Kenwood TK-373G Service Manual

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[Page 1] Kenwood TK-373G

UHF FM TRANSCEIVER TK-373G © 2002-1 PRINTED IN JAPAN B51-8618-00 (S) 931 SERVICE MANUAL GENERAL ...................................................................... 2 SYSTEM SET-UP .......................................................... 2 OPERA...

[Page 2] Kenwood TK-373G

TK-373G 2 Unit Model & TX-RX Unit Display Unit Frequency range Remarks destination K X57-6500-10 450~470MHz IF1 : 49.95MHz TK-373G K2 X57-6500-11 X54-3250-11 470~490MHz LOC : 50.4MHz GENERAL / SYSTEM SET-UP INTRODUCTION SCOPE OF THIS MANUAL...

[Page 3] Kenwood TK-373G

TK-373G 3 OPERATING FEATURES 1. Operating Features The transceiver is shown with the optional KNB-14 battery pack. qq qq q Rotary encoder Your dealer can program the encoder as either System Up/Down or Group Up/Down. Rotate to select a system or gro...

[Page 4] Kenwood TK-373G

TK-373G 4 OPERATING FEATURES 2. Programmable keys The functions the FPU programs to the function keys are described in the following sections. 1) AUX If this key is pressed, a dot appears at the extreme right of the LCD and AUX port which is inside o...

[Page 5] Kenwood TK-373G

TK-373G 5 OPERATING FEATURES ● List type system scan A scan list can be set for each system. The list to be scanned can be changed by changing the display system If many system have been set, the scan speed can be increased by narrowing the systems...

[Page 6] Kenwood TK-373G

TK-373G 6 OPERATING FEATURES PTT button is held down. The alert tone stops when the PTT button is released. 2) PTT ID PTT ID provides a DTMF ANI to be sent with the PTT button every time it is used (Begin of TX ID at beginning of transmission, End of...

[Page 7] Kenwood TK-373G

TK-373G 7 OPERATING FEATURES / REALIGNMENT REALIGNMENT 1. Modes User mode Panel test mode PC mode Firmware programming mode Clone mode Panel tuning mode PC test mode Data programming mode PC tuning mode Checksum 3. For the panel Test Mode For the se...

[Page 8] Kenwood TK-373G

TK-373G 8 Notes: • The data stored in the personal computer must match model type when it is written into the flash memory. • Change the TK-373G to PC mode, then attach the interface cable. 5-3. KPG-22 description (PC programming interface cable:...

[Page 9] Kenwood TK-373G

TK-373G 9 REALIGNMENT 8. If you want to continue programming other TK-373Gs, repeat steps 4 to 7. Notes: ● This mode cannot be entered if the Firmware Programming mode is set to Disable in the Programming software (KPG- 76D). ● When programming t...

[Page 10] Kenwood TK-373G

TK-373G 10 DISASSEMBLY FOR REPAIR Separating the case assembly from the chassis. 1. Remove the two knobs z and three round units x . 2. Remove the two screws c . 3. Expand the right and left sides of the bottom of the case assembly, lift the chas...

[Page 11] Kenwood TK-373G

TK-373G 11 Fig. 3 Wide/Narrow changeover circuit CIRCUIT DESCRIPTION 1. Frequency configuration The receiver utilizes double conversion. The first IF is 49.95 MHz and the second IF is 450 kHz. The first local oscillator signal is supplied form the PL...

[Page 12] Kenwood TK-373G

TK-373G 12 CIRCUIT DESCRIPTION Fig. 4 AF Amplifier and Squelch Fig. 5 PLL circuit 5) Audio amplifier circuit The demodulated signal from IC4 is amplified by IC16 (2/2), high-pass filtered, low-pass filtered, high-pass filtered, band- eliminate filter...

[Page 13] Kenwood TK-373G

TK-373G 13 6. Control Circuit The control circuit consists of a microprocessor (IC13) and its peripheral circuits. It controls the TX-RX unit and transfers data to and from the display unit. IC13 mainly performs the following: (1) Switching between t...

[Page 14] Kenwood TK-373G

TK-373G 14 ● EEPROM Note : The EEPROM stores tuning data (Deviation, Squelch, etc.). Realign the transceiver after replacing the EEPROM. 3) Low battery warning The battery voltage is monitored by the microprocessor (IC13). When the battery voltage...

[Page 15] Kenwood TK-373G

TK-373G 15 Microprocessor : 30622M4A-410GP (TX-RX UNIT : IC13) ■ Pin function SEMICONDUCTOR DATA LCD Driver : LC75823W (Display UNIT IC501) ■ Block diagram LATCH & DRIVER SHIFT REGISTER COMMON DRIVER ADDRESS DETECTOR CLOCK GENERATOR VDDCECLD...

[Page 16] Kenwood TK-373G

TK-373G 16 SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTS Pin Port I/O Function No. Name 49 A19 - Not used 50-59 A18-A9 - Flash memory address bus 60 VCC - +5V 61 A8 - Flash memory address bus 62 VSS - GND 63-70 A7-A0 - Flash memory address bus 71-75...

[Page 17] Kenwood TK-373G

TK-373G 17 Q26 Transistor DC switch / Squelch Q27 FET DC switch / 5T, Save Q28 Transistor DC switch / 5M Q30 FET SP Mute switch Q31 Transistor Clock frequency shift Q32~34 Transistor DC switch / SP Mute Q35(1/2) FET Mute switch / MIC line mute Q35(2/...

[Page 18] Kenwood TK-373G

18 K : TK-373G K K2 : TK-373G K2 TK-373G PARTS LIST Parts No. Description Address New parts Destination Destination TK-373G Ref. No. Parts No. Description Address New parts ∗ New Parts. indicates safety critical components. Parts without Part...

[Page 19] Kenwood TK-373G

K : TK-373G K K2 : TK-373G K2 TK-373G PARTS LIST 19 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-6500-XX) C9 CK73HB1H471K CHIP C 470PF K C10 CC73GCH1H060B CH...

[Page 20] Kenwood TK-373G

TK-373G PARTS LIST 20 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-6500-XX) K : TK-373G K K2 : TK-373G K2 TX-RX UNIT (X57-588X-XX) C158 CK73FB1A105K CHIP C 1...

[Page 21] Kenwood TK-373G

K : TK-373G K K2 : TK-373G K2 TK-373G PARTS LIST 21 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-6500-XX) CD1 L79-1794-05 TUNING COIL CF1 L72-0968-05 CERAMIC...

[Page 22] Kenwood TK-373G

TK-373G PARTS LIST 22 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-6500-XX) K : TK-373G K K2 : TK-373G K2 R64,65 RK73GB1J104J CHIP R 100K J 1/16W R67 RK73GB1...

[Page 23] Kenwood TK-373G

K : TK-373G K K2 : TK-373G K2 TK-373G PARTS LIST 23 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-6500-XX) TX-RX UNIT (X57-588X-XX) R207 RK73GB1J101J CHIP R 1...

[Page 24] Kenwood TK-373G

TK-373G PARTS LIST 24 Ref. No. Parts No. Description Address New parts Ref. No. Parts No. Description Address New parts Destination Destination TX-RX UNIT (X57-6500-XX) K : TK-373G K K2 : TK-373G K2 TX-RX UNIT (X57-588X-XX) Q18 FP210 TRANSISTOR Q19 3...

[Page 25] Kenwood TK-373G

TK-373G 25 EXPLODED VIEW Parts with the exploded numbers larger than 700 are not supplied. A B 1 2 3 2.5 4 4 M2 M3 J32-0925-04 H 43 701 1 25 C 40 41 20 23 SP 13 A M3.6x4 :N09-2319-05 B M2x3.5 :N09-2331-05 C NUT :N14-0582-14 D NUT :N14-0583-...

[Page 26] Kenwood TK-373G

TK-373G 26 C D 1 2 3 28. PACKING FIXTURE (H12-1487-02) 3. CAP (SP/MIC) (B09-0351-03) 30. PROTECTION 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...

[Page 27] Kenwood TK-373G

TK-373G 27 ADJUSTMENT Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 450 to 470MHz (K) 470 to 490MHz (K2) (SSG) Modulation Frequency modulation and external modulation. Output -...

[Page 28] Kenwood TK-373G

TK-373G 28 ADJUSTMENT Test Mode ■ Test mode operating features This transceiver has a test mode. To enter test mode, press the [∞] key and turn the power on. Hold the [∞] key until the test channel No. and test signalling No. appear on LCD. Tes...

[Page 29] Kenwood TK-373G

TK-373G 29 ADJUSTMENT Press [A], to enter tuning mode. Use the [∞] key to write tuning data through the tuning modes, and the channel selector knob to adjust the tuning requirements (1 to 256 appears on LCD). Use the [5] key to select the adjustmen...

[Page 30] Kenwood TK-373G

TK-373G 30 ADJUSTMENT ■ Tuning mode [B] [B] [ ] [ ] [ ] [ ] [ ] [ ][ ] [B] [B] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [B] [ ] [ ] [B] ...

[Page 31] Kenwood TK-373G

TK-373G 31 Transmitter Section Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark 1. Setting 1) BATT terminal voltage:7.5V 2) SSG Standard modulation [Wide] MOD:1kHz, DEV:3kHz [Narrow] MOD:1kHz, DEV:1.5k...

[Page 32] Kenwood TK-373G

TK-373G 32 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark 6. Low Power [Panel Test Mode] Check 1) CH-Sig:1-1 Check 0.5~1.5W Set low power (Push [∞]) 1.2A or less PTT:ON 2) CH-Sig:2-1 PTT...

[Page 33] Kenwood TK-373G

TK-373G 33 Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark ADJUSTMENT 13. QT Deviation 1) Adj item [FQT] Power meter ANT Encoder Wide:0.85kHz ±40Hz Adjust Adjust [∗∗∗] Dev meter SP/MIC connecto...

[Page 34] Kenwood TK-373G

TK-373G 34 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark K type 1. BPF (PANEL TEST MODE) Tracking generator ANT TC301, TC302, Adjust wave form to figure 1. Adjustment CH-Sig 1-1 Spectrum ...

[Page 35] Kenwood TK-373G

TK-373G 35 ADJUSTMENT Item Condition Measurement Adjustment Specifications/ Test equipment Terminal Parts Method Remark K2 type 1. BPF (PANEL TEST MODE) Tracking generator ANT TC301, TC302, Adjust wave form to figure 1. Adjustment CH-Sig 1-1 Spectrum...

[Page 36] Kenwood TK-373G

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 adjustme...

[Page 37] Kenwood TK-373G

ABCDEFGH I JKLMNOPQRS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 37 38 TK-373G DISPLAY UNIT (X54-3250-11) Component Side View (J72-0663-02) PC BOARD VIEW DISPLAY UNIT (X54-3250-11) Foil Side View (J72-0663-02) C501 C502 C503 1 16 SB KOUT3 KOUT2 KOUT1 KOUT0 KIN...

[Page 38] Kenwood TK-373G

ABCDEFGH I JKLMNOPQRS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 Q26 R101 MIC1 –+ IC6 1 1 1 45 8 8 8 9 9 16 16 IC11 IC14 1 11 12 22 23 33 34 44 IC10 IC13 IC5 IC15 1 45 8 C222 C257 C208 C249 IC19 C254 C250 C258 C245 Q36 S D G S D G C260 C261 C101 D22 C159 C20...

[Page 39] Kenwood TK-373G

ABCDEFGH I JKLMNOPQRS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 4241 TK-373G PC BOARD VIEW TX-RX UNIT (X57-650X-XX) Foil Side View DTA114YE 2SC4226(R24) 2SA1774(S) 2SC4617(S) 2SC5108(Y) 2SC4649(N,P) E C B 2SC4988 3 1 4 TA31136FN 8 1 9 16 .ON.feRsserddA 4CIL7 ...

[Page 40] Kenwood TK-373G

ABCDEFGH I JKLMNOPQRS 1 3 4 5 6 7 8 9 10 11 12 13 14 2 DTA114EE DTA114YE DTA144EE DTC114EE DTC144EE 2SA1362(GR) 2SC4226(R24) 2SC4617(S) 2SC5108(Y) 2SC4649(N,P) 2SC5010-T1 E C B 2SJ243 2SK1824 S D G TA7368F 10 1 5 6 43 TK-373G PC BOARD VIEW 2SC4988 3 ...

[Page 41] Kenwood TK-373G

A B C D E F G IH J K L M ON P Q SR 1 2 3 4 5 6 7 TK-373GSCHEMATIC DIAGRAM Note) Component marked with a dot ( • ) are Parts of pattern 1. ...

[Page 42] Kenwood TK-373G

49 50 TK-373G TK-373G BLOCK DIAGRAM ...

[Page 43] Kenwood TK-373G

FM IF SYSTEM C309 Q301 –120dBm –118dBm –105dBm –107dBm –111dBm –109dBm –100dBm 80mVrms 390mVrms Q22 C131 C242 IC16 5 4 3 41 IC14 IC11 SP 390mVrms 260mVrms 590mVrms 9.5mVrms 0.63mVrms -17.0dBm IC17 DAC 12 13 ALC COMP SW IDC 6 98 191815 1...

[Page 44] Kenwood TK-373G

TK-373G 53 KMC-17/KMC-21 (SPEAKER MICROPHONE) KMC-17 (Speaker microphone) KMC-21 (Speaker microphone) Parts No. Description New parts Ref. No. A02-0907-08 Case (Front) A02-0908-08 Case (Rear) B09-0316-08 Cap D10-0606-08 Lever (PTT) E11-0421-05 Phone ...

[Page 45] Kenwood TK-373G

TK-373G 54 General Frequency Range............................................................. 450~470MHz (K) 470~490MHz (K2) Systems ........................................................................... Max. 32 Groups ..........................