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TCB-550 service manual(081002)

1. 2 147 PART 4060005000 SPRING 6X0 8X5T RO 225UHFINE SPRING 6X0 8X5T R 0 225UH FINE 149 PART 410 0271 000 IFTCOIL27MHZ BRX1FINE eee COIL 27MHZ B RX1 FINE 155 PART 4250150000 50 000 COIL AXIAL 1 5UH AL0305 MATSUTA sss AXIAL 1 5UH AL0305 MATSUTA m 157 PART 425 R390 000 AXIAL 0 39UH AL0305 MATSUTA AXIAL 0 39UH ALO305 MEM 165 PART 702 C5500 50A TX SHIELD CAN 1 SPTE 0 3T 166 PART 702 C5500 60A SHIELD CAN 2 SPTEO 3T 167 PART 702 7700 80 SHIELD CAN SPTE 0 3T DESHAN A 170 PART 540 0215 000 WIRE HARNESS PH 2PIN TO OPEN UL 1007 026 L150mm 171 PART 702 C5500 10A COVER SPC BLACK COATING 0 8 172 PART 702 C5500 20A UPPER COVER SPC BLACK COATING 0 8t 173 PART 702 C7700 30A SPK EGI 1 0T COATING DESHAN 174 706 3008T BBH SCREW MACH 3X8L TAPTITE BLACK BH 164 PART 570 5001 000 R16100NS KA20D11 5 A503 000 G74 CTR 175 PART 715 C650N 001 SPK D65X0 3T BLACK ASSY 700 C550C A00 COVER ASSY TCB550 176 PART 715 RO00D 024 FELT COVER 6x117x0 2t BLACK ONE SIDE DOUBLE TAPE 177 PART 718 R000D 001 CUSHION 20X24X4 0T EVA SPONGE BLACK 178 ASSY 700 C550E A00 2 ESCUTCHEON ASSY TCB550 179 PART 541 0400 000 CONNECTOR SOCKET FD MIC4PIN F NINGBO 180 PART 701 C5500 10A WINDOW ACRYL CLEAR SOLARIUM 181 PART 701 5500 20 ESCUTCHEON ABS BLACK S
2. l lt 2 lt 2 o REMARK 1 Upper cover CSC 0 86 Black 1 2 Bottom cover Back 1 2 Monbody CE CC Bracket Set SPC 1 6t Block Key Main PCB Ch knob gt rr gt Block BS Block Nut for connector Washer for Mic connector Ring nut oO BsHm Ni plating Escutcheen ABS Block tapetWin 9 161 14 Wndow 0 0 JjAey Cleor 15 EVA SPONGE A 12 16 JEVASPONSE B 16520X059 2 17 LED Brocket 09750011 LCD Reflector Acryl Tt DOUBLE SIDE TAPE 29X4 5X0 21 2 Oiffuser Lens 0 1 WHITE SHEET POLYESTER Olt 1 Zebra Silicone 1 Key pad Silicone PU coating 1 Stud bolt JABS BsBm 11 Packing rubber 12 Ant terminal SPIE DA Felt Caver f6x117x0 2t 4 Cushion EVA sponge 1 TX shield can 2 SPTE 6 1 1 a x 5 9 9 N gt a kar Shield caver SPTE 0 31 1 Speaker o c CN Felt Spk 65 x 9 351 1 Mic connector 4PIN TX shield ean 1 0 21 1 5 VCO shield SPTE 0 8 Bracket Spk 1 0t Cord stopper Block 1 Washer far Ant cannector 11
3. 27 405 MHz CH 40 RF Power Output AM FM 4 0 Watts DC Input Voltage and Current With 13 2V DC Input to Power AMP Transmitter Power VOLTAGE 12 5 V Current 820mA Transmitter DRIVER AMP VOLTAGE 12 5 V Current 130mA RECEIVER IF AND LOCAL OSCILLATOR FREQUENCIES FIRST IF 10 695 MHz SECOND IF 455 KHz FIRST LOCAL OSCILLATOR 10 965 MHz Below RECEIVING FREQUENCY SECOND LOCAL OSCILLATOR 10 240 MHz 2 3 SEMICONDUCTORS AND FUNCTION REF NO 081 DESCRIPTION REMARK KEC MANUFACTURER INFORMATION KOREA ELECTRONICS SEMICONDUCTOR CO LTD TOSHIBA SEMICONDUCTOR CO LTD K E C TOSHIBA SANYO SGS KTC4080E RF AMP X QR2 KTC4080E 156 MIXER X KEC QR3 KTC4080E 156 MIXER X KEC QR4 KTC4075E RF ATTENUATOR RF ATTENUATOR KEC QRS KTC4080E IF AMP X KEC QR6 KTC4080E IF AMP X KEC QR7 KRA2014E A N L X KEC 001 KRC410E SQ MUTE X KEC QQ2 KTC4075E RF ARRENUATOR RF ATTENUATOR KEC QQ4 KRC402E AUTO SQ S W X KEC QASI KRC410E FM MUTE X KEC QAS2 KRA305E AM B X KEC QAS3 KRC402E AM B CONTROL X KEC QAS4 KRC410E X AM AUDIO PATH KEC QFS1 KRC402E X FM AUDIO S W KEC QFS2 KRC410E POP MUTE X KEC QUSI KRC404E SQ CONTROL X KEC QRS1 KTC4075E RX B X KEC 0 51 KTA2014E X TX Bt KEC 1658 x TX POWER REGULATOR KEC QG2 KT
4. 0603 470PF NPO 50V 5 PHILIPS 1 00 100 PART 212 472B 6K0 CHIP CERAMIC CAP 0603 0 0047UF X7R 50V 10 PHILIP 2 00 101 PART 212 473B 3K0 CHIP CERAMIC CAP 0603 0 047UF X7R 16V 10 PHILIP 4 00 102 PART 212 560C 6J0 CERAMIC CAP 0603 56PF NPO 50V 5 PHILIPS 2 00 103 PART 212 561C 6J0 CERAMIC 0603 560PF NPO 50V 5 PHILIPS 1 00 104 PART 22D 151C J00 0188 CAP CC1HCH151J Label 50VCH151J SAMIL 1 00 1105 PART 22D 334C J00 DISK CAP CC1HSL331J Label 50VSL331J SAMIL CAP CC1HSL331J Label m 106 PART 220 471 00 DISK CAP CC1HSL471J Label 50VSL471J SAMIL CAP CC1HSL471J Label 50VS 117 PART 3022314000 TR 25 2314 SANYO 0 25 2314 SANYO oan 118 PART 3050305000 CHIP TR SWITCHING TR SWITCHING KRA305E KEC 119 PART 305 0401 000 TR KRC401EKEC TR KRC401E KEC e 120 PART 3050402000 CHIP TR SWITCHING KRC402E TR SWITCHING KRC402E KEC 133 PART 342 0121 B00 DIODE SWITCHING KDS121EKEC DIODE SWITCHING KDS121 136 PART 3431060000 DIODETN6O 1N60 137 PART 343 4004 000 DIODE 1N4004TR 400V 1A 1N4004TR 400V 1A 141 PART 373 4551 500 CERAMIC FILTER LT455HTW DTRON FILTER LT455HTW DTRON 143 PART 4000024000 TRANSFORMER EI 24 MOD 2 FINE
5. Harmonic Unit TX condition Adjustment LT11 5 of the UUT PTT on 1 Carrier Level by spectrum LT12 TT lt m Adjustment Others Don t care Senter Prequoncy LT13 Spec 33 35dBm LT14 2 2nd Harmonic by spectrum Center Frequency 54 37 MHz Spec lt 86 dBm Frequency Counter Power ANT Connector 2 Power Meter upply Figure 2 DC Power RF Power Supply Meter Modulation Meter ANT Connector Figure 3 30dB ATT Figure 4 5 3 Receiver Section Alignment 5 3 1 Required Test Equipment If uses in HP8920 the 1 4 equipment is not a necessity 1 Standard Signal Generator SSG 5 Oscilloscope 2 SINAD Meter 6 DC power supply 13 2V 3A 3 AC Level Meter 7 8 ohm Dummy Load 4 Distortion Meter 5 3 2 Alignment procedure Alignment Step Test Item UUT setting Equipment setting ins Spec poin AM Channel CH19 Connect the equipment and Audio Level Audio output Function UUT as shown on Figure 5 L1 gt 5V at maximum Adjustment 1 mode 2 SSG setting L2 unit s volume NS 27 185 13 Distortion Unit RX condition Freq 27 z lt 5 at 2V audio 1 Volume Optional 2 AF 1KHz LR3 level need unit s Squelch Minimum 3 RF level 47dBm LR4 volume adj to get Others Don t care 4 Modulation 30 2V audio level Alignment Step
6. Output Frequency Doublers Output Frequency Transmit CH 1 13 4825 MHz 26 965 MHz Transmit CH 40 13 7025 MHz 27 405 MHz Since all frequencies are obtained from the crystal controlled PLL oscillator all outputs are coherent with the crystal oscillator frequency and matching the same percentage accuracy Channel Frequency MHz Program Data amp Frequency Table 1 1 13 4825 2 13 4875 3 13 4925 4 13 5025 5 13 5075 6 13 5125 7 27 035 3268 16 34 5407 13 5175 8 27 055 3272 16 36 5411 13 5275 9 27 065 3274 16 37 5413 13 5325 10 27 075 3276 16 38 5415 13 5375 11 27 085 3278 16 39 5417 13 5425 12 27 105 3282 16 41 5421 13 5525 13 5575 13 5625 13 5675 16 27 155 3292 16 46 5431 13 5775 17 27 165 3294 16 47 5433 13 5825 18 27 175 3296 16 48 5435 13 5875 19 27 185 3298 16 49 5437 13 5925 20 27 205 3302 16 51 5441 13 6025 21 27 215 3304 16 52 5443 13 6075 22 27 225 3306 16 53 5445 13 6125 23 27 255 3312 16 56 5451 13 6275 24 27 235 3308 16 54 5447 13 6175 25 27 245 3310 10 55 5449 13 6225 26 27 265 3314 16 57 5453 13 6325 27 27 275 3316 16 58 5455 13 6375 28 27 285 3318 16 59 5457 13 6425 29 27 295 3320 16 60 5459 13 6475 30 27 305 3322 16 61 5461 13 6525 31 27 315 3324 16 62 5463 13 6575 32 27 325 3326 16 63 5465 13 6625 33 27 335 3328 16 64 5467 13 6675 34 27 345 3330 16 65 546
7. provided first local frequencies QR2 3 mixes the incoming signal to generate first IF signal Mixed signals were filteres with the CF1 10 695MHz crystal filter and tuned circuits With the 10 24MHz signal IC1 FM IF IC converts the incoming signals to generate second IF signal 2 nd IF is filtered by a razor sharp seramic filter CF3 coulpled The 455KHz signals from the 2nd IF filter were amplified and limits inernally After amplification the signals fed to the quadrature detector loop LR5 Than could see the recovered sifnals PIN 9 of ICI AM signals form the PIN 5 of IC1 were tapped with CR34 and amplified two stage amplifier QR5 6 is a a first 455K Hz amplifier DR3 is a detector diode witch produce audio signal as well as negative DC voltage fir AGC action The negative voltage laso provides forward biasing to the mitter of ANL clipping TR QR7 The biasing voltage has a time constant determined RR44 and CR54 Therefore any sharp negative going pulse from DR3 will back bias QR7 and clipped The way to recover the AM information audio is envelope detector Test Equipment Setup and Alignment Instructions 5 1 VCO voltage adjustment 5 1 1 Required Test Equipment 1 DC power supply 13 8VDC 3A 2 DC Voltmeter or Oscilloscope 3 RF attenuator 30dB 5 1 2 Alignment Procedure Alignment Step Test Item UUT setting Equipment setting Spec poin RX VCO voltage Channel CH1 Measure the DC voltage 1 Adjustment U
8. 06 3008T BBH _ SCREW 3X8L TAPTITE BLACK BH 211 PART 708 50121 ZTH SCREW 5 121 15 ZN PLATING TH 212 PART 714 M30NI 001 STAR WASHER S M3 NI PLATING B TYPE 206 207 208 209 197 PART 706 3008T BBH SCREW MACH 3X8L TAPTITE BLACK BH 200 PART 713 M30NI S01 SPRING WASHER PART 719 RO00D 040 CU TAPE 1 COPPER CU 41 7X9X0 1T 1 SIDE DOUBLE TAPE PART 719 RO00D 041 TAPE 2 COPPER CU 63 5X15X0 1T 1SIDE DOUBLE TAPE PART 714 M5ONI 002 STAR WASHER L 5 NI PLATING B 214 PART 801 C550 001 GIFTBOX REV 01 215 PART 804 C550 A01 BOX A SWIE 2 0 BROWN REV 01 216 PART 804 C550 B02 INNER BOX SW1E 2 0T BROWN REV 02 217 PART 807 C550 001 PAD FOR INNER BOX A REV 01 218 PART 809 C550 001 OUT BOX DWIE 7 0T REV 01 219 PART 817 0520 000 POLYBAG PE 50X200 220 PART 817 0810 000 POLYBAG PE 80X100 221 PART 817 2230 000 8 PE 220X300 222 PART 820 C550 001 OWNERS MANUAL REV 01 223 PART 830 C550 001 LABEL REV 01 0 2T 35X20mm 224 PART 833 C550 000 CODE 39 SERIAL NO STICKER 20X25mm 225 PART 834 0001 000 WARNING LABEL 226 PART 834 0002 000 ROHS STICKER TTI 227 PART 836 C550 000 PROTECTIVE SHEET 228 PART 837 0001 000 OPP TAPE 50MM TTI LOGO 229 PART 838 0001 000 YELLOW STRAP 280 PART 83A 0001 000 GEL 19 231 PART 905 C550 000 MICROPHONE ASSY TCB550 8 88 Zi a LU 0 0 lt
9. 202 4779 00 ELECT CAP 470UF KR1 25V471MA 10x15 DONGXIANG 1 00 82 PART 212 050C 6CO CHIP CERAMIC CAP 0603 NPO 50V 0 25 PHILIPS 1 00 83 PART 212 080C 6CO CERAMIC CAP 0603 8PF NPO 50V 0 25 PHILIPS 1 00 84 PART 212 100C 6J0 CERAMIC 0603 10PF NPO 50V 5 PHILIPS 4 00 85 PART 212 101C 6 0 CERAMIC CAP 0603 100PF NPO 50V 5 PHILIPS 11 00 PART 212 102B 3K0 CHIP CERAMIC CAP 0603 0 001UF X7R 16V 10 PHILIPS 5 00 87 PART 212 103B 3K0 CHIP CERAMIC CAP 0603 0 01UF X7R 16V 10 PHILIPS 26 00 88 PART 212 104B 3K0 CHIP CERAMIC CAP 0603 0 1UF X7R 16V 4 10 PHILIPS 15 00 PART 212 105F 3Z0 CHIP CERAMIC 0603 1UF Y5V 16V 20 80 PHILIPS 5 00 PART 212 150C 6J0 CERAMIC CAP 0603 15PF NPO 50V 5 PHILIPS 1 00 91 PART 212 151C 6J0 CERAMIC CAP 0603 150PF NPO 50V 5 PHILIPS 4 00 92 PART 212 153B 3K0 CHIP CERAMIC CAP 0603 0 015UF X7R 16V 10 PHILIPS 1 00 93 PART 212 180C 6J0 CERAMIC CAP 0603 18PF NPO 50V 5 PHILIPS 1 00 94 PART 212 181C 6J0 CERAMIC CAP 0603 180PF NPO 50V 5 PHILIPS 1 00 95 PART 212 221C 6 0 CERAMIC CAP 0603 220PF NPO 50V 5 PHILIPS 1 00 PART 212 270C 6J0 CERAMIC CAP 0603 27PF NPO 50V 5 PHILIPS 1 00 97 PART 212 390C 6J0 CERAMIC 0603 NPO 50V 5 PHILIPS 1 00 PART 212 470C 6J0 CERAMIC 0603 47PF NPO 50V 5 PHILIPS 5 00 PART 212 471C 6J0 CERAMIC CAP
10. 686A SANTECH PART 363 0800 000 CRYSTAL 8 0MHZ 495 8 000 20 30 SHOULDER 24 PART 500 5504 000 LCD PCB TCB550 1 00 PART 722 R0000 001 SHEET POLYESTER 0 1T ASSY 5A0 5504 100 ASS Y TCB550 PART 102 100J S00 RES 100HM 0 5W 5 ST PART 102 229J S00 FILM RES 2 20HM 0 5W 5 ST gt gt 25 25 2 28 2 EJ 25 EJ En 6 E 46 Ed 6 6 50 51 PART 1422224000 RES 0603 2 2 5 PHILIPS PHILIPS 52 PART 142223 000 42 223J 000 CHIP RES 0603 22KOHM 5 PHILIPS RES 0603 22KOHM 4 5 P 53 PART 1422244000 RES 0603 220 5 PHILIPS RES 0603 220KOHM 5 PHILIPS m 54 PART 2 14222 4000 CHIP RES 0603 2 2MOHM 5 PHILIPS RES 0603 2 2 5 PHILIPS T PART 2 142 821 000 42 821 J 000 RES 0603 8200HM 5PHILIPS RES 0603 820 5 PHILIPS ILC m 75 PART 202 1069 00 069 00 ELECT 10UF KR1 16V100MA 5x11 DONGXIANG CAP 10UF KR1 16V100MA 5x11 DONGXIANG 76 PART 202 108 00 ELECT CAP 1000UF KR1 16V102MF 10 20 DONGXIANG CAP 1000UF KR1 16V102MF 10x20 E PART 202 2279 00 220UF KR1 16V221MB 5x11 DONGXIANG 79 PART 202 4749 00 ELECT 0 47UF KR1 16V47MA 5x11 DONGXIANG 1 00 PART 202 4769 00 ELECT CAP 47UF KR1 16V470MA 5x11 DONGXIANG 2 00 81 PART
11. 9 13 6725 35 27 355 3332 16 66 5471 13 6775 36 27 365 3334 16 67 5473 13 6825 37 27 375 3336 16 68 5475 13 6875 38 27 385 3338 16 69 5477 13 6925 39 27 395 3340 16 70 5479 13 6975 13 7025 4 3 Description Of Each Block 4 3 1 Introduction The synthesizer is implemented with the following companents PLL IC IC6 X TAL X2 VARICAP DIODE DV1 2 IC6 is a CMOS LSI that includes most of PLL block The VCO with varicap diode DV1 2 as a part of the oscillator tank circuit QV2 is a switching transistor to connect or disconnect the tunning capacitor in the VCO oscillator tank circuit for transmitter or receiver 4 3 2 Reference frequency The crystal X2 10 24MHz and other components at PIN 1 and 24 of IC6 can make a reference frequency oscillator with internal amplifier The oscillator output is internally fed to a divied by 4096 to produce A 2 5KHz swuare wave witch is the reference input to the phase detector 4 3 3 VCO is connected as a hartley type oscillator with varicap diode as part of the tank circuit With Appropriate control voltage on D601 the VCO can be oscillate over the required range of 13 4825MHz to 16 710 MHz 4 3 4 Programmable divider and its control The programmable inputs for each channel are set by the PLL clock PIN34 DATA PIN35 Enable PIN33 of ICS Each input signal to control the PLL IC is done with the provided key input PIN 12 15 For each key input an intern
12. A2014E X TX POWER REGULATOR KEC QG3 KRC401E X TX POWER REGULATOR KEC QG4 KTC3875S MAIN REGULATOR MAIN REGULATOR KEC 065 KTC3875S CPU REGULATOR CPU REGULATOR KEC KRC402E X POWER HI LOW S W KEC QVI KTC4080E Qwi KTC4080E X BUFFER KEC QW2 KTC4080E X DOUBLER KEC QNI KRC401E X TX ENABLE KEC QN2 KRA305E X TX ENABLE B KEC QT2 KTC4080 X BUFFER KEC QT3 28C2314 X DRIVER SANYO QT4 25 2078 X POWER AMP SANYO Q1 2265 LCD BACK LIT LCD BACK LIT KEC Q2 KRC401E LCD BACK LIT LCD BACK LIT KEC Q3 KRC404E CPU RESET CPU RESET KEC 0815019 FM 1F X AUK IC2 KIA358F SQ CONTROL X KEC TDA2003 X TX AM AUDIO AMP SGS 4 24WCO2J EEPROM EEPROM HOLTEK IC5 TMP86FM29UG CPU CPU TOSHIBA IC6 LC7152 PLL PLL SANYO IC7 KIA358F X TX FM AUDIO AMP KEC JAPAN SANYO SEMICONDUCTOR CO LTD SGS THOMSON SEMICONDUCTOR CO LTD 4 Description of Frequency Determining and Stabilizing Circuitry 4 1 Introduction The Frequencies for transmitter and receiver first local frequencies are all derived from a signal 10 695MHz crystal and second local frequencies are derived from 10 240 MHz crystal by means of a Phase Icoked loop The first local oscillator frequencies are 16 270MHz CH1 to 16 710MHz CH40 The second local frequency is fixed at 10 240MHz to generate second IF 455K Hz Transmit the VCO of the PLL operates 13 4825MHz CH1 to 13 7025MHz 40CH The VCO frequency goes to the doublers circuit DW2 LT1 LT2 whi
13. GRAM CF1 10 695MHz 002 ATT AGC AM MODULATION 0175 DRIVE AMP TX FINAL AMP FM DBL5019 2nd AMP QRS QR6 AM IF AMP RX TX B POWER REG CPU 4 EMG UP DOWN AM FM PTT DM BRT a 92 DM BRT S W SECTION7 SCHEMATIC
14. OLARIUM 182 PART 701 7700 50 KNOB ABS BLACK COLOR 183 PART 703 5500 10 PAD SILICONE NATURAL PU coating 184 PART 706 26048 SCREW MACH M2 6x4L BLACK FH 185 PART 706 2605S NFH SCREW M2 6X5L Ni PLATED 169 PART 520 6600 000 SPEAKER 66mm 66 0 4 11 ASAHI 163 PART 570 1001 000 VR R16100NS KA20D11 5 B103 000 G74 CTR 186 PART 708 26082 BPH SCREW TAP 2 6X8L 2S BLACK PH HEAD DIA 4 2 187 PART 712 70 001 NUT BsBm 188 PART 719 8000D 035 DOUBLE TAPE WINDOW 0 16t 189 ASSY 700 C550M B00 BODY ASSY 550 190 PART 541 0239 002 FD ANT 1 NINGBO 191 543 2000 000 CORD ASS Y UL1015 20AWG 2A FUSE BOX BSQ 192 PART 701 C5500 70A CORD STOPPER PP BLACK SOLARIUM 193 PART 701 C5500 80A NYLON66 GRASS 15 SOLARIUM 195 PART 702 C5500 70A SHIELD COVER SPTE 0 3T 196 PART 702 C7701 30A ANT TERMINAL SPTE 0 2T 198 PART 706 3010S BBH SCREW M3X10L BLACK BH 199 PART 711 M30NI 000 NUT Ni PLATED 166 187 168 169 190 191 192 193 195 196 197 198 199 1 PART 701 C5500 90A STUD BOLT ABS M6X8L BLACK SOLARIUM 20 20 20 0 4 PART 723 C7700 001 0 6T 8A0 C550 000 PACKING ASS Y 550 PART 702 C7701 10A MIC SUS304 1 0 0 PART 703 7700 55 PACKING RUBBER 210 PART 7
15. Test Item UUT setting Equipment setting Spec poin RX sensitivity Same as step 1 SSG setting 107dBM 2 1 RF level 107dBm at 10dB SINAD 2 Others same as step 1 if not align again FM Channel CH19 Connect the equipment and Audio Level Audio output Function UUT as shown on Figure 5 25V at maximum Adjustment unit s volume 1 FM mode 2 CB ina SSG setting Distortion Unit RX condition 1 Freq 27 185MHz lt 5 at 2V audio Volume Optional 2 AF 1KHz LR5 level need unit s Squelch Minimum 3 RF level 47dBm volume adj to get Others Don t care 4 Modulation 1 5KHz 2V audio level RX sensitivity Same as step 3 SSG setting 107dBm 4 1 RF level 107dBm at 2008 S N 2 Others same as step 3 if not align again TIGHT Channel CH19 Connect the equipment and Adjust until Squelch Function UUT as shown on Figure 5 audio signal Adjustment 1 FM mode 2 CB SSG setting on the scope Unit RX condition 1 Freq 27 185MHz Volume Don t care 2 AF 1KHz RVQ1 Squelch Maximum 3 RF level 47dBm Others Don t care 4 Modulation 1 5KHz Adjustment 1 adjust RVQ1 AUTO Channel CH19 Connect the equipment and Adjust until Squelch Function as shown on Figure 5 audio signal Adjustment 1 FM mode is appeared 2 CB SSG setting on the scope 1 Freq 27 185MHz Unit RX condition 8 Volume Don t care RVQ2 Squelch VR OFF Others Don t care Adi
16. UT RX condition on the VCO test point LV1 16 21 Others Don t care VDC TX VCO voltage Channel CH1 Measure the DC voltage 2 Adjustment UUT TX condition on the VCO test point LV1 1 5 2 5 Others Don t care VDC 5 3 Equipment connection DC Voltmeter amp Oscilloscope DC Power Supply Figure 1 5 2 Transmitter Section Alignment 5 2 1 Required Test Equipment If uses in HP8920 the 1 7 equipment is not a necessity 1 RF Power Meter 2 50 ohm Load non inductive 3 RF attenuator 30dB 4 Audio Generator 5 Modulation meter 5 2 2 Alignment procedure 6 Frequency counter 7 DC Voltmeter 8 Spectrum analyzer 9 DC power supply 13 8VDC 3A 10 Oscilloscope Others Don t care 1 Adjust RVM1 to obtain 85 modulation Alignment Step Test UUT setting Equipment setting Spec poin TX Channel CH19 Connect the equipment and Frequency Function UUT as shown on Figure 2 Adjustment 1 AM or FM mode 27 185MHz 1 2 CB CTX1 300Hz Unit TX condition MIC PTT on Others Don t care TX Channel CH19 Connect the equipment and Max 4W Power Function UUT as shown on Figure 3 Adjustment 1 AM or FM mode LT1 If cannot 2 DC power supply 15 6V LT2 get a power Unit TX condition up to 4W MIC PTT on adjust VR3 Others Don t care AM Modulation Channel CH19 Connect the equipment and Adjustmen
17. al code convert EEPROM provides the appropriate control to the programmable divider for that channel Since the change transmit and receive and additional BIT is required ar PIN 16 of IC5 to allow the ROM to recognize the status TX or RX During transmit the push to talk switch grounds PIN 16 thru diode DS1 which is the transmit status Thr programmable divider output is fed to the phase detector for comparison with the 2 5KHz reference See TABLE 1 for actual input and divide ratio on all channels 4 3 5 Phase Detector and VCO control The phase detector is a digital phase comparator which compares the phase of the reference woth programmable divider output square waves and develops a series of pulses whose DC level depends on the phase error of each signal The phase detector pulse output is fed to an active low pass filter and RC LPF ouput signal of IC6 is filtered and fed to varicap DV1 2 control the VCO frequency 4 3 6 Transmitter Receiver Buffer AMP The VCO output is fed into buffer AMP from the capacitor of 4 3 7 Transmitter Doubler The output signal of QW1 goes to an amplifier tuning circuit 27MHz QW2 LT1 LT2 which doubles incoming 13MHz signals 4 3 8 Switching of tuning capacitor in VCO The VCO circuit must turn with a wide range of frequencies 13 4825MHz 13 7025 MHz for transmitter and 16 27MHz 16 710 MHz for receiver The use of one tuning capacitor in common has adverse effects as a de
18. ch doubles the frequency to generate 26 965MHz CH 1 to 27 405MHz 40CH QVI Qwi Doublers To transmitter 26 965MHz CH1 13 4825MHz CH1 13 7025MHz CH40 27 405MHz CH40 The VCO operating frequency for the receiver is 16 27MHz CH1 to 16 710MHz CH40 as the first local oscillator injected through the buffer amplifier Q302 into the first FET balanced mixer QR2 3 4 2 Basic Synthesis Scheme The crystal frequency 10 24MHz is divided by4069times to make 2 5KHz which is fed to one side of the phase detector The VCO output is divided by a programmable divider and fed to other side of the phase detector Pin 22 23 of IC6 The feedback loop is closed by phase detector output through an active low pass filter and using the output to control the VCO frequency through varicap diode DV1 2 Under locked conditions both of phase detector input signal must be identical at 2 5KHz The VCO frequency is then given by Receiver 0 0025 MHz OR 0 0025 XN MHz Since N is an integer the VCO frequency can be stepped up with 2 5 KHz increments By suitable choice of the desired output frequency can be obtained Channel 1 Channel 40 Transmit 5393 13 4825 5481 13 7025 Receiver 3254 16 2700 3342 16 7100 See the Table 1 for other Channels The VCO frequency goes to the doublers circuit with doubles the incoming signals BENE VCO
19. crease in C in the tuning circuit and the occurrence of may spurious To eliminate these effects the tuning capacitance is switched for transmission or reception The tank circuit consist of the primary of LV1 CV1 CV4 CV6 CV7 when receiving QV2 becomes off So the primary of LV1 and make tuning function when transmitting QW2 becomes on So the primary if LV1 and the parable capacitance of CV11 make turning function 4 3 9 Receiver Local Oscillator Outputs First Mixer The output of VCO is injected through buffer AMP and than The emitter follower output through the emitter of 1 st mixer or 2 3 Second Mixer The output of 10 240 MHz oscillator circuit with X2 is injected into the if IC of ICI Incoming if signal and 10 240 MHz signal are mixed inside the IF IC to 2 nd IF signal 455MHz FM audio signal are recovered with the way of quadrature detector AM signlas are recovered with envelope detector 4 4 Frequency Stability LET Fo Crystal Oscillator Frequency Fr Phase detector reference frequency Fvco VCO frequency Ft Transmit freqency THEN Fr Fo 1800 And under locked confitions Fr Fvco N Where N is the programmable divider divide ratio THEN X Fr N Fo 1800 From which it can be seen the percentage error in Ft is the percentage error in Fo The stability of the crystal oscillator is determined primarily by the crystal itself and having lesser deviation by the active and passive com
20. eneral Receiver Display 40 Channels and other functions indication Frequency Range 26 965 to 27 405 MHz Frequency Response 300 to 2 500 Hz Power Source 13 2 V DC Audio Output Load 8 OHM Resistive Audio Output 4 0 W or More Squelch Adjustable from 0 2 uV to 1 mV Sensitivity FM 20 dB SINAD under 1 0 uV or less 10 dB S N under 1 0 uV or less Intermediate Frequency IstIF 10 695 MHz 2ndIF 455 KHz Transmitter Carrier Power Conducted AM 1 W FM 4 0 Current Drain 13 2 V Supply Voltage No Modulation 1 100 mA No Modulation Max Modulation 1 400 mA Full Modulation Modulation Capabilities 90 96 FM 1 8 KHz Dev Spurious Radiation Less then 74 dBc Antenna Impedance 50 OHM Frequency Tolerance 0 002 2 2 1 2 2 2 4 2 5 2 6 Technical Description General Model CB 550 is an mobile type AM FM radio transceiver for use of the Citizen Radio Service Front Panel Controls LCD Display Cannel RX TX AQ SCAN AM FM EMG Indicator Receiver Audio Control With Power ON OFF Control Volume Squelch Control Volume S W ON TIGHT S W OFF AUTO SQ RF Gain Control Volume CHANNEL UP DOWN TACT SWITCH AM FM TACT SWITCH EMG TACT SWITCH Accessable Connectors Antenna Jack External Speaker Jack External Power Cord Microphone Jack Type of emission AM A3E FM F3E Frequency Range 26 965 MHz CH 1
21. foe Ant cannector 1 Ant connector Screw Mach ar TR Spring washer or TR or TR Bush Nylon66xGrassis 17 46 47 INSULATION WASHER PAPER S RED 1 Ss age Sa 50 Screw Mach Topite BH i5 _ O Oo y y y 51 SerewMech t 6x4L FH Bleck 1 For Escutcheon 932 LEDPCB Mea 1 53 Screw Top s 26 54 lt 55 2 63 15 EEN Doz 42 BOARD LAYOUT SECTIONS Main PCB Top side TCBSSOMAIN MPO4 pcb Mon May 26 09 26 06 2008 Main PCB Bottom side SSE 2 W 5 2 Front PCB Top side Ordo 5 9 e UBQOUSUB MPU4 MAP pcbdD Ilue 09 19 45 2006 Front PCB Bottom side Se p Puri ES 1808181381 888 s NSE 5505 04 Tue May 27 09 30 10 2008 5 3 LED PCB Top side LED PCB Bottom side 5 4 Volume PCB OOo 5 5 MIC PCB 5 5 88 211 2 90 9 i 1064 E 5 E MS SECTION6 BLOCK DIA
22. ke 4W indication of RF power meter After finished the above adjustment check the RF power meter reading is changed 1W under Low state The tuning is adjusted so that the actual power is from 3 6 to 3 9 watts There are no other additional controls for adjusting the TX output power 4 Modulation AM The MIC input is fed to audio power amplifier IC3 which drives modulation transformer TM1 The audio output at the secondary of TMI is fed the modulating audui signals series with the B voltage to the collectors of driver QT3 and TX power AMP QT4 to modulate both these stages A portion of the modulating voltage is rectified with DM1 which controls QM2 and QMI to attenuate the MIC input to MIC AMP IC3 The resulting feedback loop keeps the modulation from exceeding 100 percent inputs approximately 40dB greater than that requires to produce 50 modulation FM The MIC input is fed to MIC audio amplifier IC7 that drives modulation varicap diode DV1 2 in the VOC circuit RV3 limits the incoming modulation audio levels to inhibit over modulation While reading the modulation factor on the modulation analyzing equipment adjustment RV3 shall not exceed 2 0 KHz deviation 4 5 2 Receiver CB receiver is dual conversion super heterodyne type with the first IF 10 695MHz and the second IF 455K Hz Receiver is separated two blocks 151 IF section and 2 nd IF section The PLL synthesizer supplies l st local frequency 16 270MHz 16 710MHz With the
23. ponents of the oscillator The choice of crystal and components is such that the required frequency stability is maintained over the required voltage and tempertature range 4 5 Description of other circuits 4 5 1 Transmitter 1 RF Amplification The output of doubler AMP QW2 is fed through double tuning 27MHz LT1 and LT2 to the base of PRE AMP 2 The output is then supplied through tuning circuit LT3 to RF driver AMP QT3 The QT3 output is capacitance divided by tuning circuit CT10 CT12 LT4 CT13 and passed through the base of final RF stage QT4 The QT4 output is supplied to the antenna through L C tuning circuit CT21 CT22 LT11 CT26 LT12 CT27 CT28 LT14 CT30 2 Circuit for suppression of spurious radiation The tuning circuit between frequency synthersizer and final AMP QT4 and 4 stage PI network CT21 CT22 LT11 CT26 LT12 CT27 CT28 LT14 CT30 in the QT4 output circuit serve to suppress spurious radiation This network serves to impedance match QT4 to the antenna and to reduce spurious content to acceptable levels in the frequency synthersizer 3 Circuit for Limiting Power After finished all alignment the constant voltage supply circuit limites the available power 4W or slightly less Corresponding three TR control supply voltage of RF power amplifier When power low S W function changed the supply voltage Tune all the trimming parts for max indication of RF power meter and adjust VR3 to ma
24. ss then 8 1KHz Image Rejection 60 dB E Adjacent Channel Rejection 60 dB Conducted Spurious More than 60 dB Frequency Response 1300 to 2500Hz Built in Speaker 8 Ohms round Squelch Adjustable Threshold less than 1 microvolt Specification is subject to change without prior notice SECTION2 CIRCUIT DESCRIPTION Contents 1 General 1 1 Receiver 1 2 Transmitter 2 Technical Description 2 1 General 2 2 Type of emission 2 3 Frequency Table 2 4 RF Power Output 2 5 DC input Voltage and Current with 13 2V DC Input to Power AMP 2 6 Receiver IF and Local Oscillator Frequencies 3 Semiconductors and Function 4 Description of Frequency Determining and Stabilizing Circuit 4 1 Introduction 4 2 Basic Synthesis Scheme 4 3 Descriptions of Each Block 4 3 1 Introduction 4 3 2 Reference Frequency 4 3 3 VCO 4 3 4 Programmable Divider and its Control 4 3 5 Phase Detector and VCO Control 4 3 6 Transmitter Receiver Buffer AMP 4 3 7 Transmitter Doublers 4 3 8 Switching of Turning Capacitor in VCO 4 3 9 Receiver Local Oscillator Outputs 4 4 Frequency Stability 4 5 Description of other Circuits 4 5 1 Transmitter 4 5 2 Receiver 5 Test Equipment Setup and Alignment Instructions 5 1 VCO Section 5 2 Transmitter Section 5 3 Receiver Section 6 Test Data 7 Schematic Diagram 8 Block Diagram 9 PCB Map 10 PARTS LIST 1 1 1 1 2 G
25. t Function UUT as shown on Figure 3 1 AM mode Audio generator 2 CB 1 Set to 1KHz 50mV 3 Unit TX condition 2 Input to MIC RVM1 Max 90 PTT on Adjustment Alignment Step Test Item UUT setting Equipment setting Spec poin FM Channel CH19 Connect the equipment and Deviation Function UUT as shown on Figure 3 Adjustment 1 FM mode Audio generator 2 1 Set to 1KHz 50mV 2 Input to MIC 4 RV3 1 8KHz Unit TX condition PTT on Adjustment Others Don t care 1 Adjust RV3 to obtain 1 8KHz deviation TX Band Mode F Band Connect the equipment and honid ou Signal Channel CH19 UUT as shown on Figure 2 display Meter Function AM 1W FM 4W AM mode of the UUT 1 FM mode Adjustment T 5 Adjustment 2 CB 1 AM 1W TX Bar 2 FM 4 W FM mode Unit TX condition 4W PTT on TX Bar Others Don t care Channel CH19 Connect the equipment and Function UUT as shown on Figure 4 1 AM mode Spectrum 2 CB 1 Reference Level 35dB x 4 2 Span 50 2 nit condition Half harmonic Ber Adjustment TA on i 6 of the UUT 1 Carrier Level by spectrum lt 400dBm Others Don t care Center Frequency 27 185MHz LT2 Adjustment Spec 33 35dBm 2 Half Harmonic by spectrum Center Frequency 39 5925MHz Spec lt 100 dBm Channel CH19 Connect the equipment and Function UUT as shown on Figure 4 1 AM mode Spectrum 1 Reference Level 35dB 2 CB 2 Span 50KHz 274
26. tti SERVICE MANUAL MULTI CHANNEL AM FM TRANSCEIVER TCB 550 TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 CIRCUIT DESCRIPTION 1 GENERAL TECHNICAL DESCRIPTION SEMICONDUCTORS AND FUNCTION DESCRIPTION OF FREQUENCY DETERMINING AND STABILIZING CIRCUIT a B N TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS SECTION 3 PART LIST SECTION 4 MECHANICAL DISASSEMBLY SECTION 5 BOARD LAYOUT 5 1 MAIN PCB 5 2 FRONT PCB 5 3 LED PCB 5 4 VOLUME PCB 5 5 MIC PCB SECTION 6 BLOCK DIAGRAM SECTION 7 SCHEMATIC SECTION1 SPECIFICATIONS Channel 40 See the frequency band chart Frequency Range 126 56 MHz 28 00 MHz G Operating mode Frequency Control Synthersizer N Frequency Tolerance 0 002 E Operating Temperature Range 1 010 55 Microphone Plug in Type L Input Voltage 113 2 DC 15 124 W x 135 L x 37 1655 9 Antenna Connector Antenna Connector Power Output Duty cycle 10 4 Watts 13 2V DC A Modulation AM from 85 to 95 FM 1 8KHz 0 2KHz Frequency Response 30082 to 30002 T Output Impedance 50ohms Unbalanced L Harmonic Suppression More than 36dBm R Current Drain AM Full Mod 1 6A Max Receiving System Dual conversion superheterodyne IF Frequencies Double Conversion 1st 10 695MHz 2nd 455KHz Sensitivity 0 78 for 10dB S N N in AM Mode E 0 51 for 20dB SINAD in FM Mode Audio Output Power 2 0W 8 Ohm Audio Distortion Le
27. ustment 1 adjust the RVQ2 DC Power Supply A 2053 EA AC Level Meter Speaker Jack Distortion Meter SINAD Meter 8 Sum S oa 556 Figure 5 SECTION3 PART LIST 5 0 5504 000 PCB ASS Y TCB550 PART 102 331J S00 RES 0 5W 5 ST 3 PART 102 471J S00 RES 4700HM 0 5W 5 ST PART 142 100J 000 CHIP RES 0603 100HM 5 PHILIPS PART 142 102J 000 CHIP RES 0603 1KOHM 5 PHILIPS 6 PART 142 104J 000 RES 0603 100KOHM 5 PHILIPS PART 142 105J 000 RES 0603 1MOHM 5 PHILIPS 8 PART 142 222J 000 RES 0603 2 2KOHM 5 PHILIPS 9 PART 142 223J 000 CHIP RES 0603 22KOHM 5 PHILIPS PART 142 472J 000 RES 0603 4 7KOHM 5 PHILIPS PART 142 473J 000 RES 0603 47KOHM 5 PHILIPS 29 00 PART 212 102B 3K0 CHIP CERAMIC CAP 0603 0 001UF X7R 16V 10 PHILIPS PART 212 103B 3K0 CHIP CERAMIC CAP 0603 0 01UF X7R 16V 10 PHILIPS PART 212 105F 320 CERAMIC CAP 0603 1UF Y5V 16V 20 80 PHILIPS PART 212 470C 6J0 CERAMIC 0603 47PF NPO 50V 5 PHILIPS PART 305 0226 000 CHIP TR KRA226S PART 305 0401 000 CHIP TR KRC401E PART 305 0404 000 CHIP TR KRC404E PART 320 0509 006 CPU FLASH JT5BL9 TOSHIBA TCB550 PART 338 2402 A00 EEPROM FT24C02A FMD PART 350 0603 001 CHIP LED BLUE 0603 19 217 BHC CLEM2RY YADA PART 352 4686 000 SDM8A4

TCB-550 service manual(081002)

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