Kenwood TM-321A Service Manual Download Page 1

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Summary of Contents for TM-321A

Page 1: ...CSS UNIT SPECIFICATIONS 40 40 40 40 41 42 44 45 49 50 51 52 BACK COVER 13 16 30 31 32 33 39 39 39 40 220MHz FM TRANSCEIVER KENWOOD TM 821A SERVICE MANUAL C 1987 8 PRINTED IN JAPAN B51 3305 00 O 1196 Knob Button K29 3058 04 Metallic cabinet Upper A01 1021 03 BRY an Frelds Knob Button K27 0496 04 x2 BRYond Panel ass y Knob VOL SQL Microphone A20 2629 02 K29 3061 04 x2 T91 0359 05 VFO M M N MHz vou L...

Page 2: ...t this defeats the point of capturing this at high resolution If something is incorrect here or unreadable please reach out I likely have the original lossless compressed images In the final PDF that s color or grayscale will be JPEG 2000 format with highest quality selected B W images will be compressed using CCITT Group 4 This is quite close to the source material but there may be some artifacts...

Page 3: ... Receiver system General incoming signals from the antenna pass through a low pass filter in the Transmitter Final unit and a diode trans mit receive switch then enter the receiver front end After passing through two antenna coils the signals are amplified by a GaAs galium arsenide FET Q1 3SK184 S Undesired signals are removed by a 3 pole helical res onator L3 The resulting signal is applied to th...

Page 4: ...d attenuation 35dB or less within 4554100kHz 1 0 impedance 2 0k2 sa then ay b oro an seu ao eo eu oz TM 321A TM 321A CIRCUIT DESCRIPTION CIRCUIT DESCRIPTION a with PLL DT and CK lines a The first IF signal is amplified by Q3 2SC2714 Y ey 6 and fed to a special narrow FM IC TA7761F Here the 7 signal is mixed with the 30 370MHz frequency from the 4 second local oscillator to produce the 455kHz secon...

Page 5: ...input from Control unit Fig 5 PLL IC M54959P block diagram To8T TosR control control circuit circuit TM 321A TM 321A CIRCUIT DESCRIPTION Transmitter system General In the transmitter system the desired frequency is pro duced directly by an oscillator Frequency modulation is obtained directly thru the use of a varactor diode Modulation circuit Audio signals from the microphone are applied to a thre...

Page 6: ...1 and Q2 in the module unit drive unit turn OFF The result is that during receive Q17 is OFF and during transmit Q4 and Q5 in the module unit are OFF This halts trans mit preventing unwanted radiation from the antenna See Fig 6 PLL LOCKED Sw in transmit mode OV when PLL is unlocked 01 in transmit mode Qi W 2 RS R7 R17 on a cog LTT Q2 Q4 R3 Re C10 cs Q5 8T Sw QUT wo sw 11 j 10 ae 4 3 2 1 a FROM PLL...

Page 7: ... S meter analog input 1 2 3 38 4 5 6 7 8 54 Table 4 uPD75106G 508 1B pin assignments Control unit 1C3 321A CIRCUIT DESCRIPTION Digital control unit General The control unit consists of a microprocessor input keys peripheral circuits and a display The single micro processor 1C3 controls all transceiver functions The pin assignments of the microprocessor are listed on the Table 4 Keys and rotary enc...

Page 8: ...1 fosc s12 SEC VLCD Fig 9 LCD driver common and segment output signals Fig 8 LCD ass y B38 0303 05 9 TM 32 CIRCUIT DESCRIPTION Display circuit according to serial data sent from pins P71 to P73 of the Located in the LCD assembly Fig 8 the display microprocessor to the LCD driver Fig 9 shows the circuit consists of the LCD driver its peripheral circuits common output and segment output signals of t...

Page 9: ...n 2 bits Data Output port D3 D4 SW1 sw2 H RX mode H L L L H L H TX mode Fig 12 PLL data configuration 321A CIRCUIT DESCRIPTION Reset backup circuit Fig 10 shows the reset backup circuit When the transceiver is turned ON 3 0V is applied at the INT4 pin causing C3 to enter the backup mode Ci6 C2 timing chart Pin 1 Pin 3 Fig 10 Reset and backup circuit 10 PLL data output PLL data is supplied from pin...

Page 10: ... 7 20K 1 P40 Fig 15 Internal configuration of KRR C001 ladder resistance network Control unit 1C4 11 TM 321A CIRCUIT DESCRIPTION Alert and electronic volume control output when optional remote controller is connected The alert and electronic volume control outputs are provided by pins P92 CK P91 DT and P21 ST of the microprocessor to the 8 bit shift register IC3 in the TX RX unit P92 CK and P91 DT...

Page 11: ...IN CR CE SW15 6 C T counter UP DN 4to16 decoder sw osc 10 swo Reset UP 11 DN 9 69 3 VM 15 VDD VSS 12 321A SEMICONDUCTOR DATA Electronic volume LC7532M VOL IC1 Electric characteristics Item Symbol Conditions Specifications Unit Min Typ Max VDD 3V RL 50kQ2 THD1 f 1kHz VR MAX 0 1 0 5 VIN 20dBV High frequency distortion VDD 2 1V RL 50kQ THD2 f 1kHz VR MAX 0 3 1 0 VIN 20dBV Output in low power mode X O...

Page 12: ...l required for input to the final unit power module Q20 B DB AVR of Q19 Operates in transmit mode 13 TM 321A DESCRIPTION OF ELEMENTS FINAL UNIT X45 1360 11 Function Element Description Qi Power amplifier Boosts power to the required level M57774 D1 Protection against reverse power connection D2 D3 Transmit receive select ON during transmit D4 High frequency output voltage level detect Detects high...

Page 13: ...utput first stage IC1 fier quadrature detector noise amplifier Detector output First tF signal input 321A 14 DESCRIPTION OF ELEMENTS Element Function Description Q21 High pass filter Improves AF frequency characteristics in the receive mode D1 Limiting Limits the first IF signal D2 Reversal current protection Turns on the SQ circuit and 04 for AL in transmit mode for muting of the AF line D3 Rever...

Page 14: ...ntrol Q2 Switching ON to decrease by 1 step Q3 Switching ON to increase by 1 step D1 Voltage drop 15 TM 32 DESCRIPTION OF ELEMENTS SQL X59 3150 00 Element Function Description Qi Noise amplifier Q2 Squelch switching ON when squeltch is on Q3 04 DC amplifier OFF when squelch is on Q5 Low frequency amptitier For RD terminal 06 Low frequency amplifier OFF when squelch is on D1 Squelch noise rectifier...

Page 15: ...0 2 0 45 2A Cord Wattage Cord Wattage Cord Wattage 2A 1 i0W 2E 1 4w 3A 1w 28 1 BW 2H 1 2W 3D 2c 1 6W 321A 16 PARTS LIST CAPACITORS CC 45 TH 1H 220 J CC45 Color Capacitor value 1 0 3 0 01uF 5 6 0 1 O 1pF 2 2 0 22pF 1 Type ceramic electrolytic etc 4 Voltage rating 1 0 0 10pF 2 Shape round square etc 5 Value 1st number Multiplier 3 Temp coefficient 6 Tolerance 1 0 1 100pF 2nd number 1 0 2 1000pF 0 00...

Page 16: ...t Hawaii T England M Other Areas 17 UE AAFES Europe X Australia indicates safety critical components TM 32 New Parts PARTS LIST Parts without Parts No are not supplied Les articles non mentionnes dans le Parts No ne sont pas fournis Telie onne Parts No werden nicht gellefert Ref No Address New Parts No Description Desti Re Parts nation marks oR ES M g oh 4 TM 321A 1B AGiI1021 03 METALLIC CABINET U...

Page 17: ...ast Hawaii T England M Other Areas VE AAFES Europe X Australia A indicates safety critical components 321A 18 New Parts PARTS LIST Parts without Parts No are not supplied Les articies non mentionnes dans le Parts No ne sont pas fournis Telle ohne Parts No werden nicht geliefert Ref No Address New Parts No Description Desti Re Parts nation marks MES fi Bh ESA ER b K29 3057 14 KNOB RING 7 3D N99 031...

Page 18: ...Hawaii T England M Other Areas UE AAFES Europe X Australia A indicates safety critical components 19 TM 321A New Parts PARTS L IST Parts without Parts No are not supplied Les articles non mentionnes dans le Parts No née sont pas fournis Telle ohne Parts No werden nicht gellefert Ref No Address New Parts No Description Desti Re nation marks 519 h eye Di DSA3AI DIODE De MI40 DIQDE D3 MI308 DINDE D4 ...

Page 19: ...ast Hawaii T England M Other Areas UE AAFES Europe X Australia A indicates safety critical components 321A 20 New Parts PARTS LIST Parts without Parts No are not supplied Les articles non mentionnes dans le Parts No ne sont pas fournis Telle ohne Parts No werden nicht geliefert E Scandinavia Europe K USA P Canada W Europe U PX Far East Hawaii T England M Other Areas UE AAFES Europe X Australia A i...

Page 20: ...t Hawaii T England M Other Areas UE AAFES Europe X Australia indicates safety critical components 21 TM 321A New Parts PARTS LIST Parts without Parts No are not supplied Les articles non mentionnes dans le Parts No ne sont pas fournis Telle ohne Parts No werden nicht geliefert Ref No Address New Parts No Description Desti Re nation marks omes fi Bh BSR C78 COPSFCHIHI20J CHIP C 12PF Cr CKT3FBIH103K...

Page 21: ...ast Hawaii T England M Other Areas UE AAFES Europe X Australia A indicates safety critical components 321A 22 New Parts PARTS LIST Parts without Parts No are not supplied Les articles non mentionnes dans le Parts No ne sont pas fournis Telle onne Parts No werden nicht gellefert Address New Ref No Parts No Description Desti Re nation marks gmas ft L4 L34 2265 05 CNIL L5 L34 2157 05 CAT L6 L 1 0270 ...

Page 22: ...Hawaii T England M Other Areas 23 UE AAFES Europe X Australia A indicates safety critical components TM 3 New Parts PARTS LIST Parts without Parts No are not suppiled Les articles non mentionnes dans le Parts No ne sont pas fournis Telle ohne Parts No werden nicht gellefert Ref No Address New Parts No Description Desti Re nation marks omes a a R39 RD4 1FB2B102J CYLND CHIP 1 OK J 1 8W R40 RD41FBeB1...

Page 23: ...st Hawaii T England M Other Areas UE AAFES Europe X Australia A indicates safety critical components 321A 24 New Parts PARTS LIST Parts without Parts No are not supplied Les articles non mentlonnes dans le Parts No ne sont pas fournis Telle onne Parts No werden nicht gellefert Address New Desti Ref No Parts No Description nation marks Re Baeseae as smae u s S825 R12 RD41FB2B4 710 CYLND CHIP 470 J ...

Page 24: ...es safety critical components 25 UE AAFES Europe x Australia indicates safety critical components 26 TM 321A TM 321A New Parts PARTS LI ST New Parts PARTS LIST Parts without Parts No are not suppiled Parts without Parts No are not suppiled Les articles non mentlonnes dans le Parts No ne sont pas fournis Les articles non mentionnes dans le Parts No ne sont pas fournis Telle onne Parts No werden nic...

Page 25: ...es safety critical components 28 UE AAFES Europe Australia A indicates safety critical components 27 TM 321A TM 321A PARTS LIST xe Now Perts PARTS LIST New Parts Parts without Parts No are not supplied Parts without Parts No are not suppiled Les articles non mentionnes dans le Parts No ne sont pas fournis Les articles non mentionnes dans te Parts No ne sont pas fournis Telle ohne Parts No werden n...

Page 26: ...32M LC7582 M51951BML M54959P MC7808C MN4066BS NJM4558M TA7761F TC4094BP uPC1241H uPD75106G 522 1B 29 TM 32 PARTS LIST SEMICONDUCTOR N New parts Re item marks Parts No Diode 151587 BA282 DSA3A1 MI308 MI407 Chip diode 1 S181 155184 195187 1 S226 Chip zener 02CZ6 2 Y Z diode Chip vari cap 1SV 164 diode 1SV166 Thermister 112 502 2 TR 2SC3369 28D1406 Y Chip TR 2SA1162 Y 2SB1119S 28C2712 Y 28C2714 Y 28C...

Page 27: ...EXPLODED VIEW 30 Parts with the exploded numbers larger than 700 are not supplied EXPLODED VIEW 30 Parts with the exploded numbers larger than 700 are not supplied ...

Page 28: ...ection bag Radio H25 0720 04 1 2 Parts with the exploded numbers larger than 700 are not supplied 31 TM32 PACKING I5 I6 Accessary Warranty card B46 0410 20 Instruction manual B50 8182 00 DC cord ass y E30 2053 05 Fuse 8A F05 8021 05 MIC hook J20 0319 24 Mounting handware x 2 J21 4147 14 Mounting bracket J29 0416 03 Screw set N99 0318 05 Flat washer x 4 Tapping screw x 4 Hex semuse screw x 4 54 Pan...

Page 29: ... Spacer ring Mic connector nut Case Lower Frame A e Lithium Soldering battery QS iron Soldering iron 321A 32 DISSASSEMBLY Replacement of Lithium Battery 1 Remove the eight screws from the upper and lower case Loosen the four screws on the left and right panel and remove the upper and lower case 2 Release the stoppers fixing the front panel and sub panel and remove the front panel 3 Pull out the ma...

Page 30: ...CTCSS TONE E reeds 28 BUSY OODEOORO0oOUOU on air saL S RF OVER SHIFT REV SCAN cTcss TONE 3 Fig 19 33 TM 321A ADJUSTMENT REQUIRED TEST EQUIPMENT 1 2 12 13 14 DC V M 1 High input impedance RF VTVM RF V M 1 Input impedance 1MS min 2pF max 2 Voltage range F S 10mV 300V 3 Frequency range Up to 450MHz 3 Frequency Counter f counter 1 Input sensitivity Approx 50mV 2 Frequency range Up to 450MHz 4 DC Power...

Page 31: ...rn the VR8 MOD 1kHz 82 counter clockwise to the DEV 3kHz dummy point at which squelch just load opens 321A ADJUSTMENT COMMON ADJUSTMENT Measurement Adjustment Item Condition Test Specification Remarks equipment Unit Terminal Unit Part Method 1 Setting 1 Power supply 13 8V DC Power SW OFF VOL VR Fully counter clockwise CCW SQL VR Fully counter clockwise CCW VR6 on TX RX unit Fully counter clock wis...

Page 32: ...Power Filter 25kHz 15kHz De emphasis OFF De emphasis OFF meter TX RX VR2 3kHz 200Hz 2 AG 1kHz 5mV 3C TM 32 ADJUSTMENT Measurement Adjustment Item Condition Test Specification Remarks equipment Unit Terminal Unit Part Method 5 Sensitivity 1 FREQ 222 520 AF VM Rear SP Check SINAD 12dB or more Oscillo panel 18 SSG output 9dBu scope 2 FREQ 220 020 82 3 FREQ 224 960 dummy toad 6 S meter 1 FREQ 222 520 ...

Page 33: ...control memory or the Microphone UP channels DOWN switch as described in Item 4 1 bad ud bed heed 36 TM 321A ADJUSTMENT Measurement Adjustment Item Condition Test Specification Remarks equipment Unit Terminal Unit Part Method 4 Protection 1 FREQ 222 500 Power Final TP1 Final VR1 Dip point meter 2 2E Transmit Digital multi meter 2 Disconnect the power meter DC AM TX RX VR5 3 5A from ANT terminal DC...

Page 34: ... VR8 Tight Squetch L1 2 3 Helical L4 5 7 9 IF GAIN L11 Diseri TC1 TX frequency TC2 3 RF output 37 38 TM 321A TM 321A ADJUSTMENT ADJUSTMENT ANT Item Condition Operation check TOP VIEW gy 5 TONE 3 Press any switch except Receive FREQ lights sP FREQ the LOW and the Power switches to return to the normal VFO FREQ 6 Memory 1 Press the VFO M switch r indicator ights channel to select the memory lockout ...

Page 35: ...N OUT GND Vee C2 Q3 cs RIG 11 9 3 4 3 2 4 Q1 2 5 6 28C2712 Y 0 4 2SC3295 B D1 155226 D2 1S 181 39 40 A c A TM 321A pc soarp VIEWS WACR LCD ASS Y B38 0303 05 Component side view VCO X58 3090 11 Component side view APC X59 3130 00 Component side view MIC X59 3160 00 Component side view PL2 Ona a aaa e Q1 2 FMW 1 Q3 28A1162 Y 4 q a eo 10 wt j C1 2 NJM4558M 4 IF X59 3140 00 sid VOL X59 3170 00 a Q1 28...

Page 36: ... M 321A FINAL UNIT X45 1360 11 Foi side view 2 ANT D1 M57774 4 Q 181587 D1 D2 MI407 D3 MI308 D4 5 41 FINAL UNIT X45 1360 11 Component side view M57774 Qi pc Board views IT M 321A FINAL UNIT X45 1360 11 Foi side view 2 ANT D1 M57774 4 Q 181587 D1 D2 MI407 D3 MI308 D4 5 41 ...

Page 37: ... Q1 3SK184 S O2 3SK131 V12 Q3 11 16 17 2SC2714 Y O4 2SC3326 A Q5 6 2SB1119S Q7 8 DTC124EK Q9 13 14 21 28C2712 Y Q15 2SA1162 Y Q19 2SC3369 Q20 2SD1406 Y Ci MC7808C IC2 M54959P IC3 TC4094BP C4 wPC1241H D1 1SS226 D2 6 9 10 1SS181 D3 4 155184 D5 02CZ6 2 Y Z D7 8 BA282 Di4 1SS187 TX RX UNIT X57 3170 10 Component side view M 321A pc BOARD VIEW 4b Lia L4 n Aw L4 ...

Page 38: ...w M 321 2SD1406 2SC3369 2SA1 1 62 2SC2712 2SC2714 2SC3326 45 E DTC124EK IN OuT 3SK131 3SK184 c 43 Fo TX RX UNIT X57 3170 10 Foil side view Ba Ps egomk 83 py 80 793 ops Ets a 9140 pcsoarp view M 321 2SD1406 2SC3369 2SA1 1 62 2SC2712 2SC2714 2SC3326 45 E DTC124EK IN OuT 3SK131 3SK184 c 43 Fo ...

Page 39: ...ao N N By Q ip a a 3 6 O QO R 88 x WBS N S a Q 9 0 58 o e e 4C3 oR Yo aa GND x 08 86 15 sul ma NO 20 TM 321A PC BOARD VIEWS CONTROL UNIT X53 3040 13 CONTROL UNIT X53 3040 13 Component side view Foil side view 2SC2712 45 E DTC124EK IN OuT 2 GND M51951BML VREF vin if a 0 o x 0 ao N N By Q ip a a 3 6 O QO R 88 x WBS N S a Q 9 0 58 o e e 4C3 oR Yo aa GND x 08 86 15 sul ma NO 20 ...

Page 40: ... 8 3090 11 PO w w38 LI LCD ASS Y B38 0303 05 Le7se2 J3 0 38k 64 5 MC78O8C X58 3090 x59 3 20 x59 3 40 00 X59 3 60 00 REV AL SCAN o78 Q9 3 42 2sc27 2 p269 0 ss 8 D SS B4 D Ss 84 ae 2SC3369 bs o2cz62Y2 D3 4 sv 66 x59 3 30 00 b2 ss 8 c2 MN406685 X53 3040 3 BUSY JDO Q20 2 D 406 Y d7 8 BA282 ao 2 FMW Q DTC 24EK S RF 3 5 7 9 OVER D14 ss 87 o3 28a 62Y 0 SS 226 Q2 2sc2 2 TH 2802 2 c LASOO6M c2 M5 95 OML Q2...

Page 41: ... 2 7 1 2 2 3 8 8 8 DTC114YK OBOE 8SX ODA OUT 8 GND 3 as 4 8 8 3 Ec 9 3 3 3 oF ds 3 oz NO 50 49 51 52 TM 321Q TM 321A TM 321A IM 321A LEVEL DIAGRAM TSU 5 PC BOARD VIEW 28C2712 4 E Oz 6SxX 3A ya Connector Term na Term na Term na Funct on No No Name FINAL UNIT X45 1360 11 1 8T TX 8T 2 PC Auto powe contro 3 PRO Protect on RA RX ANT DO Dr ve output AP Aud o power B B SP Speaker FB Fna B DB D ve B CONTR...

Page 42: ...03 os 10 Ic 3 7 Vss R8 1M 30 2 DTCU4YK 28C2712 GR Q3 MN6520 MN4094BS NJM4558M 4 194304 O Ic3 2 OUT X 3 2 2 53 TM 32 TSU 5 CTCSS UNIT TSU 5 SCHEMATIC DIAGRAM J2 1 RD 2 c5 GND 3 DET R2 47K R3 18K 4 cTo Q1 5 R4 1OK j R6 2 2K cTs 6 7 22 112 VoD 10 STR VoD 16 23 DET OUT 0 EO 15 2 9 24 14 04 3 8 25 5 00 05 13 4 7 26 11 Q2 27 101 06 12 5 6 28 3 07 6 5 10 C3 03 os 7 29 RX IN 1 R8 1M 30 Vss 2 31 R24 47K Q3...

Page 43: ...OD ELECTRONICS AUSTRALIA PTY LTD INCORPORATED IN N SW 4E Woodcock Place Lane Cove N SW 2066 Australia 321A SPECIFICATIONS Model TM 321A Specifications Frequency range 220 to 225MHz Mode F3E FM 50 ohms Antenna impedance Operating temperature 20 C to 60 C 4 F to 140 F Power requirements 13 8V DC 15 Ground Negative Transmit mode Max 6 5A Current drain Receive mode with no 0 4A input signal Frequency ...

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