Kenwood TK-373G Service Manual Download Page 36 | Manualshive

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TK-373G

36

ADJUSTMENT

Adjustment points TX-RX unit (X57-650)
Component side view

Foil Side View

VR1 : Frequency adjustment

TC1 : Transmit lock voltage adjustment
TC2 : Receive lock voltage adjustment
TC301 :
TC302 :

Band-pass filter waveform adjustment

TC303 :
BPF : Band-pass filter test point
CV(LV) : Lock voltage adjustment terminal.

Fig. 2 Adjustment points

}

MIC

MIC

SP

IC14

C13

BPF

CN3

ANT

VR1

IC12

LV

CV

TC301

TC302

TC303

TC1

TC2

Battery terminal

BPF

ANT

MIC

SP

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Summary of Contents for TK-373G

Page 1: ...8 EXPLODED VIEW 25 PACKING 26 CONTENTS ADJUSTMENT 27 PC BOARD VIEWS DISPLAY UNIT X54 3250 11 37 TX RX UNIT X57 650X XX 39 SCHEMATIC DIAGRAM 45 BLOCK DIAGRAM 49 LEVEL DIAGRAM 51 KNB 14 KNB 15A Ni Cd BATTERY 52 KNB 20N Ni MH BATTERY 52 KMC 17 KMC 21 SPEAKER MICROPHONE 53 SPECIFICATIONS BACK COVER Knob ENCODER K29 5331 03 Knob VOLUME K29 5332 03 Cabinet assy A02 3568 33 Button knob PTT K29 5334 13 Ke...

Page 2: ...for proper identification PERSONNEL SAFETY The following precautions are recommended for personnel safety DO NOT transmit until all RF connectors are verified secure and any open connectors are properly terminated SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive atmosphere This equipment should be serviced by a qualified technician only SERVICE This radio...

Page 3: ...peaker o o o o o Programmable Auxiliary Functions You can program the Side 1 Side 2 A B and 5 5 5 5 5 keys with the functions listed below Aux Display Character DTMF ID BOT DTMF ID EOT Group Down Group Up Home Group Key Lock Lamp Memory RCL Memory RCL STO Memory STO Monitor Momentary Monitor Toggle None No function Redial RF Power Low Scan Scan Del Add Scan Temporary Delete Squelch Off Momentary S...

Page 4: ...sing PTT at this time transmits the code that is currently displayed 12 RF power low Used to temporarily switch transmission output to low power Turning the function on enables Hi Low Low Low Key states are backed up except in the PC mode when they are reset 13 Scan Pressing this key starts scanning Pressing this key again stops scanning 14 Scan Del Add Used to select whether system scan routines ...

Page 5: ...n and response within the drop out delay time the system group is assigned as the new revert system group Selected revert If the system group was changed while scanning the newly selected system group Selected talkback If the system group was changed while scanning the newly selected system group The transceiver talkback on the current receive group 6 Scan message wait The time for staying with th...

Page 6: ... released a beep sounds for 400ms to indicate that the mode has been entered If the scan is on it is resumed the SCN mark goes on When any repeater becomes available a ringing tone sounds and this mode ends The mode is terminated when the system group scan PTT key is changed 7 System search This feature can be programmed to automatically access other programmed systems when the selected system can...

Page 7: ...d tone This tone is output when the PTT button is pressed transmission starts and the repeater is connected to indicate that the user can talk if the Clear to talk function has been set The high tone is output for 100ms Free system ringback mode tone system search mode tone This tone indicates that the transceiver is free system ringback mode or system search mode The low tone is output for 400ms ...

Page 8: ...sceiver is programmed using a personal computer a programming interface KPG 22 and programming software KPG 76D The programming software can be used with an IBM PC or compatible Figure 1 shows the setup of an IBM PC for programming 5 2 Connection procedure 1 Connect the TK 373G to the personal computer with the interface cable 2 When the POWER is switched on user mode can be entered immediately Wh...

Page 9: ...other by connecting them via their SP MIC connectors The operation is as follows the transmit radio is the master and the receive radio is the slave 1 Turn the master TK 373G power ON with the Side1 5 key held down The TK 373G displays CLONE 2 Power on the slave TK 373G 3 Connect the cloning cable to the SP MIC connectors on the master and slave 4 Press the A key on the master while the master dis...

Page 10: ... 4 Taking cure not to cut the speaker lead b open the chassis and case assembly and pull the speaker lead with connector n Separating the chassis from the unit 1 Remove the three screws Lift the unit X54 and rise up the connecter lever in the arrow with your finger Remove the three hexagonal bosses Ω and remove the twelve screws m 2 Remove the solder from the antenna terminal using a soldering iro...

Page 11: ...Q22 BPF MCF XF1 CF1 Wide CF2 Narrow 2nd Local PLL VCO 5R Q14 Q17 D14 R78 R75 C263 C265 R80 D13 Q23 R98 R108 C133 CD1 R79 W N H Wide L Narrow MXO IFI MXI IFO AFO IC4 FM IF SYSTEM Q22 5R W N C107 R74 C108 CF1 CF2 R81 QAD R105 3 IF Amplifier circuit The first IF signal is passed through a four pole monolithic crystal filter XF1 to remove the adjacent channel signal The filtered first IF signal is amp...

Page 12: ...OSC 1 M 1 N PLL IC IC2 PHASE COMPARATOR CHARGE PUMP LPF 10kHz 12 5kHz D2 4 D9 11 Q37 38 Q2 TX VCO Q10 RX VCO Q3 BUFF AMP Q4 RF AMP Q1 X2 multiply Q7 8 T R SW 10kHz 12 5kHz 3 PLL frequency synthesizer The PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission 1 PLL The VCO output is doubled by Q1 and then sent to the PLL IC IC2 The frequency step of...

Page 13: ...4 15 16 18 19 Q35 MUTE DTMF 9 8 6 D A IC13 CPU IC17 QT DQT LTR IC15 2 2 2 TOTCXO 20 TOVCO 22 VCO AF AMP TCXO RX Audio LPF LPF LPF X1 DTMF 2 Drive and Final amplifier The signal from the T R switch D5 is on is amplified by the pre drive Q5 and drive amplifier Q6 to 50mW The output of the drive amplifier is amplified by the RF power amplifier IC1 to 4 0W 1W when the power is low The RF power amplifi...

Page 14: ...iver control program for the CPU and data such as transceiver channels and operating features This program can be easily written from an external device Data such as DTMF memories and the operating status are programmed into the EEPROM IC10 Flash Memory Note The flash memory holds data such as written with the FPU KPG 76D and firmware program User mode Test mode Tuning mode etc This data must be r...

Page 15: ...TMF O DTMF BEEP output 3 2TN Not used 4 DTMSTD I Not used 5 SIM I Destination select 6 BYTE I 5V 5M 7 CNVSS I GND 8 AFSTB O Base Band IC strobe rest output 9 AFFCLK O Base Band IC frame rest system reset output 10 RESET I Reset 11 XOUT O Clock output 12 VSS GND 13 XIN I Clock input 14 VCC 5V 15 NC I NC 16 EN2 I Encoder pulse input 2 17 AUX3 I O Not used 18 INT I Battery voltage monitor input Low b...

Page 16: ...Shift register 1 BU4094BCFV IC5 Pin function DESCRIPTION OF COMPONENTS DISPLAY UNIT X54 3250 11 IC501 IC LCD driver Q501 Transistor Current driver LCD back light LED AVR Q502 Transistor DC switch D505 Diode Speed up D506 LED LCD back light D507 Diode Voltage reference D511 LED LCD back light D515 516 LED LED Key pad back light Ref No Use Function Operation Condition IC1 IC RF Power Module IC2 IC P...

Page 17: ...D4 Variable Frequency control capacitance diode D5 Diode TX RX switch D6 Variable TX modulation capacitance diode D7 Diode ANT switch D8 Zener Diode Overload protection D9 Variable Frequency control capacitance diode D10 Diode TX RX Switch D11 Variable Frequency control capacitance diode D12 Diode Current steering D13 14 Diode RF switch 2nd IF wide narrow D15 Diode Reverse protection D17 Diode Mod...

Page 18: ...ANSISTOR D18 B30 2019 05 LED RE GR C1 CC73HCH1H100C CHIP C 10PF C C3 5 CC73GCH1H010B CHIP C 1 0PF B K2 C4 5 CC73GCH1H010B CHIP C 1 0PF B K C6 CK73HB1A104K CHIP C 0 10UF K C8 CC73GCH1H030B CHIP C 3 0PF B 1 1A A02 3568 33 CABINET ASSY 2 3B A82 0036 02 REAR PANEL 3 2C B09 0351 03 CAP SP MIC 4 2B B11 1220 03 ILLUMINATION GUIDE 5 2B B38 0867 05 LCD 6 2D B62 1576 00 INSTRUCTION MANUAL 7 2D B72 2026 04 M...

Page 19: ...K CHIP C 0 010UF K C71 CC73GCH1H101J CHIP C 100PF J C72 CC73GCH1H180G CHIP C 18PF G K2 C72 CC73GCH1H330G CHIP C 33PF G K C73 CK73GB1H471K CHIP C 470PF K C74 CK73FB1E104K CHIP C 0 10UF K C75 CK73GB1H471K CHIP C 470PF K C76 CK73GB1H102K CHIP C 1000PF K C78 CC73GCH1H470J CHIP C 47PF J C81 CC73GCH1H010C CHIP C 1 0PF C C82 CK73GB1H102K CHIP C 1000PF K K C84 85 CK73GB1H471K CHIP C 470PF K C86 87 CC73HCH...

Page 20: ...471K CHIP C 470PF K C230 CK73GB1H562J CHIP C 5600PF J C231 C92 0507 05 CHIP TAN 4 7UF 6 3WV C232 CK73GB1H103K CHIP C 0 010UF K C233 CC73GCH1H151J CHIP C 150PF J C234 235 CK73GB1H272J CHIP C 2700PF J C236 CK73GB1C104K CHIP C 0 10UF K C238 CK73GB1H392K CHIP C 3900PF K C239 CK73GB1C104K CHIP C 0 10UF K C240 CK73GB1H272J CHIP C 2700PF J C241 CK73GB1H471K CHIP C 470PF K C242 C92 0507 05 CHIP TAN 4 7UF ...

Page 21: ...8304MHZ X3 L77 1835 05 CRYSTAL RESONATOR 9 8304MHZ XF1 L71 0601 05 CRYSTAL FILTER 49 95MHZ CP1 R90 0724 05 MULTI COMP 1K X4 CP2 9 R90 0741 05 MULTIPLE RESISTOR CP10 R90 0724 05 MULTI COMP 1K X4 CP11 18 R90 0741 05 MULTIPLE RESISTOR CP20 RK75HA1J472J CHIP COM 4 7K J 1 16W R1 RK73HB1J124J CHIP R 120K J 1 16W R2 RK73HB1J683J CHIP R 68K J 1 16W R3 RK73GB1J392J CHIP R 3 9K J 1 16W K R3 RK73GB1J472J CHI...

Page 22: ...R 33K J 1 16W R128 RK73GB1J102J CHIP R 1 0K J 1 16W R129 RK73GB1J224J CHIP R 220K J 1 16W R130 R92 1252 05 CHIP R 0OHM J 1 16W R131 RK73GB1J101J CHIP R 100 J 1 16W R132 RK73GB1J104J CHIP R 100K J 1 16W R133 R92 1252 05 CHIP R 0OHM J 1 16W R135 RK73GB1J100J CHIP R 10 J 1 16W R137 RK73GB1J101J CHIP R 100 J 1 16W R138 RK73GB1J102J CHIP R 1 0K J 1 16W R139 RK73GB1J151J CHIP R 150 J 1 16W R140 RK73GB1J...

Page 23: ...R276 278 RK73GB1J104J CHIP R 100K J 1 16W R280 RK73GB1J154J CHIP R 150K J 1 16W R301 R92 0679 05 CHIP R 0OHM R303 304 R92 1252 05 CHIP R 0OHM J 1 16W R305 RK73GB1J104J CHIP R 100K J 1 16W R307 RK73GB1J563J CHIP R 56K J 1 16W R309 RK73GB1J101J CHIP R 100 J 1 16W R310 RK73GB1J221J CHIP R 220 J 1 16W R314 RK73GB1J104J CHIP R 100K J 1 16W R318 RK73GB1J104J CHIP R 100K J 1 16W R320 321 R92 1252 05 CHIP...

Page 24: ...ISTOR Q19 3SK318 FET Q20 21 UMG3N TRANSISTOR Q22 2SC4649 N P TRANSISTOR Q23 RN47A4 TRANSISTOR Q24 25 DTC114EE DIGITAL TRANSISTOR Q26 DTA114EE DIGITAL TRANSISTOR Q27 UPA572T FET Q28 DTA114YE DIGITAL TRANSISTOR Q30 2SK1588 FET Q31 2SC4649 N P TRANSISTOR Q32 2SA1362 GR TRANSISTOR Q33 34 DTC144EE DIGITAL TRANSISTOR Q35 UPA672T FET Q36 2SK1824 FET Q37 2SA1774 S TRANSISTOR Q38 2SC4617 S TRANSISTOR Q39 2...

Page 25: ...6x4 N09 2319 05 B M2x3 5 N09 2331 05 C NUT N14 0582 14 D NUT N14 0583 04 E M2 6x6 N30 2606 46 F M2x3 N39 2030 46 G M2x5 N67 2005 46 H f2x4 5 N78 2045 46 I f2x3 N79 2030 46 J f2x5 N83 2005 46 37 H D 36 5 4 11 2 33 Jx8 IC1 G F F 15 17 18 DISPLAY unit 45 22 16 39 12 B 34 10 TX RX unit A 2 26 27 A 24 B 8 702 21 H TX RX unit B 2 14 18 E I 7 704 K2 only 703 9 42 32 19 44 ...

Page 26: ...ROTECTION BAG H25 2012 04 38 BELT HOOK J29 0658 05 29 PROTECTION BAG H25 0085 04 6 INSTRUCTION MANUAL B62 1576 00 35 SP MIC HOLDER J21 4493 04 K SCREW SET N99 2012 05 28 PACKING FIXTURE H12 1487 02 UPC CODE LABEL WARRANTY CARD 31 ITEM CARTON CASE H52 1859 12 PACKING PAMPHLET K2 only ...

Page 27: ...ut 0 to 1V 10 Distortion Meter Capability 3 or less at 1kHz Input Level 50mV to 10Vrms 11 Spectrum Analyzer Measuring Range DC to 1GHz or more 12 Tracking Generator Center frequency 50kHz to 600MHz Output Voltage 100mV or more 13 8Ω Dummy Load Approx 8Ω 3W 14 Regulated Power Supply 5V to 10V approx 3A Useful if ammeter equipped The following parts are required for adjustment 1 Antenna connector ad...

Page 28: ...n in the following table When required re adjust them following the adjustment procedure to obtain the frequencies you want in actual operation Frequency MHz K type Channel No RX Frequency TX Frequency 1 460 05000 460 10000 2 450 05000 450 10000 3 469 95000 469 90000 4 460 00000 460 00000 5 460 20000 460 20000 6 460 40000 460 40000 7 16 Frequency MHz K2 type Channel No RX Frequency TX Frequency 1 ...

Page 29: ...uning mode Adjustment item Adjustment 1 256 Point tuning indicator Wide Narrow indicator LCD display Test mode H P O W 1 channel No Signalling No 1 1 OFF Wide ON Narrow 450 470 MHz TEST Ch RX frequency MHz TX frequency MHz Low 450 05000 450 00000 Low 455 05000 455 00000 Center 460 05000 460 00000 High 465 05000 465 00000 High 469 95000 470 00000 Panel Tuning Mode K type 470 490 MHz TEST Ch RX freq...

Page 30: ...on Wide F Q T QTfine deviation Wide M A X Maxdeviation W L M A X Maxdeviation W C M A X Maxdeviation W H F Q T QTfine deviation W L F Q T QTfine deviation W C F Q T QTfine deviation W H S Q L 3 Narrow Squelchopen Narrow R S S I RSSI Narrow Side1 S Q L 3 Squelchopen Wide R S S I RSSI Wide S Q L 9 Squelchtight Narrow Side1 S Q L 9 Squelchtight Wide Wide F D Q T DQTfinedeviation Narrow Side1 F D Q T ...

Page 31: ...these switches do not press them using your fingers However if it is necessary to press these switches be sure to press them at 90 angles pressing them at other angles can easily damage the parts ADJUSTMENT 1 Frequency 1 PTT ON Freq Counter ANT VR1 Center frequency Adjust Power meter 460 0 MHz 100Hz K Am meter 480 0 MHz 100Hz K2 2 Max Power 1 Adj item HPOW Check 4 2W or more Check Adjust 256 2 Adj...

Page 32: ...A X M A X Adjust PTT ON Narrow 1 Adj item MAX 1 75kHz Adjust According to PTT ON the larger 8 MIC Panel Test Mode Check 2 2 3 6kHz Sensitivity 1 CH Sig 1 1 Check AG 1kHz 12mV LPF 15kHz PTT ON 9 QT TCXO Adj item X Q T Power meter ANT Encoder Balance Adjust 200 K K2 Dev meter SP MIC connector knob Wide Narrow Oscilloscope 10 DQT TCXO Adj item X D Q T AG Balance Adjust 150 K K2 AF VTVM Wide Narrow 11...

Page 33: ... 15 LTR 1 Adj item FLTR Wide 1 0kHz 50Hz Deviation Adjust Narrow 0 75kHz Adjust LPF 15kHz Wide HPF OFF 2 Adj item F L T R F L T R F L T R Adjust PTT ON Narrow 3 Adj item FLTR Adjust PTT ON 16 DTMF 1 Adj item DTMF Wide 3 0kHz 0 1kHz Deviation Adjust Narrow 1 5kHz Adjust LPF 15kHz Wide HPF OFF PTT ON Narrow 2 Adj item DTMF Adjust PTT ON 17 BATT 1 Adj item BATT Power meter ANT Encoder After pressing ...

Page 34: ...G OUT Oscilloscope more Wide 118dBm 0 28µV MOD 1kHz 3kHz Narrow 116dBm 0 35µV MOD 1kHz 1 5kHz 3 Squelch Open 1 Adj item SQL3 Encoder Adjust to the Adjust Adjust knob squelch Wide SSG OUT squelch threshold point 124dBm 2 Adj item SQL3 Adjust SSG OUT Narrow 123dBm 4 Squelch Tight 1 Adj item SQL9 Adjust to the Adjust Adjust squelch Wide SSG OUT 117dBm 0 3µV threshold point Narrow 2 Adj item SQL9 SSG ...

Page 35: ...Oscilloscope more Wide 118dBm 0 28µV MOD 1kHz 3kHz Narrow 116dBm 0 35µV MOD 1kHz 1 5kHz 3 Squelch Open 1 Adj item SQL3 Encoder Adjust to the Adjust Adjust knob squelch Wide SSG OUT squelch threshold point 122dBm 0 18µV 2 Adj item SQL3 Adjust SSG OUT Narrow 120dBm 0 22µV 4 Squelch Tight 1 Adj item SQL9 Adjust to the Adjust Adjust squelch Wide SSG OUT 117dBm 0 3µV threshold point Narrow 2 Adj item S...

Page 36: ... Transmit lock voltage adjustment TC2 Receive lock voltage adjustment TC301 TC302 Band pass filter waveform adjustment TC303 BPF Band pass filter test point CV LV Lock voltage adjustment terminal Fig 2 Adjustment points MIC MIC SP IC14 C13 BPF CN3 ANT VR1 IC12 LV CV TC301 TC302 TC303 TC1 TC2 Battery terminal BPF ANT MIC SP ...

Page 37: ...KOUT2 KOUT1 KOUT0 KIN4 KIN3 KIN2 KIN1 KIN0 LMP GND CL DI 5M CE C504 C505 C506 C507 C508 C509 C515 C516 CP501 CP502 CP503 D501 D502 D503 D504 D505 D507 IC501 1 16 48 33 17 32 64 49 L501 L502 Q501 B C E Q502 R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R512 R514 R517 R518 R522 R523 R524 CN501 C513 R511 R513 R516 R515 DISPLAY UNIT X54 3250 11 Component Side View O N f e R s s e r d d A 1 0 5 C I...

Page 38: ...7 CP15 R176 R140 R177 R178 MONI LAMP PTT GND C100 C161 D15 L11 R104 R203 R61 R67 C138 C141 C179 C194 C200 C211 CP6 D18 R92 R249 R250 CN1 C229 C186 C187 C266 CP20 R100 R126 R256 R259 C246 C255 IC17 1 4 5 8 X3 D23 C268 R260 LV R261 Q32 X2 C271 R237 D17 R254 R255 IC1 1 2 3 4 C277 Q39 R280 R326 C278 D27 1 CE 5M DI CL GND LMP KIN0 KIN1 KIN2 KIN3 KIN4 KOUT3 KOUT2 KOUT1 KOUT0 SB 16 D28 D29 L39 RXD TXD AF...

Page 39: ...R95 R39 R29 R28 Q20 L15 R18 R33 R94 R99 C131 R305 C307 C311 D10 L21 C30 D5 Q4 R37 R304 C11 R5 Q6 B C E Q5 R9 L8 C39 R24 R6 C12 L10 D3 C13 R10 L9 R25 C38 C40 R27 C41 C85 L12 C10 D2 D4 R13 TC1 R16 C45 C33 D6 C22 C17 L3 L25 Q7 G S D R42 R38 Q2 R3 C14 C16 L4 C18 R36 C27 C64 L31 D9 C62 L26 C72 L22 C63 L30 R105 C133 R93 R97 C124 R86 C114 C123 R84 R103 R102 R117 C70 R48 L24 C78 R51 C43 C42 UL CP1 D1 L1 L...

Page 40: ...7 C115 C146 C147 C155 C156 XF1 C262 C263 R72 C241 C90 C158 C304 C306 C316 C325 R309 R310 R314 R318 TC301 TC302 L303 L307 R253 R252 C3 C265 C327 R258 TC303 L312 L32 R320 A6 TAI A5 S MUTE M MUTE TAO L17 L302 L304 L305 L306 L308 L309 L310 L5 L6 L7 C273 C274 C275 C276 Q38 R245 R276 R277 R278 R307 Q37 R321 C335 C127 C134 L47 IC7 1 3 4 5 L18 L19 L2 L20 L23 L27 L38 R1 C9 C6 R322 C1 R2 R4 R17 R142 R23 R30...

Page 41: ...A B C D E F G I H J K L M O N P Q S R 1 2 3 4 5 6 7 TK 373G SCHEMATIC DIAGRAM Note Component marked with a dot are Parts of pattern 1 ...

Page 42: ...49 50 TK 373G TK 373G BLOCK DIAGRAM ...

Page 43: ... the SSG input value re quired to obtain 12dB SINAD Without Local Level AG is set to the MIC input becomes 3kHz DEV at 1kHz MOD WIDE To make measurements in the AF section con nect the AC level meter In the RF section use a 1000pF coupling ca pacitor KNB 15A SCHEMATIC DIAGRAM SPECIFICATIONS Voltage 7 2V 1 2V x 6 Capacity 1100mAh Dimensions 60 8W x 110 8H x 20 3D mm projections included Charger and...

Page 44: ...IC case J29 0440 08 Clip assy J39 0601 08 Packing MIC N46 2605 60 Screw Clip assy N46 3016 60 Screw Case N80 2005 41 Screw MIC unit S50 1415 05 Tact switch PTT T07 0290 05 Loudspeaker 1W 8Ω T91 0534 08 Condenser MIC Re marks Parts No Description New parts Ref No A02 1979 08 Case Front A02 0980 08 Case Rear E11 0453 08 Phone jack E30 3239 08 Curl cord F07 1414 08 Cover K29 5077 08 Lever PTT S70 044...

Page 45: ...E Narrow FM Noise 45dB Wide 40dB Narrow Audio Distortion Less than 5 Frequency Stability 2 5ppm Channel Frequency Spread 20MHz K K2 SPECIFICATION KENWOOD CORPORATION 14 6 Dogenzaka 1 chome Shibuya ku Tokyo 150 8501 Japan KENWOOD SERVICE CORPORATION P O BOX 22745 2201 East Dominguez Street Long Beach CA 90801 5745 U S A KENWOOD ELECTRONICS CANADA INC 6070 Kestrel Road Mississauga Ontario Canada L5T...

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