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Kenwood RTX Manual

1. 76 SERVICE N ANUAL 1 Reading the Servioe Manual 80 2 Rules for Parts Lists 81 3 Adiustnent 83 lM Thursday December 25 1997 9 57 PM lt c INDICE MAIIUALE RICETRA SMITTEI TI Page 7 of 8 i T i i Y 5 Functions of Commnents 85 86 I 2 TS 950S SD Final Transistor 4 TS 940 Uplock 95 TS 790 ADDITIONAL INFORN ATION 2 Measuremept 1 How to Estimab the Voltaei 96 87188 6 Rules for Naminii Terminds 89 7 Reading Level Diagrams 90 Thursday Deqemb r 25 1997 l0 08 PM t o INDICE IvIANUALE RICETRA SMITTENTI 2 How to Measure the Radio Hieher 1 96 Ailab4f 96 Spurious 97 Page 8 of8 5 Ch ok the Chrac eristicsof the Band Pess Filter With the Spectrum Analwer Thursday December 25 1997 9 57 PM wbu IJ at n J n f eur A ko amp l POWER SUPPLY URCUIT Trouhleshooting the power supply clrcuitl 1 Powsr is Not Tumed 0N lFor modelg contriniry rn AC poryff supplyl Setup Connect the AC power cord to the set 1 Turn the power 0N and OFF quickly Did the internal speaker buzz YES The AC primary line is 0K Go
2. I Fcprlr proccdrrc NBZI l Does the NB2 switching circuit oulput any pulses NG2I 2 Does the wavgform shaping circuit output any pulsesT llCE 3 Does th6 NB2 noise detection circuit output any pulses D amp ll forSl al xrlNc GA E 2 Notch Circ git There are two typ s of notch circuits AF notch and RF ndch I AF notch llr I I I I I vna io r6ilTl ro a oattcT oauil ort I I oa t l J auttairp to I Troublcrhooting The output terrninals of the optical magnetrc and conl8ct tlrpe gncod rs are shown below vcc lsv 8Vt EN1 EN2 GNO The encoder does not r rork ls the following pulse output from the ENI and EN2 output torminals of the gncod rwhen it is turned lf not the detectaon circuit may be dafective lf the 5V power is not supplied or the GND as not effective the oulse is not output 2 Do the ENI and EN2 duty retbs differ much when tuming the encoder Example Optical 5V EFTI SV Et 2 ln this case the EN2 duty ratirc is wrong Adiust h to 50 5O The adjusting variable reeigtor VRl usually is in the encoder unit tl the duty ratio of a magnctic or contrct type cncodcr is wrrrng the encoder mutt be replacad 3 Chacking procedure tf the optical encod r does not output the following vwveform ThE waveform rectir rcation circurt on the encoder board may be defective 4 Some initiel nrcdels of optical encoders may not work if the encoder pulse phase
3. Set En amarour band frequency Cooneet the ent nnB of the s t to a clummy load 1 Press tho SEND or PTT swrtch Does ths SS line go LOWT V rify that the SS line becomes 0V or ths miqocofiputer input pin Exrmplo olT5 o60 2 ls any voltage applied to the TXB on th lF or RF board ll no oltege is apptl d to the TX8 ls the transistor that generates TXB defoc lve The transistors that procl uca powcr supply vohagce arc of 2SA or 2SE type lhcy may lalt e lly ll the o r ua lc grounded lJ a transistor hes feltd chr wheahor its output hes boan grovndcd be orc replacing the trenslstor lf you omh th s check msny tantistoro may feil Ouring recqption 3 Does the ransistor that controls the TXB gensretion work propeiy 4 Ch ct tho UL detection cirqrir voltage ON aol lt TRX borrd opcrdon _E_ TFX tx59 368O Ott oFF 1 TrenmircSon lr lmposiblc The 8XB and TXB vollages are the same as tho corhrnon powersupply volteg O 950 tSV T 890r 8V TH 28 5V 8V is taken here bscause it is usd by many rnodels l 1 Doesrh TXB changeT RX 0V TX 8V 2 Oossthe SSchsng RX 8V TX 0V 3 Doesth CSSchange RX 5V TX 0V 4 Does the transistor that genomtes TXB work properly NPN rransistor Ths base goes HIGH PNP rransistor Tha bas goes LOW 5 Doss tha transistor lhat nrols rh TX8 generation uork properly tl it is modularized check the CTXB 6 Does lhe microcomputer issuc r transmi
4. and SCAN keys and turn the powar switch ON Turn the MCH FO CH and adiust the S meter in menu 2 Write dEta into the EEPROM Press tha UP key in menu 17 once Data wriring is completed Press the CLR key once to lerminaE the edjugtrnent mode To adjust tha S meter at toMHz as well TS 90 Adiust t in e samg vf y as lor 28MHz use rnenu No 10 1 r Ts lxtosDx To recall the mamoryfor adjustment 1 Hold donn th6 t and 7 keys and switch the power oN 2 TS 9SOSDX entars the adiustrnent mode and the adjustment frequency is written into the memory channel How to adiust without clearing the memory cont nts 1 Hold down the 3 and 9 keys and swdch the power ON TS soSDX antors the adiustrnent mode 2 To chango the trequency turn the rnain encoder or pressthe ENTER key Use rhe M CI WFO CH controlto change tho m nu 3 Press the CLB key once to wrate data into the EEPROtvl 4 Be sure lo press tho CLR key aftercompletion of the adjustment r TS50 The adiustment frequency is not written into memory When the adiustment mode is entered and a nrenu is specified the adiuslment frequerry and rnod are set forcibly To ant r ths adlustment mgde 1 Hold down the NB and MHz keys and switch the power ON 2 Press the UP or DOWN kay in menu No AD When good is displayed data writing is completed t3 The adjuanant proc duraa far ncrly modets may b changeel The mein dvantagq of Jhis adiustment mode Ie that the md
5. d The standard is not conformed to cannot be adjusted etc lf you are not cer in what is wrong see rhe voftage adiustment section ll shows the important vollages for operating the set prryerly The parts such as band pass filters with slandardized waveforms do not need to be adiusted A spectrurn analyzer is required to adjust them accurately and if the wayeform veries e littl it does not sffect the performance A problem may occur if you try to adjust them lespeciaily rhe PLL band pass fiher Check the mode and frequency when adjusting the lock vohage Whan adjusting the frequency check the mode f requency frs n srnisston recept Dn WIDE NARR OW CW p cn VBT SLOPE ruNE end tF shift The zero adiustment procedure of the S meter depends on the model Sorne procedures are complicsted especialV the TS 50 seriesl but thera Ere reesons for them as described in the manuels Perform zero diustment as instructed in the rnanuals The lrangmission voltage adjustment is described before or after rBception adjustment The ALC reference voltage is very important for adiusting transmissron See the reference loltage adiustment s ction to repair the transmitter When adiusting the drive rnake the 1ig shown betow and connect it ro the DFV terminal Do not connect the iig to the final OUT Otherwise it wiil fail immediately after the powsr is boosted t0OO x 2 lw The final bi6s rnerhod directly measures the current
6. i k r n iiFitFatStIttEEiii 68 7 T 440 PLL Chcd polnt3 O Check lh lsvelwith an ogcilloscope A Check the voltage with a digital voltmeter B Base E Emitter C Collector S Source Number Pin number aIIIIIIaIa I I I I I I I I I I I I I IaaaI Ia IL 6f 8 TS 440 Lr3t Loop Checkpoint O Check the levelwhh an ccilloscope A Check the voltage whh a dighel vottm ter B Base E Emitter Number Pin number AF UN f PLL I I IT Aan r lt ttt A OUT hqn f tJf l I I I I I I I t5 9 Ouick Ghart of PIL lC lnput Output Pinr R Refurence frequency input U UL deteaion G Ground D Data line C Comparison frequency input O DC OUT V Power supply F O Frequency out ooc D6 fl ta0T9 o Vi DDOi O 19 64 1964 TSdr G B VOU ls fi ts ao f6 t vi c ooo ucra ntP c vo6 uc n9 ca0 t 97rr 71t trt slrllna vci o uc TkTW lcfltAP ouv icc rn gru nB ffi t voGuG fw4tn fs g 7S 0 vo KCI o XEH 6s3qa1g Gt tt KcH t2 tn r r iGOg tFt20 f amp tto tlt tQ t amp eil DDO Gem I5 r2 l oaoooo aoo vuooo o r ova o fHat fH4g C ODO G l 21 o voouc f 9 r0 ls 7ffi tn mr TS 7 I L rS Et t lltt 2t t UC MCrSrsrP l G tn L7 Or lM z1ro 6GtV C U rs osDr ls tg oDo c t 27 I Elo fH65 F 9 66 10 PLLI of Moblle and HandyTranecclvcnr I Eramplr lTl 26l A single VCO os
7. 8V The base vohage is 4V hatf the collector voltagp When the NPN tnansisor is ON the VBE roltage betw en the base and emitterl has a potential differance of 0 61 end the base roltrge increases The ernitter voltag is obtained by subtracting 0 6V lrom the base voftage 4V 0 6V 3 4V 0 3 to 0 5V is subtracted from each voltage in cusideration of tha voltage drop effected by the 1O0 ohm rasisbr which was nored et the end Base loltage 3 6V Collector voltage 7 6V Emittsr whage 3 0 V Tha voltages w re estimated as abole Such rough ca lculation prooedures are suff icj ently usaf u l 7 100r t6 I Trancistorc Connect thg volt rrcrter as frollows lf there is a potental difference of 0 6V the transistor as ON 1 Fix the red probe to the base with the xt range of lh test r 2 Meesure the resistance betwsen the bage and collector 3 Measure thg resistance bEwveen the base and eminer 4 Applv the rod grobe to rhe collector while snaching the b lack probe to the mi er 5 Measure the resistance between the coll ctor and emifier 6 Fix the black probe to the base 7 Measure the resistance between the base end collector 8 Meesure the resistance between the b 6e and ernitter 9 While attaching the red probe to the mittet apply th blsck probe to rhe cotlactor 10 Measure thg resistance between th collector and emitter l the tester pointer rnovgs twice tho transistor is OK
8. AF unh 10 Sse tie PLL roubleshootang s ction 11 lCl 1 is iound to bo del stiv 3 Recoivrl S mithrity 1r low Us a ssnoifvity check ib Use another set that can be usecl for corrparison il any to find a problem lf the sensitivity is lower than SdB it is diffrun to fird thc problsrn without using a set for cornparison lf rch a sst is not avaibbte by referring to the l r l diagram c Manual lThe tevel diagram shoutd be used for intonnation only The manuel sho vs the values of the des tgn samdes and pr ploduced sefs Th6 des En and the lot l diagrarn may be cheng d durirlg mass production l Tho levcl diagram is explaincd in dctail in the Rccding t he gcr racc mlnurl sec tion on page 90 taking the TS 6i0 as ao erompto 22 j 4 Thc Rocrgalon Fngonoy Errfudot nd Thc Reocption Tonc irUlhong f Thr rrcrfion nooo ftrch tnr h 3gB Thor6 is a possibilityol g or h her the PLL bck is not sta6le Eeder to rhe PLL unlock sect on a T cinh0 lcrfrd amp t3 proUtm Apfly dtc ccl oecope p obe to the adirrsting points ftr tm PLL lock vohage and obsen c o r r idm Occillrorcopc sotup VOLT DM f lardlrxm scnsitivity lnprrt AC TIME D V Ahout trE NG 1 ll all the tcsr poirit are OK Check fhc lC UL detgction tcrminet in rhe gsrne way 2 It the UL detection t rminal is OK Th terminal can be chccked by using SSGs as lollows f t n o SSGs gre a railable Conncct one
9. MlN MICVR MlN SEND ON Chack the base voltage of the dfiver rnd porrv t traBistor in e fin l unit lf it is 0 61u or higher t le transistor bias is OK 2 Adiust tfte transmigsion frequenoy charaqterlstics fiunlng The 2TONE trBquency is tlifferent from rnodet to rnodel Thereforp the adiustment p ocedure dapends on modols Adiusr the trunsmission frequency charactsristics G instn ct d ln the rnanual Por rlr mdarot ss tPrn GNDIME Mrc 4 re mi l M wltofi tbo l grrll tcl A T Tll8tll rc t3 Dcfcstlw PLL lf the rnodulatlon rcne is not stabl6 suspect th PLL Refer to the PLL section on page 59 lf the TgfO r ocpti n BPF RFl diode faits modubtbn cannot bc cr cut d proporv 11 Powcr Fluctu tlon f ArC voltego flucilurtlon Oscilloacope VOLT DIV 20mV SWEEP DIV 5rnr AC input Chec the AC lioe I Porru rupgly volhgr ffuctuetlon Oscilloscap Same as above Check the pq vsr suppli s fiXB C 8C etc l 8t produce ALC I Gtdrr hvolf uctrrdon Oscilloscope VOLT DIV 0 5V Check th ca aer input l l el and Do thcy fluctuate bcal signal level Foor llnrl bord prnrnr coniact The TS 930 and TS 40 linal boad s have a poor contect via hdes Soldor lhe oomponent and solder ct sictss of ths board apln mr l PF ortl ix rolry corn Gt lf thc transrnission LPF relay is doiastive ctange thc trancmission band and chsck wheth r tha syfnpto Yl still pe6i9t3 Chock ths 3ign l li
10. Reset rhe microcomputer r lt reverts to th6 initial status HF 14 0MHz USB VHF 144 000MH2 CW l45 O00MHz FM UHF 430 000MHa CW X tl40 O00MHz To receivs these signals set the SSG freguenc y as follows HF 14 0OlMHz 4OrtBp VHF 144 000MH2 40d8p 145 0MHz 4OdBlr MOO ONI UHF 4 0 000MH2 40dBp K 440 000MHa 40dB MOD ONI I trth dgnelr are rcoohnd PLL dee b normal The display deta line is defective The display drive lC is defoctivo The displey is defectivc I ll rlgnds re not rrcrlvod The microcomputer does not work Reset the transceiver Refer to the gwet is not turned ON section on page 8 ll a ROM socket is used to instell the ROM rernove the gocket fom the boanl and solder the ROM directly to the board Replace the midocomputer FAM and FOM lC in this order 6 KryrErc NotAccopted ls the F LOCK switch ON Turn the Bncod r Beset the transceiver I ll tlrr trarcclvo b not ltc t 1 Unplug the power cable with the po rer swirch ON Remove the batt6ry 2 Hold dovvn the reset key and plug in thc power cable Reinstall rhe battery 3 Resel lhe ransceivsr 4 Check ths microcompuler or l0 lCs lf rh6r is a spare board use it to replace the board Other b rds may be defective I lf tho lilnaccilrcr 13 raaat 1 ls any special function indicator shown on the display lExample RlT XlT MHz e mode oth6r than USB 2 lf such an indicator is displayed The key conesponding to the indicato
11. Set the ssG frequency ro 73 05MH2 lF frequencyl Connect the lg 10 the L59 input Vary the SSG output so that ths AF ourput becomes 0 63V lf the gein is 21dB 1dB 1 4dB 7dB The mixing loss is 18 5 12 61 accorcling tolhe levetdiagram Therefrore the mixing is OK lf tha SSG frequency is changed to the lF fuaquency to check the lF stage the received AF tone may change However if the N frequency is 80OHz to 1 5kHz continue measutemena If the AF freguancy ls lncorrecli finc adjust ths SSG frequency so that ths tonc b the same as thet before mixing tor tlte 90 t Ol3 gain 33 2 16 5 16 7d8 according to the level diegraml Measure the actuel value with a iig lf the mcasursd g in is tTdB t 3dB it is probabty OK lf thers is a large difference betweeo lho actual rn asursmgnt and tho gain shown on thg level diagram check the circuit FM rransceivers Tho SSG output wilh 1zdB SINAD is shown on the level diagrarn I Howto converi lrvclr The LO t level corresponds to 0 85vrms at Lgs OUT lt corresponds to th peak vslue of about 1 2vtr p on the oscilloscope lt b useful to us tho Vpp units whan mersuring it wilh thc osciiloscop lVrmsxl 4l ltvtrpl Example lf LG2 is 0 43Vrms 0 43x t 41 0 806 trp Simple conversion method of dBm 1 R Adlh RF VTVM 2 To conven OdBm to Vrms F6ad the scale on the range changeover switch 0 3 r 0dBm range Here suppose that the pcrinter indicatos zero
12. The adjustment frequency is automatically read into th mcrmory channel How to adiust without clearing the memory contEnts 1 Check and adjust the frequency and mode lor items 10 bs adiusted Exampla l CAB POINT CH39 fla 2OOMHz USB Setth s ttoVFO A or B tospecify 14 200MH2 and USB Switch the fiher from 8 83 to 6K and from 455 to 2 4R Turn the power switch OFF Entet the sdiustment mode Hob down the AlP XlT and SCAN keys and turn the power switch ON Turn tha MCHi FO CH and adjust the items in rnenus 11 and 12 3 wdte dare into fie EEPROM Press the UP key in menu 17 once Data writing is completed Press ths CLR key once to terminet the adjustment mode Example 2 S rn ter CH07l14 1OOMHz USB Set frequency 14 1O0MHz Mode USB Filter switching 8 amp 6K 455 2 4K SSG frequency 14 101 MHz MOD OFF 1 Turn the power OFF Enter the adjustment mode Hold down the AlP XlT and SCAN keys and turn the po rer switch ON Turn the MCH ryFO CH and diust th6 S rneter in menu 0E 2 Writs data into the EEPROM Press the UP key in menu 17 once Data writing rs completed Prass the CLR key orce toierminate the adjustmsnt rTpda To adjust tha S meter at 28MHz as well Example 3 S meter CH09 8 800MH2 USB Set requency 28 800MHz Model USB Filter swhching 8 ff1 r 6K 455 2 4K SSG frsquency 28 801MHa MOD OFF t Ttrrn the Fwer OFF Enter the adjustr ent mode Hold down the AlP XlT
13. The Al F gat occerlvely lrot The AVR transistor normally gats very hor So it us s a h at sink to dissip t heat but it rna gt t too hot to touch the hear sink Chock the coollng fan opcratlon lf anyl Wa m the th6rrnistor THl with 6 dryer or sold rirE lfon lf the fan runs th cooling tan ls OK lf not the rnobror the tempen ture det ction circuit is defective To rlch bolrd Swltdr by connaolo s How to idontlfy e defective thermistor Warm th thermistor to th temperature at which the fan moror siarts running Thsre ere two t s of motor driv circuits A 1ypc lf the motor ground voltaga drops the datection circuit is OK The motor rs considered dafectivo B tyge Unplug the connoctor end measure the voltag at the positive side ol the motor tf Vcc is present the detection circuit is oK The rnotof is considered defecriw A type From lho lcmparttu a datactloa daqrh B type F om th ttrnpafduna datrction citcult 13 DC IN Touch the lrun8lstors or lcs fo land tho hotlo t one lf you find a componcnt thal becomes exogssi rely hot the ord on rhe oJrput from th t component is ax ssve Ovsrcurr no See page r0 ff the AVn cirauft or the flnal clrcult le repalrad choc tha cootlng ifan Thic ls an importont ttp fot mloimbing redundanl lroigchY I A trnd3lof ln thr AVR ohoult lrllr Meny engineers problbly haw experiencing tinding a detectiw tansBtor and rcdacing i
14. The waveformr are rounded 4 ll torminals ar3 Bhorted by mistake during the check the wsvefonn disappears Turn the gotnrsr OFF and ON again rspe t dly untila wavsform agpears again 5 Locate the defective line in this way lf an lC laad is lifted during the eheck by this method he waveform disagpesrs The micro com putar sto p s ope rat i ng This mcthod ls useful if the reslslance chec fatlsto lind thc ceu3 of tfie problem s6 9 Mobile and Handy Tranccclvcrc t lXgital clreult The digital circuit is comprised of I single chip mrcrocornputer DISPLAY FI I DATA Ths contents of the intemal ROM differ from model to rnodel Pary spccial attention to thas when replac iltg the microcornputer Example TM441 75116GF Z2g BE TM 702 7s110GF g 3BE Thase models contain microcomputers of the same type but the three digis in rhe middle of lh des differ so they are not compatible wrth eacfi other The recent multi functional handy tr nsc ivers and car transceirrers with detachable panels have a sub CPU in addition to lho rn6in CPU which communicate with eacfi oth r to transfer dao vcr PLTDATA RESET CLtrT BACXUP PocrrON t Howtochcck 1 ls the power supply oltago apdied to each lC 2 Does the rnicrocomputor outDut clocks Also check the sub PU l 3 ls the r set voltage present 4 A re the rnsin CPU and sutrCPU grounded with a bwresistance resistor about 10 ohmsl 5 Reset the t
15. Z lptn g but thc AF sbncl bGs not ent r thr AV lph A AV ANTI VOX lin The receiver AF signal tinc ia connest d to this pin through th ANT VOX VR AE the AFVR b tum d the AF signel bwl changcs YE VOX GAIN line The AF signal from ths rnicrophooe ao conn at d to this pin through amp e VOX GA N VB Gt I t lt Qrat rct lafal 11 PROClhoccscorl There are turo typ s of procEssorg r RF tyD lT8 0O f OaO fS SOl Convsrts the transmined AF signal to tho lF sign l rnd amplifies lt The follodng block diagram shows thg TS 940 processor Whon the processor is OFF rhe lF sbnal p cathrough D79 When tha pfoccssoris ON the lF sbnol preeos firough O40 lC4 O4il and DaS Pr d trl OFF ritch arilCAi S artll AT P T CranrE 6 rlt 43 a e stt O37 fitfr Clp Ai P amp ilb Alf2 o f rlcPR ln L f o Cqnpra bo bral llnlrEf ATIP Grln cqluol AilP 2t FFC C OUT oqanf clret o r t oo f AFtyDcoiolhf rett lncraaso tho microphone amplifiBr gain lf the prooessor ls oft O41 i3 otl and th gein of lG4 b dotcrmincd by Rl ard F3 tf thB proc sso sl vitch b ON EV is apptie lt i to rhe bose of O41 the p n between C and E ot O41 is shorted and tha gpin of rc4 is determined tsy Rl and R2 hrhk t are connedcd in perallcll antl R3 ln eddition the O42 ALC circuit sterts operdt ton 12 Trunrmlslon Tono Quellty lr Poor r 88A L Check the linal bias Mode USB C AR VF
16. ZXlMHz Mode Oi CASVR M amp BKIN FULL Connest a 6Gohm jb to DFIV OUT on rhe RF boatd SEND ON t ls the LGl input to th mixer circuitT Ch ck the level 2 ls dre lF signal ingut to the mixer circuit Checkttre lewl 3 Check the level snd the frequency of the mixed signal 0 Grnnot Adfurt PorYrr lThc Domr crnoot bc rdlu rd by th ALC rdlurtm nt v d bil rolAor lvRl l ln t nis aag a mo ly tha ALC lc dcl rw The refermce voltago and po cr olths ALC sholtld bc cdluztcd Fkuil squol dn refarcrw voltryla lf h ia incorrsct verlous problomc erioc lw oxamph tlrc ALC anqtul lo alwoys off scale thc mater pointar doce oot move et tll ot the powst ie too tow ot too highl ttttlr l rrlt ff ert r _ J lLglL _J 7rC amp r 6attat hrl 4 ls the LG2 input ro th rnixer circuit Checktha lewl 5 lg tfre TIF signel input to the mixer circuit Ch ck lh le rsl 6 Check the lqval alt r mixlng as well as the frequency 10 Ch ck thc bias voltag qf the FET that g6neftttes ALC 1 1 ch6ck the cAR hv I 1 Chock ths ALC det ct on dirde in tho filter unit with a telrtar phm rang I 2 Ch ck the VSF line voltage with a DC VM while twning tr o CAR VF A3 th powe increases thq VSF lrolt B increeses 3 Does fhe dtao at rhs middle point of e ALC IVSF variaUa r si3tor VR change when it is rrrnedT 4 ls tho negEtlv volteoe for the ALC applied cofrectlyT 5 ls thc ALC vd
17. f rct etaCe work prcperty by Bpa todtv checking trcoamission end reception following rePalr I Low ruecptlon rcnahlvlty This input should provrcle SINAD 1zdB I Def ot is suspected after point D lF loqal oscilletor lailure Low oscillator level Defective lF lC Delectivc 455 lF fiher Detect susoected between goints D and C Low mix le Defective MCF Defec susp cted betwe n points C and B Defective RF amplifier or helical BPF Defect suspected betwEen poirns B and A cor rTFoL To PA soL AF VR 2 3 4 d3 r EMF l dBF EMF lvrm3 lHlgh frequency WVMI eoaEr eur aPf 28 DET OUT I Rccrtvrl lraqu ncv t ttft See Paoe 25 f Odoriiv 9OL See Page 17 I S mltrr lli rF tN 31 Defective LPF or switch EL aclctitional band tc t RF STiP I Low rnrhlvtty wlth rn rddrional bcndl Most rocent lransceivers have additional bandg wide and caiv r circuilst lf ths tail he ssnsitivity d6t rkyatos As shown in the below tigure many switchlng diodes aae connocted to the receivgr llne 1 I D208 Tnnsmission reception switching diode 21 D2Gl and D210 Recoiver stsge prorectior diodee 3t D21 l Economiccl ktwgo wer BF switch q D214 end D215 Switching bewwen 36 MHz and 430MHz bande ll any one ol them is short d or rnaltunctions the sensitivity d t riorates n nl O4GJatI O rt E GERS a G ffi Dl ENE I EL _rt li a TRANSMISSION C NCU T Setup
18. have an LGD assembV check the data ne with an oscilloscope Check pints A and B with an oscilbscope OK if a ct Eital signal b outprjt rr rfian turning the encoder lf data arrives at tha LCD driver input and 5C and 8C src input to the board the driver lC may be defective The LCD assembly is regisbred as one unit Rephce th ntire LCD assen cly r 5t I Car rrnrccivor For some car t ans ivers the fla cable of the LCO assembly data line is soldered Check for defecttus soldering or shorting ffF 751 TR sr etc soms reflow ype connectors w re not soldersd securely and solder was separated due to shocks TM 702 etc l I Handytnnsccbcr lf th display is abnornrl the zebra rnay b insulled inconectly Disassembla the dbplay unh clean the zebra and terminals and reassemble them Especially TH 25 ano TH 6 ser es LCD Elgclrobc Eoerd Type ataehed by heat press TH 77 TR 501 Both ends of th contact ar a tend to have poor contact lf tho contact becornes For the dispbv thet should b invisible becomeg visible from some angles This oocur lreqlendy in the inital bt of rhe lH 77 1 Flst caue Contlct trea f Mod bwlrh dlodor ll EDsl The Gcent models do not uso any diodes LEDsl The rrodcls betore th6 TM 211 used thgrn l Whcn thc current flows from the anode to rhe cathode sf rhe LED it lighrs check wherh r the voltage is applled to the anode The cathode voltege should be negati
19. increases slowly and the maximum current does not exceed 300mA lf D2 is this Upe of diode the bi6s current increases rapidly lf the circuit is not modiiied the current exceeds 300mA See S T R E51 9 l 83 Hotr Finally check the cooling lan _s_ z TS gsOS SD Final Tnnristor Failutc I Roplaclng dciraivc prnr 04 MRF429lr4P 02 03 2SC3133 08 2SC2922L8 The problem usually is golved by repl8cing thgse p8ns 1 06 07 2SDla06 D or Ol 2SC1971 may b6 defeclive Check thern with a tester 2 Beplece LS with an output tonslormer L39123 amp 05 for the SDX 3 Comdetely remov the 51 and 52 hear sinks lf lh swltch rnold cracks as ghown in the figure at the below rsplace the thernal switch f A mbh 1 Do not lorget to reinstallC23 and C24 in the final trensistol 2 Qt has an insulating spacer lnstall it carefully 3 Thermally connect Dl D2 and D3 correctly 4 Do not use an electric or pneumatic screurdriver to install thg Sl and 52 screws Tighten them rnanually without using any excessit forca The screurs are special ones that Erc not tttracted by eny fiEgnets Do not us screws that ar ottracted by rnagnets or otherwise the thermal switch may fail 5 After fightening all the screws lixing the finsl board rerrKlve the filt r board and check the rear side of the board Check whether the coil and capecitor leads are soldsred securely to the filter board Resolder them if desired lf the filter boa
20. lOMHz l str 73 O5MH 2nd 8 83MHz 3rd 456kHz First lF frequenca 73 05MH2 Secorrd lF frequency 8 amp lMHz Point Ar r4 lOlMH SSG frequencl about lOdB Third lF trequ ncy 455kHz SSG outputl ls fie signal received 1 LO l YES The BF band pess liher BPF is defective 73 05 14 10 58 95MH2 Check conneclions from the antenna to point A 73 O5 14 10 87 15MH RF amplifis power supply ond th6 BPF switch LG l must be onc of the abovo frequenc os NO i Other circuits are defective 2 Lo 2 Point B 73 05MH2 about 1 B 73 05 833 O0 22MHz ls the signal r c ived7 73 05 8 fX E1 88MHz YES The Lc l lrequenry is incorrea LO 2 must be one ol the above frequencies ls rhe t O l frequency cotrect ls the level sufficientl 3 LO3 NO Other circuits are deleotiw 6 83 0 455 8 375MH2 8 83 0 455 9 285M1 lz point C 3O5MHa about 25dB LG3 must be one of the ebove irequencies ls the signal rec iv d YES The tirst boadfass liher BPF is defeciiv t tr th lF frrqrnoy b dffttotlt or the first lF amplifier does not wotk Sct cl3dtY trequerlcry 14 175 MHz ThEre is a problem b tween proints B and C FirstlFtr qu ncY 40 055MH2 Locrt it with rhe jig S cood lF fteguencl 10 7 MHz NO Other circuits re dcfcctivc I LO1 Polnt O 8 8ilMHz about 25cts 40 055 14 r 75 25 88MHz Is th s rgnal receivedT 40 056 14 173 54 23tt llHz YES Tha LG2 frequenry rs iocorrecr LO l mu3t be on
21. lhe AVR board is 0K The power is not turned 0N due to a problem in anofier boerd Check l2V and 5V applied to fie conlrol board and digid board ls the voltage applied to the microoomputer or other lCsT N0 Ihe AVR board is defective Check the rear side of the AVR board for soUering defects izcto Dx4 t tv j r sw untt llat tat Foot c or I I ai t o POWER SUPFLY UN IT X43 I43O OOI 3a Aa 130 lt 0tet l 0 r 2 0l o l a 03 o ol a3tt6rtc 23C lr r5 lY arcrrallt 2 3C2att Ot u 09l xz t2 rsta0a uz tre FOIIFlO tl sv o3 0ro t 225 Check points A AC primary voltage Tl lN B AC secondary wltage TlOUT Cll Hish B DIOUT lC2 Common B 03 collector lDl 28A 01 02 emiters D2I28B FUSEOUT E 21C 03 emitter TS gl0 AVR unit 2 Powcr ie Not Turned ON lFor modrb rvldr an ortcmd powlr supplyf Connect the erternal powsr supply lo the set with a DC powar cord The ponor supply should heve an arrfilgrer and a currqnt imiting circuit The iimit cuilent should be set to 3 to 5A 1 The pointor ol ths ammeter on thc power suppfu doEs not mon when rhe gollwr swrtch on th set is rurned OFF YES Turn the set ON Go o ltcm 2 NO The final transistor gower module or revsrsoconnestion prevention diode is broken The povrar line mEy b dirsctvgrouMed Ou6 to wire seizure 2 Does the ammeter pointer movs when the pora r is tumed ON YES The DC cprd fuse
22. resEd How to r sst hsndy trsnscaiv rs Hokl do vn lh M l oy anct turn the power ON All resetl TH 28 TH48 and TH 78 Hold clcwn tha F koy and turn th6 por wr ON VFO resetl TH 27 TH 47 and TH 77 Hob lt bwn the ENT key and turn th powsr ON MFO reset This is e softwere res tting procodure for the mnrocomputer 2 Dissonnect rhe power connector b ltory hold down th ppropriate teset kay snd lhe power switch and connect the pour r clnnoctor batrery For mod b wilh so fo pre amp a8 tln pow t ewitr h the mlcrocomputet is sctirn whila the pwar supply ls connecTed lf the powar ls tumod OFF whrlc the microcomputer ia malfunctlonlng il eile E ths D ckup moda end romelnc tn e abno met etete Tlprcfore he mlcrocompu at doas not t cpa any commcnd to turn fia pvter ON The chedt in ltam 2 ic aalrformcd to shut down the powct completcly tnd to stop tod ta tct hc microcomputcr 3 Open th case and check whether the vottiage is applied to ths microcomputer Measure the voltage betwesn the microcomputer Vct and GND using a DC VM ls the olt8ge pGsentT YES Tha SB line fus and F ower cord arc OK Go to ltem 4 NO r Check tho SB line fuse power cord and conn ctor 4 Check the line from the power switch to the microcomputer Does the CPU pon go HIGH whcn tho power switch is preeeedT 5 Disconnect the lithium battery for microcompwer backup from the bord to discharge the bac
23. rnhrcomputer Don i of th6 lF unit and d rgital unit 3 Check the CTXB on the TRX board in the lF unit Reception 0V Transmission 5V 4 Check pin 2 FLB on th BKIN board Does it go HIGH 5 ls any voltege applied to the Dl terminal on rhe BKIN boandT s 8V pre3onr 0 Check pin 10 NSS on the BKIN boarcl ls any voltage presentT 3a DTATY E Outoutvohcoc t A B IANDI D IXANO 0 0 0 1 o o o o I 1 1 I d GND a r__J EH i4FT lr itruJ IIEf t l TSGII lF unit 3t Tnx x50 580 Ott 23 l tI ua iE o Fl s l ffiro ncm T ff Y l I tcr ot I f l tr dg a l lc I B H tfr lurffi r Irra r rtd ze to r iJ 2 No TronenrLsion Ponv lc Odput Thc ON AIR lndicator Llghel l Enter FM or C r mods CAR VR MIN ln CW mode eer BK SW to SEMI or FULL 2 SENDbrnon ON 3 Slowly increase the CAR VR frorn zero 4 Observ the amm ter on th6 por r r supdy lf the current exceeds lOA thi linal unit is consid red to be uorking 5 Use the SWR meter to measure ths VR lf itgoes off cale a wlre botwesn the final unitand tho ant nna is broken 6 S t the CAB VR to sbout 8100 and chec the level with an oscilloscope Measure ANT LPF OUT LFF lN end FINAL OUT in th6 order lbred The l vel increages et some point Ch ck it carefully 3 Low Powcr lf the power is low turn the ALC adiusting var nble resistor VBl CAF VR MA POWER VR MA Y ALC
24. speaker is connected the two pins have conductivity 3 Speaker terminal lf no external speaker is oonnected th t E pins have conductivity I Hrndy tnnrcclvcr rpoekrr tcrmlnal lwlthout ramolr cofitrollcr 1 GND 2 Speeker terminal lf no external speaker is connected the two pins have conductivity I Fclays There are various relays of different shapes and pin counts Chack the wiring diagrams in the Service Msnual Pay attention to applicalion of the voltage when opdrating the relay l When th rglay is OFF the voltage is applied to the coil 2 When the relay is ON Vcc is applied to the coil vGC 6 Rubs for Naming TeYminals The name of eoch terminal is shown on the circuit diagram lt i6 helplul for repair to becoms familiar with the furrctiorE of tie terminals The recent manuals sholv the functions of all the terminals Look at them when ciecking the lerminals The menuals for old models do not show the tunctions of terrninals but they are similar to those of th newterminals xxti Power supply lines SB FB TXB RXB etc xxv Power supply lines t15t 9V 5V etc The initial nrJ mbers indicats voltages l xxC Power supply lines 15C 8C 5C SSBC CWC common voltagre control rrchage SS ST Standby line When grounded transmi ion stan3 Mxx Microphono linos lMlC MGND Ml MO etc Marker lines or ffyain signal lines lor dual band transceivers UP DN Microphone UP DOWN signal Normally hbh
25. the same wEy and ch ck thcm So6cr thom tgEin after ohecking Symptom l8V is lower than the prescribed value Cause D48 is shorrsd 1 Remove L85 r No chaqgo Solder it agoin 2 Renrove L47 No change Solder it sgtin 3 Rernove R60 antl R150 r No change Solder them again 4 RernovE R24 m7 VFl and C77 No chang Solder them 4ain 5 Removc L3 and L4 r No change Solder them again 6 Bcmoc R14 l ard Blil4 The vohcAe becomes nonnel 7 Solder Rltl3l r The wltage rcmains nor nrl 8 Soklor Rl44 Thc voltlgB drops This line b defieetive 9 Removc lcl pin 16 C17E D48 D25 end R152 10 Solder the oomponents egain on at a time to find th on that redrrces the wttaoe 11 D48 is found to ba shoned See th circuh disqram on the next page tt It th lloc b oundcd ulr Jr o ftmrrtr ll th yohlga a lbnolrnal usa r D C VI O mst r _ 6 Modclr That Crn Urc Two ryay Porrcr Supplloc TS 711 TS 11 ote l These models have the follotting configuration I Powor St t 1 The AC po ver is suppli d but DC power is not sudied The parts enclosed bv 1ff3 seem to be defecriye 2 The OC pow r is eepplied but AC powcr B not supdi d The pene onclosed bV tr may b defeaiva See the Power is not turned ON g ction Fora two waypowdr supply chdck AC or DC powcr to isolate the defea lf neithcr AC nor DC power is euwilod s ctcult followlng DCJN le euspectcd I
26. to th antenna of the defscdve set Use the olh r to slppFy the bcal frequancy lf only one SSG is availabte Connect a dummy lo d to the set that oan rransmit signals Transmit sigrnalg tt low r rer Use tt SSG to supply the bcal f oquency Connect e slmplllled antenna to th anrenn of rh delecrive set f t t Or dllrctivt r 6lvor rrcolvc rlgmalr t Remove LGl and input the SSG carier ro th first nixer ckcuit Tha probbrn is solved LO l is wrong To PLL circuit LO 1 Thc problem as not solvod LO 2 or LO 3 is wrong 2 lmtall LO r remove LG2 and input th SSG carrier to thg s cond mixer circuit The probbm is solved I LG2 is wrong To PLL circuit LG2 The problem is not sohrcd LG3 is wrong To PLL circuit LO 3 M asure the LO l LO 2 and LO 3 frequencies with a froquency counter wh n the connectors ar6 disconnact d ln rt the frequencies into th SSG The SSG outgut must be at least StldBI Noic lf the circuit ls conltgured as follows k cloes not work unless the voltage is applied to the hot side of the shielding wire fi 7901 This chock can isolato a detective PLL To LO lN To 8V lanc 2 Daftctiva l l I tr you find c ddcctlvr PLL 1 Replace the VCO transistor and FET 2 Replace U varh ap diod 3 lf ths model is designed to adlust the lock voltage with a trammer reploce the trirnrngr 4 Replace the smoothing ceFr citor in the PLL tPF circuh 5 Replcce ths trarsis
27. 8149 DIGITAL CIRCTJIT 1 Display Error 50 2 How to Check The Microcomputer 50 3 Nothing is Displayed 47 I 5l ffi s2 5 Meaningless Displav or Displav Error 6 Kevs are Not Thursday Dooember 25 1997 9 57 PM INDICE MANUALE RICETRASMITTENTI Page 5 of 8 Accepted 53 7 How to Find Missine holes in a board broken patterns capacitors or coils 55 8 Checkins Waveforms With the Power ON 9 Mobile and Handv Transoeivers 57 PLL CIRCI IIT l PLL 5 tv 2 Unlock 6D 3 How to Check the PLL Data Lines 0 61 4 How to Cheok the PLL Data Lines 61 5 Tips for Repair For Repairing PLLs 62 6 DDS Direct Digital Slnthesizer 63 7 Ts44o PLL Ch kp i ts 64 8 TS440 Last Loop Checkpoint 65 9 Quick Chart of PLL IC Input Output Pins 66 Thursday December 25 1997 9 57 PM INDICE IvIANUALE RICETRASMITENTI Page 6 of 8 10 PLLs of Mobile and Handy Transoeivers 67 AI IXILTARY CIRCTJITS l Noise Blanker 2 Notch Circuit 70 aJ Bo Out 71 _ 72 r 173 4 RF Attenuator 5 Filter Swithcinq 7 5 6 Autbmatic Antenna Tuner AD
28. CAR TIF BIF Dft l xx so SPx AFx Carrier signel line Transmission lF signal Boc ption lF s nal VOX signal control line CW KEY control line Squetch conrrd FSO SSO SCI Speaker silnals SPl SPOI AF signals lAFl AFz Al AOI o Eg AGx AGC signals AGC AGS RFG RFGAIN VRI VSx Voice unit RA RXantenna DRV Driva OUT DO SM S meter FSM SSMI ICM lC meter PVVM Power meter ALM ALC rnster PROx Processor line ATx Antenns runer ATA ATT ATSI RAT BF attenuator ATT VSF VSF signal line VSR VSWR signal line VCO VCO s rgnal line CV CW carrier control voltago VCO control voltege VCV VCO oontrol vohago TOx TONE control signelline NBx Noise blanker line HET Hetero signal H642 etc l LOx Localsignal LO1 LOzl DA PLL data signst CK PLL clock signal EN PLL enable signal UL PLL unlock signal ULU ULVI T l Transmission control line BZ Buzzer BP BEEfl PRE Preset signel NXX NOTCH sQnal DIM Dimrnercontrollire MON Monitor line 7 Reading Lcvcl Dlagramr Example Use the level diagram to solve the probkrm of low reception sensilivity of the TS50 Sae the TS 50 reception lweldiagram Page 921 I Sctup SSG frequency 14 201 MHz Output Vary lrom OdB Set freguenry 14 200MH2 Moda USB F LOCK ON AGC OFF signal recept pn Set the AF output to 0 dlVrms bry tuming the AF VR Thc AF output Is used a9 refcrence aubeeguont meaauramcnrr Do not touch AF VB efter scttlng I Attach thr rc
29. ICE MANUALE RICETRASMITTENTI Page I of8 Indice del Manuale RTxk nrood in lingua inglese Pagine grafrche in formato TIF prelevabili singolannente Prelevando futte le pagine C possibile ricostruire il manuale originale CONTENUTO POWER SUPPLY CIRCUIT Riparazione dei circuiti di alimentazione l Power is Not Turned ON For models containing an AC power supply 5 t 2 Power is Not Turned ON For models with an external power supply 3 Power is Not Turned ON For models with a softnare sense type power switch 8 4 Ths Voltage Cannot be Adiusted 9 5 Example l0 ll l12 r 6 Models That Can Use Two wav Power Supplies TS 71l TS 81l etc 13 RECEPTION CIRCUIT 1 No Reception No Noise r i 15 Thursday December 25 1997 9 57 PM I ICE MANUALE RICETRASMITTENTI Page I of8 Indice del Manuale RTxk nrood in lingua inglese Pagine grafrche in formato TIF prelevabili singolannente Prelevando futte le pagine C possibile ricostruire il manuale originale CONTENUTO POWER SUPPLY CIRCUIT Riparazione dei circuiti di alimentazione l Power is Not Turned ON For models containing an AC power supply 5 t 2 Power is Not Turned ON For models with an external power supply 3 Power is Not Turned ON For models with a softnare sense type power switch 8 4 Ths Voltage Cann
30. LT DIV ranges or nrcre one of the 2 lines is faulty WW M Because a PLL is unlockgd does not necessarily mean the PLL unit is dsfEctiw The TS aO has Mro PLL circuirs in the CAF unit four PLL circuits in the PLL unit and the last pLL VCO in the RF unit lt is therefore necos3ary to check the CAR PLL and FtF units for repair The TS 950 has four PLL circuits in rhe CAR unit four PLL circuits in the PLL unit aod the tr o pl_L circuits in the AF unit The TS440 hes five PLL circuits in the pLL unit the last PLL VCO in the RF unir and a 8 37SMHz oscillato circuit in lha lF unit Also check the controt ldigitat unh that is comrnon to all the npdels and power supply tines when making a repair 2 3 When the TS 7S TS 81 1 and TM4xx are repaired a limited number of p rts can be checked with an oscilloso e See the measuremgnt seotion on page 96 4 Before acljusting the lock voltage read rh SeMce Manualcarefully lf the mode or frequency is set inc rredly during adjustmenL atl6ther probbm rr6y occur as a result 5 How to check the VCO operarion lf tha PLL is unlocked the VCO keeps oscillating at free run frequencies connect the freqGnqt oounter to the vco output and tum the lock voltage adiustmcnt coil trimmerl whilg monitoring the fraqucncy lf the trgquonry changes the VCO is functioning corr ctv 6 You can determlne which circuir iS defective by chocking the PLL lock voltage lf it is 0 611 oither
31. T DIV on the oscilloscope so that rhe level can be observed To checlr the frequency band of the Y 88S 1 SSG frecnpncy 8 amp lMHz lilldBp Oscilloacope 0 1 V 2US 1 Rsduce the SSG frequency in l00Ha units and observe the oscillogcope level Meny peaks will appo r on the display l 2 lt the weveform diminishes and the lavel can no bnger be recognized return the lrequencv slightly and read the trequenry of rhe last p k 3 Record fl 4 lncrease tha frequerrcyand chock in tlre same way 5 Record f2 This shorrrs the approximate band width Band width fl f2 Frequency band width fl to f2 aaa rt a r a lr amp amp lMHr IIItII So6ctrunl lrlwlr t t 12 t _gE _ 6 llow To fi easure SSB Sensitivlty l0dB N hthod l Enter the snntrd sensitivity sigrml rom the SSG The standard sensitivity is given in the specifi catnns in the nranual l Example 0 25pV SSG frequency 14 lffiMHz 2 Make the set receive a signal and check the AF peak 3 Set the AFWM pointertoOdB on the red smle with the AF VR on the set For a digiulmeter set the display to dBm display and increase the AF outputto 0dBJ 4 Turn the encoder or press the band switchl to detune 5 Read the ltWM when noise is emrttd 6 The sun amp d is satisfied if the difference between AF outputs duilru reception and detuning is 1OdB u m0re OCIiI AilT EN
32. The tester pointar moves twice for ransistors of alltypcsof d B C ard O with some e ceptions such as digital rranslsrns It the pointer movas only once or thre tincs or rnore the transislor is defective Even if the pointor nnves twicg increase the ohm range ro about x1 00 o confirm that thg pointer doas not rnove ff it do s not nrcve the transistor is OK lf the pointer mov6s even shghtly the transistor is dofgctive Remove the transistor from the board before rneasuring lf the trarrsistor is inselled on the board it is affected by the ambient circuits and the tester pclioter mov rs ct s reral points rcsulting in in ccur te anea9uF nent 0 6v E7 I Capedtoru Tha electrolytic capscitors as wellgs capacitors with high capaciance can be checked with a tester l Set an th 1 ehm to I K ohm range 2 Conneo th tester probe to the capecircr 3 The pointer moves briefly end relurns to zero lt tak6 longer timE to return to zoro lt the capacitance is hpher ll the pcintsr do s not return to z ro th copecitor is defective 4 Chenge the pdarity of the tester probe and perform the chgck ag6in 5 lf the pointer mov s and returns to zero the capecitor is OK I Goik Short d coils can b detecred with a digital multirneter 1 S t the muhimeter to the ohm range end rmximize the sonsitivity 2 Short th multim tor probe and check the roacling when thE resistanc is zero 3 When the pro
33. adpsting VR MA Frequency 14 2d MHz l80w or h lgher can bo output Reduce the cAR vR immediatoly fter confirmrtion See page 41 Maximurn poruer is low l lf the power is outpul rhe final unit is OK A following circult 13 susp ctecl Check rh LPF relay and connectors Or rhe linal unil or a circuit before the driye is dEfectiv I How to ohcdr whrllrr thc llnal uhh or r c auh bdorc tftr drtv h rlof tivo 1 Conn ct ttie iig sholn bclow to rhe DRV tsrminsl on the RF boad end mEasurs the tput level wlth an oscilloscope lf rhe lavel is abo t A pp the circu rts before the drlr e are OK 2 lf the CAR VR is set o MA the ttrtue waveform s disto ed lf it is a clear slne wE 6 thc driv is insuffbient 114 MHzl 3 7 lf the curront is rbout 3A Check th DnV OUT terrninal on the BF boerd with en oscilloscope E lt is oK it it is about 2vp p when the GAR VR ls ser to MAx 9 ll tho drive rs low a previous cicuit is defective 10 ls tho LG1 level oorr ctl 11 13 the lF signal levsl conectT 12 Does the mixer circuit work corr dly t3 ls fie LO 2 lewl ctrrectl 14 b t te TIF sfnal lewl corrcct 15 Doos the mixcr circuit 2 ops ote conectv t6 ls 455kHz CAR ourp rt I Ch ck tor dltlcrtur frnd unh Scc ncxt prgcl Use an oscillosopo CAR VF 8 00 Do not increaaa thc vrtiDble rcsistor VFt cxcativary Otherwiee the f nal tnnslstor msy fall dw ro high ftqwney utecffing 1 See the le l of the pre
34. aged I Thc output volt i ot th th a tarmanrl mgulotor b hlgh or bw 1 ls the input voltage of the three tsrrninal regulator HIGH orLOW Normol The lC is d fec tiv orth load is LOW or HlGHl Goto ltem 2 Abnormal A circuil prior to the lC input is defective 2 Firsr red8ce the lC lt the ploblem persists the load mey be 0bnormal 5 Exrmflc gee the TS 40 AVR circuit cliagrEm again Page 9 I ll tho FlOl oulfot la lnconcct Disconnect CNg flCl01 outputr lf the lC orJtput becomeG norrrral th load is wrong Discronnecttle 5V output pins of CNO one at a tim lf th voltage becom s normal when a pin is disconnected the b6d on the pin is abnormal lf the voltaeo ls HIGH Measure the voitros at the pin DC VM Normally the vohage is 0V or less lf ir is higher than the lC output it is the caus of tho ploble n lf tho voltage ls low Measure th tesistanco at th6 pin lTester ohm range It must be lower than th resistances of the other pins This ls the cBuse of lh problem t0 Errmplo t l Disaorin ct 6ll CN A connestors 2 Dbconnect all CN A pins one at a tirn 3 CN Apin 1 is tound to befaulty R conn c the pins 4 Disconnect CN B pin 1 lf the voltoge becomes nonnal this line is defective 5 Reconnect CN B pin 1 6 Disconneet the CN 7 This indicates tfiat the CN board is defective I E rnpL 2 Ttt 9ilo RF unh Remove the co nponent on the boord onc t timc in
35. al enter the comperison lrequency input pin of the PLL lC See pege 64 and check the comparison flequency input of the PLL lC I A ocrtaln rrngc of hcquendcc la unloc cd llhc rrngc b not dc lrilc a ne rll thr brndc unloclcdl See the PLL block diagram on page 64 Example The D7 voltage is zero lLock 5V Unlock OVl lf lC9 is unlocked do nqt check only this kcop Tho comparison frequency of the loop is a combinetion of thelrequency produced by O18 the lCl PLL output and the lC4 PLL ouQul lf the lC1 or lC4loop is unbcked the lC9loop mayalso T aaO RFunh be unlocked f lhe lCg loop is unlocked the lest loop is also unbcked To repair a PLL of a hlgh freguency Hfl transceiver or all node transceiver it is a fundamental step to find the highsst level unlocked loop The highest level PLL loop of the TS440 is the lC1 and lC4 PLL The lest loop is the lCtT loop The lC18 loop is an independent loop lf rhis loop is unbcked it does not atfecl the other loops I l ow to flnd unlodcd loopa The PLL lGs has an unlock d tect En pins Locked High Unlocked Low Some lCs have a reverse logic l Check Ell the unlock dotection pins Use e oigital voltmster or oscilloscope l You can find unlocked loops an this vmy lf all the loops are unlocked 1 Chtrk e oommon power lines 8C 5C and 15C 2 Check whethar the reference oscilletor is working and whether the reference frequency is supplied to altthe PLL lcs 3 While turning the enc
36. an jct melt whlfc l is used t R tm0 unlodr 1 Remore ths bond in th shiald case crntaining 07 and Q8 in the PLL unit f TSiaaO unlock 1 some parts ol the vco shisH of the RF unit may be soldered poorty lParts near Cl77l Check these parts to repair 2 Push in the pins ot the PLL RF and lF circuits 4 TS 9 IO Unlodc The TS 940 or TS 440 nini onn ctors may have p r contact lf a nrodel ig retqrned lor rcpair to solve en unlock problem but the symptom is nor found Push in conn ctor pins I Malnly chodr thr tollovlng pcrtr RF unit lF unh cN7 CN8 CNg cNs CNg CN10 CNl2 CNl3 Convol unit CN1 CN2 CN3 CN8 CNl7 CN18 cN20 cNzr D rgital A unit CN4 CNs CN7 CN13 CN14 CNl5 cN16 Keyboard 2P 1 7P 1 7P 2 CAR unit Alperts Pl L unit Al parts Check for poor contact of the ground siie of CN8 of th6 PLL unit Symptom The sensitivity or transmlssion power is low Tighten the part shown in th6 figur at the trelow 5 TS 790 t ll D2ln tlrc iloilll z llnal unh lrilr Excessive po rer is output 1 lf the final module and D2 failed tum tha board orrer and chec the sdder on tha D2 psnem lr rnay be as fdbals 2 Soldsr D2 and peripheral pans egain and rein allthe board Must the power to il2w Chr si R cold r 5 ADDITTONAL INFOflMAflON 2 Measurementl The oscilloscope can rnasure hrgh voltages of the KV order Apply the high voltage probe to a digital vollrneter to measure high voltsges
37. bs are applied to both ends of tha coil th rosistonce differs lrom that when th probe is shonsd Reglstsnce lmH About9 0 ohms 102 brown bbck redl 100FH About4 5 ohms 1101 brovwr black brownt 10FH About 0 5 ohm 100 brown black black ltrH About 0 2 ohm 1R0 brorn black gold This typ has lovrr This type has high internal resisbncs intemal resi ance vcc used to ground th oulput Usecl to applV Vcc to the The voltagos I Dlghel tt n l tolt NPN rlpe NOT circuit DTC t pe our GND PNP type NOT circuit ouFut DTAtype our I FETr FETscannot be c ltec ed with a toster arc slrown on the circuh diagram o I Th rmktor The rmistor fior circuh temp nature coffrpensatbn IFT Conl gurc lt l as shourrn at th rbht Wh ther it is open can be checked with I tester To ln all a six lsad IFT Align the silk rnark on the board with the notch on the IFT cese 68 I HandV transccfocr mlorophonr conn ciot 1 PTTOFF 5V PTTON 0V lf this is grounded the trsnsmission mode is entered 2 External microphone input lf no oxternal microphone is connected ths two pins conduct 3 5V output for power suppf to capac rtor microphone and so on lf no enernal microphone is c nnected the two pins heve condrrtivity I Handy trrnrcclvcr rpcakrr trrminel lwiih rdnotc comrollcrl 1 GND 2 Remote terminal The clunge in the vohage at this terminal adivates the external remote control lf no external
38. by insenion of an emmeter into the power supply line Alrnost all transistor finals The cunent can be checked by meesuring the d op ot the vohaga across s rosistor ffS 950 series SDX Adjust the bias alter the components warm up sufficiently ll it is adjusted soon after the power is turned ON an gxcossive idling current flows and results in a thermal runewey lf it occurs the set rnust be repaired again The power adjustment name ig not standardized it is called power adjustments in some models or ALC adiustment in others A l5Gohm dummy is requirecl to acljustthe SWR It is very impor0ant to check the frequency during adjustment Whan the CAH frequency is adjusted the SSB transmbsion frequency characteristics CAR POINI also rnust b edjusted GND IMIC GNO oowN fl SS PTT Mlc i llc tcffilnrl vlcnr frorr froot mml d l Powar meter or oowN MDl 82 I ALC mstcr diustmcnt AG output increase 6dB r 5mV increase by 6dB resulting in lOmV I A is316 nt mo amp T9450 and subsequont models send data lo the microprocessor and hold it in the EEPROM to cut dowrr on costs and simplify adiustment The microcomputer calculates snd displal s met r curv s according to the dara Eefore adjusting the unite r ad th Preparation section carefully f T5 460 and TS 9o How to erter the adjustmefit modo Hold down the AlP XlT and SCAl l keys and turn the power switch ON Press the UP key in menu No 02 once
39. ce the descdption of the PLL circuit on paoe 59 1 3 lf thc T R b abnormsl check whcther dsta i8 inout ro rhe data input pin of the shift regiaer PLL lGl lsee p ge 6l l The tEnsrnissiofr request cleta is ouFut lrorn the microcompuler immod rately after the PTT key is pressod Modcl or scrbs narne Transmiesior rocqti on snrithing saOnal Terminal rume Tn 2Or cnd TM l 1 Mbro mDuter outpur pod iST rM 221 PLL lC SWl S t 2 TM e l ondTtvt 241 Shift register lC Im TM 701 and Tllf 702 Voltaore suppty salect lC Tt Tf 1M 721 ard Tlvt 81 PLL rnoduls TR TM 741 artTM 742 Shift registor lC T R TM 732 Shift register lC TX T amp 751 and TR 51 ST line from the microcornputer 2 Ground or unground thc MIC AMP lN brminal p ru 3 Grcurd or unground tha MIC Ai4P OUT terminal This sho rs Wreth r rho ndsa occurs when thc AF signal is iasued or efter CAR conrorsix lf the noise occurs after CAR conwrsion Thc PLL probably ls defective I lergr nobcfrom hl nodolr 1 Bepbca the PLL VCO IFET and tflnsistoil 2 Replace the PLL lock voltago adlusting tritnmer 3 Repleca the PLL vrdcap d nde 4 Replace the PLL LPF transistor and srnoothlng cepscltor 5 Rephce the PLL At bast 80 of the problerns may be solrr d by now It tho VCO as rnodularizod replace the moduls lf the problsm stlll parsasrs soo p go 25 Defecitue naoaivor tooa l the 46 Doas not llght The transmission request s rgnsl bss
40. cillates transmission and reception frequencies 01 VCO 02 Buffer emplifier G4 AVR G5 Amplifier O24 BX band pass filter transistor lCl PLL fC lC3 UL detBct on lC D2 FM d tode Dl and D6 Varbap diodes D3 Dioda for swiching the VCO frequency during transmission oz e3crtrt I rt cl tt tta rrltl f 28 TX RX unlt lB 21 O ot rl6aoat I I I I I rr I I 1 I I I II I I I I I lscatrt ol ttcaoat 87 AUXIL ANY fiNCUITS l Nolsc Bbnker I Configurdlon xottc IlA llllo GA e I Fcprlr prooodurc A noise g nerator is required to repair the noise blanker Connect the noise generator to the anlenna of the set Vsry ttre noise generstor output so that the S rneter of tha eet indicates about S 9 lf the set rs normal pulse noise is gliminated aod the 9meler lewl decreases when the NB NBl switch lurns ON This is becausc ttre bias of ttre noice btanking gote diode ie revsrsed if pulse noise occurs and the signal line breaks 1 Connect the noise generatoc turn the NB switch ON and check whether the NB gate dide outputs a pulse weveform wrth an oscilloscope NGll 2 Gerue the wawform of the base of the transisbr that controls the NB gote O22 B 3 Check wath an oscilloscoge whether the noise detectbn output changes aeording to the noise to12al 1 ls thc AGC amplifier ln the NB circuit working propedy lo17l 5 ls the noiso arnplifier functioning correctly O12 15 69 a
41. ciont the driw circuh is rlefectirre ll th l vel ts low check theVCO I ll tho drhrr mrdorar b not rqr rt ft lnpf ol th modulc See folbwing figure APC ope etbn Thie ligrure shows thst th drivc qrtput do3g nd gntcrthc rnodule unbss antenn diode D4 tums ON Since the anode ol D4 ls connoclod to the B line it rec iv s th porcr sup voltage The cathode of dle diode is connected to tho output terminal of the op ratlonel emplifier To turn D4 ON th cathode wltage of D4 must be no fewer then 1 2V bwer th n the B voltag duo to the output terminal of the operadonal amplilier It the r oltsg6 does not ctocrease onsicler why Forribleccueec 1 0 313 be3 not tum Oltl durir tanwniesirn ffhe grwnd pin of the lC is not grounded I 2 Rglil or R3O is broksn 3 O3l5 or 0316 docs not turn ON duting ransmbsion 4 The porror swply volrge ls notappli d to the lC 5 G 11 hasfailed There are so rnany posshle Gauses like these The TH 25G 261 end subsequent handy t raneceirors have similar circuit configurations lModsls wirh oconornicalbw pqpd It th power is not output aftor the final module is r placed check the obot e i ms TF78 AFGahcuh aa r amp lilrbn lluncbo3 qrcss l Fi st repbcc thc CTCSIi unit Verity thlt thr unit ic not 6lccthr Ir th tonc frcgrrcncy corrcctT 2 The SOL doee not opcn durirrg raclptbn Doe th AF signsl iler th RD terminrl Check whethor f
42. cro mputer or lC No c locks are genentd The microcomputer is not resst The data line has a break l f ilo dlcpley but rccaptlon lr nomal The microoomputer tunctions properry The display is amp feclive The display tube ls defective I I Abnormrl dbphy I EBgggS 9 I no reccpttron no nolta The micrcornputer does not work at all There is a basic proUem in the microoomputer operation For example Vcc is not supptied to the microcornputer or lC No clocks are generatecl The microcomputg is not reset The daE line has a breek t Abnomrl diQby I q t7g Eramplc but rccrptlon lc normal The microcomputer functions properly The microcomputer dbphy output data is wrong The lr0 or displaydrive lC is dafective The microcomputer l O RA n or ROM is malfunaioning I Abnormrldhptay l no rcccption The rnicrocomputsr lunctions properly Unlock display ffhe microcompute t O or PLL circuh is malfurctioning l I DirphV OK thc lrcqucnsy contlnucr lncrrering ordrcnalng The microcomput r functions properly The micropfione UP or DOWN key is k pt pressed The microcomputst or llo circuit is shorted MU MD I IrVrrrcnotecccptcd The microcomputer functions prop riy The key input O is defectirre The mbrocornputer or l O is malfunctionlng l 50 3 Nothing ir Dlcpleyed l Turn the power ON and OFF several times Does the display light even once YES The DC DC conveiler and the display tube are fundaoning prwe
43. drcult lr OIC drccl rr iollonrs t5 I How to chccl thc SOL cLcuh 1 Check the SOL volume lf th6 SOL VR s OK the SOL circuit is do ective TS 040 TS 59 T96Sn TS 50 TS 790 TS5O etc 6o TS 40 TS 950 T 950SDX i fnsoLM N V o I 2 Messure the SSO ling roltaga using the DCI M end turn lhe SOL VB from MIN to MAX Doas the vohogo chenge It it doss thc line is OK 3 Measure th bas6 voltage of the transistgr that mutes th AF lins and then lurn the SOL VB from MIN to MAX Doqs the t oltEgg changel It is OK if the voltags f owing bcnveon the b6se snd emitter of the transistor is 0 6 V or less when the SOL VB ie sct to MlN or if it is highor rh6n the vohage lO 6Vl that con tu n the transistor ON wh n the soL vR is sct to MAX I Howto chcck mutlog The mute signal is output to cur off pop noise when one mode i3 chaog d to onother or also 1o turn thc AF signal OFF during transmisgon The microcomputer outputs it when one mode ts changed to snother The D B or RL Eignsl is received during transmission Check the input to lhe mutng transisror or lC in rh AF lina before the AF VR The AF povwr amdmsr do6s not work 1 Check rhe Vcc line voltage with the DC VM 2 Feplace the lC 3 ls the resismnce of the resistor connected to the output rrsct ls the capecitor shoned 4 Chock th resistors and c pacitors of the negative reiurn circuit 5 Check th voltage of the input terminal ll it is abn
44. driwr base of the final unit 2 See the bvel of the pred iv r collector of the linel unit ThE collector level ls abqut five times higher then th6 b se lowl 3 See the lEvel of gach bss of the drive ransistor ol the linal unit 4 Soe ths level of each collector of the drive transistot of Ure tinal unit The collectq level ls sbout foor tirnes higher than th bolarel 6 tha bvel of each baee of the final transistor 6 Seo the bvel of eecfi ll ctor of the final trtnsistor Thc conecnor b rel rs abdrt ten tam s high r lhon rhe b se le rel ls there 6ny sta p in which the gain b lowT lf therB ls such a stage ch ck the bass bias of the t onsbtor wirh DC VM ls itebou 0 6V YES The output bad nny be too h tgh Chec the ouiput circuit NO The bias circuh or a trsnsislor in it is def ctive f Ghrcklog lor r dctccfhn Urrrirtor r SwitdthepowerOFF 2 Fernove the bese of the traneistotr For pushfull Wp rerno re both basss 3 Ponrer ON Mode USB SEND bunon ON lf at lcast 0 6V is applaed to the bEse partern the bias circuit is nortn The transi6tor is dgf3ctive It at hast 0 6V is not appl d o th6 base pattern the ransisbr B OK Check the bi 3 circuit ll a bhs adiustins variable resistor NB is provtded turn lf h csn be adiusted to 0 6V or high r the tias circuir is OK FIHAL Ur rT lX 5 r r O TS 4t0findunh tE I ll r clrcult brlon rc amp lvc lt ddctlvo l4
45. e circuit 4 D tuctivo DET diode or DET lC When checking e diode remor it lrom the bo6rd and check it in both lhe forwerd and reverse directions It thare is a problem p ior to point D Does ths carrler or local signal break due to vibrationT Point El Does the AGC voltage fluctucteT lPoint Fl Does any recagiliofl voltage such as ER ctange zt Poinl E D f ctlv lC Defadlva lC Poo conttct 8 Thc Sound is Low 1 ls thc sensitivity low tf SSG OUT is 6dBt and the VN tio is todB th sensitivity ic OK lf the S N rEtb is not 10dB go to the Low sensrtivity seotion 2 Check the w veform at tho posiriva sid ot the internal speaker lNT SPl and GND with an oecilloscqpe Does eny r vov torm gDpear at the posftive side Does any waveform appear at the GNDT A eryrlotm DporTr rt lhe GNO whEn lhe k wlrcis oprn Chcck rhc AF linc prior to the AF VR with n 6cilblcopc f ecdw th SSG OUT20dBFeignal 4 lf th AF oLrtput is 0 1 to 0 2Vpp the line is OK 5 ls the RF VR 3ctto MA 6 ls rhe AGC line OK S t th6 AGC line to about 3V when thcre is no 3ignal lt depends on the rylodel t Ag the receptbn signal strengthens th voltage of this line decraases lt is linally reduced ro abour lV 7 ls the CAF or LO s rgnal lawl conrtT CAR 0 5 to 0 8Vep LO 0 4 to 1 OVpp 9 S moter Since lhe S rn tsr op ftltes diflerenrly in SS8 ani and FM the checkpoint depends on th rnods Ercept B dn
46. e of the lbov freguencics ls the LO 2 frequency correctl ls the level sufficientT 2 Lo2 NO Other circuits are defsclir a 40 055 10 7 29 355M1 z aO 055 10 7 50 755M1 lz Point E E tilMHz about 40dB LO 2 must be one of the above frequencies ls the signal received YES The second lF tilter or the second lF ampll ier is deiedive There is a problem between points D snd E Check it with the iig The NB gate rnay b closed lf so check the NB circuh NO Other circuits Bre defective Point F 455kHz 40 to 6OdB ls the signEl received YES Ths LO frequencry is anaorecr ls th LO 3 fraquency correct ls the lsvel sufficient NO Other circuils are dafectlve Ch ck th lF fiher change crrcuit or tha third lF amplifier 21 I Errrngb l SO8Dl Supposc that the AF unh or lCl 1 b defective and ttre H642 frequcncy is incorrect t tnpur thc 1oOdgr tenal to thc antcnna r NG 2 lnput the aignal from the RX A tTlN te minal on the rear ol thc unir l2odBd 4 NG 3 lnput th rignal to RF unit TP 3 NG 4 Inputtlr3 73 G5MHz zod8rreignelbthc RF unitCN 7 MlF NG 5 lnput the 3ipal 6lF unit TP NG 6 lnput lhc 8 83MH2 50dBu spnat to TP Receptlon b gins ar thb tlmo lf lha signol is not reeivcd before being mixed but 6 received aftcr mixing the sign l is not beiog maxed properly 7 Check ths H642 frequency with 8 frequenca counttr 8 h is fqrld at tre H042 wrong 9 Ihe VFO2 in thc
47. ed thg bose and collector voltagos of 02 change The base oncl collector voltaEes ol 01 chang The baso voltages ol 0101 and 0102 change The eminer voltages of 0101 and 0102 are determined D oa lz st9 rrl ttJC s ru rlJa rata tvotl Dr lrtraJc rrz Sarl Dl rl t rJr t tr a aJc ora ItlalJo TYT JI c3 t oa TS 9 O Al B unh _g_ Qt ElLrtct Ctaa tlca lalv el e6ctrtttYt ca lacttttrot I Th volbgo o FB lllnrl Bl b hlgh or low 1 ls the Clz emitter vottage correct2 YES Drl D5 nd D6 are OK NO r D4 D5 or DO is shorted or a wire has broken The RG wire is broken 2 ls the 01 collsctor voltege corroct YES D3 and 01 ere OK NO Check D3 and 01 3 fue rhe Rl and R2 resistances conect YES Ql01 0r Or02 is defestive NQ The R l or R2 wire has broken Rl and R2 are tias resistors lor Ol01 6nd 01 02 1 The TS 940 i9 lak n 8s sn sxamde in the above dessiption but lt is the same tor other modeb Moet mcd elt can b repalred bv chec lng the btag td lstanaas of tha AVR transistot zcnor diod for voltage dctorminttion 6iae dcteminttioo trcntistor ancl AV R tranelston I Thc voltrgo d zaB tOA lr hlgh or law 1 ls ths rener diods D14 or D9 for voltage d t rmin tbn shortocl lf one of rhe diodes is shorted the ouiput go s L ll the diode wire b broken th output goas HIGH In either case b sure lo check the output transistor b csus it rnay be darn
48. equency AC current is suppressed As the capacitance decreases only high fiequencies are suppressod I How to Gtl cubt vdtrgcr d poante wherc no vohagc b rlroum L What is the dtage 6l poinB A ard B A 5V B 7 5V 10v 2 lf point A is 8 V and point B is 6 V whet is the voltage at point C7 What are tho voltages at points D and E c 61 D 5 3V E 0V r0V 85 3 hat is the rroltage at point A7 The 90K ohm resistor is sufficientf large End the resistance of the 10K ohm lesistor is considered to b about 1 10 that ol the 90K ohm resistor SincE 9 1O of thc t oliege is apglied to t he 90K ohm resistor the olEge applied to fis l0K ohm resrstor is about 1V 4 What is the voltaq at point B The 1K ohm resistor isquhe srnall as compsred with the 1 K ohm resistor Thus nrcst of the rrolttgp is applisd to the 1 OOK ohm rosistor tomling about r 0V 5 Whet is the voh gs at point C The synthesiled r sistance of the parallel l00K ohm reeistors is 50K ohms The difference b twson this resistancs and 47K ohms is 3K ohrns This difference may be Qnored and the rroltage may be considered to be halved 6 What is the voltage at point A 10V is output DC curent is cut by a capacitor ll capecitor is placed in the circuit thc current doos not flow diractly When S turns ON the vohage 6r A decraases Estimatg the vohages at points B C and E The 100ohm resrstor is ignored here and the collecto voltage is
49. erence between the phas s of the two frequencies is converted to DC voltage and output ro P Dout lf the phase difference between the h vo frequencies is zero proce d to 8 5 The DC voltage from P Dout enters the lot Fpass filter LPFI through which unwanted ripple compongnts are removed The resuhing signal enters the VCO 6 Since th VCO uses a wdable capacitor diode the change in the DC raohage from the lor v pass filrer indicates the chang in the capacitance of the varicap diode and it changes the VCO oscill taon treguency 7 R turn to 3 8 lf the phases of the reference oscillator and l N VCO frequencies match lthe DC voltag is always constant the VCO frequency is ahtara constant ths PLL is locked PUW 59 2 Unlock Check all the bands by setring the BAND swirch UP or DOWN I Only particrrlar bend frcqucncics thift Check which frequencies shift Tho VCO swirching frequency shlfts l Chsckthe VCO oscillation level of the last PLt bop Change tha band to another ancl check the oscillarion level ls thore any band in which the oscillation level is extremely low The output should be 0 5 to 1Vp p though it depends on models o YES The VCO ior that band is defective Check the oscillating transistor voltage and oscillation level The VCOs lor the other bands must stop oscillating V rify thet they stop oscillating The VCO rrny not oscillate steedity if band deta is wrong rNO Does any sign
50. g is described below 1 When ths filtsr switch on the panel is pressed a signal is sent to the microcomputer 2 The microcompuler transfers it to lC3 in the RF unit lDA CK LE as dQitaldata 3 lC3 decodes the data and controb the output pin OFF High ON Lo vl E I o a trlrEI lc 75 6 Automadc Antcnne Tuncr AT The automaric antenna tuner is installed betwggn the set wilh e 50 ohm output impedance end an nl nn with an irrpedance of mora thsn 50 ohrns to match their irpedances The impedance of the antenns matches es vie ed from ttre set The inpedance of the sm also matches as viewed rom the ant nna The antenna tuner is an impedance converter es shom aborre The euomaic antenna tun r matches the antenna and set autorngticel9 KENWOOD g autornatic ant nns tuner guarenE s ampedances of 20 to 150 ohrns S VFI botuYtcn lhc t and antcnnr tunal f fha tutomatir antcnnt trncr docr not work 1 check rhe cAB vR in the set lt sufficient powar is not provlded since the SWR cannol be cletocteo th antenn lun r will rot tune or gtrop tunlng 2 Set th t allows switching beh reen the internal and external antenna tuners Although the intemal antenna tuner is optional tha AT switch is set lo the internal antenna tuner Afthough the AT swatch is set to the externel antennS tun r th gxtarnal 8nt nna tuner is not oonnesled ffs 80 T 450 AT 300 gWBl b lrnon tho AToutput lnd nlrnna
51. gsion inhibit request fiXll 7 Chcck all th6 voltageB lhat chrnge during transmission I Trurblchootlng This repair is dilficult unl ss you have 8ome knowledge on transistor OwOFF function NOT and NAND circuits 7 ls any olt ge appli d to the collector of O49 No 8 Ooes the base of O49 go LOWT Y s 9 Q49 is clefective IN HIGH Swltch turB OFF g IN LOW ratch lu ni ON ouT v t a b c tQat d tNoFt o o o I 0 I o I o o Itrput ronag t outoutvohcoc t Exemple 2 TS 50 does not t6nsmit D73 b dofsctive See page 3e l 1 ls the TXB presentT lF unit TRX pin 5 2 Check th SS line lO52 basel 3 ls the O52 cdlector 8 4 ls the CTXB HIGH TRX On a 5 ls RLB HIGHT BKIN pin 3l 6 ls NSS HIGH BKIN pin 8 7 Check lCl 1 pin 10 8 Check lctl ptn 12 9 Check Q 9 pin 2 lo ch ct o49 pin 3 1l Ched Qa9 fin 4 Lowl 12 Check pln 18 TXl of lC1 1 in th digital unh 13 Ch c ihe UL line in the digital unit 14 Ch s the CSS lln ln rhe dbiral unlt 15 Chcck the coll ctor of O50 in the lF unit 16 Chcck the bose of O5O 17 D73 is dafecti OUT T gt a ai Thlr rwfrch lr OFF Thle rif irch ir Ol Exsmplt l TS 50 does not trensmit sigrnls O49 in the lF unlt is defeqtive See pag 35 1 l Press the SEND button and chec whether 8T ie applied to the TXB of the lF b rd 2 Pfess the SEND button end check whelh r the SS line lalb to 0V Ch6ck rhe
52. han 51 h is thc causs of this problsm Th citcuir oontains e zgner diode for Bxcessive rolurgo prevsfitiofl t I Tho mrtrr ir ofi roelo Make a dteck in ths gsm way as ebove tt n udog mcnr li urd l F any volt ge present at th PVVM terminal Of ths fiher unh M tqr chulgG lwitch POWER MOOE USB MICVR Ml N SEND ON 2 Sstthe tGt r to the ohm ange and apdy the probe to the fry tl ulrminal lf rhe power meter pointer mo r s the ci cuitt from thc termin9l to the rnoter a e nornrat Reler tg S Metcf sect xrn fha voltlg I outgut Do not Dut any clranger betwe n the emenna and dummy when adiusring rhe S1A R NULL Otherwise rhe minimum voltage point shitts a2 9 Break lN The TS 50 and suboequent modets are modularir sd Replecc nodulcs Feplac th nrodul in the order of BK S1A BK IN and DELAY BK SW This board sets transrnission conditions Signals Gtn be tr nsminod with a key when the C1A is FULL th vox turns ON or OFF transmbstom outsids tlle b nd i inhlblted or the C w ts enterld DELAY Scrs Oe delay time for VO ON or SEMI BK IN BK IN Controls the CTXB terminat on the TRX board acoording to the oondrdsts of fie BK SW aod D LAY boords 10 vox The T9140 and subGeguent s ts are modularipd Fi6r replaco tha modulss vxs Transmlsslon l csptton mrd lin wh n VOX ls ON This line goes lor r in rhe lollowing case The mbrophone signal oflteflt rhe Vr
53. he highest value in the range in which the UNCAL LED does not lighr The band width should bs about l00KHz roil aM 4 Observlng tho Harmonlc purlour Scan width 50 or 100MHz I nput atten uation 30CB The spurious cen be obserwd Set the scan width to a desired valua Set it ro ebour lMHz to sea the carriersignal level Set it to t0 m or 100MHz to 6s9rve the harrnon c spur ous Set it to I MHz 6 less to see the near spurious Locate the cause by cornparing the good set whh the bad one It is vary useful in measuring the 200 MHz and higher levels of the T 790 430MHz PLL TS 1 l HET board TR 5 1 and UT 10 The peak of the desired signal cen be obraio d by edjusting th bancl pass filter following thE mixEr circuit Do not cuppQ RF powar o thd input termlnal of the spcctrum analyzar Otharwlse the internal ettenuetor wilt hil Up to the drlve ataga level can be dlrecdy input roft 15MHe 9 5 Ghcck frc Gharactcristlcr ol thc Band Pese Filtcr With th Spectrum Anelyzrr A lrccking g nerator is reguired to observe tho charaaeflstbs of tha banGpass lilt r I Tfacung eroftof ouPur iirllra aa tar J I lf thc ap ct um enallzcr rnd tncking goncrlor r3o notrY lhb0 Measuroment can be performed by connecting the SSG bonepass fitter and oscilloscope as folbws Sat the SSG lrequency equal to ths centml fiequency of the bandpess fiiterto be measured Sat ttre SSG output to about 100dBF Turn the VOL
54. is 9V lf DC lN is 13 8V BB is about 13V and APC is hBher then 13 M Therefore the w r supply voltsge must be reduced to compare th voltages under the same conditions Example 2 For all rnode models the frsquency mode VOX BK IN etc must be taken into account For HF models the oltages usually are measured at 14 000MH2 USB Example 3 The TX power suge ALC line VSF and VSB line differ much depending on whether they are measured with full pow r or with rK power output Check whether circuit rariables have been chenged The circuit wrbbles shown in the manual should be ronsidered as thos6 determined during pre prduction They rnay be changed later See the STB for details Thevoltages shown on the circuit diagrams era very useful but if the rules Ere ignored during checking they becom oonfusing lf the actual sst vohags diflers much from th voltage on ths circuit diagram consider the abow mentoned items 5 Functions of Componcntg Diode Used lor switchiog reverse flow prev ntion voltage sening and detecrbn Transistor Amplifying and switching element FET Amplifying and constant current elemenr Resistor used to divide the voftage or current Capacitor Cut DC current and pass AC current As the capacitance increases low frequencies pass As the capacitance decrEases only high frequencies pass Coil Passes DC current but does not pass AC current easily As the capacitancs increases ths low fr
55. is OK lf the pilot hmp lbhB the vohage has been applied to the set NO Has the fuse blown 3 Open the case and msasure olt g s lSB CB 8C 8R 5C etc Are all thc voltages conect YES The po ver supply circuir is OK NO Check th pourer line Check t fie wltagcs lnput to ahe lF end RF boards lf dny of them eft i l caftect chect th line on th povwr supply boad ltthe voltaga Is stlll lrvofiac the powar guppty bosr t is dafactlvc f tha voncgc Is coficct thero is a problem belwcen tha powe suwty board and thc f rut d tr polnL 4 The poyvar supply circuit F OK but ths po wer is not turned ON The lt tisplay cirauit is defective and the pilor l6mp is broken Check the loltsgto et both ends of the pilor lamp Check the voltege of the DC OC nvener in th dbdrycircuit Conccptual dblram otpowff lha 3 Ponrcr L Not Tumcd ON lFormodchwlilt a rdrvor crrrclypo powrrrwidtl Exarnples Tl 27 TH47 T H 77 TH 2A TH 4E TH 78 TM 711 TM 742 TM 732 TS 50 lReceivers contarnang timers such es B XXI Setup Connect the power cord batter9 to th 6ot l B s t How to eset HF transceivers includiog TS 0 Hold down the AFB kBy and tum the powe ON All resetl Hold down the A B key and turn th polver ON trO reser l low to r set nrobile transceivers such as Ttvt742 l loH doryn the MR key and turn the power ON All res t Hots down ihs VFO key and lurn the power ON VFO
56. l SSB and AM The 9meter is operated W rh AGC voltage FM The meter operat s when the carrisr is detscted I Thr nrrtrr doc not opcrltC Obserue howthe S meter pointer mo res in SSB and FM rtpdes 1 The S mercr poinrer does not firovs st all in any rnode The meter or the meter hange circuit is defsave The connector has a poor contact 2 Com ct lhe tster as follorys B ducs th9 Ohm range ftom xl no to x1 to xlo lf th rn r r polnter rno res th meter is OK A 8ANGE r l Xl lt rt0o N 1 lf the rneter polntor doea nol movel Meggure lhe registance between the positive side of the meter rnd the chassis lf it is zero the S lt ngter line ls grounded Rephce the mgtgr n 2 With the power oN apply the tesrer probs to points 1 to 5 in th rs order Ohm range x100O lf the s meter pginter does not rnove this pcint may b def ctivo Example It the pointer mo es at point 3 but does not mot e at point 4 th part between those points s defective 1l Remore the CNA and apply the tost r prclbe ro the met r side ol the CNA 2l lnsrall the CNA refirwe the CNB end apgly the tcster probe to the bo6rd side of rhe CNB O lnstall the CNB retncwe the CND and appty the tesler probe to the board side of the CND 4l lf the meter pointer movea et this time th PCB3 board is def ctive I trtha mat r eo r3 gff tcab lkth nF oAlt vR tto MAxtt l Change ro FM ls the rtreter readi
57. led in the main unit assernbly line The parts l rstecl in the PC board list are instatled in the machine instslbton line insenion line and PC board completion line The lithium betteries for nrost filodsls ar6 instatled in the mein unit line They therefore are listed in the general list Since the lithium betteries for the TS 50 TS 450 and other models are installed on PC boards in tfie PC board assembly suge thery are shown in the PC board list tf a oomponent Jyrount d on a PC board is not shorvn in the parts list see tfte genersl li lf a pan install d on a PC boerd is not found in the general list see the parts list l Parls ttrt may h shoum in either list Temperature det stion th rmistot Transistors and lCs installed in rsdi torg Lamps Encoders I Fry rtlenrbn to tpllt boffd3 Examplc The TH 78 encoder is instolled in the TX RX unit but F not shown in the perts list of rhe TX RX unit The encoder board is designated as fi53 I as shown in the circuit diagrem See the control board to find the parts number of the encoder The encoder board is originally part of rhe control board but s separated from it and soldered to ths TX RX board There are many such cases Carefully check on which boards the psrts are installed 61 3 Adiustmcnt Before smrting adjustment read ths Preparation seqtion thoroughly and set up lhe unit correctly lf it is not set up corredly adlustment ol other irerns may be affect
58. lf e high voltage probe is available there is no problem in m asurernont lf no h tgh ohage probe ls awilable pertorm the measurement as follows l Connect a high rgsistance resistortoths positiv termin8l of the digital voltmoter in series We connected five 8 M ohm resistors wh rcfi have the high st resistance arrxlog the available resistors 2 The HV circuit voltage decreases to less than 1 000V and the vdtage can be measured lf there is another set for comparison the voltage can be evaluated by comparing the volteges t Howto Esttmd thc Voltagc Find or measure the high voltage rhat can be measured without attaching any resistors Vacuurn tube lype final B is appropriate l 1 Measure the voltage without attaching resistors Erample 850V 2 MEasure the volt age agein with resistors sttsched Example 600V 3 Measure th6 HV circuit voltage with resistors attached Example 950V 4 Assume that the ectual l fv circuit voltage is X gS0 600 X 9b0 0X 950x850 X E07500 Sl0 1345 8V The appro lt irruts voltago of ths h gh voltag circuit is obtained in this way Take special c8r to avoid electric shocks 2 How To Msaslrc t rc Radio Frequency Garrier Lavcl 200MHz or Highcrl Normally use a RF WV The posit ron of th RF VTVM pointer changes according to the grounding method inclination of the probe during measurement and application of the probe The carriar levol can be measured rnost accurately by
59. lrl cen be ccaily roedjuated from the panel wlthoutopaing the crlce Press the UP kev ro tirnes et 91 S and S FULL for the S meter or ALC0 ALC zone MAX and ALC FULL for Thg ALC rptor The voltages t tho thrse points ara stored in msnrory bV the microoomputer f the rec ived g rnetervdteo becomes one of the three rcltages the nfcrocomtnrtcr operrtes rhe S Eter b indicets 91 S 9 or S ULL lf the vdtage b between the stored rolbges the microcorrrputsr calculttcr and displcys an ideal 9meter curvs The voltages tt the three ints are stored in mernory by tho mlcrccomputer lf the ALC meter voltage becom s one of the thre voltages the microcornputgr oggrat the ALC meter lo indicatQ ALCO ALC MAI or ALC FULL lf the voltage is between the stored voltages the microcomputer calcubtes atU displays 8n idosl ALC meter curve c ao3 c IEo co E c o EI SEiG ou ur dBFl _84_ 4 Reading Clrcuit Diagrams Power supply line Red Signal line Black thiclc line Local signal Black dashed line TXB RXB Red dashad line When cornparing the volbge ol each part with the voftage shown on fre circuit diagrarn Check the condhions under which the voltages shown on the circuit diagram wgrg m asured Example 1 Tho highest voltage RB of the power amplilier unit which is shown on lhe circuit diagram in the TH 78 service rnanual is E 7V aod APC is 7V These voltages ar m asured when DC lN
60. n oscilfoscop to chec thern CAR 8AI 2 amp YB ls not supplicrt ro the roceiver tF stage SSB FM Af 4I Chcck the udt e of ttre rocaiver circuit FET or rransigtar 3 Delactlve AGC Chcck tho rclreg ol th6 durl gpte FET to whach AGC i apdled ilfXB let i is tV or tgv during tnnsmlscion bul Modd ndth common I ot gV ll comnrcn E ls tsv vCC b r omcr lW o highar 8 E drtocdon cfocrrft 19 wc 7 gV AGG or MII Fl 2 3rt Bir3 1 2V lnput t 2v 2 Slgndr rre llot Roodved Noha ls Outgutl Set frequeocy 14 100MH2 USB mode SSG frequency 14 101MHz Make iig like this The capecltor is used for DC cuning Uta capacitor with hl capeitrnca so th6t it mty be used for HF to UHF ToSSG 1 lnput a 10OdBg signal from rh SSG ro rhe anrennE Does the transcailer receiv it YES The signal line is broken or tho mixture level is wrong NO The mixturc frequcncy i incorrcct The pLL frcquency ie wrgng Pol lt LOr Folnt AB Point LO2 Polft co Polnl LO3 Polnt EF ctnnad to GND otlh Gt The elligalor clip doas not grounding See the ligure undsrstand the connetbn provide sufficient below to bensr Gr o 2O 3 Connoct lhe SSG to the jig and input signals to each I How to cllculrtc LO t LO rld LO frrcprncl poinL Fix th set frequ nqy to l4 lOOMHZ SupposE thar lhe lrequencies ar as follovvs Thg sot lF frequencies ere as f olkcws S t dispby fr quency l4
61. na Ylthon tlr wrl bla rdEtot lvRl h lu n d clochf lt r ilnL th polntr b ginr navlng o 6 Thc Mcx FoYrrur ir Low Connect the set diractly to the Dorver mgter from OUT of the linEl unir lncreaee the CAR VR skrwly outputs 170 to 180W ir is OK about 2001i I Caudon ln is case ALC end protection do not wo k It rhc ouFut fpvver is too high tho finat trensislor fails Decre se th CAR VR to reduce ths powsr imncdetely aftor lcrifying at e moximum power c6n be ouprjt 7 SUVR Mstcr When th A R meter feils lhe diode in rhe SWF d tgctiorl ciralit tails in mosr casos Th6 imponant point fo r troubbrhootirrg SWfi dctods is the VSR terminal cf the fitter unh 1 As the w r increases slowly the VSR votiagp incree e gredually 2 The VSR roltage is edlusted to the minimum widr e trimm r and so on when th antenna t rminal iB rerrninated with 50 ohms Refur to the Low Powe on page 37 Pey enendon to lna cufi ot capscltr of the pvwr swP v It the wl reupply hes a red zonc of 2i2A aN the maximum curnant of 264 thc power can be nlsed to up to about lOW end currcnt grotection is actlvttcd ll you arc using such a powq suppty you may coasldar t l ttc fincl unlt is OK fi th Emmettr gops off olo and thc itf icsfptr charug8 ft m N a cc Topolrrnlg 3 lf rhe antcnna ts rminal 6 65 ohrns not 50 oh ng tho VSR voltage increasee lor en additional 5 ohms when crmpared with th vohage
62. nd waw orms Presetting type I Res t both the gpod and defecriv sets 2 Set the AUTO THROUGH switcn on the anTenna tunBr to AUTO 3 The variable capacitors will b set to the initial positions Check the positions of the sets of blades of rhe var Bble cepachors of the two sets li they are almost the same thgy are OK 4 Disconnect the power lines of the two antenna tuner tnobrs 5 Press rhe AT TUNE switches on bolh s ts and cornpare their vohages and waveforms Note Connect a dummy to each of the two sets and st8rt ant nna tuning lf I migrnatch alert tone sounds turn the tuner OFF and ON again This procedure is useful ln d tecting incorrect capacitarre of capacitors Exarnple IAT 5OI The motor po er suppty has baen soldered 1 Resat the tr o sgts 2 Desoklerthesol 3 The vohages and rrraveforms can be checked while tuning ATUNIT 79 _c D E F G H I J K L M N o Po R s T U V W 2 Rules for Pattg Llsts r The gcnoral llst The general list shows ths perts numbers in ascending alphabeticalorder lA to Zl Example A12 345G03 J w02 1453 05 I Tht lkt of PIC bocrdc The list of PC boards shows the initial letters of reference numberg in asc rding alphabeticsl ord r A to Z Semiconduclor3 are listed at thc end of the list Examplc Cxx CK73FB H102K Chip C J t VBxx R12 443 15 Trimrning pot Sxx S3l 45e05 Switch Do RLS135 Dbcl lCn NJM2902M lC Oxx 2SC2712lYl Tra
63. ne of the PLL lC and check whether a digital pulse comes lrom the digital circuit lf a digital signal is present the deta line is OK 2 Check ell the cK DA tE SCK and SO data tines 3 lf no dsla arrive at a data line c heck it again wiih an oscilbscope 4 Turn the encoder lf d6te b tound the lin6 is OK 5 lt not change the rnde lf data is detected st this tim the line is OK 6 lf no data is found turn the power OFF and ON again soversl times lf data arrive at the line it is OK lf a dlghal signal enters eEch PLL date line the dam lines are OK lf no data enter a tine lhat lin is defeaive The data output VO is defective or a wirs between the l o lc erd PLL lc is broken tl llow to chrc the PLL Data Llnes P Turn the set OFF Each PLL lC has a data line a clock line and an enade line Examplc lf lhero are four PLL lCs DAO to DA3 CKO to CK3 end LEO to LE3 data lines are connecred wirh the PLL lcs cK and DA lines may be shared l Check rhe r sistance of these groups lpositil e anO negotiw poladties The lines of each group must have ahost the sarne resistsnca f tre resistancs of one line ditfers from the others tlet fine is defectiw Check the lines by referring to the digital circuit section on page 55 6t 5 TIpt for Rcpair For Repalrlng pLtsl 1 The tevels of input pins 2 and S of the mixer lC SN16913P must be alrnost the same lf there is a large difference between fiins 2 and S lwo VO
64. ne ol the band at whach the symgtom existe Lightly ttp tho TX RX change etqr ce3 with an ediusring rod ll the eyrnptom ie confirrned the r lay Etay be faulty f Poor qrir q locrl efirl conna amp r cortac Check the MX FET input l v l wirh an oscilhscope a I 46 15 Hlgh Nolct ll norse oocurs during rnoduladon perform dreck as tollo vs lA hile monhori4g wirh another reoeiver 1 Grcarnd the m rcrophone input terminal 16 Mobilc rnd Htndy Tranrcrfurn t Do narrrtunrhrl3nrlr Do s rhs ON AIR inditetor qn t on the disglay when pressirD the microphone PTT key Laeht The transmission request signal entsrs the rnicrooor muter Th transmissbn r quest sbnal is thEn converted to digital detg and is sem to the shift regisrer lC and pLL rc in the TX RX unit These lCs docode e ctrta nd r verse th voltag3 of tho nsrnbsion rFcaption swibhin0 terminal TEl The T e line is connsqt d to the trEnsmission power lgfl receptirn power 8Rl switching circuit So when rho T B voltage ig reversed the 8T 88 voltage is r wrsed Chrck t gT prsaant du ing ronsmission YES ilo transmbsion po ver is ourpu Chec the dtive ixrtput or lrcO output see FItgE 37 1 l lO Check the PLL module LD rerminal or thc shift register T B terminEl LO OV when tho PLL ia locked High whon it is unlocked TIR r0t in transmissi lt rn moOe High in rcceptbn mods 2 lf the LD is abnormal check th6 PLL circuh S
65. ng reducedT YES Defective in SSB onlv NO The entire S meter circuit is defective 2 Tha meter is off scale in SSB only Enter about signals 40dB to the antenna lrom the SSG Are the signals receivedT SSB YES Only the S meter circuh is defective NO The AGC or powar suoply circuit is d lective Check the AGC vdiage Most s ts balance the positive and negative voltages of the AGC circuits lf ith r rroltage is absent rhe meter goes oft cal 3 The metsrgoe6 offscde in botfi modes Check tne RXB common powsr supply voltagca such as 8C and TXB lf lXB is ap pliod during reception the ALC S1i R PBOC or Fr VR lC meter mey rum ON So check TXB Thc S mctet edjustmenr tn SSA ie E little complicated Adjust the S meter ts Instructed in the Sanice Manuel lf the vtttEble resiator or coil used for t l ddlustment siifis cxcesslvely the AF output or sensitlvity may decraa lO Cro s Modulation Advbe the use to use the ATf or AIP switch The BPF change ctiod for reception may have falled Check the diode lf the BPF3 shown in the bove figure is rhe current bsnd only th BPF3 diode ghould turn ON and ths otheE slDuld turn oFF lf rhe BPFS diode fails the signal passes through the BPF3 and BPFS causing crog rnoduldion zg 11 lulobilc and Handy Tranrcclvcrc I ltlo round output Ch ck whh en ordllocoopcl 1 Ch6c whetherth lF lC OET ouEut Gonteins nois9 2 tf ths lF unit is modularized
66. not enter the microcomputef t Bedace rhe mioophone Transmit The microphone is defcctive tbag not trtnsrnh The PTT line is defedive 2 ls any votoge applied to the PTT line YES lf the vohage becorms O y when th PTT turns ON the microcomput r is dct ctlw lf the vottage do E nol ohangs check the ground line NO The pull up resistor ig delcctive The microcomput r port is defealve The capacitor for high frequency sneaking proventbn as shoft d Check tie ground line I G ution The MIC conn ctor has two ground lin s One is ussd for the oudio signal ground line such es microphone ehield ard dssignstsd as ME or MGND The orher is usEd for corrtrolllng the UP DWN and PTT end is deslgnated as E or GND Thes two ground lines are not connect d at the MIC side in ord r tg prevent transmrss ton rrctse They are grouncl d et different locat lons n rhe msin unlt ide Th resistanceg ol th turo lines wlrlcl E 9 measurod with c t6ster tre zcro l The connection locations depond on models MGND is grounded at a point whcre the trammisJon noise is minimizcd at thc tlesign stage I When checklng rha ground consid r tho two ground lincs sufficbntly GON BC UT T fnrut LnC O l O k gterldd lo tln T ll3 unt IT RX Url T ooNlaor uNlT lx nr ul 17 alrt t t EC CillD ir grtunrtrd ln ttra acnrol unll The c2 lt tomrl MIC GND ot the handy trontcetv r ls supplled fton the ground ol the encrnal c
67. nrittufty r rccking llg to thc SSG output and touch ihr tast point Examplc t 02 input t rminal The AF owput increases or decreases lf ths AF output increases ReducE the SSG ourpul and s t the AF outpur to 0 6 lv Example 2 Suppose that the AF output increases from 0 63V ANT inputl to 0 75V O2 inputl lf the SSG ls reduced and the AF outprlt returns to 0 63V at 2 5d8 2 5dB is lost in the circuit from Q2 toA lT lf the AF output decreaseg Increase the SSG output and sst the AF output to 0 63V Example 3 Suppose thal th AF output decressss from 0 63V ANT inpull to 0 36V Q2 inpinl It th ssc is increased and th AF ouput returns ro O dil at 3 3dB there is a 3 3d8 gain up in the circuit from 02 toANT Nolc There is no arnplifying element in the circuit from ANT to 02 but 2 to 3 dB are gained or lost due to matching ol the impedances of the j rg and circuit I Ghcck th dillcrcncc brtrrocn thc Ol2 lnput and Cl3 output g in3 C lculation s carried out with an example 3 Wh n ths SSG signal is inglt to 02 input at 3dB the AF output is 0 63V Connect the jig to O3 output lncreasa tho SSG output so that the AF output becornes 0 63 at 18dB The gain is 18 3 15d8 The level diagram shows that the gain is 13 0 13d8 Since the ditference is 2dB this circuit is OK I Mirlngloro of lst mlx Connect the iig to the L56 input snd adiusr the SSG output sothatthe AF output is 0 63 Assume rhatthe gain is l4dB
68. nsi stor THxx 157 501 3009 Thermistor f Thc lnhlaf lcftcrr of partc numbrrr ln thc gcncrl fnn lndlcatc a oups of prrts A Front panel Case ChEssis etc B Front glass SP samn Nameplate Meter Larnp etc lnstuction manual Service manual Wananty erdllelrct Capacitor Extension shaft Connector Cable Grounding fining etc Fuse Fitting etc Spring l cking Cushion etc Packing rnaterials Feet Lesd holder fitting Wire harness bard Spocer Handle and Knob Transformer Coil Filter Crystal Scr ws and Nuts Resistor Switch and Relay Speaker Microphone Motor Asscmbly Encoder LCD Backup battery The s cond lrom the last digit of the parts number indicates the number of minor changes of the Fnrts Old and new parts are besically compatibte with each Othor but som perts E re not cornp6tible See the STR for details Examptc A2S2634 O5 A20 2634 15 RZ 1t Reasons for minor changes lmprove el ctrical and mechanical pertormance change of paro supplier etc I Thr gcnar l lilt rhows romr cornponents lnstall d on borrd Example Lithium batteries The lithium bafieries for the T 790 TS 850 and TS 450 are l6t6d in tha list ot bosrds The lithium baneries for the other rnod ts are listed in the general list They are difierendsred ss scrne ar installed on the PC boerd lina and othsnr ar installed in the rnain unh ass rnbly line in the plant The psrts listed in the general lisl are ins l
69. on dre 50ohm lnrlrr dBmscslc Fead the upper ecale lblaakl lt is 0 71V and 2 24V Since the range changaover switch is the 0 3V range read dre lor vet line of th two bhck lines ffull scale 3 l2 24vl Since the ful scde value is 03V in the 0 3V rcnga 2 24V is 0 24vrrns VOLTS dBm VOLTS dBm 3 To conyert SdBm toVrms The maximum value of tho 0 3V OdBm range of the range changsovar switch is 3clBm on rh dBm scals Therefore SdBm cennot be nvened to Vnns Set the range changeover switch to tV l0dBrn range When lhe pointer indicates OdBm this point is 10dBm as Ue range changeorer is lOdBml To obtain the value for SdBm move the pointer to the negative sida bV SdBmfrorn 10dBm Read the dact scale abore the pointoo the dBm scale 0 4 end t 251 Since the range changeovcr switch is sct to 1V 1OdBm the full scale wlue is 1V Read thE black scale value directly r 5dBm corosponds lo o 4vrms It can be m asur d whh an oscilloscope by using an equatbn Vrms r 1 11 Vp p lf you ryEster thsse methods you can obtain data requirad for repeir from the level dlaglams S Optlonr The pofts numbers and characteristics of fihers ere given in the circuh description The optbns shown at the end of this manual rnainty are those whh elsctrical circuits ff 91 ADDITIONAL INFOflMATION I To prevent repeated repairesl 1 TS 930 TS 940 I Thc final unit cmltr cmoho rnd trenrrnlrdon poYvc ls not o
70. onsceiver 6 Check the data line that connects the main CPU and subCPU 7 Check ths soldered parts of the micr omputer Before soldedng th n again tle gure to unplug rhe poi er cord of the s6t Before applying the soldering iron tip to microcorrputer leads apply it to the ground once fto set the potentaal of the iron tip equal to that of the se0 L lf an LED stalrs lit Check the waveforms of the key outpul end key retum telminsls vyith an oscilloecope 9 lf tho cartransceivsr has a detachable panel replace the p6nel ass ntly Check the voltagE of thg conneclor and the waveforrn of ths data line When it is checked by orning the encoder AF VR or SQL VR digital data definitev rs orrtgut from Sl and SO lrl li I Cld amp flr lcdctcoolJ Mdrrrli Fdor F Sft 57 PLL CNCUIT I PtL The Pl L circuit generates fie frequenciEs required lor transmission and reception whh the transceiver I Oporaion 1 The reference oscillator produces the reference frequenoy and sends it to the reference oscillator INPUT of tha phase comparator tP D 2 The VCO generates free run frequencies lt does so even if it is unhcked 3 Part of the VCO output go s to the divider UNl Dlvision datE from the microcomputer enters the divider end the VCO signel is divided according to th microcornputer data 4 The phasE comparator lP D cornpares the phas s of the ref erence oscillator and Frequency clemultiplier outputs The diff
71. oo oo oo 76 I Thc automctlc rntcnnt tuner docs not stoP l Gdorcc rotetlon tvpcl lf the set of blades of the variable cepecitor rolate 360 degrees check the rnotors Do both the X and R motora run lf either of them does not run el ell check the motor voltage ll the voltage is correct the motor is defective lf the volragp rs incorrect the rnotor drive lC or a circuit befote il is defeaive Volrages applid to th positiv and negatiro termanels of the molor 0V W or 14V 14V I Tror6lcrhootlng tfrc AT board How to measure the rcltag s and waveforms of lCs in the antgnna tuner lt is difticult to repair the AT board if another ATboard is unawileble forcomparison TyFe of which the vrriablc crpacitor ht t cct of blades thet rotot 360 degraes 1 Set the sets of bhdes ofthe variable capachon o th turc Entonna tungra to al nost ttr same position and unph8 the powsr lh of th rnotor 2 Start the antenna iuner of tho gpod sst with the open antenna and unplug ths power line to thG motor at an eppropriate time 3 Set the sst of bladss of the var rable capacitor of the detEcilve set to the same position as that of the good set as follouo 1 Disconnect the motor connector 2 Apply about lov to the rnotor to activate it Stop it if the posation ot the s t of bhdes of th e dable capacitorof the defective sgt rn tches that of the goodset X R 4 Stsrt both of lhe anrenna tunsrs and oompare their roltages a
72. ormal desolder all the connected pars and sold r them ag in to locato the defective cirGrit I lVlododnngpdrcuh There are trwo typ s of mode hange circuiB one that chcngcs rhe mode with a diode and another that ch6ng s h whh an lC switch The TS 14O circuit d ngom from the detection circuit to SPOUT ig shown on the nexi 9rge The TS 140 SQL is effectivs in FM only and O58 is turned ON and OFF by the vdtage at lC6 pin 13 The mute signal rnak s CN3 pin 9 MUT HIGH and mssos through D70 to conlrol Q57 ln transmil mode CN3 pin 14 BB and Q43 OUT 9o HIGH tosonrolDllz and O57 ln SSB mode TXB and O55 input go HIGH the o tput goes LOW and lC7 2 4 tums OFF f he mod changs circuins changed by lC7 in AM 4 41 ssB w4 8N FM 3 4 AM modo lC7 pln 12 gocr HIGH rnd tho odla prns go LOVi SSB modc lGl pin 5 gocs t lGl snd thr odrir pins go LcnA FM modo lC7 pln 6 goes HIGX rnd the oilr6r Dlnr 90 Ldl Circuh rre lile rhis SOL MIN 00 600 r sor MAx 10I l 1mko ThO AF of tho 17 More accurately if the vottage chengas mute irentittor mey be defective If lt does not change checr the vottage Neceditg clrcult by chenging the SOL y8 Thc TS llo cbcuh dlrgnm lrom toro dctrstl on drcrrit to SPOUT lt l I lf r du t plor to fi ffion drqdt le d r saho Examplcs of typical probtems 1 CAF is not iflDut ro the detectbn ci cuir No noiss rs output i r SSB onty OK in FM end Alvl tJse a
73. ornt C and enter the lF trequency 40 055MH2 60dBB Apply the j S ro poinr D and enter the lF freguency 40 O55MHZ 2odBFl Apply th jig ro goint E and 6ntor th lF frequsncy 40 056MH2 20dBtr AppV th iig to pornt F and enterthe FF frequency 14 100MH2 zOdBtd You can ftrd the bfectivo poft by checking the pdnt whcre the fteguenoy begins to shift tt L i tIt I I Ylr one Co 7ccl 6 Thc Rcccptlon Tone Brceks 1 Subject tha s6t to vibrstion The raceptbn tons breaks when the s t is subiect d to vibration r The compononts have oot b en securev soldEred to me board or conneclors have poor contact 2 Connsct an sxternal speaker and subject the sst to vrbratioo The reception tone breeks whEn the set is subjectod to vibrarion Somc circuits before the rternal sp 6ke rney be detective 3 Subi ct th set to vibration while observirp the S meter lB ceive signsls at sbout S 9 The S meter lndicatlon changes largely due to vibration The AGC or powe supply circuit is doleaive 4 Whila subjccting the set to vibration observe th wcvelorm t ach point from point A with an ocilloscop Oscilloscopa VOLTTDM SOmV lnputr AC Sweep time div 2na LO LO 7 Rcccivc Tone Dbtortlon Check the pointg A to D in th9 same r y a Pordbh dctosts 1 Poor cootact of an external sp ak r End phone 2 Dclcctive AF gowar amdifier or AF VR 3 SOL gate mute gple or mode chaog
74. ot be Adiusted 9 5 Example l0 ll l12 r 6 Models That Can Use Two wav Power Supplies TS 71l TS 81l etc 13 RECEPTION CIRCUIT 1 No Reception No Noise r i 15 Thursday December 25 1997 9 57 PM I E INDICE MANUALE RICETRA SMITTENTI Page 2 of8 16l17l rslre 2 Sisnals af e Not Rec ived Noise is Output I 3 Receiver Sensitivitv is Low 22 4 The Reception Freque4gy Fluctuates and The Reoeption Tone is Wrons 23 2 5 Frequency Shift 25 6 The Reoeption Tone Breaks 27 7 Receive Tone distortion 27 8 The sound is low 28 10 Cross Modulation 29 I l Mobile and Handv Transceivers 30 3r Thursday December 25 1997 9 57 PM INDICE IVIANUALE RICETRA SMITIENTI Page 3 of 8 132 TRANSMISSION CIRCUIT 33 l Transmission is Impossible 34 136 2 No Transmission Pow er is Output The ON AIR Indioator Lights 37 2 Low Power The ON AIR Indicator i Lights 37 8 Thursday Deoember 25 1997 9 57 PM INDICE IVIANUALE RICETRASMITTENTI Pase 4 of 8 ll PRoc Processor 43 12 Transmission Tone O ualitv is Poor 44 13 tlefective PLL 45 14 Power Fluctuation 45 15 Hiqh Noise 46 16 Mobile and Handv v Transceivers 4
75. plex regigtor Pins 2 to 9 are connected lo th micro cornputer data linas Measure the resisrcnces with respoct to ths ground Apply one test r probe to pin 2 and measurg the resistance of pin 3 pin 4 pin 5 pin 9 Apply onB tester probe to pan 3 and resistarne of pin 4 pin 5 pin 6 pin 9 Apply ona test6r probs to pin 4 and re sistance of pin 5 pin 6 pin 7 pin g Extmplo Exrtttlry c ol tttc bed wcvdomtg rYl asur the megsure ths 1 Measure the data line resistances in this way DATA LINE Assume thet each date lina runs from one adge to the other of the dlgltel board Therefore Dl may become adlecenl to D7 In the pattern Dl and D7 nay be shofted thoctgh it rarely occunl The above procadure checke for this problem 8 Chccking UYavcforms UUith thc Pows ON Waveforms can bE checked whh the power ON though it depends on models lt is dvised to comparo the wavetorms with those of anoth r s t it av ilable Oscilloscope DIV 5V or 10V Sweep Trigger point 1 Remove the ROM 2 While monitoring the microcomputer data line turn the porv r ON lf no waveforfir aggears on the oscilloscop turn tho pot ver OFF ancl ON agrain When the power is turned ON and OFF several tim6s a waveform is displ8yed 3 Obsarve the wavetorm height rising edge and overshooting d the data and address lines 9ornc dcte hhrc hllf lho ours lrYll of tha normll drt No ovorchooling
76. qeaker Sioca tha exlcmal miaophone iodt does not hevc a graun4 tht erd msl PTT atnnot be openatod iusa by lnwttlng ths plug into the mlcrophone aonnactot oaly The SP GND musa alweys bc connected to dtc FTT clrcuit I Thc tnmmbcbo pow b lnlrllicbnf 1 Conn st a pour r suogly wilh an ammeter to the trenscgfver gnd gter transmi 9ioo 2 Obsarve the amr noter on the power supdy lf lhe ammetcr indbates the tollo ring valu the povvat rnodule s Ol SO fi rnodel 6 A 2514 model 4 A l0Wmodel 2 5A 6Wmodcl 1A A wire betl i on th rnodub OUT and the e ntcnna b broken 3 Chek tho rnodule voltage during uansmissbnl INPUT The rottago is diflerent from y del to model Refer bthe SerubB Manual o Jlt APCIDB S 5 R during transmlssion lt drls pin is used for APC roter to the Service Manual r VCC Power sryfly roltago s applied to the VCC This line is directly connected to the power cord Rernove tho porver cord belor sucking solder lOfleffilse the fuse will blow l OUTPT T Th 1 AV DCI Uas is apdied to this output terminal lt depsnds on models l OUTPI T D B VCC OUTPUT 47 4 Ses the wavgform at driv OUT lUse an oecilloscope lor up b 144MHz aM use 8n RF Vr VM or spectrum analyzer br 490MHz or higher lf the drive lewl is OK the npdula is defectiw ll the drive levcl is NG chect the powei supply voltoge et the drivs stlgc 5 Chsckthe lewl of ttp driw input tsrminsl lf the lewl b suffi
77. r rnay be kept pressed mschanically or electncally Press it again 3 lf it is not rnechan rcslly locked it is electrically locked I TrouUrghooting The TS 50 keyboard unit as prorided as an example on th next psge lf the transcgivgr is not recet l Unplug th power cable with the po er switch ON Bemove fie battery t 2 Hold down the reset key and plug in the power caHe Reinsralt rhs battery 3 Fe t the transceiver 4 Chsck th mhreonputer or l0 lCs 5 lf fiets is a soare boad use it to leplace the board Other boar amp rnay be dofective When the Atvl FM key is preesed K3 and 52 lines are connected rough D3 Kty chccklng procedura I Tssterl ffurn the powor swhch on the set OFF l Connea the tester to K3 end 52 Press the AM key Ohm xl range Does the ohmmeter operate l not change th polsrity of the tester and nuke a check again The ohmmeter should operate this time H not the dirde or swnch Ls defective 2 lf the ohmnEter op rates an both css s rsmove thg flat cable frorrr the digitel unh and rnske e check agBin It the ohmrneter attlop rstes in both cases th kEybogfd boad is defective 3 lf the s t bocomas normal 1hc ohmmetel opentes only with one polarity by remwing the flat cable fthe ohmrfloter pointer mons only oncel the drgital boad is defectiw ls any l0 lC lead shofted Check all e other keys in this way Example lf the MHz key is helcl doarn K4 and S4 are connecled
78. rd b OK reinsall it 6 When wiring is comploted turn tha power switch oN 14 20OMH2 Mode USB CAR MlC PWRVR MIN Moniror the voltags across R38 with e digital vohnpter and flaft transmission I Blr cilrrcnt ldfusnctrt 1 Set the wltage to about 1SmV wirh VRz l 50mA 2 Appty the digitll voltmeter probe to TPl and set the vohege to about l60mV with VRl 1 6A1 3 Leave the set in lransmission rnode for about 30 minut6s lCheck the voltage across R38 frequentty lf it exceeds 30mV reduce it to 20mv l 4 Final adiustmont of the bias currenr labout 30 minutes bterl Set the rrohage across R38 to 2OmV with VRZ and set tre vohage ocross TPl to 170mV with vR I G ufioa l Oo not output full parer with the shi lding plate removed There is no probbm if tne output is about 10uv bur the final transistor will fail il tull po ver is output 2 Before installing the shielding plate swirch the power OFF lf eny meullic obiect strikes the DRV lN of the heat sink in transmission rnod the finel transistor will fail 3 Do not crash any wires when installing the shielding plate I Oprntion conllnnrtioer 1 Close the heat sink of thE linal lransistor and connect th6 DRV lN and OUT terminals on the rear 14 200MH2 Mode CW CAR VR MAX Pl F VR MlN VOX FULL SW ON Transmission 2 About 10W is output lf nor dher perts also are defective 3 lf power is output increase the n VR VB graduelly lf the ALC has been adjustsd correc
79. replace the rnodulb lr contains th SOL circuit l 3 lt nobo app ars in tFre lC output o lF module BA chect the input and outgut of ths el ctronic va iabl6 resistor VR ll the input is OK but th6 output is NG the eleqBon c variable resistor Vn tC orthe control line is defective Data is lnpu to the cont ol lin Ch ck the data line while turning rhe AF VF It d te is pro3ant the lin is OK 4 ls c PLL unlocked Check the LD line of tho PLL module 5 The dual bond rmdels contain an lC thst swnches the AF 3ignalB MAIN and SUB Does it work corrocrlyl 6 ls th TXB low f Poor r c ptloo llow nrhirhll Perform troubleshooting with a iig See pego 31 The FF amplilier t the first stag e fuils mo8t often Poor sensitivity of 10 to 20dBl Reason whv th RF ampllfier st the firat ilage oftcn feils l Vhen a sEnol as tronsrnined forward bias is applierl totnngmissbn receptlon swhchirn diode Dl to turn it ON Diode D2 Oat protects th6 lirst r6ceptbn stgge also lurns ON Therefore thc RF signal from th module is grounded by D2 and not applied to RF amptifier O1 TtU 41 porur ariGhlng clrcoit 30 lf no bits is applied to Dl or D2 tor some rgason or other Dl or D2 is OFF as shown below the dioOe gorves as a capcchorl RF powcr goes ro 01 and d stroyg it f O b dan god ool amp r R egain futpld Iathcfirstclogo mayfail duoto e problem in dE arrnsmirarion clecuit so vefitythat ell the lCg In t he
80. rly The display drivcr circuir disploy data circuit or dimmer contolcircuh is defective NO check the input and o put volfrtgss of the Dc Dc converter r There is no input vohage Check the pow r supply circuit of the DC DC conwlrtgr There is an input voltage Has the oscillating transistor of the OC DC conveftar failed Rsmove the transistor from the boerd and meaSure its resistanco with fhe ohm range of fie tester 2 ls the oscilleting transistor functionirg Chock the transistor collec tor with an oscillmope NO Replace the tra nsistor Ch ck the output diode bdctg Renrcve the four diodes lrom the boarc and m asute each of thEm The DCDC converters of ths TS 140 and TS 80 are nrcdularizsd lf the DC DC corilrerter is suspected replace h 3 ls any t oltage applied to th tilam rtt of rhe dbplay tube ls th zener daoda connected lo th filament shorted lt th about 5V zener diode fails SHEBAE is disptayed Check the vohage at each terminal of the display tube Negative rcltagresl lf the same voltage b applied to the terminals the drirc lC is not working Check the drive lC input with sn oscilbscope Tu n ths encodsr end ctpck the dst8 line lf eny data enter the data line replace the drive lC 4 ll no data entd the line Check lhe date lina with a lesler iFrom the micro mputer output to the driver lC inpul r tcD Neur models use LCD assemblies Replece the LCD assemUy lf th model does not
81. rt betwoen lhe micro computer and the displav drive circuit Models wlrh an LCD Replace the LCD assembly You can see whether the LCD assembly or the digital circuit is defective lf the transceiver does not havg en LCD Check the voltage and wavefqrn ol the connectorE between the LCD and dbital board 5V 8ty DC VM data line bscilloscope AppV the oscilloscope probe to the dsts line and turn the 6nctder lf the dat waveform changes the digital circuit is considered to bs functioning properly Modele wirh diodes LEGI ls a voltage present cotrrmon Et lhc LED ls a roltege appliad to the drive E and trans lstor 2 How to Chcck The Microoomputcr l ls the microcompderclock o rtput 2 ls a vohage applied to the microcomputer ly O RAM and ROM 3 ls a voltage applied to the RESET pin of the microcomputer 5 V lLorr for sorne mod ls Turn the ps yer OFF and check the waveiorm with an oscilloscope 4 Observe the ROM CS enO CS2 pins wirh the oscilloscope lPulses sre output from the pins 5 Observe th6 date and address lines with the oscilloscope 6 Check the lNT WF and FE with the oscilkrscope The microcornput r can be checked in thls way You should verify how the microcomputer runs and where the pogram stops to isolate a fault f No dbpby no recaFtion no nolse The microcom ltBr does not work at all There is a basic problem in the microcomputer op ration For example Vcc is not supplied to the m
82. s do not match exactly Examples TS 770 TS 780 The STR lService Tectnhal Rsport has been issued Fead it beiore staning acljustment T 770 No D0 8G1O92 1081 1501 TS 780 Market quelity improvemenl r quest No SC4lll lJuly27 1983 ENI or EN2 12 5 lf the ENI and EN2 waveforms are correct The waveform rectafacation circuit gare lC or microcomputer in the control or dbital unit rnay be de ective w 6 lf reception or transmission sometimes fuils when the VFO encoder is turned The part of the vFo indicated by the arrow has poor contact Polash it cleanly since tha rotor is not gounded the capaciranoe changos and th VCO s s openting T amp aaO control unlt 3 4 RF Attenuator There ara two tlDes of attenuators according to models 1 When thg anenuator is turned ON a voltege is appli d to the relay 2 When the att nuator is turned ON the voltage to the relay is cut off Check whether the correct voltage is applied lo the relay for both vpes of ettenusrors lf the r oltage fror swhching the relay is normal the relay is defective or tha attenuator resistor has e broken wire RF UNIT X44 3130 OOt lAl41 r r ct ar r T3 6oo RF unlt tl UrUT tXrr4 tl2O Ootl lal tE s6 Ei E 3 o a TS t60 RF unlt a i i lat I u4 ol llL o JI J t ao taa Gtaa t 02 g tr rrtz o trtattr xto tt 71 5 Fllter 9witchlng The TS 450 8 83MHz filter switchin
83. sder check whether digrtal pulses are input to thB ddta line of the lC lf seyeral loope rre unlocked lf two or mora loops are unlocked find the highest level loop 1 Check whether any signal is input tro the reference trequency input pin and comparison fraquency input pin of the PLL lc 2 Check the power supply rcltages of the PLL lC low ss filter LPH and VCO 3 Check the data line of the UNLOCK lC with an oscilloscops 4 Adiust the lock voltage as instrusted in the Service Manual t rl tt tirtqt rlr b lt 60 I lf onlockcd loops rro not drlactcd wlth thc dlehel volhct t Check thcm with an oscilloscope lC UL pin VOLT DIV V Sweep time DlV smv to 0 5mV Gharqe fie SWEEP DIV in rhls range lf lhe incornect waveform shown below appears the circuit is unlocked al b bl The VCO oscillation lrequency s unsubls The lowfass filter clres not work properly The comprison frequencny level is insufficient cl The PLL is malfunctions The VCO does not work 9op rty Set VOLT DIV to 20mV or 1OmV end mske a ch ck agarn rl b The VGO oscillat ron freguency b fluctuates fhe VCO ransistor makes a loud noise The lowpass fiher uans rstor makes a loud noise The smoothing capacitor diode is defective The variable capacitor diode is defective cl The waveform is influenced by other PLL loops Check the high evd PLL loops 3 Howto Gheck the PLL Data Llncc lll 1 Apply rhe oscilloscope proba to the dsta li
84. setting the measurement point eg shown in the figure at the below 3 How To Mcasurc th Level Wlth a Sgeatrum Analyze This section dascribes how to use the spectrum ana zer fior oomparlson ft is used to check whether the level is higher or lovrrer than the correct level and gxaminE the difference of tha levels l 1 connect th6 oscilloscope probe to RF INPUT of the sp ctrum analyzer at e 10 1 ratio 2 Tvrn the spectrum analyzer ON and s t the frequency to zero 3 Set the peak of tha calibration CAL signal to a horizonul scale of the brown tube by using LOG BEF h rrey be set to any scal but it is pr fereble to set it to a high scale 4 Find the f requency ol the signal to be msasured and ser it widl the freguency clntrol 5 Apply the probe to th rrFasuring point and search br the s nal with the frequency controi knob 6 Observe the s Bnal level It it is bwer than rhe CAL signal level continue checklr lf lt ls hbher lhan ths cAL signal level reduce h to lower than rhe CAL signal lavel bV INPUT ATT CAL NG INPUT LEVEL OVER OK Anach the rnetlllic part of ths prcbe to the chassis lf the input level is higher than the CAL signal level the input amplifier of the spectrum analyzer causes distortion and signals with incorrect frequencies Bre produced The unveform of tha bas band is easier to observe if the video iher is turned ON The scan time can be set to a d sired value but should be sei to t
85. t is working normally A circuit lollowing the detection circuit is d fective The mot r does not olxr te Tho r c ivor circuit iE nor working normally See page 19 I Podblr ourar ln drq tr rftcr thr dclrction ctrgo l The ext rnal phone jack or headphona iack has a poor oont Ct A speakor wire has broken 2 Th6 AF amplifier is dcf sttve No bias is applied to rhe lc 3 Th AF Vh ls defective The connecto has a poor conlact 4 The muts circuit or squelch circuit is always r rorking 5 The modc changc circuit or AF notch circuit is defective For modols containing n AF norch circuit 6 Broken D3ttern poor soldering ot poot cpnnector contact is Dr sent in the ebov circuitg It th rrodvr clrcrrh lr OK rtcck r fallows A drult bllqrfrn tlro drtrdon nrgo b dolralvcl Example T8 4 ro lF unit SGo next p g 1 Touch Jl t SPK lThs AF VF must b set to about l0 ffi 2 T ch J4 SPO 3 Touch J2 4F2 4 Touch J2 AF3 6 Touch the 012 base 6 Touch lcl pin t Cheok lhe eibow poinrs ao lbd c polnt where e buz ctoas n6 sound For exempte lf a buzzaoundawhenSfr ia touched edd lt doas not when AF2 ls touched lhe circuit betw 8ln thaEc polnti ie dcf tive AFgly tha taatar prob le tho tcu poirra ghhln tha ghm rr rtlr lxtOOOl io dract wltcttcr t bu t 3cund ch c thc polnrr ln lhr ordor ahown bclow You crn ure rn ooillorooga to ciack whathat a nolt lr outgol l D o ll tho rcCclvcr
86. t whh a new one th t elso feihd wlun the po r r w6s turned ON l Measure the l sasEnce betu n lh outFUt pettem ol the tnrnsistor that failed and th ground lGNDl Tester ohmxl renge ls it gulnded 2 ls tte zener dbde shorted 3 Check whalher lhe trensistor fails ctue to rn abnormal locd or e defective AVR circuit Renwe the loeds lFB 28C loc 8C 5C otc l lf the tranli3tor fails g6in the AVB circuit is delective lf ft bes not ta d plug h rh oonnectcs again one rt atime Seefgq 11 4 lf the AVB circuit sc ms be ctef ctive desolder and solder the AVB boad components rgain Pult E ry soldecd leacls Exrrplc AVR ransistor leods of rhe lS 40 The cornponent legds are connectcd directty to the leod wir s Check the mini onn ctgrs for p r contact T9940 Olqt threetin c xrn ctor lf e thtee pin conn ctor is used to connect tlangisto le9ds remove tho conngctor nd solder rhe lords direotly to the pins Redrce ths AVR transistor ta NECEPT ON C NCUIT Stup SOL VR MlN RF GAIN VR MAX ANT To SG AF VR 10 00 1 Does rh9 beep sound whsn ttle rnod ls changed For models containing the rnodo announce lunct ronl YES The AF Power amplifier is OK NO The AF poarer amplilier docs not vork or i circuit tollq ring the AF rmOlifier b dcfectiw 1 No Rccrpnlon lNo Noisrl 1 Apply a lsrge inout l60dBl lrorn the SG to check thg meter The meter ope ates The rsceivgr ci cui
87. ta lines must have almost the sarne resistarrce lf the resistance of a line diff rs from the others that line is defective The address lines must have similar resistan Example A0 to Al5 A0 to A7 The resistanc s are alrrpst the sarne 1 Resisance diffors slightV J A8 to A15 ffhe res stances are almost the s m l You can find defectiw linEs in this way Then check the causo of the drflerent r sistonces D1 D2 D3 cPu AO AI A2 I Onc llnc htr a lowcr rccbilenco then tho othar Remove lC leads resistors and capacitors nnected to the line one at a tirne When the line resistencs becomes the same as that of th6 other lines the cornponent just rarnovad is defectirra I Onc llnr har a hilhcr rccbil nc th n th oth rl A panem is broken or a compongnt has a p r c0ntact I Conccp turl dnwing d thc dlgitel clrcuh The resislarrcE between DO and GND is determined by the sum of the resasGncos ol the CPU ROM RAM and l O ports The resistances b tween Dl to D7 and GND are determin d in the same way li the llne has a break ar poinl A the res lstance of the l o port is not 8dded so ths loral resistancs of the line b dilferent from st of lhe othsr lines You can find a defecliw line in th s wey 55 The data lines are mosrly pulled up wfth resistors Check the leads of the complex resistor with a tester llt is difficult to check the leads of the flar package lC I Common B is applied to pin I of the com
88. tage corectT lf not adiust it 6 ls an approprbte voltnge apliecl to ths transbtor or FETthrtg oe 6teg ALC tll HrSrartllc trF r l rSa nElhf T9E50poworcofirol _Ee _ 5 ALC Mctcr Tha ALC s e type ot fe dbeck cirq it Tho nleter poinlor indkFtos th6 te3dbacl tc a lf yor adiust the power of the 18 M finat unh to 1 XlW the ALC m ter rsading corresponds to 8 W lf pu adlust the poursr of the 12Ol linal unit to 1 0OW the ALC met r pointer rnwee less bscause rts reetling coresndsio 2OW Connect the ffi end powar rnetor Es shoryn below Setr 14 2G MHa Moder USB CAR VF MAX P A RVR MA MIC MIN 1 Adiusl the meter to zcro lnternal semi fixed wrbble tosBtor VRl 2 Adjust th mster start point Front panel MIC varlaue rrirtor VRI 3 Adiusl ths ALC zono MAX lnternal semHixed varbblo resbtor lVRl 3 ALC rngFr It Mtiar ALC AG l ffir MODE USB MICVR MIN RF rmit rBtl lr lAX SIAY SEND uct Fafi DCV M Rclr trl fiF ANT TP6 RF vnlt A rst p ioJ to vollsoe Gvlatdr o 2lAG thHalSmV STEY SEND AG AFV M hsfid F Ull Flrd tflc fthrsr o lha ALC rngt rql fflghls drh Mlr vQ 3l AS ltHrrl0nv SIBY SEND vn12 ACurt so ilrrt ALC rnrlrr llghtg to on M Y ac l r rtI f Crdon Adiust the ALC to z ro at poinr A f it is inconect the ALC rn ter doss not op rate pr rly so the ALC rnay not be adjusted ForW 6t Thr yobea bacomsa raro lha nr3l t
89. the VCo is not functioning properly the reference frequency is not input cone6ly the qJrnparison frequency input is wrong or the porer supply line is defectirre It h is kept high sith r data are incorrect or the bw pass filter or the PLL lC is delective Use this inlormation as e guide lor repak fThere are sorne exceptions 7 The checkpoints of the T 440 PLL are shown in the block diagnm T 940 T9930 snd orher models with multiple PLL loop basbaily sre checked in the same w6y G2 _ 6 DDS lDlrest Digital Syntheslzer TS 50 and subsequent models use a DDS lC as a car rler osci I htor circ uit The DDS synthssizes sine waves with digital signals and produces signals with little distortton and a high C N ratb at low cost cornpared with conventional PLL oscillators Since rhere is no PLL lockup time ftime after the frequencl chang s until the PLL loop ratums to normal status end it responds quickly it is advantageous for CW full break in and AMTOR rlar E DDS lC YM8581 bbct drgnm rnd dst lormrt f Chtd proccduro l ls e power supplyvoltage present at the power pin the lC of the DDS lC 2 ls the referenc frequenqy input to the CLK pin of the DDS lC 3 Are dao input from the CPU to the data input pins of YM6631 pins 60 to 6 F71022 pins 1 42 to 44 See PLL data line checking method I on page 61 for details of data checking 4 Replace thE DDS lC i iSilili irli i qam a tx tr tFb
90. through D5 53 Key checking procedur 2 Oscllloscope 1 Turn the set ON and observe th waveforms ol the groups of S0 to S5 linss and K0 to K5 lines 2 The waveforms ol SO to 55 lines of the S group must bc thc some when the key switch is OFF 3 The waveforms of K0 to K5 lines of the K group rnust b the sama when the key switch is OFF These are normal stat6s Examplc Whan the VOICE switch is pressed S5 data passes throuqh DG and goes to K3 The micro cornputer reads it and recognizes tho data from S5 to l s voice I I I I I Suppose that E key is electrically kept pressed Observe drs waveforms of S0 to 55 lines and K0 to K5 lin s with an oscillosoopg The waveform of one llne ot th S group differs lrom the wav forms of the otlrer lines and the waveform of one line of the K group differs lrom the waveforms o the other lines Example lf the waveform of Sl and l is abnormal the TX A switch is being kept pressed FiE l t dt ILS r rt I I rlAEI I r t t I I II tr f I I I I I I I lt a at I KEVN ANDUMT o ____ _ IAM KEY PUSI I nrl T 8 n kot mrtrk circult t4 7 How to Flnd Mioslng lThroughout holce in a borrd brolcn pattcrne cepechors or coib Gonn ctad tothc drtr finocl Analog test r xl0 or xl X ohm range Turn the set OFF Measure the resistance of the data and address lines in both forward and backwerd directions The da
91. tly 150W is output snd the ALC merer ativatBs 4 Turn the F A R VR fully clockwise and ediust the power with th6 CAR vR so rhat the ALC meter indicates the maximum zone f Chocling thr cooling lrn I lf th6 50pC swhch is tumed ON the fan starts 2 lf the 70 C swhch is tumed ON the fan noise will increase while transmitting with f ull power for about 30 rninutes lThg SDX fen starts as soon as transmasslon slarts I Powcr chcct ln cecft lrtntml Elon brnd 1 Check the pow6r at each ol the 1 EMHZ to 29MHz afitaleur bands I Turn thc AT rwltch ON pcrform tuntng end chcd lt thr pou ry nrllft thc nt nnr tun r 1 Ch ck the poryer at each of the 1 8MHz to 29MHz Irnateur bands lf there is no problem the repeir is completed lf th6 transceiver is repaargd again it must be checked horoughly to avoU repeated tepairs o 94 3 T 440 Unlock R 6OOO I lf thc T aa l HET lPlUtl ic unloclGd 1 Remove ellthe bond on the parts 2 Remove OB4 O35 and 036 from the board and liminate bond scraps from the leads as shown in the figufe at the below 3 Aftar cleanly removing the bond secure the pans with let nteh lor paratfinl 4 After the Ft meh or paraffin coob rdjust the lock vohage lf thE 51 lock rottnge is odlustcd while the jat mEh is warm th loct volfage will becom incorrect wlren the lgt m hcools FM deviat lon elso shifts Thla problem oacuns only when hot meh brownl ts filled in lt does not o ut wh
92. to ttern 5 N0 The AC line is defective Check the fuse at the AC primary side 2 Open the case and maasure the AC voltage at the primary side of the transformer with a testsr Measure the voltage between A and B whh the AC range of th tester ls the AC vdhge present YES The power swhch is 0K Go to ltem 3 N0 The wire from the AC conDector to the trans ormer hes broken The power swirch may be defective 3 Measure the rrolhge at the secon amp ry side of the AC transformer Measure the vohage between C and D and between E and F with the AC range of the tester l ls the vdtage pressnt at the AC secondary skle YES The transforrrs is 0K Go to ltem 4 N0 The wire at the secondary side of the transforrner has broken 4 Measure the output voltage of the diode bridge DC VM ls the DC voltage prosent G Hl YES The diode bridge is 0K Go to hem 5 N0 The bridge is defective lf fie bddge is shond the f use at the AC primary side blo rs when the power turns 0N 5 Measure fie output voltage at the ouput terminalof the AvR board Ercmples TS 980 T 940 28F TS 950 FHV ls the prescriborl rnttage ptessnt YES The AVR transistor is 0K Go to ltem 6 N0 The AVR transistor is delective or the lead connecting the AVR tnnsistorand the AVR board has poor contact 6 Measure output voltages such as 15V 12V 8V and 5V from the AVR board Are the correctvoltages output YES
93. tor and lC in ths PLL LPF circuit 6 Replace fic PLL lC You can tolvo thc ptla blcm Jn thlc wey wi h a ponldffr ry o gn tcr then 60 tf theVCO la modularized raprecr tdi e module I tthc plobhm riln prrslsrs do lclolloup L Apply cold spray to each PLL component during rec gtion Cool onlv one component and observe it until it goee bock to th norflrsl temp ntute Continue this proclss until lou lird a component th6t worsgns or irnprwes the sy ptqr 2 Approach a hoi sold ring iron to e8ch componsnt and p rform a check in the 8 m9 way 5 Frequency Shilt lBoth th trenrmisrion rnd rcclptlon f o quancici mu3t bc chccktd bcr bccoulr ftt ll ncc arry to drternrlno ndfielr her rhlftod tho tnn3mhsion or recrption frsqwncy l I Chcck lhr tr nrmagrlon ond rcc ption fr qurndrcfor dlrphy 1 Both lhe transmission and recspt lon lrequencies have shifted sgually in the same dir stion The PLL relerence frequency has shiftBd 2 Only the trensmission fr quoncy has shifted One of the locsl frequencies has shitted Cabulate th trcel frequencies ILO I LO 2 and LO 3t Sct displ y 14 0fl1 MHz Mode CVV lF frequenoy Firstl 73 05MH2 Secondr 8 8 MHz Third 455kHz LG1 73 05 t 14 X 87 05xxxn 59 05xruo lt LOZ 73 05 8 83 81 99xxs to3 8 srro4s6 tA On of th lwo values is oorrefi Ch ck which frequsncy has shifted by calculating the frequencies in this way lf thc velua measurcd with the lreq
94. tup l n and reset the m rcrocomputsr Hardware r set Undug lhe povrrer cable Ramwe the lithium battery Unplug thc pow r cable l p This line does not dlsclnrge soon Ground the line by using a lead Connest the power cable and reset 6 Does th microcomputer output clocks Check the microcornputer clock input wavefotm with an oscillosopa l YES The crystal oscrll tor is OK Go to ltem 7 NO lsa vohage epdied tethe lead of the crystal oscilletorT lf voltagc is opplied to the lead of the cryslal oeelllator but clocke drc not generetod the osdllator or microcf mputct may be faulty If no vothge la appliad to tha leed check whother thc vonegc B agplied lo thc power lnput plf s of the mtcrocomputer There are two ar three power lnput plnt ll no vohegc ls prcsont rt tfidsr plos rcplsce ahe microcompnter t Feplace the boerd As shown in the circuir di6gram the grouncl pin of th mic ocomput6 is not directly grounded but is grounded through a lOohm r sisto lf the resistor ig broken the ground pin is not grounded so tre micr mpuror nelfunctions Before reDlaciog rhe board check this resistor Or trn rl UOAI 1LTho Voltage Gannot be Adiuctcd Th3 AVR un contains a circuil thst generstes the refer nce vohage which can be a usted by turning a semi fixed rrariable resistor VRl The AVR circuit of the TS 940 is shown betorar Wh6n the voltage diustiflg variable resisror VRt is turn
95. u CTC CTD lnd CTS lines rrc lhortad b each lins conncct d to thc pproprhta m tcrooorngutcr pott la 5C gesant 3 Iho SOL d thc orhcr trenEc iwr not opdr Check the rone ficqrcncy md moduhlbn with lin ar dqt ctor 88 5H amp about 0 4 to 0 8k1 ts1 l t lolltts DTSS I vo ify th r fie DTss ods i8 recr 2 The Sc does not opln durine ruc ption Do 6 O6 AF slsnd enttl dr input 9in ol the DTMF dccoder lCl Doas the DTMF ttecodcroccihlor opeirtc b thc apprcprbt wltrgp apps d rc th lC 3 Chrractcn arc incolrcct fiFl z8 TH 7E1 The DTlrilF elrodcr lC b drficctire 51 u t raerilt TONETAET crrs8oil SoLorE l ra trul r m t t Tnarmbrloo t a slllt 9TAE od DTSS 00 l8 Trrnrmi lon 30Lo rir e DIGITAL C RCU T 1 Dirplay Error I FUrt chccl actollows 1 Reset 2 Turn up the AF VR and chsck whether noise occurs 3 Connect the SSG to the antonna and check whether signals are receivgd SSGOUT 14 001MHz 60dBX I I ignelr arc rocolvcd 1 The rec ption circuit and PLL circuit ar wwking 2 The microoornputer PLL data s nect 3 There is a defective pan betwaen th display darE output circuit and tho display circuir In rhe digital controll circuit I K y polnls Models with a dlsplay tubc Turn the power ON and OFF sevsral timgs lf any segment of the displav tube lighrs the display tube and DC DC converter are functioning There is I dafective pa
96. uency ct untet eguals tha calculated vatue wlthin t2kHz it is OK lTha local tregucncics shifr tn some modes tSto 5 kHz shift Suspastad Check it xO kHt or more Chcck the PLL circutt See the PLL circuit section l olo The old rnodels use cry al oscill tors Reacliust aach frequency as instructed in rhe Service Manual etO0lt rlo0fr Each oscillator hag a elight error as ghown abo e but if ii is edded to or doublcd th frequency shift may b co no s nif rcant I Th trtunlrlboficqocncy dtlftr ln Fill modronly TS 0 TrSi 80 TS 7 t 1 T 81 I T 790 otc l The old models us cry3lal qscillators in HETs for freguency moduhr on in FM mode 1 Veriry that the transmission frequency does not shift in C1 v mode 2 Verify that rh r ansmission frequency shilts in FM mode onty 3 Find tho varicap diode lor fieguency moduhton llt probauy ts locatcd in tlre lF unit t 4 Adiust the freqvency of th crystal oscillator cpnnected to rhe diod f X ffro nnqrnGy b oorilct ln hll modc only The FM lrequenc y nray have been adjustsd while the Orr basicl lreguerrca hes shifted Acljust the CW fr guency then the FM frequency I qrb roorprum ftr4nnory bs ift d h ff modt ln SSB i the fr qu nqlos sre cor ct only the reception froquency nwcr shifts f Varfy drrt rr trnrnrhrlon lroguoncy b comct Check rhe PLL reference frequency Check whether each mix lrequency is oorr ct Thls sho rs that lhe trensmh frequenc
97. ulput I Replaca detectivo parts x4 1400 00 02 03 MRF485 R9 RIO 22 ohms lW D5 BZ 192 or RD20F B2I 2 He solder the solderd and component sides of the bo6rd lDo so deliberately because the Ol or 6 pattgrn may have poor conmct at through holes 3 Chack ffi 07 and D1 with a test r 4 Take special carg not to darnage insulating spoc rs wfien insralling 01 O2 Q3 and O7 5 After installing all the screws check the colloctor and grouod of the 01 02 03 and 07 transistors with a tester lf it is shofted the insulating spacer is damaged and the scra and the collector are shorted 6 Desolder L7 place an ammstar between the 07 collector and L7 lead and set as blbws 14 200MH2 Mode USB MlC CAR VB MlN Transmission Set tre bias current to 50mA with VR and l ave itfor 8n hour Check how rnuch the current increases Observe how the amrnetsr pointer noves Normally the pointer moves slowly lf it moves qubkly at intorvals of one or two secands lCr may be defEctive Check th wewform at the Es of and 05 lf the wayetorm shown at the below appears replace the lC MCl723Ctl I Powrr suppty circlit ITS SIO onlyl 1 Measure the voltage at CNl pin 18 with I digirel voltmeter lf it is l8V or fewer replace ICB in the s nal unit li the rolage applied to this lC flucruates largely the final unit lUA7818UC fails I Thcrmally Gonn ct D2 rnd THl ln th llntl unlt ll D2 is this type ot diode the bies current
98. ve if th LED ligrhts dynamically Check it with an oscilloscope Notas for checklng fhe LED There are two methods ol lighting the LED Turn rhe LED ON and OFF bycontrolling the anode voltage No rroltage is applied to either end of the LED when it is OFF p vcc do tl It Turn the LED ON and OFF by grounding the cathode Vcc is spplied to both ends of the LED when ir is oFF a The Dhplay b Dark I f rhc dlcpbv rubc 1r uscd ls the dinrrer circuit kept ON ls the heater voltagg lo r7 Tha dlsday tube may be defective lf the vacuum is low the display darksns lf the power suppty rroltagE of the DC DC nverter is low the displsy darkens lf lhe rutput vottage of the DC DC converter is low the dBplay elso da rkens I lf rn LCD lr uccd Tha back light is dark The DCOC convener is detective The fluorescent larnp of tho backlight is defectiw The porerguppVvologeis lor 8C 5C An abnormal rottaga is applied to the LCD dtive lC The drive lC is defectivE ls the dimmercircuit kept ON I ll an LED b uc d An abnormal vottagp is applied to the drive lC Thc drivo lC b defeoive The dlode is clefective Brightness is uneven l The po r rsupdyrcltage is low For any dirylav type chedc as follows 1 Check the powcr supply K 5C hcater AC linel 2 Checktl trsplay unitvoltage 3 Checkthe dhar circuit opdrationg 52 5 Mcanlnglccr Dbphy or Display Error Check whether tha transceiver can receive signals
99. when fte rerminel 50 ohmo This voltage is convertad to rhe SWR meter indicetbn Yo r cen locetc I delective pan by checking the VSF volt ge lf th6 t00 model The TS 950 outputs mtpacdnrarot 75 ta lo T9850 I VSRvoltrgor urtmmt l when the antenna re minal is tenninSt d with 50 ohrns pourer ol about 25W rs output 2 AppV thc DC VM prob to th VSR termin l end s6t the voluge to MIN by TCl I Crudoo Some rnanuals specw that the output po ver should be 1O but 25W shqlld be outpr rt to pr cisely adiust the ol0ag to MlN Do not put any changor betrreen rhe ntenna gnd dummy when adjusring rhe SWR NULL Otherwisa the minlmum i ottBg point shitrs 8 RF MGtor and Power Mctcr The RF mstEr d t cta thg trensmifter wath a diodc converts h o a OC voltage change amplifies it with n ope6donsl amplifler and operetee the mster Some recent rnodgls share thaVSF spnals I Th m Or polot r do6 not movc l1i9tE0 or rbr t nt moddrl 1 Receive about a 4clB signal from lhe SSG and verily that the mgler porntor rnoves 2 Enter the transmit mode and ch ck lhe VSF voltego Do6E the VSF voltage rise when the power incr asgs slo rvly 3 Check the voltage of the nriable rcsistor VR used to sdjust th po r r msiEr 4 Ch ck the voltag st lha power rneter inBrt port of th mft cornputef The m rcrrcornputer port do s not scc pt signals il tfie innrf wtuge excseds 5V lf it ls higherr
100. y is correct but the rrceive frequenq has shifted 26 a Chd how mudt ft r c ln fia roooy hrr dftrd SSG trequcnc y 29 SO0OMHz SSG MOD frequcncy lkHz DEV 3kHz MOD ON Set freguency 29 5 FOMHz 1 Shifi tho SSG frequency in lO0Hz units and find the best SINAD point 1l it is within l kllu il rarles within the oomponents It can be impro red to sorn degree bV foadiusting ths lF 2 ll it cannor b edjusred to witlrin tlkHz Check eacn LO fr uencl shift during rsception Ref r to the transmbsion section l It each rrrsssured fiequeney equals the theoretical frequenc y t2kHz th ro is no problem lf h is greater pedorm troubleshoofing as descrabed in the transmission section 3 Each lrequency is conect A comnrn caus is a pass band shift of rhe MCF fiher Becausc tlre central lrqu nc1 of the MGF filter has shifted il seems to re an lF shift in FM mode 73 05MHr t SlIUlHz 4 f an lc 13 us d tor FM clet ction Redace tho compgnents ln the orcler listect below tc 455 lF fftcr r Dircreto coil lC oscillator hs frequency may shilt by t2kHz bur ir is permisslble lF MCF fihar 5 A sensitMty check i mey be useful Example 14 100MH2 MOD FM SSG frequency 14 1OOMHz MOD frequenoy 1 kHz DEV 3kHz ln this case do as follorw Apply the i tg to pctint A ard entar the lF frequency l455kHz OdBFl Apph the io to point B ard ent r the lF frequency l465kHz 60ttsd AppV the j rg to p

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