Service Manual for KKR606 Rhapsody 2000 FM and KR608 Table Radio FOOTSCRAY, SIDCUP, KENT 01-300 7733 32 Milton Road, East Kilbride, Glasgow East Kilbride 25101Service Manual for KR606 & KR608 Dimensions: Height: Width: Depth: Weight: Power Supply: Power Consumption : Battery Life: Power Output Wavebands: Loudspeaker: Transistor Complement: Diode Complement: Controls: ISSUED MARCH 1969 KR606 KR608 190mm (74") 160mm (6¥%") 345mm (13$") 380mm (14 }") 98mm (33") 220mm (84) 3.2kg (7Ib 1 ozinc. batts.) 3.6 kg (7Ib 14402) 18 volts—2 off 9 volt battery Mains 240v 50Hz PP9orVT9 Quiescent 21mA 5 watts 50mW 46mA 500 mW 105 mA 1.5W 170 mA 270 hours at an average listening level. 2 watts for less than 10% distortion V.H.F./F.M. 87-102 MHz Bandspread 1150-1500 kHz, 200-260 metres Medium Wave 540-1620 kHz, 185-556 metres LongWave 150-250 kHz, 1200-2000 metres 8" x5" 150.10,000 Gauss BF 184—R.F. amplifier. BE 184 — Mixer oscillator (f.m.) BF 184 — Mixer oscillator (a.m.) 1sti.f. amplifier f.m. BF 184 —|.F. amplifier (a.m. and f.m.) BF 184 —L.F. amplifier (a.m. and £.m.) U17220—Pre-amplifier U17221 — Impedance matching emitter follower U17222 — Driver 017223, } Complementary symmetry U17224 § push-pull output pair. CG64H — F.M. tuner a.g.c. CG64H — A.M. detector CG63H —|-F. overload protection BZY87— Stabilizing diode SGEIH | Ratio detector Volume — On/Off Tuning Push Buttons: L.W., M.W., B/S, F.M., Tone. Page1CIRCUIT DESCRIPTION FM. The telescopic aerial is transformer coupled to the emitter of TXtl which is an rf. amplifier operating in the common base mode. The collector of this transistor is connected to Lt3, the f.m. r.f. coil which is tuned with the gang section Cv2. The signal is then fed to the common base mixer oscillator. The oscillator works lower than the signal frequency. The tapped oscillator coil Lt5 is tuned with Cv3 and is connected to the collector of TXt2, which is coupled to a double tuned i.f. trans former, the primary Lt6 being capacity coupled to the secondary Lt7. The signal is then applied, via a capacitance tap, to TXml, the collector circuit of which is connected to the 2nd fm. if. transformer primary Lmi, which in turn is link coupled, via Lm2 and LK1, to the secondary Lk2. This secondary feeds the signal to the base of TXk1, the collector of which is connected to Lk7, the primary of the capacity coupled, double tuned, 3rd f.m. i,f. transformer. The secondary Lk8 is connected to the base of TXk2 and the collector of this transistor feeds the signal to. the balanced ratio detector. The audio output of the detector is applied, after de-emphasis to the volume control. An a.g.c. signal is obtained by using diode Dm!1 to rectify the signal fed via Cm7 from the 2nd f.m. if. transformer, and is applied to the rf. transistor TXt1. Ls nw Bis ] ] I Les Le wou Kok 7 }Cemi Jcma “Tvl Tm cv Tm Cm4 | ET. (—_4j—_- i It ROD AERIAL cincUITs LM Mx as emis cms emis mi cme cmo { -4 aA mack, cm Al L ree; a eno rang sev x m2 = AM. OSCILLATOR CIRCUITS A.M. The signals from the m.w. and l.w. coils on the ferrite rod are fed to switches, and the selected signal is applied to the base of TXm1, the a.m. mixer oscillator transistor. From the collector of TXm1 the signal passes through the secondary of the oscillator coil Lm4 to the capacity coupled a.m. if. transformer Lk3 and Lk4 and on to the base of TXk1. This transistor feeds the signal to the double tuned if. trans- Page 2former primary Lk5 and Lk6 which is inductively coupled to the secondary Lk9 and LK10, The signal is then fed to TXk2 and from there to the final single tuned if. transformer Lk11 and Lk12. The output from this transformer is detected by diode Dk3 and the audio signal produced is then fed to the top of the volume control via RK12and Rk14. de Dk1 controls the amount of signal fed to TXk1 and thus prevents TXk2 being overloaded, and diode Dk2 stabilizes the biasing of TXk1. For a.g.c. a negative voltage increasing with signal is taken from the junction of Dk3 and Ck21 and fed via Dk2 to voltage contro! TXk2 through the potential divider Rk6 and Rk7, and current control TXK1 through Rk2. AUDIO Capacitor Cm17 and a push button on RMM31 are wired across the volume control to provide switched treble cut, and on KRGO8 a screened lead connects the tape socket to allow tape recordings to be made. From the volume control the signal is fed to the base of TXa1, the audio pre- amplifier, which is directly coupled to the base of TXa2. This functions as an im- pedance matching emitter follower. TXa3 drives the complementary symmetry out- put pair TXa4 and TXa5. Ra6 and Ra7 form a potential divider to apply negative feedback to TXat Capacitor CaS provides frequency selective feedback to TXa2. KR608 CHASSIS REMOVAL INSTRUCTIONS Place the cabinet on its back with the sloping front facing toward you. Remove the three screws which are behind what is now the top of the cabinet. Lift the control panel vertically out from the cabinet and !ay it face down in front of the cabinet. To replace the chassis reverse the procedure, ALIGNMENT INSTRUCTIONS The two receivers contain the following modules: RMT11 (KR 606), RMT12 (KR 608), RMM31, RMK20 and RMAAO, To align the receiver the following equipment will be needed: 1. A.M. Signal Generator covering the range 150 kHz to 1620 kHz, modulated 1 kHz 30%, 2. F.M. Signal Generator covering 10.7 MHz and 87 MHz to 104 MHz, modulated 1 kHz +25 kHz deviation. 3. Output power meter 1522 4. Shielded test coil (85 turns of enamel covered wire on 2” diameter former). 5. Oscilloscope. Page 3LF, ALIGNMENT A.A.M. (470kHz) CIRCUITS 1, Set a generator to 470 kHz and connect it to the receiver via the Car Aerial Socket, or alternatively to the base of TXm1 (pin D2 on F.M. push button switch). 2. Switch the receiver to ‘MW’, set the gang to minimum capacity and turn the volume control to maximum volume. 3. If background noise renders alignment difficult remove the signal input and pro- ceed as follows :— a. Note noise power on output meter at maximum volume. b. Turn volume control down 20 dB (100X). c. Use 50 mW as reference level instead of 500 mW. 4. Trim for maximum output by adjusting the coils in the following order on the RMK.20 (i,f.) module -—Lk11/12, Lk9/10, Lk5/6, Lk4, Lk3 and then readjust if required. Maintain the output at approximately 500 mW by adjusting the signal generator output level B. F.M. 10.7 MHz) CIRCUITS 1. Set a signal generator to 10.7 MHz and connect it to the test point on the tuner edge connector (pin 6) via a 3,000 pF capacitor. (The earth lead may be con- nected to the body of the gang condenser or the screened lead braiding on the if- output lead) 2. Switch the receiver to f.m., set the gang condenser to maximum capacity, and, turn the colume control to maximum. 3. Set the slider of Rk15 (Detector Balance’) to the mid position 4. Trim for maximum output by adjusting the coils in the following order on the if. switch and tuner modules :—Lk13/14, Lk8, Lk7, Lk1/2 and Lm1/2 (on switch module). Lt6 and Lt7 (on tuner). 6. Set the signal generator to a.m, modulated by 30% and adjust Lk15/16 for minimum output 6, Increase signal by 20dB and adjust the slider of RK15 for minimum output. 7. Repeat 4, 5 and 6 above. Check that peak audio output at fm. coincides with minimum on a.m, R.F. CIRCUIT ALIGNMENT AM. Connect a signal generator to a test coil. The test coil should be positioned so that it is coaxially in line with, and its centre is 54” from, the m.w. end of the fe rod. The following operations should be carried out in the order indicated, being repeated until maximum sensitivity is obtained : Page 4Input Wave- Gang Operation Frequency band Position Adjustment 1 540 kHz Mw. Fully Closed Lm3/4, Set pointer to datum, 2 1620kHz MW. Fully Open Trimmer Tm2. 3 REPEAT OPERATIONS until the band ends are satisfactory. 4 600kHz MW. Tune for Tune m.w. aerial max. signal coil, L1, on ferrite rod. 5 1450kHz B/S Tune for Trimmer Tm1. max. signal 6 REPEAT OPERATIONS 4 AND 5 until maximum sensitivity has been obtained. 7 225 kHz Lw. Tune for Tune L2 formax. max. signal sensitivity. FM. 1, Set a signal generator to 87 MHz fm. and connect the signal output to the car aerial socket or external f.m. aerial socket. On the KR606, collapse the telescopic aerial 2. Switch the receiver to f.m. and, close the gang condenser. 3. Adjust oscillator coil LtS for maximum output, keeping output at or below 500 mW by adjusting the signal generator. 4, Adjust rf. coil Lt3 for maximum output. COIL AND TRANSFORMER DATA Circuit Reference Description Resistance u MW. Aerial Coil 189 12 LW. Aerial Coil 789 Lm3 (Pins 2&4) A.M. Oscillator Coil 229 Lk3. 4St A.M. Primary 402 Lkd (Pins 1 &3) 1st A.M. Secondary 449 LK5 (Pins 3 & 4) 2nd A.M. Primary (Part) 189 Lk6 (Pins 6 & 1) 2nd A.M. Primary (Part) 289 Lk10 (Pins 1 &3) 2nd A.M. Secondary 5.02 Lk11 (Pins 1&3) 3rd A.M. Primary 5.92 ALL OTHERS ARE LESS THAN 1 9 Page 5KR606 DRIVE CORD ASSEMBLY 1. Remove the two Philips screws from underneath the top chassis plate, position W. Pull off the two large knobs and remove the Perspex scale fascia. Turn the tuner drive fully anticlockwise. Make up the cord as shown in fig. 1. Thread the cord through the tube formed in the tuner Wind the core onto the drum asin fig. 3. Fitthe drum onto the tuner spindle. Pass the cord around the pulleys as in figs. 4 & 5. Tie the loose end of the cord onto the loop and fit the tension spring as in fig. 5. Attach the pointer and align it with the reference marks on the scale, NER pave drum, See fig. 2. S Senomaon CORD TENSON Saixd RS eeTUNING VOLUME - ON/OFF ey uw aentan L i MM BS) EM, TONE 29 | L] RMT II a MM 31 a [Awe |O © CAR. YT = SOCKET islis a BATTERY BATTERY SPEAKER sq = L RMA _40 i RMK 20. CT RECEIVER LAYOUT KR606 UxS/6—LKG/IO Lk? Uke aie ka LJ ux ee RMK 20 Lean LKIsf6 ( Rds EARPIECE SOCKET,RECEIVER LAYOUT KR608 END VIEW OF RMT 12 EiKR608 DRIVE CORD ASSEMBLY ‘Turn the tuner spindle fully clockwise. Place the cord loop on the tuner spindle. Fit the tuner drive drum onto the tuner spindle and secure with a knob clip. Thread the cord through the slot in the drum flange. Wind 4 turns onto the drum by holding the cord and turning the drum anti- clockwise. Continue to thread the cord as shown in the diagrams, on Page 8, winding 3+ ‘turns anticlockwise around the rubber bush on the drive drum. When you again reach the tuner drive drum wind 1 4 turns clockwise around it and thread the cord through the slot in the outer flange. Slide a short piece of plastic sleeving over the cord and fit the large knob clip to clamp the sleeved cord. Attach the pointer and align it with the reference mark on the scale. 9 PN ® TAONS F.M. Tuner Printed Circuit Board Schematic for RMT11 & RMT12A.M. R.F. Printed Circuit Board Schematic RMM31ted are ‘oper side of the board. Components shown dott ‘on the c 34/197/3 IF. Printed Circuit Board Schematic RMK 20sae --4 RMA 40 ts [17 [19 |19 feo]2r Jee |23 24) 13 [14 [is 12 RMM 31 9 fiofi RMK20 t]2]3]4[5]6 RMT IL INTERCONNECTING WIRING DIAGRAM KR606MMT seoun FEE: RMT 12 RMK 20 NTERCONNECTING WI RING DIAGRAM KR608SPARE PARTS LIST DESCRIPTION KR606 R608 Cabinet sub-assembly 1538/3/21054 1565/3/21428 Handle 28/321/14030 — Handle end cap (2 off) 28/330/14031 = Handle moulded spacer (2 off) 40/278/20426 - Foot 28/12/0/21063 = Badge holder 35/534/13155 - Badge 21/189/13073 — Fascia grille 28/311/1/13153, 28/340/13207 Scale 44/93/1107 1/98/1107 Scale clamp 33/673/1/20392 - Scale trim (2 off) 28/322/13012 = Control panel top trim - 28/346/13266 Control panel bottom trim = 28/339/13248 Knob (off) 1538/60/01096 1565/60/01234 Car aerial socket 13/79/2/25200 _ Car socket clip 4/310/20821 = Earpiece socket 13/435/1/25364 = Earpiece socket clip 4/311/20820 — Tape socket, 5 way D.I.N. = 13/536/25126 Aerial socket, standard co-axial - 13/525/25073 Loudspeaker socket, switched D.ILN. = 13/537/25128 Telescopic aeri 13/470/06240 — RMA40 support bracket 33/691 /20321 - Rod aorial bracket 35/441 /15006 Bulb holder = 13/137/23043 Bulb 6V = 13/510/V/12094 Drivedrum = 1565/18/18013 Tuner drive drum 42/31/18108 1565/15/18022 Guide pulley = 1565/11/20431 ‘Small pulley (2 off) = 42/28/1814 ‘Small pulley shaft (2 off) = 36/402/20371 Tuner mounting bracket = 1565/12/20302 omponents mounting plate = 33/695/20559 5 transformer = 39/S1/73/04084 2,5001F 30Velectrolytic C1 = KEM241/S/08263 Bridge rectifier H131PEO1B = 14/32/12299 Fuse 200mA Q/A = 13/57/5/23089 SPARE PARTS LIST, COMMON ITEMS DESCRIPTION Circuit Ref, Part Loc./No. Gangedcapacitor(RMT11/RMT12)—Cvl-4 38/127/1/18080 Ferrite rod - 43/61 /06745 MW. aerial coil u 32/233/06022 L.W. aerial coi 2 32/234/06023 10k@ Log. pot. with switch. Volume RZ 9/371/1/02127 Loudspeaker, 8x5", 150. 11/197/03024 Edge connector for RMM31-9 way (2 off) Edge connector for RMM31-6 way Edge connector for RMK20-9 way Edge connector for RMA40-9 way Edge connector contacts 13/426/1/25123, 13/432/2/25264 13/426/25189 13/426/25189 13/427/20497 F.M. TUNER MODULE RMT11 (KR606) F.M. TUNER MODULE RMT12(KR608) Aerial coil f.m. tuner R.F. coil f.m. tuner LF. reject coil Ose. coil f.m. tuner Ist f.m.i.f. transformer primary 1st f.m. Lf. transformer secondary Le, Lt2 43 Lea Ls Lt6 7 Page 15 1864/1/16105 1588/1/16201 32/270/06040 32/348/06005 32/287 /06042 32/272/06043 32/347/05063 32/274/05032SPARE PARTS LIST DESCRIPTION Circuit Ref. Part Loc./No. Capacitors 1.5 pF cus Ke313/c/08479 5 pF C8, C19 KC306/C/08460 20pF cuz KC305/C/08504 22pF cu KC303/C/08248 25 pF cua KC304/C/o8a62 27 pF en KC326/08063, 47 pF cu KC302/F/08522 ‘SWITCH MODULE RMM31 1553/1/16162 Push button knob, Round, Silver 35/536/01092 P.B. Switch Assembly 13/469/10052 A.M, Oscillator Coil Lm3, Lind 32/281/05015 2nd F.M. |.F. Transformer Primary Lt 32/275/05030 Trimmer 5-50 pF, (2off) Tmt, Tm2 38/110/18014 Electrolytic 10uF 16v cmio KEM164/S/08509 Electrolytic 12511F 10v cmt KEM258/6/08491 Capacitor 12pF — 1 pF 30v Cmd,Cm16 KST436/08016 Capacitor 69 pF — 1% 30v m3, Cm14 KST438/08019 Capacitor 125 pF = 1% 125v mt KST409/08586 Capacitor 500 pF — 1% 30v Cmi3 KST440/08020 Capacitor 0.022 uF = 80%—20% 30v Gm9 KC295¢/08465 Capacitor 0.022 UF — 10% 160v Gmi7 KT117/08402 Capacitor 0.047F = 50%—25%12v mS, Cm1S KC283F/08396 Capacitor 0.2 HF + 60% —20% 10v cms KC309/08471 LF. MODULE RMK20 1350/1/16051 Ist A.M. Primary La 32/282/05043 1st A.M. Secondary Lika 32/283/05048 2nd A.M. Primary KS, Lk6 32/284/05046 2nd A.M. Secondary Lk9, Lk10 32/285/05047 3rd A.M. LF. Transformer Uk1, LIZ 32/286/05049 2nd F.M. Secondary uke 32/276/05036 3rd F.M. Primary Lk7 32/277/05037 3rd F.M. Secondary UKs 32/278/05038 Ratio Detector Primary UK13, Let 32/279/05041 Ratio Detector Secondary kt, LAG 32/280/05042 Electrolytic 2\1F 10v cK27 KEM186/S/G/08544 Electrolytic 25 WF 3v cKs KEM245/S/G/08390 Capacitor 118 pF = 1% 125v ckt KST408/08582 10r 0.2 UF + 80% —20% 10v Ck10 K¢309/08471 or 2 pF +4 pF 750v Kis KC117/08553, ‘or 4pF « t pF 750v ks KC308/08532 ‘or 330 pF =: 20% 500v cK20 K¢21/F/08198 101 1000 pF + 40% —20% 500v Ck23, Ck24 KC195/F/08537 jor 0.01 LF + 20% 500v C21; Ck25 KC156/08708 10r 0.0022 UF + 20% 500v cK26 KC257/08456 Capacitor 0.047 UF + 80% —20% 30vCkB, Ck7, Ck9, Ck16 cKt7 Kc296/086505 Pre-Set Potentiometer 4.7K 0 RKI5 9/212/02071 AUDIO MODULE RMAAO 1548/1/16163 560pF 10% — 500vcapacitor Ca5.ca7 —_KC307/08032 1000 pF 20% 500v capacitor cas kc18/08249 0.22\F 410% 250vcapacitor Caz KT151/D/08307 150 UF ‘18velectrolytic capacitor Cat,Ca3_—=—« KEM257/5/08333 160 HF 1Ovelectrolyticcapacitor Ca6 KEM162/S/08638 250F 2Ovelectrolytic capacitor Ca KEM254/S/08337 350)F 12velectrolyticcapacitor Ca4,Cal0_- KEM253/S/08350 Heat sink clip (2 off) 4/324/20061 Page 16| — i - |SCREEN (wor USED) TRANSISTOR BASE CONNECTIONS 0 H Z Es] :83] Bs] Be Bg el BS BS 8 oa. 3 ma [Ss ie coe oe 2/o | see re 1S ole ode axle . HE" SHOWN IN. TONE & EM, POSITIONS COIL_FORMER BASE CONNECTIONS ALL VouAGes ane NecaTve 2NO_8 WITH RESPECT To THE POSITIVE CHASSIS RAIL. iS_he Loe eo I toy 7 fy viioe Bs & sean on -—+-G— Tka3_ TXa4. t 7222. ur7223 T L T Txal TXa2_-TXa5 BFI84 ui7220—UI7221._-UI7224 KR606 CIRCUIT DIAGRAMWTERUAL EX. AERIAL EXTERNAL EM. EMAL SOCKET TXtl BFI84c Gp SCREEN (NOT USEO! c . Sow uw ‘Tkal Tka2 Txa3 Df Txt TOME [EM Thee Teas The kT a rae i] f HL, TRANSISTOR BASE CONNECTIONS. eel leo] oo, Joo) a 33] Ba is 8 xe 3/68) Bel 88) [ee igs} BA 83 BE 2[o-o]4 2[o-9) rw2[0o]sranrs Bs] er ce ox 3\o eel ° lone ee ‘lo ole lo ofe sunt ilo_olrms asa cee FM OSC, FM AE SWITCHES SHOWN IN TONE & FM. POSITIONS. COIL_FORMER BASE CONNECTIONS i Meh AT ALL nesicrons ong Yaw SOF SLRESEECT so THE ALL CAPACITORS 10%o s # cmd MAY BE O-QUIF IN SOME MODELS, vA vewwow TELTOW tt yess, ‘Tet a[— ¢—e-—»—0_0 o_o. 3 ‘TXa3 TXad d ul7222.uI7223 $e" (—+—0—0 00 0 0 —0 0G) 00 0 0 0 oe Se RMK 20 RMA 4O — o—+ o_o o—e ee TXk2 TXal Tka2 TXa5 KR6O8 CIRCUIT DIAGRAM