Page 2 - VHF FM TRANSCEIVER; SERVICE MANUAL
© 2000-1 PRINTED IN JAPANB51-8497-10 (N) 1269 VHF FM TRANSCEIVER TK-760G/762G SERVICE MANUAL REVISED Please use this manual in place of the service manual (preliminary version), B51-8497-00.We have added the information on the circuit description, specifications, and K2 version specifications to the...
Page 4 - GENERAL
3 TK-760G/762G 1 3 + – 7 6 13 15 5. INSTALLATION PLANNING – CONTROL STATIONS5-1. Antenna system Control station. The antenna system selection depends on many factors and is beyond the scope of this manual.Your KENWOOD dealer can help you select an antenna sys-tem that will best serve your particular...
Page 6 - Controls and Functions; OPERATING FEATURES
5 TK-760G/762G 1. Controls and Functions 1-1. TK-760G Front Panel IO (Power) switchPress to switch the transceiver ON (or OFF).LED indicatorLights red while transmitting. Lights green while receiv-ing. Flashes orange while receiving a Code Squelch orSelective Call code, or a 2-Tone code that matches...
Page 7 - • POWER key
6 TK-760G/762G 1-5. Rear panel Antennaconnector Externalspeaker jack Power inputconnector 1-6. Programmable Auxiliary Functions The following keys can be programmed with the func- tions listed below.TK-760G : / (left side), / (right side), MON, A, D/A, , , and SCN. TK-762G : / (left side), / (right ...
Page 9 - Details of Features
8 TK-760G/762G ■ SCAN start condition One or more non-priority channels must be added to all channels that can be scanned. The transceiver must be innormal receive mode (PTT off). When you activate the key programmed to the scan func- tion, the scan starts. The scan icon "SCN" lights and ...
Page 10 - Audible User Feedback Tones
9 TK-760G/762G ■ Off hook decode If the Off hook decode function has been enabled, re- moving and replacing the microphone on the hook has noeffect for decoding QT/DQT and option signalling. ■ "TOT" pre-alert The transceiver has "TOT pre-alert timer. This parameter selects the time at wh...
Page 11 - OPERATING FEATURES / REALIGNMENT; REALIGNMENT; How to Enter Each Mode
10 TK-760G/762G ■ Busy tone Sounds in conventional mode, when busy channel lock- out is functioning. You can select yes or no for the optionalfeature's warning tone. ■ Group call tone Sounds when a group call with the correct DTMF/2-tone option signalling is received, repeats 7 times. You can se-lec...
Page 12 - Firmware Programming Mode
11 TK-760G/762G REALIGNMENT 5-4. Programming Software Description The KPG-56D programming disk is supplied in 3-1/2" disk format. The software on this disk allows a user to programTK-760G/762G radio via a programming interface cable(KPG-46). 5-5. Programming With IBM PC If data is transferred to...
Page 14 - Channel Setting Mode
13 TK-760G/762G 9. Channel Setting Mode Each channel can be setup in its action mode by using the panel keys.• Pressing [MON] when "SELF" is diaplyed, sets channel setting mode. • Select an item set using [ ] then change the selection with the [CH / ]. • The data displayed using [D/A] is sto...
Page 16 - Function Setting Mode
15 TK-760G/762G 10. Function Setting Mode All channels can be set up together in the action mode by using the panel keys.• Pressing [ ] when "SELF" is displayed, sets the function setting mode. • Select an item set using [ ] then change the selection with the [CH / ]. • The data displayed us...
Page 21 - Accessory Connection Cable; INSTALLATION
20 TK-760G/762G 3 4 5 6 7 8 9 1. Accessory Connection Cable (KCT-19 : Option) The KCT-19 is an accessory connection cable for con- necting external equipment. The connector has 15 pins andthe necessary signal lines are selected for use. 1-1. Installing the KCT-19 in the transceiver 1. Remove the upp...
Page 22 - -1. External Connector Accessory Terminal Method
21 TK-760G/762G INSTALLATION 2. Accessory Terminal (TX-RX Unit) 2-1. External Connector Accessory Terminal Method No. Name I/O Description Note CN1 1 8C O DC 8V output 2 5S O DC 5V output 3 AUX5 O SMRD : Reset output *1 4 AUX6 O 5SC : 5S control (Cannot use) *1 5 NC – Non-connection 6 AUX3 O SQ : Sq...
Page 23 - Table 1; Fitting the Control Panel Upside Down
22 TK-760G/762G INSTALLATION 3-2. Modifying the Transceiver Modify the transceiver as follows to turn the power or the Horn Alert or Manual Relay function on and off with theignition key.1. Remove the lower half of the transceiver case.2. Set jumper resistors (0 Ω ) R134 and R135 of the TX-RX unit (...
Page 24 - • Connection procedure
23 TK-760G/762G INSTALLATION 1 2 3 4 5 6 2. Fold the flat cable ( ) in the opposite direction ( ). 3. Rotate the control section ( ) 180 degrees ( ). 4. Insert the flat cable into the control section connector, CN501 ( ). 5. Mount the control section on the transceiver ( ). CN501 1 2 3 4 5 6 Fig. 7 ...
Page 25 - CIRCUIT DESCRIPTION
24 TK-760G/762G Frequency Configuration The receiver utilizes double conversion. The first IF is 49.95MHz and the second IF is 450kHz. The first local oscil-lator signal is supplied from the PLL circuit. The PLL circuit in the transmitter generates the neces- sary frequencies. Figure 1 shows the fre...
Page 26 - PLL Frequency Synthesizer
25 TK-760G/762G ■ Wide/Narrow Changeover Circuit The W/N port (pin 4) of the shift register (IC510) is used to switch between ceramic filters. When the W/N port ishigh, Q4 turns on and the ceramic filter SW diode (D8, D10)CF1 turns on to receive a Narrow signal. At the same time,Q35 turns on and one...
Page 27 - Transmitter System
26 TK-760G/762G D102,104 Q103 TX VCO Q106 BUFF AMP D101,103 Q101 RX VCO Q102, 104,105 T/R SW Charge pump LPF Phase comparator 1/M 1/N PLL/VCO 5kHz/6.25kHz 5kHz/6.25kHz REF OSC 16.8MHz PLL DATA IC3 : PLL IC Q9 RF AMP Fig. 6 PLL circuit ■ Unlock Circuit During reception, the 8RC signal goes high, the ...
Page 28 - Control Circuit
27 TK-760G/762G ■ APC Circuit The automatic transmission power control (APC) circuit detects part of a power module output with a diode (D35,D36) and applies a voltage to IC15. IC15 compares the APCcontrol voltage (PC) generated by the D/A converter (IC6)and DC amplifier (IC7) with the detection out...
Page 29 - Power Supply Circuit; Decode; Encode; Power supply circuit
28 TK-760G/762G ■ Encode The QT and DQT signals are output from TO of the CPU (IC502) and summed with the external pin DI line by thesumming amplifier (IC2) and the resulting signal goes to theD/A converter (IC6) of the TX-RX unit. The DTMF and 2-TONE signals are output from DTMF of the CPU and goes...
Page 30 - SEMICONDUCTOR DATA; Terminal function
29 TK-760G/762G SEMICONDUCTOR DATA ■ Terminal function Pin No. Name I/O Function 1 EMGT O External MIC control. Mobile MIC : H 2 DTMF O DTMF/2TONE/BEEP output. 3 2TN I 2TONE decode pulse input. 4 DTMSTD I DTMF decode detect. Detect : H 5 SIM I Destination select. 6 BYTE I +5V (5C). 7 CNVSS I GND. 8 ...
Page 31 - Shift Register : BU4094BCFV; Block diagram
30 TK-760G/762G SEMICONDUCTOR DATA Shift Register : BU4094BCFV ■ Terminal function (TX-RX unit IC510) Pin No. Port Name Function 4 Q1 W/N Wide/Narrow SW. Narrow : H 5 Q2 MUTE MIC mute (M models only). Mute : H 6 Q3 MBL MIC/LCD backlight control. Backlight on : H 7 Q4 LED0 Red LED. LED lights : H 11 ...
Page 32 - DESCRIPTION OF COMPONENTS
31 TK-760G/762G DESCRIPTION OF COMPONENTS Display Unit (X54-3270-10) : TK-760G Ref. No. Use/Function Operation/Condition D801 Reverse current prevention D802~805 Light emission D808 Current stability IC801 LCD driver Q801 DC switch (LED) Display Unit (X54-3280-10) : TK-762G Ref. No. Use/Function Ope...
Page 34 - PARTS LIST
33 TK-760G/762G 2nd Word G H J K L ppm/ ° C ± 30 ± 60 ± 120 ± 250 ± 500 Example : CC45TH = –470 ± 60ppm/ ° C Multiplier 2nd number 1st number 2 2 0 = 22pF CAPACITORS CC 45 TH 1H 220 J 1 2 3 4 5 6 1 = Type … ceramic, electrolytic, etc. 4 = Voltage rating 2 = Shape … round, square, ect. 5 = Value 3 = ...
Page 43 - Parts with the exploded numbers larger than 700 are not supplied.
42 TK-760G/762G EXPLODED VIEW (TK-760G) Parts with the exploded numbers larger than 700 are not supplied. 1 2 A B C 1 24 3 24 2 40 37 7 11 6 17 22 22 23x2 27 24 9 25 14 12 21x2 44 26 IC400 16 701 702 Cx2 703 A C C Cx2 Dx11 B B A Ax2 703 TX-RX unit (X57-595) (B/2) TX-RX unit (X57-595) (A/2) Display u...
Page 45 - PACKING
44 TK-760G/762G PACKING Parts with the exploded numbers larger than 700 are not supplied. G H 1 2 3 5 Cap (B09-0235-05) 8 Instruction manual (B62-1257-10) : M (B62-1258-00) : K,K2 705 Warranty card 13 DC cord (E30-3339-05) 19 Fuse (10A) (F51-0016-05) x 2 30 Polystyrene foamed fixture (F) (H10-6618-1...
Page 46 - ADJUSTMENT; F R E Q
45 TK-760G/762G ADJUSTMENT Test Mode (TK-760G Only) ■ Test Mode Operating Features This transceiver has a test mode. To enter test mode, press [SCN] key and turn power on. Hold [SCN] key un-til test channel No. and test signalling No. appears onLCD. Test mode can be inhibited by programming. To exit...
Page 47 - Tuning Mode
46 TK-760G/762G FREQ_ _XX Frequency adj. Display Function name HPOW_XXX RF high power H.POW_XXX Hi power (L) H.P.OW_XXX Hi power (L') [A] [D/A] [D/A] [D/A] [D/A] [D/A] H.P.O.W_XXX Hi power (C) H.P.O.W._XXX Hi power (H') H.P.O.W._.XXX Hi power (H) LPOW_XXX RF low power L.POW_XXX Low power (L) L.P.OW_...
Page 48 - Test Equipment Required for Alignment
47 TK-760G/762G Test Equipment Required for Alignment Test Equipment Major Specifications 1. Standard Signal Generator Frequency Range 136 to 174MHz (SSG) Modulation Frequency modulation and external modulation Output –127dBm/0.1 µ V to greater than –7dBm/100mV 2. Power Meter Input Impedance 50 Ω Op...
Page 50 - Receiver Section; Common Section
49 ADJUSTMENT Measurement Test- equipment Unit Terminal Adjustment Unit Parts Method Specifications/Remarks Condition Item TK-760G/762G Receiver Section 1. Discriminator 1) Set test mode SSG Rear ANT TX-RX L5 AF output maximum. • Wide CH : CH1 - Sig1 panel (A/2) SSG output : –53dBm/501 µ V AF VTVM A...
Page 52 - Transmitter Section
51 ADJUSTMENT Measurement Test- equipment Unit Terminal Adjustment Unit Parts Method Specifications/Remarks Condition Item TK-760G/762G 6. QT check 1) Set test mode SSG Rear ANT CH : CH1 - Sig4 panel SSG MOD AF VTVM ACC INT : 3kHz (Wide), 1.5kHz (Narrow) Distortion (EXT.SP) EXT : 151.4Hz meter SSG s...
Page 55 - PC BOARD VIEWS
54 TK-760G/762G A C E B D 1 3 5 7 2 4 6 TK-760G/762G PC BOARD VIEWS DISPLAY UNIT (X54-3270-10) : TK-760GComponent side view DISPLAY UNIT (X54-3270-10) : TK-760GFoil side view D804 D803 D805 D802 J72-0683-02 CN801 MBL 5C CE CL E E SB DI 1 2 7 8 C801 C802 C803 C804 C805 C806 C807 D801 D808 IC801 B C E...
Page 56 - Component side view
J H F D B I G E C A 1 3 5 7 2 4 6 55 56 PC BOARD VIEWS TK-760G/762G Component side Foil side D801 D804 D803 J72-0684-02 CN801 1 MBL 5C CE CL E E SB DI 2 7 8 IC801 1 12 13 24 36 37 48 25 R803 R805 Q801 Q802 Q803 Q805 R810 R809 C801 C806 C808 C812 R812 R804 C804 R802 C803 C802 R801 R808 C807 C805 R806...
Page 57 - PC BOARD VIEW
A B C D E F G H I J K L M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C91 C67 D12 D13 R93 C104 Q32 L24 L20 L25 IC5 IC6 IC3 C10 C7 C3 C60 C107 C75 Q9 C54 XF1 CN4 CN5 C50 C131 C117 C161 C160 R68 C74 C46 C43 R44 IC4 R78 IC7 C103 C98 C81 R71 Q12 C89 C93 C99 C1 C5 C8 C11 C2 C6 C9 C12 C141 C144 C134 IC12...
Page 58 - Foil side view
S R Q P O N M L K J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R155 R160 DB 8C SB D22 C92 C94 C95 R69 L17 IC14 R123 R95 C200 C156 R133 Q23 C221 C205 C148 C222 C274R170 D29 C179 D2 Q1 D24 C4 R29 R151 C142 C174 R108 R113 C139 C168 R137 C151 R121 C147 C170 D17 C162 C159 R101 R98 C112 C115 C118 ...
Page 59 - Component side view + Foil side
A B C D E F G H I J K L M N O P Q R S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C91 C 67 D12 D13 R93 C 10 4 Q32 L2 4 L2 0 L25 IC 5 IC6 IC 3 C10 C7C3 C 60 C 10 7 C 75 Q9 C 54 XF1 C N 4 C N 5 C 50 C131 C117 C161 C160 R 68 C 74 C46 C 43 R 44 IC 4 R 78 IC7 C103 C 98 C 81 R 71 Q12 C89 C 93 C 99 C1C5C8 C11 C2 C6 C...
Page 62 - SCHEMATIC DIAGRAM
T R P N L J H F D B S Q O M K I G E C A 1 3 5 7 2 4 6 SCHEMATIC DIAGRAM TK-760G Note : Components marked with a dot (·) are parts of patterun 1. 70
Page 64 - BLOCK DIAGRAM
TK-760G/762G TK-760G/762G TK-760G/762G BLOCK DIAGRAM 77
Page 65 - LEVEL DIAGRAM
79 78 LEVEL DIAGRAM Receiver Section Center Frequency 49.95MHz 450kHz Audio Frequency Control Unit TX-RX Unit VCO Unit TX-RX Unit Power Module TX-RX Unit To make measurements in the RF section, connect the RF level meter.In the RF section, use a 0.01 µ F coupling capacitor. (The display shows the SS...
Page 66 - TERMINAL FUNCTION
80 TK-760G/762G TERMINAL FUNCTION CN1 (TX-RX Unit) Pin No. Name Function 1 8C DC 8V output. 2 5S DC 5V output. 3 AUX5 SMRD : Reset output. *1 4 AUX6 5SC : 5S control (Cannot use). *1 5 NC Non-connection 6 AUX3 SMCK : Clock pulse output. *1 SQ : Squelch detect output. *2 7 AUX1 SMRQ : Ack Req input. ...
Page 67 - SPECIFICATIONS; RECEIVER
81 TK-760G/762G SPECIFICATIONS GENERAL Frequency Range ................................ K : 148 to 174MHz K2 : 136 to 162MHz M : 146 to 174MHz Number of Channels ........................... TK-762G : Maximum 8 channels TK-760G : Maximum 128 channels Number of Groups .............................. TK...
Page 68 - KENWOOD CORPORATION
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 1S8 KENWOOD ELECTRONICS DEUTSCH...
