Fig 15 Sensitivity Adjustment 2 5 Squelch Adjustment 1 Set the SOU knob at the II o clock position and without receiving any signal adjust VR2 of the RX unit so that reception noise just diminishes by turn ing it in the diminishing direction 2 When a signal of 6 dB is applied from the...

Page 39: ...ximum indication 2 Set the frequency to 144 5 MHz and adjust VR6l on the choke circuit board for maximum indication 3 Set the frequency to 146 5 MHz and adjust VR62 for maximum indication 4 Set the frequency to 147 5 MHz and adjust VR63 for maxlmum indication 3 4 Adjustment of Predrive 1 Set the frequency to 146 0 MHz and connect the power meter to the OUT terminal of the TX unit 50 ohms 2 Adjust ...

Page 40: ... 9 MHz and the Hi Low switch to Low Adjust VR5 of the TX unit so that the power meter indicate 9 0 W 2 Adjust VR1 of the display unit so that the power meter indicate 9 0 W at the frequency of 144 0 MHz with the HiILow switch set at Low 3 The power should be 8 15 W at Low position in between 144 0 and 148 0 NIHz 3 9 Adjustment of DEV Deviation switch to SQ adjust VR3 of the RX unit so that DEV bec...

Page 41: ... DUMMY ANT IMP 50f2 1 3 5 10 100 MIC INPUT LEVEL IN rnV Example 2 RX SIGNAL TO NOISE RATIO OUTPUT LEVEL VS ANTENNA INPUT VOLTAGE Example 3 RX S METER SENSITIVITY 10 a 144 00 MHz x 146 00 MHz 9 0 0147 99 MHz 8 ru 7 I Q 0 6 V 3 2 1 0 10 p v 100 p v ANTENNA INPUT VOLTAGE ...

Page 42: ...SCHEMATIC DIAGRAM ...

Page 43: ...SCHEMATIC DIAGRA ...

Page 44: ...FS 7805 OUTPUT INPUT 2SC496 IY 0 1 A496 IY 0 1 ...

Page 45: ...rystal for 0 kHz Lock Error Control Terminal No 1 Control Terminal No 2 TX Switching RX Switching MIC Amp Output Common 9 V Common B Line Tone Burst B Line Touch Tone Input TX B Line TX Lamp on a r Base o C Transistor Protection Stabilized B Line Voltage Control Tuning Stand by S Meter Speaker RX Antenna Squelch B Line Tone Squelch B Line TX Switching TX 10 Volt L n e RX Switching Center Meter Ton...

Page 46: ......

Reviews:

No comments

Related manuals for TR-7400A

Brand: Harris Pages: 162

Brand: Nautel Pages: 83

Brand: Yamaha Pages: 155

Brand: Vaisala Pages: 20

JLT-6000 series

Brand: Jogler Pages: 16

Brand: Tivoli Audio Pages: 6

Brand: Lectrosonics Pages: 24

Efector 600 TADx91 Series

Brand: IFM Electronic Pages: 25

Brand: JETStream Pages: 62

FT DX 9000 - CAT OPERATION REFERENCE BOOK

Brand: Yaesu Pages: 20

Brand: Yanglousi Technology Pages: 3

Brand: Topfield Pages: 16

Brand: National Pages: 25

Brand: TRUEYES Pages: 11

FMT 380 BT CHARGE

Brand: Hyundai Pages: 24

TECHCONNECT TC2-HDMIW20

Brand: Vision Pages: 16

Brand: M-system Pages: 2

HD-RX-4K-x10-C-E

Brand: Crestron Pages: 56

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands