Kenwood TK-940 manual

1 800MHz/900MHz FM TRANSCEIVER O 1994-8 PRINTED IN JAPAN B51-8281-00( N ) 121 9 C' Microphone SERVICE MANUAL BLOCK DIAGRAM .......................................... :;..:.:.$@$::':, '~','.'- "!?$LU~CO .i@&4170-XX) ................................... . 'i ;a., " ' 66 ................... LEVEL D[...]

GENERAL INTRODUC'TION SCOPE OF THIS MANUAL ns are recommended for This manual i? intended for use by experienced v technicians familiar with similar types of commercial one is within two feet (0.6 grade communications equipment. It contains all re- quired service information for the equipment and is ransmit until all RF connectors are verified[...]

9401941 E INSTALLATION 5. INSTALLATION PLANNING - CONTROL STATIONS 5-1. Antenna system e vehicle and determine how and where Control station. The antenna system seect~on de- pends on many factors and IS beyond the scope of this cable runs for protection against pinching or manual. Your KENWOOD dealer can help you select g wiring, and radio installa[...]

SYSTEM SET-UP Merchandise received P t License and frequency allocated by FCC I Choose the type of transceiver Y- See page 16. Modify the control unit when used KDD-4. w (The frequency and signaling (option) data are programmed for the transceiver.) Frequency range (MHz) TX 806-825 851 -870 RX 851-870 TX 896-902 935-941 RX 935-941 I See page 21. Se[...]

OPERATING FEATURES 1. Operation Featu tes 2. Transceiver Controls and Indicators (Fig. 1) The TK-9401941 s an 8001900MHz-band EFJ LTRIM- 2-1. Font Panel Controls compat~ble trunked ladlo deslgned to operate In both All the keys on the front panel ale momentary-type trunked and convent~ona modes The programmable push buttons The funct~ons of these k[...]

OPERATING FEATURES AUX key This key toggles the auxiiiary function on and off. If this key is pressed once, the auxiliary function is en- abled. If the key is pressed again, the auxiliary function is d~sabled. The confirmation tone is the same as that of the scan key. The following auxiliary functions are available and can be progl-amr-iied by the [...]

OPERATING FEATURES . Alphanumeric display The 8-dig~t alphanumerlc (NN) display also shows system and group numbers. 8-digit alphanumeric displays can be programmed for each group. If the alphanumeric display IS not programmed, the system and group numbers are displayed. After the dealer's qualfied service technician programs the transceiver, [...]

OPERATING FEATURES 3-5. SystemIGroup Revert SystemIGroup revert can be programmed for one of the following: Last call revert The system or group changes to the revert system or group when a call IS received with the system or group being scanned. Last use revert If a systemlgroup call is received during scanning and the PTT button 1s pressed for tr[...]

1 OPERATING FEATURES 3-13. Free System Ringback > ) Thls feature is avalabe only when a telephone inter- connect ID code IS selected. If a busy tone sounds when the PTT button IS pressed, the transceiver enters this mode automat~cally. When the PTT button is released, a beep sounds for 400ms to indicate that the mode has been entered. If the sca[...]

OPERATING FEATURES 3-19. AUTO TEL Delay tone A telephone interconnect call can be made by sim- Th~s tone is output when the Pn button is pressed ply pressing the AUX (Auxiliary) key by assigning this and the repeater is accessed three times or more to feature to the key. This feature accesses the TEL indicate connection with the repeater is delayed[...]

OPERATING FEATURES 3-22. Conventional System Operation Up to 250 (MAX) channels can be programmed for each system programmed as a conventional system. Channels can be selected by the group key. OT (~uiet-~alk), DQT (D~gital Quiet-Talk), or carrier squelch can be set for transmit or receive channels. If signaling is set for transmission, a squelch t[...]

OPERATING FEATURES 3-24. Horn Alert 3-25. System Scan Type Horn alert can be set to on or off for each group Fix system scan Elther cont~nuous or non-continuous operation can be AII the set systems except locied-out ones are set by the FPU The horn alert port IS enabled or scanned If the DELIADD feature IS asslgned to the d~sabled as follows, AUX k[...]

OPERATING FEATURES C 4. Transceiver Programming Ir 4-1.lntroduction The TK-9401941 transceiver IS programmed uslng an IBM PC or compatlbe machlne, a programming Inter- face (KPG4), and a programmlng dlsk (KPG-25D) Fig- ure 4 shows the setup for an IBM PC .. Programming disk (KPG-25D) Fig. 4 4-2. KPG-4 Description (Optional PC programming interface [...]

OPERATING FEATURES 4-5. Clone Mode (Figure 51 Programmed data is transferred from one transceiver to another by using a microphone cable. 1. Connect the master set to the slave set with. 2. Turn the slave set on 3. Hold down the AUX key, turn the master set on, and keep the AUX key down for two more seconds. "CLONE" appears on the display[...]

OPERATING FEATURES . GROUP key 5-2. Panel Tuning Mode Used to select the signal~ng encodeldecode data or This mode can be inhibited by programming. The squelch adjustment. following can be adjusted with the front keys: Squelch level Table 2 down for two more seconds. The display changes from "TUNING" to "800MHz" (TK-940) or &quo[...]

INSTALLATION 1. Installing the Signaling Unit (KDD-4 D'TMF : Option) 1-1. KDD-4 assembly 1. Solder the 9-pin leads with connector to the KDD-4 board locations designated with the unit specification numbers. (Fig. 1) Fig. 1 2. Put an insulating tube around the KDD-4 board and heat it so that the tube encases the board. (Fig. 2)[...]

INSTALLATION 1-2, Installing the KDD-4 in the transceiver I. Remove the two halves of the case transceiver and the control panel. (Fg. 3) Fig. 3 2, Install the KDD-4 on the TX-RX unit (B12). (Fig. 4) 1) Attach the pad to the KDD-4 ( 0 ). 2) Plug the KDD-4 connector into CIV203 of the TX- RX unit (BIZ) ( 0 ). 3) Attach the KDD-4 to the TX-RX unit (0[...]

INSTALLATION 1-3. Setting the KDD-4 code (DTMF) This product IS bu~lt using surface mount construc- tion techniques. The solder jumpers used to configure this product should be changed using equipment-and techniques suitable for surface mount device repair. Abuse due to the use of inappropriate tools and tech- niques will VOID the warranty. * 0 3 ,[...]

INSTALLATION 3. Insert the KCT-19 cable ( 0) into the chassis ( 0) The wire harness band (0) must be inside the chassis. 4. Relocate the DC cord bushing in the chassis (0). 5. Connect the KCT-I9 to the TX-RX unit (A121 as shown in Figure 7 i 0 1. 6. Connect the KCT-19 to i!le external accessory by inserting the crimp terminal (0) into the square pl[...]

INSTALLATION 3. Ignition Sense Cable (KCT-18 : Option) The KCT-18 is an optional cable for enabling the ignition function. The ignition function lets you turn the @ power to the transceiver on and off with the car ignition 1 i key. I j If you use the Horn Alert function (KDD-4 requ~red) or the Manual Relay function, you can turn the function , I 1 [...]

INSTALLATION p 4. External Speaker 4-1. KES-3 : Option I The KES-3 IS an external speaker for the 3 5-mm- i I dameter speaker jack Connection procedure I. Connect the KES-3 to the 3.5-rnm-diameter speaker jack on the rear of the transceiver. 1 4-2. KES-4 : Option The KES-4 is an external speaker used w~th the r accessory connection cable. Connectio[...]

INSTALLATION 5. Fitting the Control Panel Upside Down The TK-9401941 control panel can be fitted upside down, so the transceiver can be niounted with ~ts internal speaker (in llie upper haif of the case) facing down in your car 1. Reniove the control panel and the TX-RX unit !B/2) control section. (Fig. 12) Fig. 12 2. Fo1.d the flat cable ( 0 diffe[...]

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CIRCUIT DESCRIPTION I 1. Overview 2. Circuit Configuration by Frequency This transceiver is an 800MHz-band (TK-9401, The receiver IS a double-conversion superhet with a 9OOMHz-band (TK-941) EFJ LTRrM trunked-system- first intermediate frequency (IF) of 45.0375MHz (TK- compatible FM transceiver that can be programmed to 940), 39.0375MHz (TK-941) and[...]

CIRCUIT DESCRIPTION 3-3. Audio amplifier unit The demodulated signal is amplified by IC2 (2/2), and goes through a low-pass filter consisting of IC5 (11 21, a high-pass filter cons~sting of IC5 (2/2), and a BEF consisting of IC9 (112) to remove the unwanted audio signal. The signal the passes through the de-emphasis circuit consisting of the AF swi[...]

CIRCUIT DESCRIPTION 4. Transmitter System 4-1. Microphone amplifier The signal from the microphone goes to the The signal is applied to the IC212 summing amplifier nxcrophone mute switch (Q201 off). It then passes and mixed with QT and DQT from the CPU (IC209). It through the high-pass filter in IC205 (212) and the pre- then passes through the spla[...]

CIRCUIT DESCRIPTION 5. Frequency Synthesizer Unit 5-1. PLL The frequency synthesizer consists of a VCXO iXl), and a VCO circuit, PLL circuit, and peripheral circuits. The VCXO generates 12.8MHz. The frequency sta- bility IS withiri i2.5ppm (TK-940), i I .5pprn (TK-941) within the temperatdre range of -30 to 160°C. l~his output enters the PLL C (IC[...]

CIRCUIT DESCRIPTION 6. Control unit The control unit colisists of CPU )IC2091 and its peripheral circuits. It controls the TX and RX units and transfers data to and from the LCD assembly. The CPU has the foow~ng main functions: 1) Switchlrig betweeri transmission and reception according to the PT slgnal input. D/A converter IC6 is used as a convent[...]

CIRCUIT DESCRIPTION 6-4. PLL data output PLL data is output fronl DATA (pin 61 ), EIUABLE (pin 8c HOR 591, and CLOCK (p~n 60) of the CPU (IC2091. The sig- nas are input to the PLL IC (ICli when the channel is 01 3 changed or when transmission is changed to reception and vice versa. 6-5. Horn control 014 The horn switch, consisting of Q13, 014, and [...]

1) CIRCUIT DESCRIPTION 7. LCD Assembly ' The LCD assembiy consists of CPU, LCD, power switch circuit, and tone generator. 7-1. CPU The CPU (IC2) carrres out the folowlng main operatlons: It sends onloff data serially to the control unit from the AF volume control, LIPIDOWN key, system UP/ DOWN key, group UPIDOWN key, SCAlV key, and AUX key. It[...]

SEMICONDUCTOR DATA Level Adjuster : M62363FP (TX-RX Unit IC6) Block diagram VINB VouT8 Vour7 VlN7 GND RESET Vo~rrf Da VING VOUT~ Vou15 VIN5 18 17 16 I I I I I I I I I I I I I I I I 7 8 VIN~ VOUT~ VOUT2 VlN2 V00 LD CLK Dl VIN~ VOUT~ VOUTA v1~4 Audio Power Amplifier : LA4422 (TX-RX Unit IC11) Terminal connection diagram Block diagram DC BS IN OUT NFb[...]

I) SEMICONDUCTOR DATA EEPROM : AT24C02NlOS12.7 (TX-RX Unit IC201) Terminal connection diagram GND 7 b TEST Block diagram (8) Vcc - Terminal function I PI^ name I Functon Ser~al data Ser~al clock No connect GND - START STOP LOGIC SERIAL SCL - S DA - 41 O A2 A1 Ao O 1- .OUT CONTROL EN H.V. PUMPfllMlNG D LOGIC D + - LOAD @ 4- - DEVICE DATA REGISTER AD[...]

SEMICONDUCTOR DATA Microprocessor : 78312AGF3563BE (TX-RX Unit IC209) Terminal connection diagram -0 z~%%%S%s~7s3a%L%R~% P42lAD2 52 3 2 P43lAD3 53 31 P44lAD4 54 30 P45lAD5 55 29 P46lAD6 56 28 P47lAD7 57 27 Vuo 58 26 PO0 59 25 PO1 60 2 4 PO2 6 1 23 PO3 62 2 2 Po4 63 n 2 i vss 4 X2 4 XI M P33lCTRLl - P32ICll V PBIICTRLO - P3OlCIO Terminal function 3 [...]

SEMICONDUCTOR DATA Microprocessor : 75308BGK740BE9 (LCD Assy IC2) Terminal connection diagram P6 1 P62 P63 P70 P7 1 P7 2 P73 RESET S 0 S 1 S2 S 3 S4 S 5 S 6 S 7 S 8 S 9 S10 Sl I ommt-wm*mm-ommt-wm~m~- wmmmmmmmmmm********* 61 40 PO2 62 39 PO1 63 38 PO0 64 37 P53 65 36 P52 66 35 P5 1 67 34 P50 68 33 Vss 69 32 P43 70 3 1 P 42 7 1 30 P41 7 2 29 P 40 73[...]

SEMICONDUCTOR DATA PLL System : SC370651F or MC145190F-K (PLLIVCO ICI) Terminal connection diagram REFin Din CLK VPD OUTPUT A P; I_ :::PUT i3 Rx TEST2 TEST1 9 12 Vcc - fin 10 11 fin Block diagram DATA OUT 20 P REFln - OSC OR f R - 4 STAGE SELECT 5 OUTPUT A 1 DIVIDER LOGIC REFout - (CONFIGURABLE) 1 / N /3 / 13 DOUBLE BUFFERED * Bit GrabberTM R REGIS[...]

DESCRIPTION OF COMPONENTS TX-RX UNIT (X57-4590-XX) -10 : TK-940 -11 : TK-941 1 1 Ref. No. 1 Parts No. Use/Function OperationlCendition ( IC1 1 BU4013BF / Power supply circuit loglc control 1 Audio amplifier (Detected output) [i~: 1 NJM4558E 1 --- NJM78L05UA Voitaqe reuualtor 1 1;; 1 pPO8 Voltage regulator -- NJM4558E Act~ve f~lter lC6 ~62363~~ Leve[...]

DESCRIPTION OF COMPONENTS D 1 1 02CZ18iX.Y) I Voltage reference __--- L--- 1 D 2 ( DSA3Al 1 protection -- A Ref. No. Q201 Q202 PeveIse current preventon I Surqe absorption kwhen 5V or more and OV or less UseIFunction Muti~llch --- DC swlrch Parts No. DTC114Eup DTC144EU -- -- mexnce / Surae absorution On when 5V or more and OV or less. Operation/Con[...]

PARTS LIST I p CAPACITORS 45 220 J Capacitor value / '. 123 4 56 010 = lpF 0 = 22pF cc4(riq i 1 = Type cerarnlc, electrolyr~c etc 4 = Voltage ratlng 100 = 10pF 2 = Shape round, square, ect 5 = Value 101 = 1 OOpF 2nd number 3 = Temp coeff~c~enl 6 = Tolerance 102 = 1OOOpF = 0 00111F 1 st number 103 =OOI~F . Temperature coefficient Voltage rating[...]

Y New Parts PARTS LIST Par-ts without Parts No are not suDD1if.d. LLPS ?II'II~;I~S rion ~~ier~t,iorit~r?; Cliiri~ e Parts NO. ~IB son1 pas fo~~ti-nis T~eile otlne Parts No. wet-den ~ii?:tit geliefei't. L:Scandinavia K:USA P:Canada Y:PX(Far East, Hawaii) T:England E:Europe Y:AAFES(Europe) RAustralia M:Other Areas indicates safety critical [...]

x Iqpw Parts PARTS LIST Par-ts wltnoidt. Parts No. are not supplied. LC:; articles no'? lnslltidnll?~ clar~i Ir: Parts No, ne; Son(. pas fournis Teile ohnc Parts No. werden nicht geiefert. TK-940/941 TX-RX UNlT (X57-4590-XX) L:Scandinavia K:USA P:Canada Y:PX(Far East, Hawaii) T:England E:Europe Y:AAFES(Europe) kAustralia M:Other Areas Ref. NO.[...]

a, ffl co el c. c1 c, x 5, c 7; c 4K84-24 W 1 WWW Ct c' C.' C, m CI c, m c~ -'PIAX I C, - I - - 1 IPI OC8--;4P Kt cn CI 4 4 x -XC, 0 C) e' c C) ct .c X X C) 4 Kt 4 11 4 Clj I WWW 0 G CJ C' C' TJ CI m m cs I*-+= +PIId I I -PI 4 C, C, -1 C G cn r.2 4 C8 - 7;XT ct c c, c c' xxxC3C) 11 4 4 4 -1 WWWWW ?I C, Cf C.'[...]

w New Parts PARTS LIST Parts wthoi~t Parts No, are not supplied LC it; 'r I~JI cl:)il$ IIC Parts No. nc son[. l.,;:~ (ournls Teli: otme Parts No. w,.:i-clc:n rictil qc~lielert. TX-RX UNIT (X57-4590-XX) - L:Scandinavia PUSA &Canada Y:PX(Far East, Hawaii) T:England f:Europe Y:AAFES(Europe) X:Australia Mother Areas indicates safety critical c[...]

1rux .z ;> ,> 7 ': 1 z glzm s "u !2 - r 'a, 02 5 i ?X$m ,z g w ZZ" a ? 5 s: _ -2 -5 a ? 232 L 3 '5 m - ,.,> -2z -. ': 0, ; -' 7 , - cf cr> a -c T p -. ,T w & id * 7 L" +Z 0 ,--r rrrrr rrooo ~1 4 4 ci c, em , , , , , , , , C# c, C> c, C, c.. c, C% C: C C, c, C, C c, C C C C C C' c, C&ap[...]

i< Nev~ Parts PARTS LIST Parts without Parts No. are not supplied I es ill'11CI~:~S 11017 II~P!I~ ionnrs oans le Parts No. ne so1.11. 133s ro~,~-n~ I cii~? ohlie Parts No, wet-aer~ 1~11c;ht gel~~rrrt. 1 Ref. No. (~ddressl~ewl Parts No 1:Scandinavia K:USA .anada Y:PX(Far East, Hawaii) T:England E:Europe Y:AAFES(Europe) kAustralia M:Other Are[...]

x New Farls PARTS LIST Parts witho~t Parts No. are riot silpyJl!ed I-es sr-tlces non n~c!ntliCli~!::s flmc Ie Parts No, no sent pas fourr-,ls Tcile ot~rJe Parts No vvertleri riictlt gc!ll?lert. TX-RX UNIT (X57-4590-XX) ~~f. NO. @SF%+$ R3Y HA0 R41 , 42 HA3 HA4 R45 R46 HA7 HA8 RAY R50 RS 1 R52 RS3 HS 4 R55 ,56 R 5 8 R5Y R6U ,61 R62 H63 R64 H65 H66 R [...]

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LCD ASSY (638-0731 -05) Component side view LCD ASSY (B38-0731-05) Foil side view[...]

PLLIVCO (X58-4170-XX) (A/2) -1 0 : TK-940 -1 1 : TK-941 Component side view PLLIVCO (X58-4170-XX) (A121 Foil side view @REF GND VIN PLLIVCO (X58-4170-XX) (B12) Foil side view Component side Pattern 1 Pattern 2 Foil side[...]

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1, I Ref. No. I Address ( Ref. No. ] ~ddressl component side-+ i Pattern 1 Pattern 2 Pattern 3 Pattern 4 Foil side[...]

ITX-RX UNIT (X57-4590-XX) (B/2) Component side view -10 : TK-940 -11 : TK-941 -- --_ Ref. Nc IC201 IC202 IC203 IC205 IC20E[...]

Component side 1 O Connect 1 and 4 Pattern 1 Pattern 2 Pattern 3 Pattern 4 -- Foil side I I I I I I DTCI 14EU DTCI 44EU[...]

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L, I--- I Component side 2SB1 1 Pattern I Pattern 2 Pattern 3 -- Pattern 4 I Sidel I I i i I I I I ! I I I i 1 i I i i I .............. . 1. TX-RX UNIT iX51-4590-XX) 1112) Foil iide view -10 : TK-940 -11 : TK-941 .- i i i[...]

-- M N PC BOARD VIEW d 4 2 INPUT ICalel VIH[...]

TX-RX UNIT (X57-4590-XX) (AI2) Component side wiew -10 : TK-940 -1 1 : TK-941 , l2 13 14 ~oh~onent side I I I - -- --- . 75 I I I I I[...]

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Note) Ref. No. : Parts of pattern 1. TX-RX UNIT (TX-RX SECTION) (X57-4590-XX) (A/2) -10: TK-940 -11: TK-941 pLL/VCo (X58-417o-XX) - - - - - - - - - - - - - - - - - - - - - - 01 : DTC143EK **A1 :PLL (X58-4170-XX)(A/2) a2 : 2SA1586(Y,GR) 03.52,53 : 2SC3356 a51 : 2SK508NV(K52) Dl :1SS301 D51,52 : 1T363A D53 : MA360[...]

-- --.--- --- 7-, -- --- maow mod maon ~AIYO f L31Y. ZL31X.[...]

[V] TK-940 iL) .T<-941 TX-RX UNIT (X57-4590-XX) D 1 :OZCZ18(X.Y) 02 :DSA3Al 04.1 1 :1SS301 D7,9,10.12- 15 :OA204K D8 a16 Dl7 :OAN235K Dl8 :HSM88AS D19,21 :MI809 02C :MA4P1250 D22 :MA77 :DTA114EU :OX1 14EU :2SA1641 (S,T) :DTA114YU :DTA114TU :2SC4226(R24) :OTC144EU :OX3 14TK :3SK24 1 (R) :2SB1370 :2SC4094[R?7) E F) .DTA144EU :DTC 1 1 4YU 2SA1586(Y[...]

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------------------- 7 I:::: :AT24C02N1 OS12.7 :NJM78L05UA IC203 :HO74HC373FP :AT29C256-20TI :TC7S32F :78312AGF3563BE :TA75S01 F ccrl ASS'Y (DISPLAY S~ECTION) (838- -------- IC209 78312ACF3563BE[...]

Note) 0 Ref. No. : Parts of pattern 1. Eqqzj 10-11 JJP YES SC - RESET[...]