Kenwood TKR-840 Service Manual

Also see for TKR-840: Brochure & specs Instruction manual

TKR-840 CIRCUIT DESCRIPTION5.Control CircuitTh� control unit (X53-388) consists of the following circuits:(1) main CPU, (2) sub CPU, (3) DSP circuit, (4) AF PA circuit,(5) display circuit, (6) baseband circuit, (7) Microphone AGCcircuit, (8) RS-232C circuit, and (9) power supply circuit."' "' "'u :::! u"' "' �� .,.. .. 0:Rl62 - 0.. 0.. -Dl�X::,<�., :,: "' ..��"' � �iI SURGE J "' "'.. ..PROTECTORCNl (CK). CN2CCN1 CDT), CN2(N"';;;L6BEAT QS, IC18C8EAT)�}}'6II R194[ClO C187!VOLTAGE I j -- EPRDETECTOR CNl (!PR)f � PAG... IC30CRST)CH2(PAG}� LDRu GND l CHl(LDR)IClO RSTINUHTj OUTRl91�LJ;:,;u�- Rl9d3 Cl02[l� i 11 )( � -TESTCO)(l'-;t�0 Tu CN3(MOAT) MDATQl TEST!BEAT SHI FT I R337CK}, CN3(CJO, IC39CCK), JC33CCLK) CKOT), CN3(DT), JC31HDT). IC33{DI) DTCN6(hMONL D15, CN4CExM.0N) MONCNlCSC), IC49 SCD24, CN6( RPTT) RPTTD30. CN4 CAUX12) AUXl2CHECK c201_l C212 .....I�1100 I;;;:e "' � . ..l .. . ., �.. .. � � ..HSOC > <R197 LSDOR201 P92Rl99 JACKR200 EPRBYTECNVaaR202 PAGR203 LORRESETR204 Xoutv ..Xi nVooR158 NM!R206 MDATR205 TESTR207 MAINR208 CKR209 DTR210 MONR211 SCR217 RPTTR212 AUXl2R227 CHECK� �I: 0 ...25 u :;! u.. .. .,,26- "' ., .,m ;\gJ "'"' "' "'N N "' N "'.. .. "' .. .. ..;:;"' ;:; .J;. � 1,1 uIllr- CN3CH0K) i § ...u"' ;;: I!; e0 0 "'N z:,: "' � uC256 .... :::!--,��- i- u- VSS-JC35JMULTIPLEXER[5.1 Main CPUThe main CPU (IC17) is a 16-bit single-chip microcomputercontaining a 128k ROM and a 5k RAM. This CPU controls thesub CPU, the flash ROM, and the DSP, encodes high-speedand low-speed data, controls the transmitter unit, the receiverunit, the control unit, and the display circuit and sends data toor from an external device.�u"' iQ� >!'; uz "'u Q- IC7 1C30"' ;;; � !;: > "?:j u "' !<> : u u 0: ..<.. "' - .. .... - .. ., ., .,"' "' .., "' "' N.. .. .. .. .. ..., .. ... > 0' ,,0:�;I "'�(') �:"I"' ,_ � .:: �Q O O O Q Q O O � � �� :: g :;]- � OI � OI OI N� � � � �u u r•f '7 f 170 N "' .. ., "' ..I(') .., " 0:.. '.'! < 0: �0..�-�70N 75;; li: £> > � f Q 0 0 0 0 Q 0 .. R297� � u; .. ....> u u<!Cl 7I CPU I;.gj� ..<� .. .. l:i 0 u :;i .. 9• :,: • ,. . ,."' u 0' ' ': ' �., .. " <>fil .. "' .. ;':;; ., ., .,� � .. N N N "'"'"' .. .. .. .. .. "' .. .. .... "' E-< )-< .., "' "E-" 0. 0.. 0.. " u " !<..,"' u " 0: "' 0:< ;:: .. .. i .,0 .. e u B 1:e t "' - �"' "' z ., uz z uu u u ,.:< .. .,!; u@ ii uu..:! ;;; 0 "'"' <"' u u''.. ..., ., .,"' "' "'.. .. .."' ;;;0: "'"' u u;:: '0;\ �"'u .. ..-�lS R29B!AL R29Q!RD R300R301!WRCP3 AOAOp]r.:-:7 AlAl ·•·•·••••••• A2A2 ·•·•·•'--"-'-l A3A3CP4 A4A4 -. r.:-:7·•·•·• A5AS ·•·•••·•·•·• A6A6 i-JA7w'--"-'-l A7v ..7at r-AS -V0<,��Ag" ,.,.,. AlOAl0 ......All I-' i....;..;.;..J Al 1CPS A12Al2n� Al3A13•••••• A14AU ·•·•·•Al5 I-' '--"-'-l Al5CP7 Al6Al6 " r.:-:7, ...... A17mA17 ,,.,...51 AlB _< � +-50-IC15(G). JC16(G). !C46-JC7 (CE}..u••Fig.23 Main CPU36