Kenwood TK-940 Service Manual

800mhz/900mhz fm transceiver

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Instruction manual (18 pages)

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Page 1 800MHz/900MHz TRANSCEIVER SERVICE MANUAL O 1994-8 PRINTED IN JAPAN 121 9 B51-8281-00( N Microphone ................'~'\,'.'- "!?$LU~CO :;..:.:.$@$::' : , BLOCK DIAGRAM .i@&4170-XX) ;a., ...." ........... LEVEL DIAGRAM :FX-R%~?ONIT 1x57-4590-XXI (BIZ) ..
Page 2 If any i t e m is missing, However, it is recommended that recerver and trans- please contact KENWOOD immediately. mitter operation be checked for proper operatron be- fore ~nstallat~on. LICENSING REQUIREMENTS Federal regulations require a station license for each 3-2.
Page 3 Your KENWOOD dealer can help you select cable runs for protection against pinching or an antenna system that will best serve your particular g wiring, and radio installation t o prevent,over- needs.
Page 4 SYSTEM SET-UP Merchandise received Frequency range (MHz) RF power Type License and frequency allocated by FCC 806-825 TK-940 K 851 -870 851-870 896-902 TK-9,41 K Choose the type of transceiver 935-941 935-941 See page 16. Modify the control unit when used KDD-4.
Page 5 OPERATING FEATURES Transceiver Controls and Indicators (Fig. O p e r a t i o n F e a t u t e s Font Panel Controls 2-1. The TK-9401941 s an 8001900MHz-band EFJ LTRIM- All the keys on the front panel ale momentary-type compat~ble trunked ladlo deslgned t o operate In both trunked and convent~ona modes The programmable push buttons...
Page 6 OPERATING FEATURES Group display AUX key This key toggles the auxiiiary function on and off. If Shows the selected group rlumbei (1-MAX 250) this key is pressed once, the auxiliary function is en- Zero ~ndicates group 10 Only the programmed groups are d~splayed The group d~splay 1 s located above the abled.
Page 7 OPERATING FEATURES 3-2. System Lockout Alphanumeric display (NN) The system lockout feature used t o lock systems The 8-dig~t alphanumerlc display also shows out of the scan sequence, and can be selected b y pro- system and group numbers. 8-digit alphanumeric displays can be programmed for each group.
Page 8 OPERATING FEATURES 3-9. Priority ID Codes 3-5. SystemIGroup Revert The priority of the programmable decode ID codes SystemIGroup revert can be programmed for one of for each system is as follows: the following: 1) Fixed ID code 1 F~xed ID code Last call revert 3 ) Selected ID code The system or group changes t o the revert system...
Page 9 OPERATING FEATURES 3-17. Preferred System Revert 3-13. Free System Ringback Thls feature is avalabe only when a telephone inter- This feature is available by assigning this feature to > connect ID code selected. If a busy tone sounds the AUX (Aux~liary) key The feature is used to move when the PTT button pressed, the transceiver enters the revert system/group to the fixed programmed sys-...
Page 10 OPERATING FEATURES 3-19. AUTO TEL Delay tone A telephone interconnect call can be made by sim- T h ~ s tone is output when the P n 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.
Page 11 OPERATING FEATURES The KDD-4 can be set with the decode ID of each 3-22. Conventional System Operation group. If it is supporled, the following features are Up to 250 (MAX) channels can be programmed for available: each system programmed as a conventional system. Channels can be selected by the group key.
Page 12 OPERATING FEATURES 3-25. System Scan Type 3-24. Horn Alert Fix system scan Horn alert can be set to on off for each group AII the set systems except locied-out ones are Elther cont~nuous or can be non-continuous operation If the DELIADD feature asslgned t o the set by the FPU scanned...
Page 13 OPERATING FEATURES 4. Transceiver Programming 4-1.lntroduction The TK-9401941 programmed uslng an transceiver I B M 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.
Page 14 OPERATING FEATURES 4-5. Clone M o d e (Figure 51 5. Description of Each Modes Programmed data is transferred f r o m one 5-1. Dealer mode transceiver t o another by using a microphone cable. To enter this mode, hold down the GROUP UP key, Connect the master set to the slave set with.
Page 15 Area : 0. Goto : 12, Home down for t w o more seconds. The display changes Table 2 (TK- from "TUNING" to "800MHz" (TK-940) or "900NIHzU 941), and then back to the systemlgroup number AUX key indication. When the AUX key is pressed, talk-around is Select the frequency to be adjusted by pressing the enabled (the "TAN indicator appears), and transmission...
Page 16 INSTALLATION 1. Installing the Signaling Unit (KDD-4 D'TMF : Option) KDD-4 1-1. assembly Solder the 9-pin leads with connector to the KDD-4 board locations designated w i t h t h e unit specification numbers. (Fig. Fig. 1 2. Put an insulating tube around the KDD-4 board and heat it so that the tube encases the board.
Page 17 INSTALLATION 1-2, Installing the KDD-4 in the transceiver I . Remove the t w o halves of the case transceiver and the control panel. ( F g . Fig. 3 2, Install the KDD-4 on the TX-RX unit (B12). (Fig. 4) 1) Attach the pad to the KDD-4 2) Plug the KDD-4 connector into CIV203 of the TX- RX unit (BIZ)
Page 18 INSTALLATION 1-3. Setting the KDD-4 code (DTMF) This product b u ~ l t using surface mount construc- tion techniques. The solder jumpers used t o configure this product should be changed using equipment-and MONIRESET > ON-HOOK OFF-HOOK techniques suitable for surface mount device repair. Shorted Open c ~ r c u ~ t Abuse due t o the use of inappropriate tools and tech-...
Page 19 INSTALLATION Insert t h e KCT-19 cable into the chassis 2-1. Terminal function ( 0 ) The wire harness band m u s t be inside the No. (A) No. lB,C,DI Narne Function chassis. A- 1 M C hook input ( 0 ) .
Page 20 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 key. If you use the Horn Alert function (KDD-4 requ~red) or the Manual Relay function, you can turn the function off while driving with the ~ g n i t ~ o n key.
Page 21 INSTALLATION 4. External Speaker 4-1. KES-3 : Option The KES-3 an external speaker for the 5-mm- dameter speaker jack Connection procedure I. Connect the KES-3 to the 3.5-rnm-diameter speaker jack on the rear of the transceiver. 4-2. KES-4 Option The KES-4 is an external speaker used w ~ t h the accessory cable.
Page 22 INSTALLATION 5 . Fitting the Control Panel Upside Down The TK-9401941 control panel can be fitted upside d o w n , so the can be niounted w i t h ~ t s transceiver internal speaker (in l l i e upper haif of the case) facing down in your car 1 .
Page 27 PLL t o produce the first IF of 45.0375MHz (TK-940), 39.0375MHz (TK-941). This is then mixed with the 44.5825MHz (TK-940), 38.5825MHz (TK-941) second local osclllator output t o produce the 455Hz second IF. This is detected t o give the demodulated signal.
Page 28 CIRCUIT DESCRIPTION 3-4. Squelch circuit 3-3. Audio amplifier unit The detector output is amplified by IC2 (212) and The demodulated signal is amplified by IC2 (2/2), passes through a high-pass filter consisting of IC204 and goes through a low-pass filter consisting of IC5 (11 21, a high-pass filter cons~sting of IC5 (2/2), and a (2/2), which removes the noise components from the signal.
Page 29 CIRCUIT DESCRIPTION 4. Transmitter System 4-1. Microphone amplifier The signal f r o m t h e m i c r o p h o n e g o e s t o t h e The signal is applied t o the IC212 summing amplifier nxcrophone mute switch (Q201 off).
Page 30 (In I C l ) and low-pass filter, and on to bility withiri i 2 . 5 p p m (TK-940), i I .5pprn (TK-941) within the temperatdre range of -30 to 160°C. l ~ h i s the varactor diodes (D51 and D52) in the VCO unit, keeping t h e VCO frequency c o n s t a n t .
Page 31 CIRCUIT DESCRIPTION D/A converter Control unit IC6 is used as a conventonal semi-fixed-resistor The control unit colisists of CPU )IC2091 and its converter It sets the following: peripheral circuits. It controls the TX and RX units and 1) Reference oscillator frequency transfers data to and from the LCD assembly.
Page 32 CIRCUIT DESCRIPTION 6-4. PLL data output PLL data is output fronl DATA (pin 61 EIUABLE (pin 591, and CLOCK ( p ~ n of the CPU (IC2091. The sig- nas are input t o the PLL IC ( I C l i when the channel is 0 1 3 changed or when transmission is changed to reception and vice versa.
Page 33 CIRCUIT DESCRIPTION 7-3. Tone generator LCD Assembly The beeps and alert t o n e s are generated by The LCD assembiy consists of CPU, LCD, power combining square wave signals of about 700Hz, switch circuit, and tone generator. 900Hz, and 1500Hz generated by the CPU These signals are output from pins 46, 47, and 48 of the CPU 7-1.
Page 34 SEMICONDUCTOR DATA Level Adjuster : M62363FP (TX-RX Unit IC6) Block diagram VINB VouT8 Vour7 VlN7 RESET V o ~ r r f VING V O U T ~ Vou15 VIN5 V I N ~ V O U T ~ VOUT2 VlN2 V I N ~ V O U T ~...
Page 35 SEMICONDUCTOR DATA EEPROM : AT24C02NlOS12.7 (TX-RX Unit IC201) Terminal connection diagram Terminal function PI^ name Functon Ser~al data Ser~al clock TEST No connect Block diagram START STOP S DA LOGIC SERIAL CONTROL H.V. PUMPfllMlNG LOGIC LOAD DEVICE DATA REGISTER ADDRESS COMPARATOR LOAD DATAWORD...
Page 36 SEMICONDUCTOR DATA Microprocessor : 78312AGF3563BE (TX-RX Unit IC209) Terminal connection diagram z ~ % % % S % s ~ 7 s 3 a % L % R ~ % P42lAD2 P43lAD3 P44lAD4 P45lAD5 P46lAD6 P47lAD7 v s s M P33lCTRLl P32ICll PBIICTRLO P3OlCIO...
Page 37 SEMICONDUCTOR DATA Microprocessor : 75308BGK740BE9 (LCD Assy IC2) Terminal connection diagram o m m t - w m * m m - o m m t - w m ~ m ~ - w m m m m m m m m m m * * * * * * * * * P6 1 P7 1 P5 1...
Page 38 SEMICONDUCTOR DATA PLL System : SC370651F MC145190F-K (PLLIVCO I C I ) Terminal connection diagram REFin OUTPUT A : P U T TEST2 TEST1 Block diagram DATA OUT REFln OSC OR SELECT OUTPUT A 4 STAGE LOGIC DIVIDER REFout (CONFIGURABLE) DOUBLE BUFFERED Bit GrabberTM R REGISTER 16 BlTS...
Page 39 DESCRIPTION OF COMPONENTS TX-RX UNIT (X57-4590-XX) -10 : TK-940 -11 : TK-941 Ref. No. Parts No. Use/Function OperationlCendition [i~: 1 BU4013BF Power supply circuit loglc control NJM4558E Audio amplifier (Detected output) - - - NJM78L05UA Voitaqe reuualtor Voltage regulator p P O 8...
Page 40 DC swltch DA204K Surge absorption D201, 202 On when microphone mute on D203 1 SS301 DC swltch PLL/VCO (X58-4170-XX) -10 : TK-940 -11 : TK-941 UseIFunction OperationICondition Ref. No. Parts No. SC370651 F PLL system Or MC145190F-K On when PLL unlocked...
Page 41 PARTS LIST CAPACITORS Capacitor value 010 = l p F 22pF cc4(riq Type cerarnlc, electrolyr~c etc Voltage ratlng 10pF Shape round, square, ect Value 1 OOpF 2nd number Temp c o e f f ~ c ~ e n l 6 = Tolerance 1OOOpF 0 00111F...
Page 42 Pfi b 2~ %& gl r TK-940/941 AU'I - I 0 6 5 - 0 3 M h T A L L l l L A b I N E T ( U P P E H ) 1 0 6 6 - 0 3...
Page 43 U N I T ( A / 2 , 6 / 2 ) Y 4 1 TX-RX UNIT (X57-4590-XX) -10 : TK-940 -11 : TK-941 C C 7 3 C C H 1 H I 0 1 J C H I P C...
Page 44 e' c t c t c c c' e' c c o e l c. c 1 c, . c X X xxxC3C) - 1 . l h j . 4 K \ 3 4 4 4 - 1 4 K 8 4 - 2 4 w w w w w W W W W W W W W...
Page 45 PARTS LIST New Parts wthoi~t Parts P a r t s No, are not supplied ; ' r Parts No. son[. (ournls cl:)il$ l . , ; : ~ otme Parts w,.:i-clc:n TX-RX UNIT (X57-4590-XX) Teli: rictil qc~lielert. A d d r e s s P a r t s No.
Page 46 1 r u x c . . ,> ; > r r r r r r r o o o C > C, C C C C C C ,--r h ) r ; Z Z Z Z Z Z Z Z K , C , K , K , K >...
Page 47 PARTS LIST N e v ~ P a r t s i< Parts No. P a r t s without a r e n o t supplied Parts N o . ne ill'11CI~:~S 11017 ionnrs oans so1.11. r o ~ , ~ - n ~ I I ~ P ! I ~ 1 3 3 s Parts No,...
Page 48 PARTS LIST Farls Parts No. P a r t s w i t h o ~ t are riot silpyJl!ed flmc Parts I-es s r - t l c e s non No, no sent pas fourr-,ls n~c!ntliCli~!::s TX-RX UNIT (X57-4590-XX) Parts Tcile ot~rJe vvertleri...
Page 67 LCD ASSY (B38-0731-05) LCD ASSY (638-0731 -05) Foil side view Component side view...
Page 68 PLLIVCO (X58-4170-XX) (A/2) -1 0 TK-940 -1 TK-941 Component side view @REF GND PLLIVCO (X58-4170-XX) (A121 Foil side view PLLIVCO (X58-4170-XX) (B12) Foil side view Component side Pattern Pattern Foil side...
Page 70 component side-+ Ref. No. Address Ref. No. ~ d d r e s s l Pattern Pattern 2 Pattern 3 Pattern 4 Foil side...
Page 71 ITX-RX UNIT (X57-4590-XX) (B/2) Component side view -10 : TK-940 -11 : TK-941 Ref. N c IC201 IC202 IC203 IC205 IC20E...
Page 72 Component side O Connect 1 and 4 Pattern 1 Pattern 2 Pattern Pattern 4 Foil side DTCI 14EU DTCI 44EU...
Page 75 TX-RX UNIT iX51-4590-XX) 11\12) Foil i i d e view -10 : TK-940 -11 : TK-941 ....Component side 2SB1 Pattern I Pattern 2 Pattern 3 Pattern 4...
Page 76 PC BOARD VIEW INPUT ICalel...
Page 77 TX-RX UNIT (X57-4590-XX) (AI2) Component side wiew -10 : TK-940 -1 1 : TK-941 ~ o h ~ o n e n t side - - -...
Page 79 Note) Ref. No. : Parts of pattern 1. TX-RX UNIT (TX-RX SECTION) (X57-4590-XX) (A/2) -10: T K - 9 4 0 -11: TK-941 - - - - - - - - - - - - pLL/VCo (X58-417o-XX) **A1 :PLL (X58-4170-XX)(A/2) : DTC143EK 2SA1586(Y,GR) 03.52,53 : 2SC3356...
Page 80 7 - , - - - m a o w m a o n m o d ~ A I Y O f L31Y. ZL31X.
Page 81 TX-RX UNIT (X57-4590-XX) :OZCZ18(X.Y) :DSA3Al TK-940 04.1 :1SS301 iL) .T<-941 D7,9,10.12- 1 5 :OA204K a 1 6 D l 7 :OAN235K D l 8 :HSM88AS D19,21 :MI809 :MA4P1250 :MA77 :DTA114EU : O X 1 14EU :2SA1641 (S,T) :DTA114YU :DTA114TU :2SC4226(R24)
Page 83 ------------------- I : : : : :AT24C02N1 OS12.7 :NJM78L05UA IC203 :HO74HC373FP :AT29C256-20TI :TC7S32F :78312AGF3563BE :TA75S01 F ccrl -------- ASS'Y (DISPLAY S~ECTION) (838- IC209 78312ACF3563BE...
Page 84 Note) Ref. No. : Parts of pattern 1. Eqqzj 10-11 RESET...

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Kenwood TK-940 Service Manual

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