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MAINTENANCE SERVICE MANUAL FTC-4610/4625

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1. NIVIN OI 214 1 SLYVd NAS ee lh NE EN tar e WON ge 0 7 OR in al 3 qur fepe ey 245555 2 onum o 109 092 eda c gt 3 em dup db aub oe c ap c oe E m 9 x 2 gt 0 L 4666 Bee gt 2 pene 4 3 DEL ENS Novia Km ul D Mu aS en ve 29 913 SLHVd DNI SERVICING VR UNIT PARTS LAYOUT For Service Manuals Contact Viewed from Component Side MAURITRON TECHNICAL SERVICES Viewed from Solder Side 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk LED UNIT PARTS LAYOUT Anode Cathode R Red segment G Green segment Viewed from Component Side Viewed from Solder Side GL 52RG TLO 114 Anode Red segment Cothode C L Cathode Common Eg Anode Anode Green segment LED Connections SERVICING tosa 25 2 BOOSTER UNIT PARTS LAYOUT i
2. i VOLATGE RF mV RMS 500 9 22 70 23 m 24 7 1 I 16 0 25 amp 0 26 540 21 Q 218 38MHz 76 152 456 MHz MHz MHz SERVICING VOLTAGE CHART DC VOLTS 4 E m SKN Paw ee a espere o an few er far De p pee Qu sana sana faves 203 gt e o ea er 875 o ate ver o mm 1 fren ove jaso Peper fae twa SEPP PEEP o Tu an em 218888 1 z APC OPEN 25W 5 81 y 0 8 Y 0 8 0 7 16 1 6 ar rns ss v AF Pad Measured with VTVM 4610 FTC 4625 For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk 1 SERVICING CIRCUIT DEVICE INFORMATION Input final RF device M57704H UH SH Pin DC volts DC current 0 2 13 0 0 98A 3 13 0 0 98A 4 13 8 1 56A 5 0 Nominal Value Spurio
3. 4 E WENN 24 om s gt 27 5 f i 1 t i 2 lt I 4 4 E 8 E 5 t P d 1 i M 4 M 1 o v am ap UP Viewed from Component Side SA FED E Re ocean ODE uri Catia em A gt lt gt gt 7 s ot 4 Su e m um el 105 SA lu 75 5 8152 lo c 0521 9065 1 Viewed from Solder Side I SERVICING BOOSTER UNIT MOUNTING DETAIL 844 y 1 x MAURITRON TECHNICAL SERVICES RELAY CONNECTIONS 8 Cherry Tree Rd Chinnor Oxon OX9 4QY 501 Tel 01844 351694 01844 352554 Email enquiries mauritron co uk For Service Manuals Contact SERVICING TONE SQUELCH UNIT PARTS LAYOUT For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk Viewed from Component Side
4. BRP 2605 23 2 270667 6 24575 T 55 t 0204 220 9202 0204 4205 0206 9207 0208 9229 050 TOYO TOS BUFF MOD UFF CULE 0008 TRIP IST AMP AMP PWR AMP PWR AMP PF FC52M 250535 25 535 201 250535 255 306 25 906 2561907 2501907 255 2407 57704 2502695 fo 9205 071 i w 221 R 2215 6 0202 0 05 Ja 0218 9214 3 2212 8 0212 0 050 A wi AMP LE LPF vB AMP OC DIFF AMP REL Ba 252458 250458 161555 25567 250458 MLM2902 25535 1559 37 MM 42 FEMM 450 0 i 455 KHz 1 214 912 000 MHZ I 1 I 1 2142 om 210 9 08 906 02 PWRAMP JISC LIM AMP 455 EIL 2NO F AMP 455 FIL ANO MX IST IF AMP FIL IST MIX RF AMP AN 31 4550 uPC577H UB i5 25C4 60 2 LFB8 5 250535 250535 2 1 2 35 76 35x76 ANG LOCAL 055 250 535 0103 0 04 093 REC NOISE PF 16555 a2 9 03 0 04 010 ST LOCAL TRIP TRIP FCSAM USC 2501906 266 1607 301 47 622 42 867 54 51 163535 29C460 12 4 9n MORE 428600MHz 4906 00 0404 sre MB3756 47622MH1 4 51 Mz 3 B Z N 8 2 VIRX PTT 8 2 v1TX FTC 4625 BLOCK DIAGRAM 37 500 250 0
5. 3 4 15 445 22K Ss EU 268 70 us n Nien 3 N 2 5 0 6 0217 9218 9 25 4588 2504588 2 5868 F8 2118 ETT 2564588 o gt 5 525 EN lt 8 2 7X gt G Z C30 R302 47K 23291 7 78 85 umb eee eS For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon 9 4QY 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk 8540 402 0402 5597 08 0109 9 F101 2 0 358 ers 2564666 2564608 cro ws PC S77 7H ES P 0 PB 2148 1 2 E 240 fn 5815 455 D 3 np our 000 I2 4 E VRI p g lt 5 fe our 1 x 7 PLE a FEE E E2i lt lt Palo EET E 5 3 i 33 8 2131 3 7 147 d Bornm 22K 5 4 16 3 5 nm F I cim T x A 2 047 0 04 3 j M 0113 0114 0115 0116 0117 2564606 25C4608 25 4608 2SC4608 2SC4608 RISE 220K A457 4 8 wam a amo s m EO bur K 40 82 Q206 Q 207 Q208 2551907 C237 76203 25 1907 25 2407 2 5 RESET 43 8V 53 AO 1
6. c 3 1 o gt lt gt K02179004 2 Lam 0 o lt E K02172040 mm CH 4pF K02172040 CH 4pF DD104CH040C50V02 DD104CH040C50V02 cha K02172040 CH 4pF K02172040 CH 4pF K02172040 CH 4pF DD104CH040C50V02 DD104CH040C50V02 DD104CH040C50V02 mm K02179052 CH 5pF 2179052 CH SpF K02179055 3pF 2222 636 09508 2222 636 09508 2222 636 09308 pie K02179052 CH SpF K02179052 CH SpF K02179053 CH 4pF 2222 636 09508 2222 636 09508 2222 636 09408 CV101 HRW 231MT 1019A HRW 231MT 1028A Esos E SNA rm e il E 1 7 SNE all E DRM 228 onis NUI Li DANN 2 OMNE FTC 4610 FTC 4625 TECHNICAL NOTES MEMO For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk SERVICING OUTER COVER REMOVAL 2 gu D For Service Manuals Contact MAURITRON TECHNICAL SERVICES lt 8 Cherry Tree Rd Chinnor Oxon OX9 4QY a 3 E Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk 3 FRONT PANEL REMOVAL SE
7. 2SDIIAY P2 S _ DI a p 9 9 S25VBIO e 2 4 E 5 514 E Y 0 ud Sib TECHNICAL NOTES AC POWER SUPPLY FP 5 CE ads TERRIER Ql CN BODO es zz us 205 t 20 518245 i3 8V Yio N I G 5 9 815 Y 5 516 4 ERE 012 DI 8 x o o 2 uj 0 gt m N x C IST 7089 PB 2025 __ SPI For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 enquiries mauritron co uk TONE SQUELCH UNIT FTS 2 Q711 VR748 Q761 Q7 5 Q743 TECHNICAL NOTES 955 rg 318vl HOLSIS3H ONINNL 335 9 5 51 YOLINOW 553 1 06 S 3 0 ZF 9 LT 4 318 55 SAONVH Q310N 3SIMY3SHLO SS31Nn 91 47 NI SHOLIDWdY2 11v Q310N 3SIMH3H LO SS31Nn 9683 SINHO NI SHOLSIS3H 11V C06CW1W ONY 8 09353 3HV 01 ONY SHOLSISNVHL 11V SALON o 282 NO LEY Eg X6 287 Wvuovid LINDYID 0 699 43 4 047 04 LOY M xX 3 w 28 17010 01 Y gt m gt G
8. 203 4155 4 J gt 3 56555 33K 4 7K T Se amp gt 9 joe quer 2 4 9 3 3 amp 9201 9202 0203 9204 9205 9206 Q 207 9208 25 5358 2SC535B R213 25 5358 25 1906 25 1906 25 1907 6237 72203 25 1907 2562407 C 266 0 00 220 2 0 22P CZA 5P 230 10 5 0 5 2 7 2 C207 1 CH gt 8 AK 58 Q 7202 oS 3 9 5 2 100K S 54 2 8 lt Sas 3 e lt J TS 5 Nr 445 lt 2 5 5 3 as 258 M 5 lt S St S S N 72205 TP206 H MEE IK 1 Sao FEN 4256 122 lt xpczse t1 5 Sgn S SS 7 02021 D203 255 R2S 151558 3055 ZK PL 8 x 0210 0211 0212 0 0 25 5358 2505358 MLM2902 ML Q mi 9 Sls wie s 6 5 BN 4 EINE 3 S 5 5 515 25 xd 6 0217 9218 L2 2 25 4588 2504 588 2 86 R303 33 4 030 5 x 2SC458B 30 lt 9 3 s 6 8K d 82 Us 5 Yl s 3 S 5 5 419 9 2 7x E s WII as
9. 3 25 ALIGNMENT 3 26 SECTION 4 REPAIR PARTS PARTS LIST AND ORDERING DATA nv 4 1 4 5 PARTS LIST 55 og ah yasaq HAS uut FOREWORD The purpose of this manual is to provide information critical to the long term operation and maintenance of the FTC 4610 and FTC 4625 UHF FM Mobile Transceivers In the interest of clarity descriptions have been kept brief and somewhat informal while photographs and drawings are utilized liberally We believe the material presented herein to be correct and factual However should typographical or other errors be present Yaesu assumes no liability for damage resulting from such errors Your cooperation in pointing out any inconsistencies in the technical information would be appreciated The rugged straightforward design of the FTC 4610 and FTC 4625 makes it unlikely that you will have frequent recourse to this manual We hope and trust however that the material to follow will meet your service requirements Your attention to the note below is requested Yaesu Musen Company Ltd Tokyo Japan IMPORTANT NOTE Any adjustments to the FTC 4610 or FTC 4625 which affect the transmitter characteristics or operating frequency must be performed only by an FCC licensed technician holding a Second Class or higher certificate Copyright 1980 Yaesu Musen Company Lt
10. 4610 2 501 4625 NG OK Check 13 8V to Booster Unit NG OK Check 13 8V to TX Unit NG OK Check 8 2V to NG TX Unit OK Check crystal OSC NG level at base of 0202 voltage between TP 492 and TP 497 NG For Service Manuals Contact MAURITRON TECHNICAL SERVICES 0 25V 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk Check voltage between TP 93 and TP 497 NG 0 3V Check voltage between TP 94 and TP 497 NG 1 5V Replace as necessary Check main 13 8V line Check main 13 8V line Check 8 2V line Check crystal 0 51 Check Q302 Q203 and associated circuit Check 0205 Check Q206 Transmitter dead no TX Check RF input level at 1 of NG OK Check RF output level from Q209 Check voltage at TP206 NG NG OK OK FTC 4610 FTC 4625 Check output from 501 OK Check voltage at pin 5 of Q401 NG OV Check voltage at pin 8 of Q401 NG 8 2V NG OK SERVICING Check 2 associated circuit Check AFP APC circuits Check 59 Check LPF circuit Check Q501 Check LPF circuit Check wiring betw
11. Viewed from Solder Side GATE NO 2 DRAIN GATE NO 1 SOURCE SUBSTRATE AND CASE 35 76 5 COLLECTOR 25 2407 COLLECTOR BASE 25 458 25 1906 25 1907 ANODE CATHODE GATE 01 M57704H UH SH PIN 7 PIN 1 577 SERVICING SEMICONDUCTOR CONNECTIONS COLLECTOR EMITTER BASE 25 535 25C458B 25 460 COLLECTOR BASE EMITTER COLLECTOR 2SA671 COLLECTOR EMITTER oe FLANGE EMITTER EMITTER EMITTER BASE 25 2695 8 PIN 14 PIN 7 PIN 1 NOTCH MLM2902 SERVICING LEVEL DIAGRAM RECEIVER SECTION 400MHz 21 4 MHz 455kHz 5 gt gt THE gt eme 16dB 1dB 1 BANO 8dB 18 dB 30dB 448 77 dB Q101 2nd Local Level 151 Local Level 0 3 RMS 1V RMS E 2 T a a _ 72 uS 9119 9110 130 11 100 For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01 844 352554 Email enquiries mauritron co uk P 21 4 MHz 4 o BAND I SERVICING LEVEL DIAGRAM TRANSMITTER SECTION ELSE DSS 1 o amp 3 H 4 Q Q202 Q203 Q204 Q205 14 19 16 1000 mm d P 500 9216 0203 0217
12. 0020290 88 5 Hz Description Printed circuit Board PCB with Components 90 0 Hz 91 5 Hz 94 8 Hz 100 0 Hz without Tuning Resistors IC amp TRANSISTOR 1 2902 25 460 0701 702 741 G1090222 Q703 721 G3304600B 742 748 761 781 782 D701 704 G2015550 Silicon diode 151555 131 8 Hz 103 5 Hz J20249169 o ww 107 2 Hz 1 ERO 25 CHD 4423 110 9 Hz 136 5 Hz 114 8 Hz J20249170 a 300KQ ERO 25 CHD 3003 RESISTOR 141 3 Hz 118 8 Hz 123 0 Hz 127 3 Hz Carbon film 4W TJ 330 146 2 Hz J20249171 di 137K 1 0 1008 151 4 Hz ERO 25 CHD 1373 3308 156 7 Hz R732 101245330 R717 741 101245101 R760 101245331 re J01245102 162 2 Hz J01245152 167 9 Hz J01245222 0 9 22 0 169 0 Hz 101245332 0 33KQ 173 8 Hz J01245472 179 9 Hz R756 101245562 101245822 R706 709 712 101245103 718 753 761 762 767 784 181 REPAIR PARTS R765 186 2 Hz 188 0 Hz 192 8 Hz 203 5 Hz 209 0 Hz 210 7 Hz 218 1 Hz 225 7 Hz 233 6 Hz 241 8 Hz 250 3 Hz 67 Hz 71 9 Hz 74 4 Hz 77 0 Hz 79 7 Hz 81 0 Hz 82 5 Hz 85 4 Hz 88 5 Hz 90 0 Hz 91 5 Hz 94 8 Hz 100 0 Hz 103 5 Hz 107 2 Hz 110 9 Hz 114 8 Hz 118 8 Hz 123 0 Hz 127 3 Hz 131 8 Hz 136 5 Hz 141 3 Hz J20249092 ForS 120249172 1202491
13. 137KQ 107KQ 80 6 54 9 30 9KQ 8 87 25 CHD 8871 146 2 Hz 320249182 Metallic film ERO 25 CHD 1523 152 151 4 Hz J20249183 132KQ ERO 25 CHD 1323 156 7 Hz 120249184 ERO 25 CHD 1143 162 2 Hz 120249185 ERO 25 CHD 9762 167 9 2 120249186 816 ERO 25 CHD 8162 169 0 Hz 120249202 BIKA ERO 25 CHD 7872 173 8Hz J20249187 0 0 ERO 25 CHD 6732 179 9 Hz 120249188 53 6 ERO 25 CHD 5362 186 2 Hz J20249189 ERO 25 CHD 1103 188 0 Hz J20249203 ERO 25 CHD 1063 192 8 Hz 120249185 97 6 ERO 25 CHD 9762 203 5 Hz 120249070 80 6 ERO 25 CHD 8062 209 0Hz 120249204 132KQ ERO 25 CHD 7322 210 7 Hz 120249190 u 70 6 ERO 25 CHD 7062 218 1 Hz 120249191 619 ERO 25 CHD 6192 225 7 Hz 120249192 3 069 ERO 25 CHD 5302 233 6 Hz 120249193 44 80 ERO 25 CHD 4482 241 8Hz J20249194 n 37 ERO 25 CHD 3742 250 3 Hz 120249195 4204020 ERO 25 CHD 3052 POTENTI
14. 151555 4610 11 M57704H 1 4625 10 MLM2902 1 MC301 14 MB3756 AN315 1 Varactor diodes 52 2 FET MV201 1 3SK76 2 Light emitting diodes Transistors 114 1 25 671 1 GL52RG 25 458 5 25 460 8 Thyristor 28C535B FTC 4610 9 CWO1B FTC 4625 1 4625 8 2SC1906 3 Schottky barrier diodes 28C1907 3 18897 FTC 4625 3 25 2407 1 28C2695 FTC 4625 TONE SQUELCH UNIT IC MLM2902 3 Transistors MAURITRON TECHNICAL SERVICES 2SC460B 9 8 Cherry Tree Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Silicon diodes Email enquiries mauritron co uk 151555 4 SD 06 00 2222 2 2 GENERAL FRONT PANEL CONTROLS AND SWITCHES BUSY LAMP TX PWR LAMP CHANNEL SELECTOR RESET MICROPHONE JACK SQUELCH VOLUME CONTROLS 1 CHANNEL SELECTOR This control selects the desired channel 2 RESET When the optional two tone sequential decoder is installed this control will reset the system follow ing a hailing call 3 MICROPHONE JACK This jack accepts the microphone input push to talk control and receiver muting line see Tone Squelch and Operation 4 SQL VOL The squelch SQL control silences the receiver audio output until a signal is received The volume VOL control sets the receiver volume level The VOL control should be pushed to turn on the set and pushed again to turn it off E C PIN2 5 TX PWR LEDs This lamp
15. 67 0 Hz I Ma 82 5 S62 kQ 4 4 A err 141 3 BN 146 2 186 2 68 1 Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01 844 352554 Email enquiries mauritron co uk wj J O A Table 1 GENERAL THEFT GUARD INSTALLATION USING 1 The Theft Guard feature of the FHR 1 Horn Relay box can be an effective deterrant to burglary When the line from the FHR 1 box to the FTC 4610 4625 is cut the horn will begin blaring on and off and further tampering with the car will probably be discouraged In order to make it difficult for a thief to disable the Theft Guard we recommend that the FHR 1 be installed under the hood of the automobile in a fairly dry location Alternatively it may be installed in some inaccessible location under the dash The only time that ON OFF switching should be needed is in the event of an attempted burglary as the current drain is negligible in the standby mode To quiet the horn turn the FHR power switch to OFF Installation Procedure 1 Refer to Figure 2 and mount the FHR box in the desired location The unit is not waterproof so a position not exposed to moist
16. Check SQ potentiometer or SQ circuit Check Q 2 and associated circuit Check speaker and wiring between speaker and pin 1 of O 12 Check squelch potentio meter VR a and Check noise amp Q 3 14 and associated circuit Check 1 16 and associated circuit LED won t light up Busy LED won t turn off Tone squelch not operative Improper tone squelch operation Receiver frequency is not correct Connect pin 6 of J191 to ground LED should light up NG OK Check voltage at base of 01 17 NG 0 5V Check signal at pin 7 of Q2 b NG OK Check LPF output signal at base of Q43 NG OK Check audio level at NG Check LPF output frequency and level at base of Q43 NG Check frequency at base of 1 3 fL NG OK Check frequency at TP102 without input signal NG Check Busy LED and 8 2V line Check D 08 Q 17 Check HPF buffer amp Q p SERVICING Check LPF Q41 and associated circuit Check switching circuit Q43 Q44 Q45 Adjust LPF frequency and level Adjust Check channel crystal SERVICING TRANSMITTER No TX output Check RL301
17. S m N N N NI 5 9i S S cj 313 5 ALL RESISTORS IN 21 4W 0 UNLESS OTHERWISE NOTED anii qum qu 284 0109 0110 011 770 4137 4 t 458 5 C179 140 001 455 0 3 4 207 Mew 8 R47 22K ED E r z 1 x W S S 4 8 a 9 de TA 38 37 56 uo ri 3 TR amp Ge ARPIN I p CTS E lt EE 2 ERER 42 4 313351 ISl FF TE EM 15141 1 5 1 2 155 123 J NN t jg 9 lo V 1 211 C173 rie 135 2 218967694 p PO QI L m oM 0113 0114 0115 9116 0117 0112 1 73 25 4608 25 4608 29C 46 OB 2SC460B 25 4608 AN315 ExT SP L J 8 5 N eS 3 44 gt 05 4 1 M 2103 4155 REINIS Yow 9 33K 47K 5 Q PLI 9483 344 3 1 l 2 Q206 Q 207 9208 0209 51 25 1907 C237 70203 2 C1907 25 2407 esp Q RESET 12 8 2 7 4218 3 3 t gt J 20 72205 P206 amp 2y Tx Q212 D 0212 0213 4 D MLM2902 MLM2902 2SA671B Q 3 C279 7 E
18. See m p 22 150556 13559 RK Oo RE BE bis P o PB 2148 1 2 Ee Se 0 gk 1 ye 10 5 095 N yal Roe 6 9217 0218 i v 22 g 2SC4588 2SC4 588 25 4608 9 L For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk 244282 02 123 22K 553 0 0 010 0102 0106 0108 DER 0109 0110 QI 35 76 3SK76 217282 2505358 2565358 Sas 25646086 2564608 croz 5 02 0 XF 02 cisz TPIO2 C168 37 2169 RIII 2815 8 7 05 706 2 007 Q 990 180K 0 00 150K 5 Le 3 4 Crs 5 x N 4 ee AL 45 7 IK 5 5 u i she Q 5 ph 5 s 5113 030 il T 5 LHO 4 1116 J f 25 1K 1 mh 2 24 Lisi C 56 10P C47 4 2 00 57 Vrs L T 0103 0104 0105 1709 Q107 25 5358 25 1906 x1 2SCI907 99 ool 25 535 47 103 129 100 0113 0114 0115 0116 0117 254608 254608 2SC 4608 25 4608 25 460 amp 9 260745 5 06 NON 0107 Bias te Sx vs Sl lt 154555 gt 83 2 55 25 3 5
19. WARNING NEVER APPLY AC POWER TO THIS TRANSCEIVER NEVER CONNECT A DC POWER SOURCE OF GREATER THAN 15 VOLTS TO THE REAR PANEL POWER JACK ALWAYS REPLACE FUSES WITH A FUSE OF THE PROPER RATING FAILURE TO OBSERVE THESE SIMPLE PRECAUTIONS WILL VOID ALL WAR RANTIES ON THIS EQUIPMENT GENERAL INSTALLATION STEP BY STEP OUTLINE Determine the optimum location for the transceiver making certain that there is sufficient space for the transceiver its cables and switches and the microphone Leave several inches of space around the heat sink to permit free air flow A universal bracket is supplied with the trans ceiver Use the universal bracket as a template for positioning the mounting holes Use a 3 16 diameter bit for drilling these holes allowing clearance for the transceiver and all accessories and cables Secure the mounting bracket with the screws washers and nuts supplied as shown in the drawing Ease the transceiver into the guide rail and slide it into the desired position Tighten the knobs on the outside of the universal bracket to secure the transceiver The key lock mechanism may be mounted either on the left or right side of the mount ing bracket Just remove the four screws holding the cover plate on the bracket and install the key lock in its place The plate can then be installed on the side opposite the lock Confi
20. 1000 Hz 3 kHz deviation 5 MHz RX spread over the range 450 512 MHz Spurious emissions At least 60 dB below carrier Oscillation system Crystal control AF distortion 10 or less 1000 Hz 3 kHz deviation Weight 1 5 kg FTC 4610 Antenna impedance 1 6 kg FTC 4625 50 ohms Dimensions Microphone type 50 H x 122 W x 192 D mm 4610 Low impedance 600 ohm dynamic 50 x 122 W x 243 D mm FTC 4625 Crystal multiplication Power requirements x 12 DC 13 8 volts negative ground Power consumption RECEIVER Standby Less than 0 1 A Receive Less than 0 3 A Sensitivity Transmit Less than 3 0 A FTC 4610 Better than 0 54 V for 20 dB noise quieting Transmit Less than 6 0 A FTC 4625 Better than 0 35 for 12 dB SINAD Number of channels Adjacent channel selectivity 7 Better than 80 dB Image rejection TRANSMITTER Better than 80 dB Power output Intermodulation 10 watts FTC 4610 Better than 70 dB 25 watts FTC 4625 Squelch sensitivity Frequency stability 0 20 V Better than 5 ppm AF output Modulation type 0 5 watts for Internal Speaker 16F3 16 ohms 10 THD 1 5 watts 8 ohms 10 THD 3 watts Deviation 4 ohms 10 THD for External Speaker t5 kHz Specifications subject to change without notice or Audio response obligation 1 3 dB of 6 dB octave pre emphasis characteristic from 300 Hz to 3000 Hz GENERAL SEMICONDUCTORS IC Silicon diodes 577
21. J 1 c x K K SEEN 720 7 205 72206 3 7 J2 1 2SC5358 MLM2902 MLM2902 25 6718 9 2 7 25 4588 5 0401 53 64 52 MB3756 440 PB 2027 2 j M 3 r PN 4 2 3 t s gt S 2v T7X S i opm gd 313 8 N M u J 5 I ALL RESISTORS INN i 4W 10 UNLESS OTHERWISE NOTED 2 ALL CAPACITORS IN pF UNLESS OTHERWISE NOTED FTC 4625 3 COMPONENT SEE BANO CIRCUIT DIAGRAM TABLE
22. NG OK Check voltage of semi conductors RF and IF sections NG OK Check RF input level at CV19 NG SERVICING Remove 13 8V DC line from power socket and locate short in power circuits Check 8 2V supply line Check 13 8V line from pin 2 of Check squelch potentio meter and associated circuit Check crystal and associated circuit Check Adjust check os and associated circuit Check the faulty circuit Check wiring between antenna relay and CV SERVICING No audio Squelch circuit not operative Check RF input level at gate 1 of Q101 NG OK Check RF input level at gate 1 of Q102 NG OK Check for audio output atpin 9 of Q112 NG OK Check for voltage at pin 10 of Q112 NG 0 8V Check for signal at pin 1 of Q112 NG OK Check noise level at pin 9 of Jior NG OK Check noise level at collector of Qing NG OK For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tol 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk Check Qio and the associated circuit Check RF level at pin 5 of 20 signal input at Jack Check discriminator x
23. 2 2 Multiplier stages Equipment needed 2 3 Bandpass filter 1 Precision UHF signal generator 2 4 Spurious reduction 2 Precision UHF frequency counter 2 5 Deviation setting 3 Sweep generator cover upto 500 2 6 RF power output 4 Alignment scope 2 7 AFP circuit 5 Audio Voltmeter 6 DC voltmeter Tone Squelch 7 Vacuum tube voltmeter 20Kohms volt use 3 1 Encoder output level adjustment able upto SOOMHz 3 2 Decoder input level adjustment 8 Bench power supply 3 3 Tone frequency adjustment Es MAIN UNIT MAIN UNIT M ____ TRANSM RECEIVER SECTION k SECTION o ams 2 2 For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk ee x s m m n m um Z m 4 P gt WU RR SERVICING ALIGNMENT RECEIVER 1 4 First Local Connect the RF probe of a to the 1 1 Second IF base of Adjust and Tyo for Connect a 455 kHz sweep generator to the maximum indication on the base of Qios and connect an XY scope vertical amp input to pin 5 of 1 Adjust Connect the RF probe of a VTVM to gate Tio for maximum p p indication on the 2 of Qio Adju
24. S0000MH 4500 4 1 CIRCUIT DESCRIPTION RECEIVER The incoming signal from the antenna is coupled through helical resonator to RF amplifier Qio1 35 76 dual gate MOS FET with excellent rejection of cross modulation The amplified signal is then passed through a four stage helical resonator to the first mixer where the RF signal is mixed with the first local signal delivered from 2SCS35B resulting in a 21 4 MHz first IF Local oscillator uses up to seven HC 25 U crystals operating in the third overtone mode and indi vidual trimmer capacitors for each crystal allow precise adjustment of the channel frequency The output from Q o is coupled through Ciz to oscillator multipliers Q 28C1906 and 28C1907 then link coupled through to gate 2 of the first mixer 3SK76 The output from the first mixer is tuned by to the difference frequency of the input signals then passed through monolithic crystal filters and XF o and amplified by Qi 28C535B The IF signal is then delivered to the second mixer where the 21 4 MHz first IF signal is mixed with a 20 945 MHz local signal generated by 28C535B producing 455 kHz second IF The second IF signal is fed through filter CF 01 amplified by 2SC460B and fed through another ceramic filter CF 5 The IF signal is then fed amplifier limiter uPC577H limiting action
25. Tan 2 4 MAC MERE ut d XLI ay PERLE SEI CH ta P ty 8 vats hey G il LAS PP N TDI MM ite atra e te QdMVO8 NIVIN 0197 5413 LNOAVT 51 ONDIAYAS 13ueuoduio 52 4x Mh TOMARON amp a 8 601 2 24 o tO x s v A ANN PICEA tm ERA EORR Conte MER ER REL ROOT me Y S DR lao es Ite DOE RSs 5 ROW IU A EAE RINE EU Z NIVIN 97 214 SLHVd ONIOIAN3S L2 ax ge a Sm anu ah EL MRL tA ALATA bd gE r PIS o 55 5 0 gt 2 8 i ce 2 SHE 240558 S Q ke ae g 85 S lt o 2 D gre see 2 gt x 5 0 323732 EAS Parvo te 5 4 i lt 4 5 5 2 2 5 M3IA 01108 ON 4 mari 9 110 5 9004 156483 019 914 50 SNOILO3NNOO AV 13H
26. x 1504 10007937 TT 1s 0208 _BOOSTER UNIT FTC 4625 1505 _____ 11020663 __ _____ symbol number Printed Circuit Board NAMEN RAY 0021070 P C B with Components ___________ _________________ 0 __ 232695 RENE 37 22 0 Si 151555 dl RESISTOR BOOSTER CONTROL UNIT FTC 4625 501 Carbon film 4W TJ 5600 Symbol Number Description PB 2118 F0002118 Printed Circuit Board C0021180 P C B with Components D601 G2090140 Thyristor 1 4 e e Potentiometer TT 150707501 822 501 5002B NENNEN 501 RESISTOR R601 701245224 Carbon film 220 0 POTENTIOMETER VR601 150707103 822 103 10 CAPACITOR Ceramic 5 2pF DD104CH020C50V02 C518 520 K02179003 C517 519 K02179055 23 e e 2222 636 09308 CH 4pF 2222 636 09408 2 55 45 K02172050 a SpF APACITOR 527 DD104CH050C50V02 C601 603 K10179014 Ceramic SOWV 0 001uF C503 509 K02173090 CH 9pF CK45B1H102MY DD104CH090D50V02 C604 K70127475 Tantalum 16WV 47 100pF CSISE1C4R7M 2222 637 10101 C501 516 K10179014
27. 0 0014 K02179053 ta e to CA CA ON C511 514 K02179049 601 0090097 TERMINAL R702 703 750 101245223 Carbon film 22KQ 5049 05 757 788 reRMNAL 0090097 5049054 __ 0145333 eR R0 J01245683 23 101245104 J01245154 50KQ ACCESSORIES R746 747 159 Part Number Description 766 T9012904B POWER CORD FTC 4610 AULAE ELE P0090184 Power Connector 3191 02P 470 Q2000001 Fuse Holder SN1101 n v e 18 Q0000006 Fuse 4A Metallic film 4W 6 19KQ 1 R707 120249039 15 0 1 POWER CORD 4625 R710 713 120249041 22KQ Symbol Number T9013410A P0090184 Power Connector 3191 02P R721 729 744 J20249043 4 82 5K2 41 Q2000001 Fuse Holder SN1101 R763 J20249045 4 100 519 0000007 Fuse 10 R714 120249027 i 04 4 12191 1 77 s MICROPHONE R708 o 470 1 YM 30 R705 ANE Microphone Plug FM 146P MEER e J20279006 Metallic 50 CHD 1004 0 5 50 PPM M3090019 1090021 MOUNTING BRACKET FMB 2 Tl da N 79 7 Hz J20249168 JB NE 562KQ TONE SQUELCH UNIT OPTION 81 0 Hz ERO 25 CHD 5623 82 5 Hz 0 5 50 PPM PB 2029A F0002029A 85 4 Hz
28. 176 178 180 MRS 473K Sa C259 260 70160001 Tantalum 35 00 TRANSFORMER MDST473F 10190012 113KN 6405Z C185 K70167104 2 2 0 1uF 3 113KN 6409X 1135 3392 194 70167154 0 15uF 207 C253 0 224 199CC 11114N 0 68uF 10020667 113CN 3393Y CS15E1 VR68M I 13KN 6407N C186 199 254 K70147105 0 25WV 3 113KN 6406N 255 403 515 1 010 10190014 113KN 6408Z 77777 10020429 1135 4530 m wo e e Oro gt Ain 101 81 1 C510 513 523 23170001 Ceramic chip 50 0 0luF BERE 524 GR42Y5U103Z 7127 2221 22 10 K70167106 Tantalum 35 100 RAY 515 1 100 M1190008 1190008 FBR 221 D006 CONNECTOR 0090054 5048 07 0090092 3022 08 70127226 401 e ra 20 CA tr C3 gt t TRIMMER CAPACITOR CRYSTALPINSOCKET 502 503 K91000073 2222 808 61159 K91000072 2222 808 51229 22 x j jn 0500037 a coma 16666 1002074 506 1501 MAURTRONTECHNICALSERVICES cherry Tigo a soz TTT Teh 01844351694 Fax 01844 352554 1503 10020889
29. 25 S 5 So lt 4 7 3 z 3 3 z 4 Cz 5 40712 4002 E 001 gt 27 40019 4004 90019 2 S19 0 2 go 62 92 gt 58 gt ZO 01 lt 2 T O 9 0 29 0 206 3 20 722 7 4 0 Le 4 lt 4001 4 9 192 oe UNO J Si NOW 1021 04 1 1 t t 3 1 170 2518 38 2 400 14 Of OL tid TECHNICAL NOTES CHANNEL CHANGES 1 Channel Modifications within Present 3 MHz TX or 5 MHz RX Operating Range Channel change within the existing operating range of the transceiver are simple to perform a Insert the desired crystals into the local crystal sockets see the CRYSTAL DATA 4 page 2 4 for crystal specifications b Connect a frequency counter to the base of Qios through a 0 01 uF capacitor and adjust the appropriate trimmer through TCio9 for the correct frequency RX Chan nel Frequency 21 4 9 MHz c Now connect a frequency counter to the base of While transmitting adjust the appropriate trimmer capacitor TC os through TC514 for the correct frequency TX Chan nel Frequency 12 MHz d If the channel modification is very close to the present band edge and the set has not been in for alignment for som
30. 250 302 R156 170 218 J01245104 r 100 C153 K06179021 UJ 33pF 256 283 287 2222 636 58339 R102 106 137 101245154 150KQ C145 252 K05179013 33pF 139 258 276 2222 637 40339 77 2222 637 40479 3222 637 58569 7 5609 2222 637 40569 _ 6800 C233 CH S6pF 2222 637 10569 R111 J10246561 R261 J10246681 I C e A gt re UJ 68pF 2222 637 58689 5 6KQ C155 K06179041 UJ 100 R172 178 110216103 Z TSW 2222 637 58101 289 295 dni C197 207 K02179049 CH 100pF 112046223 Z 22KQ7C131 203 K06179042 UJ 120pF USW 33KQ 2222 637 58121 R179 185 710216333 296 0302 C213 217 275 K02179032 7 CH 120pF 304 2222 637 10121 4 Mana MAURITRON TECHNICAL SERVICES aes pe 8 Cherry Tree Rd Chinnor See BAND TABLE Page 2 9 Poen AVN AMY REPAIR PARTS Ceramic SOWV PH 150pF C160 163 175 K70127475 16WV 4 7uF C154 K06179022 UJ 7 C158 166 172 K70127106 Tantalum 16WV 10 2222 637 58221 183 188 192 CS15E1C100M 2222 660 02331 262 266 283 2222 660 02471 eer CS15E1C330M 820pF 6257 K70127476 2222 660 02821 CS15E1C470M C103 105 106 K10179014 0 0014 C404 406 K40129007 Elect
31. 5 TC207 For Service Manuals Contact SS T C206 MAURITRON TECHNICAL SERVICES 3 TCs BONO oxa sar Tes 01844 351694 Fax 01 844 352554 Email enquiries mauritron co uk TP201 gt 09 T 208 7 T 207 T 206 TP202 T 205 Q203 So es gc 4625 TRANSMITTER SECTION ALIGNMENT POINTS SERVICING ALIGNMENT TONE SQUELCH 3 1 Encoder Output Level Adjustment Assemble the test equipment as shown in Figure 10 Adjust for deviation of 0 5 kHz without any mic input signal Connect audio generator to the mic jack then apply a 5 5 mV 1 kHz signal If the maximum deviation is other than 24 9 kHz readjust 7 AUDIO GENERATOR Fig 3 2 Decoder Input Level Adjustment Assemble the test equipments as shown in Figure 11 Set the output of the signal generator to 30 dBu with modulation of kHz 0 5 kHz deviation Connect the level meter to pin 7 of Adjust for an output level of 10 mV XCVR SIGNAL GENERATOR EXTERNAL MOD INPUT AUDIO GENERATOR Fig 11 TONE SOUELCH UNIT ALIGNMENT POINTS 3 3 C M COUPLER LINEAR DETECTOR FREQUENCY COUNTER Tone Frequency Adjustment When the tone frequency needs to be changed Replace according to Table 1 You need not to readjust VR 44 as long as 1 t
32. 50 AH 0 5pF R124 125 128 132 133 136 143 154 220 223 234 256 270 273 R115 118 135 138 140 141 c 7 101245222 226 230 247 2222 636 03507 254 K02179002 AH 1 5pF R146 153 162 J01245332 DD104CK 1R5C50V02 163 197 236 K02179003 AH 2pF 244 DD104CK020C50V02 R113 122 130 159 164 240 DE C244 K02179045 CH 2pF 2222 636 09208 255 C238 K02189002 2 CH 22pF J01245562 ic P M Wanay RD870 2NPO2R2C63V 285 288 247 248 250 K02172030 CH 3pF R157 301 J01245682 DD104CH030C50V02 R245 253 101245822 Ko2172040 CH PF R107 112 144 301245103 109 DD104CH040C50V02 145 150 198 C104 147 K05179002 RH 5pF 203 207 224 2222 636 39508 228 231 252 C149 K02179038 n CH 7pF 257 260 262 2222 636 09708 268 271 274 C140 K05179005 RH 8pF 278 281 2222 636 39808 R272 101245153 ska K05179007 0 CH 10pF R116 119 123 J01245223 2222 636 40109 126 131 161 169 251 259 286 2222 636 10109 R101 105 127 J01245333 231 2222 636 10129 148 155 167 C0208 0214 K06179051 UJ I2pF 196 215 217 x Ie 2222 637 58129 246 248 284 CH 15 RD 70 1NPOLSOI63V R103 142 151 101245473 aA K05179010 RH 18pF 208 216 249 pue 2222 637 10189 C218 232 K05179011 A RH 22pF 2222 631 40229
33. AC POWER SUPPLY 2 5 5 AC POWER SUPPLY TONE SQUELCH UNIT FTS 2 2 6 CHANNEL 6 2 2222222 7 000 2 8 BAND TABLE SECTION 3 SERVICING OUTER COVER FRONT PANEL REMOVAL 3 1 FP 5 FP 6 OUTER COVER REMOVAL 32 PARIS LAYOUT 3 3 VR LED UNIT PARTS LAYOUT 33 BOOSTER UNIT PARTS LAYOUT 3 8 BOOSTER UNIT MOUNTING DETAIL 3 9 SQUELCH UNIT PARTS 3 10 SEMICONDUCTOR CONNECTIONS 3 11 LEVEL DIAGRAM TOES 3 12 VOLTAGE CHART 3 14 CIRCUIT DEVICE INFORMATION 3 5 SOLDERING AND DESOLDERING TECHNIQUE e 3 16 FAULT LOCALIZATION 3 18 TROUBLESHOOTING ees eae 3 19 MAINTENANCE AND 22 2 2 2 2 2
34. CA 90723 YAESU ELECTRONICS CORPORATION 9812 Princeton Glendale Rd Cincinnati OH 45246 ORDER BLANK n TRANSCEIVER IDENTIFICATION x ee BEE CIRCUIT DESIGNATION authorize shipment via Best Way Parcel Post 0 UPS O Other Ship To Name 2 25 ee ee Print Type Address na ed U City State Zip Country OPEP YAESU MUSEN COMPANY LTD BOX 1500 TOKYO JAPAN YAESU ELECTRONICS CORPORATION 6851 Walthall Way Paramount CA 90723 YAESU ELECTRONICS CORPORATION 9812 Princeton Glendale Rd Cincinnati OH 45246 ORDER BLANK LOCATION CIRCUIT DESIGNATION TRANSCEIVER SVANT IDENTIFICATION I authorize shipment via Best Way Parcel Post 0 UPS O Other Ship To Name MEME Print or Type Address City State Zip Country For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Chinnor Oxon OX9 4QY 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk FTC 4610 4625 PARTS LIST REPAIR PARTS MAIN CHASSIS 0401 G1090222 IC MB3756 0212 G1090220 MLM2902 Symbol Number Description 1090072 uPC577H G2090034 Si 0058 0101 102 04800760 FET 35 76 G3106710B 62090086 LED TLO 114 TR 25 671 62090087 G3304580B 25 458 2027 0002027 L
35. R109 101245124 m MAIN CHASSIS R108 J10276151 composition YW GK150Q ipti 110276471 2 4700 TRANSISTOR J30376029 Cement SW 0 20 5051 1 d A 4 9 AIT Description gt Symbol Number G3090014 150702202 EVLSOA 00823 2 CAPACITOR K14170103 Ceramic SOWV 0 014 lt 23 2090022 CAPACITOR 43160002 Electrolytic 35WV 10000uF 351 10000 C102 POWERTRANSFORMER cis KS0177103 Mylar SOW 309006 0720 103M C104 50177104 0 50 0 SOF2U 104M C101 K41140108 Electrolytic 25WV 1000uF ECEA25V 1000U 00000003 2A 100 117 DC FUSE HOLDER P2000003 00000002 1A 200 7 101 P2000003 3265 F101 Q0000006 Q5000011 Wrapping terminal C AC FUSE HOLDER 2 2000017 090017 56000022 AT449B Black knob 4090034 ACCESSORIES j 5 MR Description Q0000003 100 117 Q0000002 1A 200 234 o lt 3 9 2 3 9 0290014 PLUG P0090034 P 2240 SP T9013099A 3191 02 DC OUT 59 g Q0000006 4A EEUU EIN M LIC CMM LC MCCC CI CQ EMEC REPAIR PARTS AC POWER SUPPLY E Q0000012 Q0000004 6A 100 117 200V 2
36. ment procedure may be necessary to achieve th band should be adjusted as follows proper bandpass Connect the RF probe of a to base 2 4 Spurious Reduction of Qro2 and adjust for maximum reading Connect a 6 dB hybrid combiner to the onte VIVM Detune it until 80 of the antenna jack Connect a dummy load watt maximum reading provides stable Output meter and a spectrum analyzer to the hybrid Do not adjust because it is for frequen Adjust for minimum spurious emission cy compensation and its alignment is extreme over the range 1 3 ft to 4 3 ft ft TX ly critical frequency Now adjust for minimum spurious signals over the range 10 12 ft to 2 2 Multiplier Stages 14 12 ft Leave the dummy load wattmeter connected to the antenna jack VRao2 fully clock Recheck the bandpass filter tuning after wise Now connect a DC voltmeter between TP 39 Adjust T2os for maximum indication on the voltmeter Now adjustment of TC o7 XCVR Q203 BASE 0 01uF SWEEP OUT DUMMY LOAD GENERATOR WATTMETER Q209 PIN 1 Fig 7 2 3 TEST SETUP For Service Manuals Contact Fig 8 MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk SERVICING 2 5 Deviation Setting Assemble the test equipment as shown in Figure 9 Inject a 1 kH
37. of Q eliminates any amplitude variation in the IF signal which subsequently is fed to the discriminator The discriminator consists of Diot Dio2 181555 and a ceramic discriminator element The output from the limiter is coupled through to CDio1 then rectified by Dio and D o producing an audio output in response to a corresponding frequency shift in the IF signal The audio output signal from the discriminator is fed to a notch filter which tunes out the 455 kHz IF signal present The signal is then fed through pin 1 of to the optional tone squelch unit When the tone squelch unit is not installed the signal is fed via a jumper to the de emphasis network consisting of Ria and The de emphasized audio output is fed through the audio volume control 15 to audio amplifier AN315 which delivers 1 5 watts of audio output power to the speaker When no carrier is present in the 455 kHz IF the high frequency noise present at the discriminator output is amplified by Q and Q 4 2SC460B then detected by Dios and 151555 pro ducing a DC voltage This voltage is amplified by and 5 2SC460B and fed to pin 10 of cutting off the audio amplifier A portion of the DC voltage is also used to control Q 2SC460B for BUSY lamp operation When a carrier is present in the 455 kHz IF the noise is removed from the discriminator output and the audio amplifier then recovers to n
38. the output amplitude of the signal generator until the voltmeter indicates a 20 dB decrease 1 10 voltage of the reading in step b The Signal generator output voltage at this point is the 20 dB quieting sensitivity and it should be approximately 0 5 u V SIGNAL GENERATOR TRANSCEIVER RX SENSITIVITY TEST SETUP If the above checks are both OK then clean out the transceiver by applying moderate force compressed air throughout the chassis area This will remove any dust that may be present If there Is accumulated dirt inside the cabinet a soft brush may be used to loosen it Wipe the outer cabinet of the transceiver with a damp cloth and use the compressed air to dislodge accumulated dust present in the corners of the radio SERVICING ALIGNMENTS PRELIMINARY ADJUSTMENTS 9 Alignment tools 10 Interconnection cables Internal adjustments should undermost circum stance be limited to those described in the Alignment steps paragraphs below I Receiver 1 1 Second IF Remove the four screws five screws FTC 4625 1 2 Second local from the top cover Then the four screws five 1 3 First IF screws FTC 4625 from the bottom cover in 1 4 First local order to provide full access to the transceiver 1 5 RF section circuitry 1 6 Sensitivity peaking 1 7 Squelch sensitivity NOTE Use nonmetallic tuning wands to adjust trimmer capacitors and coils H Transmitter 2 1 Oscillator
39. 0 2 036 1 O x K amp 3 8 N fe gt amp 5 x 215115 3 33 gt 5 S lt amp 5 i T J BIST L 0 9 Ti 8725 IK 6123 C156 6 247 73 C174 pes P 600 6 061 CH n d QIO3 0104 0107 25 5358 25 1906 3 2SC535B uc gud R29 100 0113 0114 0115 0116 25 4608 25 4608 2SC 4608 2524608 N amp sx 22 1 x 762 3 x 20 945M 7 24 5 Riss a 8 2 pas wa SI s 15 555 STA 7 883 LL 9 8 5 8 d 5 218 x 51259143 1 44 NX 3 o YU ys 0103 RISS S 19 JE 2 54555 33K 4 7K or S 2 9 o gt 797 0201 0202 0203 0204 0205 9206 Q 207 Q20 25 5358 25 5358 42 3 25653858 25 1906 25 1906 25 1907 6237 72203 25 1907 25 2 lt 220 5 230 0 5 5 2 S ZOPCH x 70204 lt 2 4P L2 ly 00P CH x 5 0 5 9 848 N M SEN 020 7204 MES a si 3 1 20 lt 5 5 x 813 45131 551 Ass SLS 8 5 cios gt 8 9 N Q 3 in N Rt 9 o amp e NI Qj h lt 8237 2 2 02215 99 4 7 2 gt 77205 72204 9211 Q212 nels 2565358 25 4588 Y
40. 16 517 L218 C246 C247 C248 C249 and C2so In the FTC 4610 the RF signal is then fed through antenna relay to the antenna connector In the 4625 the RF output signal is fed to Q5o 2SC2695 located on the BOOSTER Unit The output signal is then fed through a low pass filter consisting of Lsos Lsos Csi7 Csis C520 C522 and C526 The signal is then delivered through the antenna relay to the antenna jack Automatic Power Control APC Circuit A portion of the RF signal from is coupled through stray capacitance on the circuit board trace to the base of 0 2SC535B which acts as a rectifier The resulting DC voltage is fed to section d of Q4 MLM2902 where it is compared with a reference voltage delivered from 2SC535B The DC voltage is then fed through a DC amplifier at D 25 458 28A671 to on the RF power module controlling the supply voltage to the final amplifier stage In the FTC 4625 the rectified output from the directional coupler is fed to 0 d for amplification FTC 4625 Automatic Final Protection Circuit The directional coupler produces a rectified DC voltage when reflected power is sensed This voltage is fed to D CW O1B which sends cutoff command to Q the reference voltage regulator For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Te
41. 2203 0204 0205 0206 0207 2208 2229 gues M40 BFF Dune Doug TRIP ST AMP ND PWR up FC52M 250535 25 535 250535 25 1306 2561906 2501907 2901907 252407 577 0205 0211 301 58 21 5 92 2 2 lt im 0218 0214 7213 2212 0212 0 020 21 MIL AMP LPF Yn AMP DC CIFF amp REC 252458 295458 5 55 5 257458 256460 25267 255458 MLM290 2 2505 3512 37500MH 3 450 00C MH 4 214 4 12 00 MHI 4 t 1 Que 9106 6102 010 5 PWRAMP 2156 AMP 455 FAL 2NO F 455 FIL ANO MIX IST IF AMP 2141 FIL IST MIX RF AMP 44315 4540 577 8 15 250460 12 LFB 5 252535 2556535 214 282 35K 76 35x76 JZ Hk HEH EHS 2NO LOCAL OSC 250 535 20 945 T 216 5 0103 0 04 08 Ol 53 0904 0 08 DC RE NO S MPF TCXO 151 LOCAL TRIP TRIP 250460 2 151555 12 25C460 12 52 056 25 906 2561907 N EE Wet 428 GOOMHz 4906 OOMHz 47 622 142 867 545uMHzr 163535 MH 040 STB MB3756 47622MHi 4 Si IMHz 13 8v 8 2 i e For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor FTC 4610 BLOCK DIAGRAM Email enquiries matuitron co uk 4
42. 3 Mylar SOWV 0 01 SOF2U 222M K50177104 M Y 0 1uF SOF2U 104M 13030071 101 M4090033 SE 128A 80 3W 0290014 1 102 d Q5000011 Wrapping terminal C ACCESSORIES 1 P1090049 QMS P4 FC DC OUT use with wire T9202480A 9000012 0001 117 ____ P 2240 SP I HANE a ________________ FUSE HOLDER P 09000086 OS PAM with rubber SN 2050 BERE Sara C 02 SOF 47K 7 03 9103 0104 0105 303 33 0107 ORE 25 5358 25 1906 25 1907 2SC535B AD SE OSP AH 0 77 301 RIZ RIT6 0 K sar Ri77 RIES 70 03 70198 02 3 C02 4 2P 528 resem SP RIG 8 3 3 22K 2 5 L113 vy 9 L2 Pol i T 0201 0202 9203 9204 9205 25C535B 25 5358 25 5358 25 1906 25 190 266 200 220 C2 B 22 224 5 7201 zoren P 207 1 q CH Car R20 o 9 o S X lt xt 3 b 2 100K _ x c ae 2 3 SES 5 255 55 5 2 53 lt r At M 8 2 DECE D211 MC301 289 285 10k Yew 3 2 RO202 33k 70208 702 20 292 C298 12 UJ 0215 r 3 2SC458B Sh CNN
43. 34V FP 6 MAIN CHASSIS TRANSISTOR 250114 2SD235Y Of 6 Symbol Number M AC POWER CORD 3 wire 3 prong plug UL UP365A04 01 4 G3401140Y T9000482 Un Q lt lt q 5 o a pnia MAMBITRON JNICAL SERVICES T9000684 3 wire 2 prong EU plug rd 8 Cherry Tree Rd Chhnnor __ 11 03 DIODE nes d A 1 352554 T9000680 3 wire 3 prong Australian plug G2090121 S25VB10 Email enquiries mauritrolco uk SP 400 004 J10276471 Carbon composition GK 4702 ECK DAL 103PE K41140108 Electrolytic 25WV 1000uF 25T 1000 K43140002 47000uF R106 CE62 47000 R105 710276222 fri 10276322 7090005 WD9223 R104 J20306102 Metallic film 1W RS1PJ TERMINAL Q5000008 T203 Red Q5000009 T203 Black 0 POWER TRANSFORMER RESISTOR wo o Cement 10 020 REGULATOR BOARD SQ10L R20 2089 20002089 Printed circuit board 2089 Board with components RENE ee ue ee ee E 5 K13170103 Ceramic 509 DD107F103Z50V02 2222 SS ee w UN C3 4 K12329001 1 4 7 Q101 G1090036 RESISTOR Carbon composition 4W GK 120K 9 WW 1002 110246124 110276101 7 e POTENTIOMETER EVL S3A 00814 LOKQB 151721103 CAPACITOR K5017722
44. 73 120249196 720249174 120249197 120249198 120249175 120249199 120249176 120249200 120249201 120249177 120249095 120249064 720249178 120249179 120249079 120249171 120249086 120249070 120249095 120249180 120249181 MAURIT Metallic film 68 1K2 ERO 25 CHD 6812 Manuals Contact ON TECHNICAL SERVICES erry Tree Rd Chinnor Oxon OX9 4QY 844 351694 01844 352554 Email enquiries mauritron co uk ERO 25 CHD TYPE 0 5 50 PPM Metallic film 374K2 ERO 25 CHD 3743 tr re 25 CHD 1913 27 191 LISK2 ERO 25 CHD 1153 ERO 25 CHD 4022 ii 407KQ ERO 25 CHD 4073 2 ef ERO 25 CHD 3793 of LE 40 2KQ 379KQ 344K2 25 CHD 3443 9 tr ERO 25 CHD 2843 8 25 CHD 2263 Fr ERO 25 CHD 2003 er tt 25 1743 te ERO 25 CHD 1243 ir oe 284K 226 200K2 174 4 124 0 54 9 ERO 25 CHD 5492 2 LE ERO 25 CHD 1333 84 ae ar ERO 25 CHD 9532 st 87 ERO 25 CHD 5972 87 79 te ERO 25 CHD 1693 oF tt 25 CHD 1373 2 4 25 CHD 1073 oe La ERO 25 CHD 8062 25 CHD 5492 LE 2 ERO 25 CHD 3092 34 133KQ 95 3 59 7KQ 169KQ
45. 94 Fax 01844 352554 Email enquiries mauritron co uk AC lOOV POWER TRANSFORMER PRIMARY CONNECTIONS GENERAL INTERCONNECTIONS For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01 Email enquiries mauri FP 6 6 4610 4625 FU AC insert Short Plug JSP FUSE GENERAL TONE SQUELCH INSTALLATION 5 2 CTCSS module option can easily be installed in a matter of minutes Inspect the frequency table accompanying this section and select the resistor appropriate for the tone signal to be used Install the selected and onto the FTS 2 PB board and be certain to use only a 1 tolerance metal film resistor Remove jumpered plug and connect P702 of TSQ UNIT Use 2 6mm screw VR743 VR748 Q761 745 Q741 m __ Rk 11 14 TSQ UNIT Use 2 6mm screw Refer to Figure 1 and unplug P from its jack Jio Install the FTS 2 into correct position and connect into and into 7 US models use the FTS 32ED module See your Yaesu dearler for details of the FTS 32ED for the US model a RR PI ee After Installation Figure 1 f EFI TM DE Me I GENERAL TONE SQUELCH TUNING RESISTOR CHART
46. A o amp 6 502 i N jozo 21221 r 2 082 44 1 0 88 44 14 Core Sos Q215 258 98 Qm 822 MI VOHA t W 15 888 341885 8 5 R243 92 2 um cg 9 00 0218 N p mF F s 3 of 412 22 7 m 7877 7095 4 9 Yer dii diii 4 3 me 2992 wn yip 20Ey n 2 2 QG n 5 i N 1 1 a t 2 ri I 32 sdb Vorrat pe dir 15 70 alee joo S gt 20592 lt 8 5 e oS 10921 6 d22 t N 2 3 5 3 2052 amp 5 5 L 945 GER gt ew Queue QAM Du Q oe ee amp gt 0101 0106 0108 0109 0110 Q 3SK76 22282 2S5C535B 2505358 eis 2SC460B 25646068 c r RH 02 07 2 C152 5 102 ch RIIT 2169 2815 7 06 9 20 2 20 0 00 130K Te I c je C d ale lt 57 42
47. ALE SWITCH TO REFLECTED READ SWR ON METER TYPICAL SWR TEST SETUP PHYSICAL LOCATION OF TRANSCEIVER The FTC 4610 4625 may be installed at any angle desired without loss of performance Typical locations are atop the transmission tunnel below or in the dash board or overhead in trucks etc When considering a possible location for the trans ceiver several factors must be considered First there must be room for the transceiver cables the microphone and heat sink We recommend that several inches of space be available around the heat sink to allow free air circulation Also we recommend that the transceiver not be located directly in the path of the output vent from the car heater Another consideration is the routing of cables to the desired installation location If the power cable to the battery or the coaxial cable to the antenna must be extended greatly in order to meet aes thetic considerations the increased losses may degrade performance Fortunately the common under dash installation lends itself well to efficient performance as the power cable can be fed through the fire wall One final consideration is safety The transceiver and its microphone must never be installed in a position that may interfere with driver vision or Operation of the vehicle Be especially wary of stick shifts in compact cars and allow plenty of room for unobstructed manipulation of the con trols FTC 4610 4625 are v
48. B while the BPF provides the feedback needed to start oscillation at specified tone frequency The oscillated tone signal is amplified by 2SC460B and fed through to in the IDC circuit TECHNICAL NOTES TECHNICAL NOTES FR V FREQUENCY RELATIONSHIPS 450 51 2MHz 21 4MHz 455k Hz RF AMP Ist MIX 2nd MIX 2nd IF DET amp AF OSC MULT CTS x3 x3 20 224 Fo LE MHz CRYSTAL DATA HC 25 U or HC 42 U 450 MHz 512 MHz Oscillation Frequency TX CH 12 MHz RX 21 4 MHz 9 MHz 1 Type of holder 2 Channel Frequency TX 40pF 50 Hz 0 RX 32pF 120 Hz 0 5 Drive Level TS 683 TMS 2mW TX 37 MHz 4 7pF 0 5 38 MHz 4 8pF 7 RX 47 MHz 4 4pF 0 5 48 MHz 4 5 0 5 10ppm at 25 8ppm 2ppm at 20 C to Oppm 8ppm at 60 C 25 C reference 162 max series 3rd order overtone Load Capacity 6 Shunt Capacity 7 Frequency Tolerance 8 Frequency Stability 10 Operation Mode 9 Equivalent Resistance TECHNICAL NOTES HORN RELAY UNIT FHR BATT HORN RELAY TERMINAL San HORN RELAY UNIT For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk AC POWER SUPPLY FP 6 SPI 8 01 0 2 10W
49. ED Mounting Printed Board G3304600B 2SC460B 0020270 PB 2027 with LEDs G3305350B 25 535 c 0214 217 301 0109 110 113 117 218 0103 106 108 201 203 210 211 RESISTOR 110306120 Carbon Composition 1W 120 0104 204 205 G3319060 25 1906 110246560 GK 62 0105 206 207 63319070 25 1907 R3 101245471 film 114709 0208 G3324070 28 2407 POTENTIOMETER VRI a Xb with 51 1628000238 DM92R514A 5M2211 10KQ Bx2 PB 2148 20002148 Mounting Printed Board 101 108 202 G2015550 203 C0021480 PB 2148 with components VR1 D1 C412 C413 L403 D111 117 G2090044 Lo 205 211 D110 204 G2090165 Varactor FC52M 5 G2090084 201 SWITCH x SRN 1017 N 5 X101 107 MS 402 BLACK X201 207 X108 0102050 HC 18 U 20 945MHz RECEPTACLE 1090026 50 239 101 102 211282 P0090012 4468 _P1090005 SG 805001 _ cERAMICFILTER 101102 H3900030 LF BIS ith wi 19201950 3021 03 19203270 3021 08 4610 1111 1 CERAMIC DISCRIMINATOR Pay 79203270 3021 08 4625 455 D 19201970 302103 9201990 5417 690900 SDT 1000 69090012 SDT 250 Li 01000041 2 14V60ma x 1 RESISTOR POWER CORD FTC 4610 R237 101245229 Carbon W TJ 2 20 P1090124 Power co
50. For Servioe Manuals MAURITRON SERVICES 8 Cherry Tree Road Chinnor Oxfordshire OX9 407 Tel 01844 351694 Fax 01844 352664 email mauritron dial pipex com MAINTENANCE SERVICE MANUAL 4610 4625 YAESU MUSEN CO LTD BOX 1500 TOKYO JAPAN YAESU ELECTRONICS CORP BOX 49 PARAMOUNT CALIFORNIA 90723 For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor D EX Oxon 9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk Page FOREWORD i SECTION 1 GENERAL GENERAL DESCRIPTION 1 1 PERFORMANCE SPECIFICATIONS 1 2 SEMICONDUCTORS L 1 3 FRONT PANEL CONTROLS AND SWITCHES LLL 1 4 REAR APRON 1 5 OPERATION ai grate 1 6 INSTALLATION o 1 7 INTERCONNECTIONS 1 11 TONE SQUELCH INSTALLATION 1 12 THEFT GUARD INSTALLATION 1 14 SECTION 2 TECHNICAL NOTES BLOCK DIAGRAMS b bobo e oe 2 1 CIRCUIT DESCRIPTION 252 FREQUENCY RELATIONSHIPS CRYSTAL DATA 2222 2 4 HORN RELAY UNIT FHR 1 FP 6
51. OMETER PN822H 203H 8 o CAPACITOR ___ C763 K02179037 Ceramic SOWV 68pF C742 762 K23170004 50 3900pF PER E Mylar 100WV 1040pF PRA1041F 1040pF C712 724 K55209002 2 1500pF Fui C702 711 K55209003 577 PRA7101F 7100pF C713 K55209005 8710pF PRA8711F 8710 725 K55209006 0 28uF REPAIR PARTS C723 Mylar 100WV 0 033 PRA3302F 0 033uF 0 047 uF PRA4702F 0 047 AC CORD T9000580 2 wire 2 prong plug T9000482 3 wire 3 prong plug UL T9000684 3 wire 2 prong EU plug K55209007 K55209008 C721 C701 714 729 K70167105 pF CS15E1V010M as ee 22073 16WV 10uF 11 ee 7 7 143 747 761 515 16 100 781 40129008 Electrolytic 16WV 33uF REGULATOR UNIT 16RE33 Symbol Number Description C715 741 K40129002 16WV 7 PB 2025 F0002025 Printed circuit board 16RE47 C0020250 P C B with components IC amp TRANSISTOR CONNECTOR Q101 G1090036 7089 1090195 3021 05 with wire T9201940 Q102 G3402350Y TR 2SD235 Y P1090186 3021 03 with wire T9201980 m RESISTOR R101 J01245101 Carbon film TJ 1002 R104 101245221 2200 R102 J01245332 oU 3 3 AC POWER SUPPLY R105 J01245103 _ 5 R103 101245123 5 12
52. RVICING FP 5 OUTER COVER REMOVAL 4 M Cp VY 6 OUTER COVER REMOVAL LMM 103 000000272 paMalA ET MEA 220 XR y v 2 innor ASUNT 844 352554 Ch 01 S NE Oa 721 A 2 D d x 4 gt AF Manuals Contact ECHNICAL SERVICES harry Tree Rd gt n CA 8 T lt a 351694 ee 5774 4 Oxon 9 40 enquiries mauritron co uk 01844 il ARITRON T 8c For Serv Tel M3IA 3015 MIIA 01408 o 2 ON ON dw gt 4 jx A t n O N GORGES BBS H 9000 84 019 214 10278 SNOILOANNOO AV I3H 017 E E gt gt m am M ram qs eor SE gt VD W V V V ae d 4 OA UR aO Vie 2 ate Se 26 ne MOS n yw eem dms 0200 XML 4 REE RRP SORT
53. X9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk INSERTION OF PARTS ON CIRCUIT BOARDS All of the below are acceptable ways of inserting components into circuit board mounting holes a Bend leads slightly b Straight in mounting c Vertical mounting d Preformed disc ceramic capacitor A e Preformed resistor diode etc SERVICING BASIC SOLDERING PRACTICE EXAMPLES OF POOR SOLDERING PRACTICE Solder bridge caused by use of too much solder 1 Prepare soldering iron and solder 2 Apply soldering iron to surface to be soldered Cold joint caused by in sufficient heat to part of work resulting in poor solder 3 Apply solder to heated flow surface 4 When enough solder is applied remove solder Continue to apply heat until solder flows cleanly 5 Remove iron from work Do not apply more heat than necessary for good Unstable joint caused by in solder flow sufficient heat or solder Soldering to terminal posts Be certain to apply heat to both post and wire If you have previously lifted a trace make an etch cut on each side of the lifted trace and install a wire bridge as shown in the drawing Lifted Trace Terminal Coat Cut Area With Eastman 910 SERVICING FAULT LOCALIZATION While the process of fault localization is hi
54. amic RH 6pF 2222 636 39508 2222 636 39508 2222 636 39608 C107 K05179008 RH 12pF K05179008 L RH 12pF K05179006 RH 9pF 2222 636 40129 2222 636 40129 2222 636 39908 C136 K05179008 2 RH 12pF K05179008 z RH 12pF K05179008 7 RH 12pF 2222 636 40129 2222 636 40129 2222 636 40129 C140 05179005 e RH 8 K05179003 RH 6pF K05179003 RH 6pF 2222 636 39808 2222 636 39608 2222 636 39608 C144 05179008 RH 12pF K05179005 7 K05179005 z RH 8pF 2222 636 40129 2222 636 39808 2222 636 39808 C145 K05179013 RH 33pF K05179011 RH 22pF K05179011 RH 22pF 2222 637 40339 2222 637 40229 2222 637 40229 C147 05179002 RH SpF K05179001 RH 4pF K05179001 RH 4pF 2222 636 39508 2222 636 39408 2222 636 39408 C222 K05179013 RH 33pF K05179012 RH 27pF K05179012 2 RH 27 2222 637 40339 2222 637 40279 2222 637 40279 227 K05179007 dd RH 10 K05179005 2 RH 8 K05179005 RH 8pF 2222 636 40109 2222 636 39808 2222 636 39808 K02179004 CH 3pF K02179004 4 3pF DD104CH030C50V02 DD104CH030C50V02 C249 K02179003 2pF K02179003 a CH 2pF DD104CK020C50V02 DD104CK020C50V02 C250 K02179004 ti CH 3pF K02179004 re CH 3pF DD104CH030C50V02 DD104CH030C50V02 c K02179004 CH 3pF K02179004 CH 3pF E DD104CH030C50V02 DD104CH030C50V02 K02179003 CH 2pF K02179003 H 2pF DD104CH020C50V02 K02179004 CH 3pF DD104CH030C50V02 c e
55. d All Rights Reserved No portion of this manual may be reproduced in any form without written permission of Yaesu Musen Co Ltd SN aS GENERAL YAESU FTC 4610 FTC 4625 UHF LAND MOBILE TRANSCEIVERS For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01 844 352554 Email enquiries mauritron co uk GENERAL DESCRIPTION 4610 and FTC 4625 are compact high Designed for use in a variety of land mobile appli performance UHF FM transceivers for land mobile cations these transceivers are packaged in rugged applications Fully solid state these transceivers extremely compact cases thus minimizing the provide operation within a 3 MHz TX or 5 MHz chance of damage from shock or vibration The RX range anywhere in the 450 512 MHz land FTC 4610 and FTC 4625 are also fully protected mobile band The transmitter section of the FTC against damage from reversed power supply polar 4610 puts out 10 watts while the FTC 4625 ity and high antenna SWR output is 25 watts The receiver section provides high sensitivity yet excellent rejection of inter The 4610 and 4625 are supplied with modulation and cross modulation products all mounting hardware and cables required for mobile installation GENERAL PERFORMANCE SPECIFICATIONS Frequency range FM noise 7 spot frequencies within a 3 MHz TX or 40 dB
56. e familiar with the operating manual in order to be able to answer questions that may arise The sections to follow are exact reproductions of the corresponding sections of the Owner s Manual They are presented in this format so as to acquaint you with the terminology familiar to the owner HOW TO USE YOUR YAESU FTC 4610 FTC 4625 FM TRANSCEIVER Operation of your YAESU two way radio is extremely straightforward The following section will describe the operating procedure IMPORTANT NOTE Before commencing operation confirm that the power supply connections have been correctly made to rear apron jack and supply Furthermore be certain that a 50 ohm antenna is connected to the antenna jack Never connect AC power to the rear apron POWER jack 1 Check to see that all connections have been made correctly 2 Push the front panel VOL switch to activate the transceiver The front panel PWR lamp will glow green 3 Rotate the squelch control to the point where the background noise is just silenced 4 transmit squeeze the microphone push to talk switch Release the switch for receiver recovery The TX lamp will turn red during transmission 5 The channel selector may be rotated as desired for selection of the desired channel 6 The RESET button is not used unless the optional two tone sequential decoder is instal led TONE SQUELCH OPERATION The optional tone squelch CTCSS unit will provide fo
57. e time it s a good idea to verify that the receiver sensitivi ty and transmitter power output are satisfac tory 2 Channel Modification to a new 3 MHz TX or 5 MHz RX If a new 3 MHz TX or 5 MHz RX range is re quired within the existing 450 470 MHz 470 490 MHz or 490 512 MHz bands proceed as follows a Insert the proper crystals into the sockets appropriate for the channels to be changed 6 Connect the RF probe of a VTVM to the collector of and adjust for maxi mum reading on the VTVM Then detune lio until 80 of the maximum reading provides a stable output c Set the receive crystal to the correct frequen Cy as outlined above 1 b d Connect the RF probe of a VTVM to the base Of Q202 and adjust for maximum reading on the VTVM Then detune T4559 until 80 of the maximum reading provides a stable output e Set the transmit crystals precisely to the correct channel frequency f Align the transceiver strip as described in the ALIGNMENT TRANSMITTER section on page 3 30 For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01 844 352554 Email enquities mauritron co uk BAND TABLE TECHNICAL NOTES 450 470 MHz 470 490 MHz 490 512 MHz Q209 G1090228 57704 01090318 M57704UH G1090319 M57704SH C104 K05179002 Ceramic RH 5pF K05179002 Ceramic RH 5 K05179003 Cer
58. een 5 of and Mic PTT switch Check Check Q301 2 RLso Check TX 8 2V line SERVICING Modulation abnormal Tone squelch of other party won t open no tone squelch signal on your TX Check mic input at end of C251 NG OK Check AF output voltage at collector of Q218 NG OK For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01 844 351 694 Fax 01844 352554 Email enquiries mauritron co uk Check voltage atpin 1 of 4201 NG 8 2V TX Check frequency atpin 3 of J201 NG OK Check voltage at pin 3 of J201 NG OK Check mic mic connector and associated circuit Check 0317 Q 15 Check D0 and associated circuit Check 8 2V line Check Q4 Q82 Check Q42 VRag Check tone signal wave form at base of SERVICING MAINTENANCE AND SERVICING REGULAR MAINTENANCE PLAN Because of the rugged design and construction of the FTC 4610 FTC 4625 little maintenance should be required if the radio is not abused As a Yaesu dealer though you are best in a position to determine the individual needs of your customers Operation in extremely harsh environments may warrant more frequent checks of transceiver performa
59. ery compact units so there is no reason ever to compromise safety during installation For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk GENERAL POWER CONNECTIONS For mobile installation direct connection to the battery is to be preferred If power connections are made at the ignition switch unnecessary noise pickup may occur Also if power is taken from the automobile lighting cigarette lighter or other circuits the circuit line fuse will probably blow because of insuffucient capacity A fuse 4 amp for FTC 4610 10 amp for FTC 4625 is located in the DC power cord for the transceiver protecting that circuit The power connection procedure is detailed below Once the power connections are made but before the power cord is connected to the transceiver you should check the battery charging voltage with the engine running fast enough for the car ammeter to show a charge If the voltage exceeds 15 volts the car voltage regulator must be adjusted to limit the maximum voltage to less than 15 volts CAUTION Permanent damage will result if reversed polarity supply voltage is applied to this transceiver Our warranty does not cover damage caused by reversed power supply connections Also when making power supply connections you must be absolutely certain that the proper supply polarity is observed
60. front panel to the generator so that the distortion meter the 270 degree position then adjust 0 indicates 25 distortion Adjust Tios and just to the position where the squelch opens lios for minimum distortion Now reset the signal generator level for 2546 distortion and again adjust Tios and Tios for minimum distortion Repeat several times 101 102 EN SN da 40 8988 6004 CVio3 Quos 103 T 102 Ti01 TCios TCio9 FTC 4625 RECEIVER SECTION ALIGNMENT POINTS SERVICING ALIGNMENT TRANSMITTER connect the voltmeter to and and adjust Tro and for 2 1 Oscillator Circuit maximum indication on the meter Connect Connect a dummy load UHF wattmeter to the meter to and 7 and the antenna jack Connect the RF probe of adjust and for maximum deflection a to the base of Close the PTT Adjust TC through for maximum switch and adjust T for maximum de indication on the wattmeter flection on the VTVM Now connect a frequency counter to the base of and 2 3 Bandpass Filter Adjustment adjust TC os one for each channel Assemble the test equipment as shown in for exactly the following frequency Figure 7 Adjust Taos Tao and TC TC so that the display shown in Figure 8 is f ftest transmit channel MHz obtained Several passes through the align
61. ghly individualistic it is generally agreed that there is no substitute for a logical step by step diagnostic check Begin your troubleshooting procedure with a visual inspection of the radio Use your nose too burned resistors smell differently than do transformers etc Check for charred or loose components inside the cabinet For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk If the preliminary inspection turns up nothing connect a dummy load to the antenna jack and a 13 8 VDC bench supply to the power cord The supply should be capable 4 amperes continuous for the FTC 4610 and 10 amperes continuous for the FTC 4625 Tum the power switch on and begin a systematic check Do the lamps light up If not check the 15 the trouble not apparent Perhaps it only happens on transmit Check for noises pops sparks or smoke inside the cabinet these are unmistakable declarations by the radio that some thing is awry TYPICAL PART FAILURES CAUSES AND SYMPTOMS PARTS CAUSE OF TROUBLE High supply voltage Semiconductors IC FET TR Open circuit Excessive drive High temperature MOS FET Static electricity MOS IC Shock High temperature Crystal Crystal filter Resistor Potentiometer Variable capacitor Trimmer capacitor Relay Ratings exceeded Humidity E
62. l 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk TONE SQUELCH UNIT The tone squelch unit is comprised of a HPF LPF BPF oscillator and control circuits 1 HPF The output signal from the discriminator is fed through VR to buffer amplifier Qoi MLM2902 and then delivered to the HPF and LPF circuits The HPF consists of four 12 dB oct active filter stages MLM2902 rejects the unwanted CTCSS tones while a buffer stage acts as a switch for the AF amplifier 2 LPF A portion of the output signal from is passed through the LPF consisting of three stages of 12 dB oct active low pass filters which pass only CTCSS tone signals The output signal from the LPF is clipped by Dy and both 151555 for stable operation against the varying input level The clipped CTCSS tone signal is applied to the BPF circuit 3 BPF The BPF circuit which consists of 741 p d MLM2902 is extremely stable The filtered tone signal from the BPF is amplified by and activates the control circuit Frequency setting is accomplished by R 4 and for fine tuning 4 Control circuit On receive the CTCSS tone signal is rectified by 2SC460B and amplified by DC amplifiers Qraa and both 2SC460B The output DC voltage activates the 2SC460B to mute the receiver On transmit switching transistor Q 4 2SC460B conducts to activate the amplifier Q 4 2SC460
63. llator acts in the third overtone mode and the tuned circuits at the emitter Of ensure minimum spurious radiation Feedback capacitors and C204 provide temperature compensation and parts chosen for this position have an N value of at least 750 Frequency adjustment is provided by 04 4 connected in series with the channel crystals Temperature compensation is chiefly provid ed by thermistors and TH plus resistors Regs and which provide a variable voltage in proportion to tempera ture change the control voltage driving varicap diode Do4 FC52M to keep the channel frequency to within 5 ppm over the temperature range 30 to 60 C This specification will be held so long as crystals made to our specifications 8 to 14 ppm at 20 C ref 25 C AT cut 3rd overtone are used The supply voltage for the oscillator is stabilized by which decreases voltage Change caused by variations in temperature SERVICING SOLDERING AND DESOLDERING TECHNIQUE ON PRINTED CIRCUIT BOARDS The FTC 4610 4625 circuit boards are tough but mishandling during soldering can cause circuit traces to lift While this does no permanent damage to the board much servicing trouble can result because of the tendency for this lifted trace to break A few simple precautions will keep your circuit boards in 1 condition 1 Use only 12 to 30 watt chisel tip soldering iron Yes s
64. n of the FP 5 or FP 6 from an improper supply voltage will void all warranties on the set For installation to the FP 5 connect the two pin cord stub connector J4 to the internal connector of the FP S For installation to the FP 6 connect the attached DC cable to rear apron terminals RED cord lead to positive the BLACK lead to the NEGATIVE supply lead Then connect cord stub con nector to power connector J4 of FTC 4610 4625 The four pin socket should not be used the jumper plug sold with the FP 6 must be plugged into the four pin socket so as to provide proper connections However manual on off switching of the FP 6 will be required AC AC AC AC AC 234V 220V 200 HOV Plug in the FP 5 or FP 6 AC cable to the wall outlet Now turn the power supply switch ON and then turn the transceiver power switch ON The radio will now be ready for operation if you have the antenna and microphone connected The FP 5 and FP 6 contain a quality speaker for base station installation Connect the miniature phone plug from the FP 5 or FP 6 to the SP jack on the rear apron of the transceiver CAUTION When performing service on the FP 5 or FP 6 be absolutely certain that the voltage specification on the rear apron matches your local supply voltage Improper connections will void our warranty For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 3516
65. nce We recommend that your customers return their sets to your service facility once every two years for routine checks of the transmitter power output and the receiver sensitivity In the meantime keep in frequent touch with your customers regarding their expanding communications requirements Not only will this give you the opportunity to introduce new Yaesu products but your custom ers particular service requirements will become evident PERFORMANCE CHECKS Make all performance checks at 13 8 volts DC under load Check the transmitter power output as follows a Connect a suitable dummy load wattmeter to the antenna jack b Set the channel selector to any channel Close the push to talk switch and observe the power output For the FTC 4610 the output should be at least 10 watts while the FTC 4625 should provide at least 25 watts output ANT TRANSCEIVER IN LINE WATTMETER Bird 43 or equiv PO TEST SETUP 500 DUMMY LOAD Check the receiver sensitivity as follows a Connect an audio voltmeter to the SP jack and set the squelch control fully counter clockwise b Connect the RF output of a precision UHF signal generator to the antenna jack and note the audio voltmeter reading with no signal present Adjust the volume control and voltmeter range as necessary to obtain roughly a full scale reading Set the signal generator to the recelving frequency of the radio and adjust
66. nnector 3191 0281 R225 229 233 101245100 2 2 2 a Wwe 19013399 21920 124800 7 7 7 7 410 rs 6 301245820 7 7 _ R104 109 110 101245101 7 1000 Si 181555 MC301 t3 on 4090023 with VR1 See CRYSTAL DATA 190064 N4090021 _______ Un gt 5 9 a Jg e g lt lt 5 zi M MAIN UNIT 129 134 205 Description 209 210 238 2106 20002106 Printed Circuit Board 239 2200 2709 3300 3900 5 FTC 4610 C0021060 P C B with Components R213 J01245221 without channel crystal R235 J01245271 C0021061 P C B with Components J01245331 without channel crystal R165 401 402 J01245391 fie Fer TRANSISTOR 4 7 204 101245471 0112 G1090218 315 221 243 0209 61090228 A M57704H RINI 320 59 4700 m oe T 56400 101245541 REPAIR PARTS J01245681 Carbon film 101245102 AW TJ 6802 Carbon Composition GK 33KQ ________________ 822 102 8 822 103 8 VR101 151723103 SRI9R LOKQB CAPACITOR C143 230 237 K08179001 Ceramic
67. olerance resistors are used When the tone frequency is changed the tone squelch activating point must be adjusted as follows Connect the signal generator to the antenna jack and set the output of SSG for 30 dBu 0 5 kHz deviation Reduce the audio input level by 9 dB at the external mod terminal of the signal generator Adjust VR 44 to the point where the tone squelch just opens SERVICING MEMO For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk REPAIR PARTS PARTS LIST AND ORDERING DATA If you live in the United States you may order parts from Yaesu Electronics Corporation In other countries you should order parts from the Yaesu agent for your country In countries where Yaesu is not currently represented you may order spare parts directly from Yaesu Musen Company Ltd in Tokyo When ordering please specify the exact model number of the transceiver that the part is for Many parts are standard such as resistors and disc ceramic capacitors but you should use particular care when ordering such items as electrolytics tantalum capacitors and the like The parts list to follow identifies the board that the parts belong to as well as the circuit designation and part description A Number is also specified and this number will allow immediate identifi cation by our parts departmen
68. ome repairmen have been known to use small blowtorches on cards 2 Use only a soldering iron equipped with a three wire cord with the tip grounded Also acceptable is a soldering iron isolated through a transformer An old soldering iron or gun may have 117 volts on the tip and will certainly cause more damage than it repairs 3 USE ONLY 60 40 ROSIN CORE SOLDER Acid core solder should be thrown away if you find it in your radio shop 4 Use a solder sucker and solder tape to ensure a professional repair job 5 you do lift a trace don t worry Read to find out how to repair traces like a pro NOTES ON USE OF CMOS COMPONENTS As CMOS devices are extremely sensitive to damage from static electricity special precautions must be observed In storage use only a non inductive sponge When installing a CMOS part in a socket or on a circuit board be certain that the power is off In addition the technician should rest his hand on the chassis as the component 1 inserted so as to place his hand at the same level as the chassis better to discharge small amounts of static electricity through your fingers than through a 5 IC When soldering a CMOS part onto a circuit board use a low wattage iron and be sure to ground the tip with a clip lead if the tip is not grounded through a three wire power cord For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon O
69. ormal operation The opening of the squelch causes Q to be activated causing the BUSY lamp to become illuminated TRANSMITTER The speech input signal from the microphone is amplified by and Q2 2SC458B and coupled through to the instantaneous deviation control IDC consisting of D5 and D303 In the 15 amplifier stages the audio is also applied through a pre emphasis network consisting of C Crs2 R247 and C454 The output from the IDC is then fed to a de emphasis network and fed through a low pass filter consisting of L321 5 and The resulting audio signal free of components above 3 kHz is fed to the modulator Crystal oscillator 2SC535B generates a fundamental signal with temperature compensa tion provided by Dio FC52M SDT 250 and SDT 1000 The carrier signal is fed through buffer 25 535 to the phase modulator consisting of MV201 and as sociated circuitry The carrier signal from is varied in phase by the audio signal from Q and the resulting modulated signal is amplified by 2SC535B The frequency multiplier stages consist of 4 25 1906 and 28C1907 the total multiplication factor is 12 The output from 6 is amplified by Qa 28 1907 28 2407 TECHNICAL NOTES M57704H The RF output signal is fed through a low pass filter consisting of L2
70. ose not using tone squelch will occur GENERAL GENERAL INSTALLATION The 4610 4625 are designed primarily for mobile installation requiring only an antenna and 13 8 VDC power source for operation The transceivers have been pretuned at the factory and no adjustment is required for operation into a 50 ohm load For mobile installations three basic factors must be considered These are the antenna system and feedline the physical location of the transceiver and the power connections We will consider each of these individually in the following sections ANTENNA CONSIDERATIONS The FTC 4610 4625 are designed for operation into a 50 ohm antenna system While variations of a few ohms from this figure are of no consequence whatsoever the automatic final amplifier protec tion circuitry will reduce the power output when a high SWR exists on the feedline Preferably the antenna should be located away from the automobile engine if possible in order to avoid unnecessary noise pickup A typical location would be in the center of the car roof or the center of the trunk lid Where ground connections are made they should be scraped clean of all paint and corrosion so as to ensure adequate bonding Lossy ground connections can have seriously detrimental effects on the antenna system im pedance and radiation pattern TRANSCEIVER SWR METER To minimize losses in the antenna system the shortes
71. r silent monitoring of the busy channels See your YAESU dealer for installation of the tone squelch option Your microphone mounting knob and the micro phone hanger form an integral part of the tone squelch system For proper operation the micro phone hanger must be affixed to the automobile metal body Here s how to use the tone squelch system 1 Place the microphone into its hanger This will activate the tone squelch system 2 receiver your radio will remain silent until a call is received from a station using an identical tone squelch system When the correct tone signal is received normal output from the speaker will occur 3 To transmit just remove the microphone from its hanger and call in the normal manner When you squeeze the push to talk switch a subaudible tone one too low for your ear to perceive will sent along with your voice signal This will activate the receiver of the other party in the same way that your receiver responded 4 Note that when a signal is received which does not have a tone squelch signal on it the orange BUSY lamp will light up This will alert you to the fact channel is occupied even though you cannot hear the calling station You should wait until the channel is clear before making a call of your own 5 When you remove the microphone from its hanger the receiver tone squelch system is defeated and normal monitoring of all sta tions on the channel including th
72. rm that the installation does obstruct normal safe operation of the vehicle Route the transceiver power cable through the fire wall to the battery Avoid proximity to ignition cables if at all possible Lay out the power cable so as not to have it interfere with the normal operation of the fan belt or other engine components Connect the RED battery lead to the POSITIVE side of the battery Connect the BLACK lead to the NEGATIVE side of the battery If the optional FSP 1 8 ohms impedance or FSP 2 4 ohms impedance external speaker is to be installed it may be connected to the rear apron SP jack The speaker can then be mounted wherever convenient for the operator Insertion of the speaker plug into the rear apron automatically cuts off the internal speaker of the transceiver FSP 1 FSP 2 EXTERNAL SPEAKER GENERAL BASE STATION INSTALLATION For base station installations the FP 5 for FTC 4610 only and FP 6 both FTC 4610 and 4625 AC power supply options provide a convenient means of providing the required 13 8 VDC for the FTC 4610 FTC 4625 transceivers Before commencing operation with the FP 5 or FP 6 be absolutely certain that the power trans former primary has been wired correctly for the local line voltage in your area Both FP 5 and FP 6 are marketed throughout the world and a unit that you receive from a customer who recently has been abroad may be wired for 234 volts or similar Operatio
73. rolytic 16WV 100uF 108 115 117 45 1 102 16 100 121 125 128 130 133 137 139 141 142 146 148 152 159 161 162 168 170 179 0201 0207 202 205 206 208 210 214 216 219 220 234 236 239 243 252 267 270 272 274 276 279 281 284 285 287 288 290 291 301 362 303 305 401 411 413 193 402 40129006 0 4 16 470 126 127 150 rj gt 4 T1 A gt ry TRIMMER CAPACITOR TC202 203 91000060 ECV 1ZW 02 53 2pF TC204 205 207 K91000059 ECV 1ZW 04x53 7 TC206 K91000028 ECV 1ZW 10x53 7 TC102 109 K91000029 ECV 1ZW 20x53 7 208 214 CVI01 09000079 HRW 231MT 1011A 09000080 HRQ 232MT 1005A CV103 09000081 HRW 231MT 1010A L102 104 105 L0020675 114 208 213 INDUCTOR K10179015 151 157 164 CK45B1H103MY 214 165 167 223 228 229 235 269 273 407 410 L216 217 L0020677 Mylar 50 47 SoF2U102 50177222 7 0 00022 F 1215 11020079A S0F2U222M C187 K50177332 1 7 0 0033 11190038 FL SH 271K 8 50F2U332M L112 113 115 11190017 FL SH 102K 8 C195 50177472 0 0047uF 116 125 202 50F2U472M t gt 403 C182 256 282 0177103 0 01uF L1190102 S 104K 100mH 50220103 L2030060 C173 174 K50176473 fi 0 047uF
74. s 1 Wa 25 4588 940 83756 2 D3 GL S52RG P8 2027 33 8 2 TR 3 C275 It e c1 C280 y 3 0 00 MAURITRON TECHNICAL SERVICES For Service Manuals Contact 4 8 Cherry Tree Rd Chinnor Tel 01844 351 694 Fax 01844 352554 Email enquiries mauritron co uk NOTES 1 ALL RESISTORS IN 21 4W 10 UNLESS OTHERWISE NOTED FTC 4610 CIRCUIT DIAGRAM 2 ALL CAPACITORS IN JF WV 2106 R129 dozz 82 z 2505358 LN AEE 2 ga STe gt SC x 1 ex ye 7 006 5 289 072 3 9 oo o SU N 3 OSP an 0104 25 1906 0103 25 535 0202 o oo FLOM 1 OUT 301 RITZ2 RITR R179 33K Co208 Co24 2 P 76 03 76 09 7 0204 25 1906 9203 0202 0201 20 0 S x 9 CGS uw 4 8 6 S HIRU AEE QT 0729 YEE 7 2 SN lt n e O N SS 8 Da m Mo m O 7 N 55 6920 4 5 oy wee 98C y es S NS 9S n 9824 8422 TP 1124 gt 5 S 3 5224 172
75. st CVi93 for maximum indi scope cation on the VTVM 1 2 Second Local Connect a precision frequency counter through a 20 pF capacitor to the collector of Qios Adjust for a reading of exactly 20 945 MHz on the counter RIPPLE lt 1 dB 1 3 First IF Connect a 21 4 MHz sweep generator to gate 2 of Q02 Connect an XY scope vertical amp input through a diode detector to Fig 6 the secondary of Now adjust Tios and lios SO that the pattern shown in Figure 6 is obtained with less than dB of ripple gt 1 I BOOSTER UNIT BOOSTER CONTROL UNIT Mie Eon 1 MAIN UNIT MAIN UNIT RECEIVER 7 TRANSMITTER SECTION SECTION E FTC 4625 TOP VIEW SERVICING Connect a precision frequency counter to 1 5 RF Section the base of through an 0 01 uF Connect a precision UHF signal generator to capacitor Preset the core of to be the antenna jack and connect an AF milli flush with the top of the shield can Now voltmeter to the speaker jack use 8 ohm adjust through TC one for each termination Inject a signal on the channel channel for the following frequency frequency at a level providing about 10 dB of noise quieting Now adjust 1 103 fest f RX 21 4 MHz for maximum noise quieting as shown on the meter Adjust the signal genera
76. t of the item you require Shipment of parts from Yaesu USA is usually made by UPS COD Allow at least a week for the parts department to process your order You will receive prompt notification that your order has been received and if parts are back ordered or if additional information is required you will be so informed PARTS ORDER EXAMPLE TRANSCEIVER 7 CIRCUIT QUANTITY jDPENTIFICATION LOCATION PART NUMBER DESIGN ATION 4610 2106 4800760 0 6 Note In earlier transceivers no part numbering system was used in the manual For this reason the nomenclature 3SK76 will suffice for the part number All transceivers have a part number for each component cut here YAESU MUSEN COMPANY LTD BOX 1500 TOKYO JAPAN YAESU ELECTRONICS CORPORATION 6851 Walthall Way Paramount CA 90723 YAESU ELECTRONICS CORPORATION 9812 Princeton Glendale Rd Cincinnati OH 45246 ORDER BLANK I authorize shipment via Best Way D Parcel Post UPS O Other Ship To ee 1 Print or Address City State Zip For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk REPAIR PARTS YAESU MUSEN COMPANY LTD C P O BOX 1500 TOKYO JAPAN YAESU ELECTRONICS CORPORATION 36851 Walthall Way Paramount
77. t possible length of coaxial cable should be used For mobile installations type RG 58A U is suitable because of its small size with Teflon dielectric types being better For base stations however larger sizes are to be preferred Base station systems requiring more than 25 feet of coaxial cable should utilize type RG 8A U and extremely long runs of many hundreds of feet generally require the use of type RG 17A U aluminum jacketed foamflex coax air dielectric heliax coax The antenna should be tuned for the center of the 3 MHz working band of the transceiver To check the SWR install a 50 ohm SWR meter between the transceiver antenna jack and the antenna Place the selector switch into the FORWARD position on the meter and transmit briefly make certain that the channel is clear Rotate the FORWARD SET or SWR SET control for a full scale reading Now switch to REFLECTED on the meter and read the SWR If it is below 1 5 you are in good shape If not check below or above the 3 MHz range of the transceiver If the SWR is very high more than 3 1 there may be trouble in the coaxial cable Check the SWR with the meter installed at the antenna or t st the coax by replacement with cable known to be good For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 01844 352554 Email enquiries mauritron co uk SWITCH TO FORWARD SET METER FOR FULL SC
78. tor level and meter scale as needed to provide a meaning We not recommend adjustment of To for ful display frequency compensation because its alignment is extremely critical For Service Manuals Contact MAURITRON TECHNICAL SERVICES 8 Cherry Tree Rd Chinnor Oxon OX9 4QY Tel 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk 101 7 102 E 4 gt M er 0 2203 p 3 um t a w 1 gt 28 ten a gia 2 L E 7 M i FA 1 AN 2 2 i bi be 7 H 1 4 T a 4 A t 8 ao W 4 43 PE A tow 4 L TCin TCi05 1 6 TCio 6 3 105 T 104 T103 102 TCios TCi09 FTC 4610 RECEIVER SECTION ALIGNMENT POINTS SERVICING 1 6 SINAD Sensitivity 1 7 Squelch Adjustment Connect a signal generator set to the channel Connect a signal generator to the ANT frequency with kHz mod 3 kHz receptacle set the deviation to 60 at 1 kHz deviation to the ANT jack Connect an audio and adjust the frequency to the desired chan distortion meter to the speaker jack using nel frequency Set the output to 0 2uV an 8 ohm termination Inject a signal from Rotate the SOL knob on the
79. ure is to be preferred 2 Refer to the interconnection diagram Page 2 5 and hook up the wires as shown The two heavy red wires bare ends with no con nector should be wired in parallel with the main steering wheel horn switch of the car The three leads from the molded connector are connected as follows the white lead goes to the FTC 4610 4625 HORN RELAY terminal Figures 3 and 4 the red lead goes to an auxiliary post on the fuse block if one is available 10 amp fuse is OK the black lead goes to ground 3 Inside the FHR 1 are two miniature potentiometers shown in Figure 5 controls the ON time of the beeping horn while VRio2 controls the OFF time Either control provides an adjustment range of 2 to 25 seconds in the on and off times 4 The customer should be educated in the importance of being able to turn off the horn relay quickly so as to minimize the disturbance to others Also discuss with the customer the importance of maintaining good connections to the HORN RELAY jack etc so as not to induce false triggering of the 0 52 3mm scre Figure 2 4625 Figure 3 ds Remove screw from rear panel FTC 4610 Figure 4 Figure 5 TECHNICAL NOTES BLOCK DIAGRAM 37 500 75 50000 4 450 0 OSTEN 42 667 Mnt 4 95 33 27066700 512 COOMHz o 4 4 0204 220 9202 pet
80. us reduction at antenna jack Spurious radiation from the antenna terminal is suppressed by 1 a low pass filter con sisting Of Lyig C289 C246 L217 C247 Cras and pi configuration for harmonic reduction of better than 60 dB 2 Troe C223 T207 C224 C225 C226 T208 C227 C230 C231 C232 L os C244 TC202 C237 L207 and C338 which attenuate non harmonic spurious more than 60 dB Spurious radiation from the case power cable etc The following capacitors ensure maximum attenuation of spurious signals from the case power cable and other areas C216 C220 C229 Casa Coss C241 C242 C243 Ci42 Crag and Ciso Coils are sealed where they could cause spurious radiation Deviation circuit The Instantaneous Deviation Control Circuit IDC consists of D202 D203 R248 R249 and R250 which control the deviation level Power control circuitry The Automatic Power Control APC circuitry consists of Q210 R275 VR202 d 0 Q214 and Q213 provides precise setting of the output power Audio filtering An audio filter consisting of L5 C455 and C260 provides attenuation of audio frequen cies above 3 kHz of 18 dB octave referenced to kHz The filter is of the constant k type Frequency stability adjustment channel selec tion Diode switches D D select crystals X201 207 thus providing for channel selec tion lhe osci
81. will glow red during transmission TX and green during standby with DC power applied PWR YM 30 MICROPHONE 6 BUSY CONNECTIONS This indicator will light up when a signal is received one strong enough to break the receiver squelch GENERAL REAR APRON CONNECTIONS For Service Manuals Contact MAURITEON TECHNICAL SERVICES 8 Cherry Trae Chinnor Oxon CX9 4QY 01844 351694 Fax 01844 352554 Email enquiries mauritron co uk ANTENNA POWER CORD EXTERNAL SPEAKER JACK 1 POWER 3 ANTENNA Connect the main DC power cord to this cord stub connector Do not apply AC power to this transceiver at any time 2 SP This is a miniature phone jack for connection to an external 4 ohm or 8 ohm speaker This is a UHF connector for connection to the station antenna The antenna impedance should be 50 ohms WARNING DO NOT CONNECT AC POWER TO THE DC POWER RECEPTACLE REPLACE FUSES ONLY WITH 10 AMP FUSE FTC4610A 4 AMP FUSE FAILURE TO OBSERVE THESE WARNINGS WILL VOID THE WARRANTY BATTERY FUSE HOLDER TERMINALS POWER CORD RED K ANTENNA JACK 1 BENE 14 6 TRANSCEIVER SOLDER FUSE BLACK BLACK P6 POWER CORD DIAGRAM 40 cy Speaker Plug OPERATION GENERAL Included with each transceiver is an OPERATION MANUAL which presents basic operating instruc tions in an easy to understand format The service technician should becom
82. xcessive power Aging High temperature Excessive power Shock Excess voltage High temperature Excess power Ratings exceeded Ratings exceeded Variation Ratings exceeded Aging Dust between plates Shock forced rotation SYMPTOMS Short or open circuit Output decreases to 1 2 at 80 C Internal noise Instability Total failure Crystal destroyed Frequency drift Filter bandpass change Component burned Value changed Open circuit Component burned Open circuit Noise Unsmooth rotation Shorted Leakage Open decreased capacitance Shorted Leakage Unsmooth rotation Open or short circuit Leakage or shorted turns Detuned Poor contact Unsmooth operation Open circuit Poor contact Noise Coil onen TROUBLESHOOTING RECEIVER POWER switch OFF check for short between power socket terminals Power switch off fuse blows Shorted Open Set POWER switch ON check for short Shorted between power socket terminals OK Check voltage at pin 6 of Q401 No signal received NG 8 2V Check voltage at pin 11 of NG 13 6V Check local level at gate 2 of Q102 Check RF level at base of Q194 NG NG Poor sensitivity 0 4V OK Check RF level at base of 105
83. z signal of 5 5 mV at If the deviation changes during this alignment the mic jack Adjust VR for a deviation adjust it again Several passes may be neces of 4 9 kHz Now reduce the AF generator sary level so that the deviation reaches 3 kHz Adjust T293 and for minimum distortion XCVR AUDIO SIGNAL GENERATOR 6 dB HYBRID DUMMY LOAD 4 WATTMETER 1 2 5 5 mV LINEAR DETECTOR DISTORTION METER Fig 9 2 5 TEST SETUP RL 201 V P o T 204 2 T207 T 203 T 206 T202 2 2 T 201 T 205 201 t 5 58 5 5 000965565 FEF FEP gt CTO Ain A RI ICRA ARE SEH Ap 4 1 MCI SERVICING 2 6 RF Power Adjustment With the dummy load wattmeter connected to the antenna jack adjust VR for 10 watts 4610 25W 4625 output 2 7 AFP CIRCUIT 4625 Connect the dummy load wattmeter to the antenna connector Connect the voltmeter C503 lead to the cathode of Ds 3 connection of 2 22 Adjust for minimum deflection on the Hi 27 meter Rotate slowly clockwise from the fully counterclockwise position the output power will cut off and note that point Then rotate counterclockwise 2 3 into the cut off point VR202 T P206

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