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TCB-770 service manual_050818

1. 1 26 965 21 27 215 2 26 975 22 27 225 3 26 985 23 27 235 4 27 005 24 27 245 5 27 015 25 27 255 6 27 025 26 27 265 7 27 035 27 27 275 8 27 055 28 27 285 9 27 065 29 27 295 10 27 075 30 27 305 11 27 085 31 27 315 12 27 105 32 27 325 13 27 115 33 27 335 14 27 125 34 27 345 15 27 135 35 27 355 16 27 155 36 27 365 17 27 165 37 27 375 18 27 175 38 27 385 19 27 185 39 27 395 20 27 205 40 27 405 2 4 Power Output AM 1 0 W FM 4 0 W 2 5 DC Iinput Voltage and Current with 13 2V DC Input to Power AMP Transmitter Power Amp Voltage 12 5 V Current 727 mA Transmitter Driver Amp Voltage 12 5 V Current 120 mA 2 6 Receiver IF and Local Oscillator Frequencies First IF 10 695 MHz Second IF 455 KHz First Local Oscillator 10 695 MHz Below Receiving Frequency Second Local Oscillation 10 240 MHz 3 Semiconductors and Function 3 1 Transistor Ref No Description Manufacturer Function Q101 KTC3880S KEC RX Amplifier 0102 211 1 st Mixer Q103 KTK211 KEC 1 st Mixer Q104 KRCIOIS KEC RX Bandl Switching Q105 1015 RX Band2 Switching 0121 KRC110S KEC Q122 KRC112S KEC RX RSSI Level Control 0151 KTC3875S KEC RX FM AF Amplifier 0152 KRC112S KEC FM AF Mute at AM Mode 0153 KRCIOIS KEC FM AF Mute at AM Mode Q154 KRC112S KEC RX AF Mute at TX Mode 0161 KTC3880S KEC AM IF Amplifier 0162 KTC3880S KEC
2. 10K KRAIQIS cH R817 2 2K 0957 D956 09550954 0953 0952 0951 LTBABS S1 UAEB TE 09660965 LT8AB3 5I UAEB TE 0958 0959 8 3 51 6 T901T2 1 THLE TGB 770 DRAWN CHECKED CHECKED APPROVED S H KWON 2005 08 10
3. SECTIONS BOARD LAYOUT v 5 o T LO Main Bottom side al Sica Gee FREER T as a JEE m M 2 a 1 ee BEER 5 2 Front Top side Front PCB Bottom side a 5 3 5 LED PCB Bottom side 5 4 Volume PCB WILILILILIIILO 5 5 MIC PCB 5 m a 88 2 90 9 Du 4 i 1064 E E MS SECTIONG6 BLOCK DIAGRAM TST MIXER FM IC 0102 0103 CH ROTARY SW vow exam ILS z BB oo s rm LOCK EMG CPU RX TX Q802 os BACK LIGHT LED CONTROL 095170954 D 1 1 1 1 1 1 L 71710 24 2 AM IF Q161 0162 SQUELCH C102B 1802
4. VOLUME PCB 16 HARNESS WIRE UA YRIZ A CURE 5 epic ympi a SE oe YRIDI A S VOL 59952 DOWN PIT 5953 UP MIC951 C MIC C951 103 L 1503 PLL CLOCK PLL_DATA gt PLL_EN 1 RBOB 220 _ 07103 TX_INH 150801 SOMBA2299A Ba Vw HH gecsdaa dd m LOCK EMG H SPENT SR UG 1504 6 8uH 99 BUSCO were RIT 15026 Tato WEDER 3501 Mic SOCKET M SOCKET to MAIN IC UP7D0WR 1 Wccue7oows 504 1 501 es PCB HARNESS WIRE SWBOG Za 0 DN 7 103 27 AFIN ev KEr_TONE jg PULDATA PILLEN EtPROM FEPROM_DATA 5 1 01 7210 sour a m vas gt PWR LOW AF_PWR_CTRI WR LOW SW807 AM FM SWB08 a Q UP swaoi ZA SCAN lt 18 lt T SQUELCH o 57 5812 REIS x 4 RBIOTK TK 277
5. 164 R182 R183 R187 R200 R222 R234 R238 R308 f 46 CHIP RESISTOR 1K 1 16W 595 T 1608 PHILIPS SMD 19 R312 R410 R501 R571 R572 050412 01 R955 R956 R957 R958 R123 R157 R161 R185 R315 R321 R322 R323 R324 R412 050418 03 47 RESISTOR 10K 1 16W 5 T 1608 PHILIPS SMD 16 R413 R414 R703 R821 R822 050715 02 R914 R140 R142 R159 R186 R188 0 48 RESISTOR 100K 1 16W 595 T 1608 PHILIPS SMD 9 R202 R233 R309 R311 050422 02 0 49 CHIP RESISTOR 2M 1 16W 5 T 1608 PHILIPS SMD 1 405 050715 02 50 CHIP RESISTOR 1 5K 1 16W 595 T 1608 PHILIPS SMD 2 R742 R924 51 CHIP RESISTOR 15K 1 16W 5 T 1608 PHILIPS SMD 3 R155 R166 R235 52 CHIP RESISTOR 150K 1 16W 5 T 1608 PHILIPS SMD 1 R701 53 CHIP RESISTOR 2 2 1 16W 5 T 1608 PHILIPS SMD 1 R711 53 CHIP RESISTOR 22 1 16W 5 T 1608 PHILIPS SMD 1 R204 ECO050422 02 54 CHIP RESISTOR 220 1 16W 5 T 1608 PHILIPS SMD 2 R169 R702 R131 R203 R237 R307 R402 55 CHIP RESISTOR 2 2K 1 16W 5 T 1608 PHILIPS SMD 12 R817 R822 R912 R922 R923 ECO050412 01 R961 R01 56 CHIP RESISTOR 22K 1 16W 5 T 1608 PHILIPS SMD 6 E ESTER TET ER 57 CHIP RESISTOR 220K 1 16W 595 T 1608 PHILIPS SMD 2 R171 R177 58 CHIP RESISTOR 2 2M 1 16W 595 T 1608 SMD 1 R153 59 CHIP RESISTOR 2 7K 1 16W 5 T 1608 PHILIPS SMD 1 R167 60 CHIP RESISTOR 27K 1 16W 5 T 1608 PHILIPS SMD 2 R102 R403 61 CHIP RESISTOR 33K 1 16W 595 T 1608 PHILIPS
6. Acryl Double tape Bezzel 0 16t Escutcheon ABS Black Double tape Window 0 16t Window Acryl illuminator Acryl Key pad Silicone PU coating LCD Bracket SPTE 0 31 LCD Reflector Acryl Diffuser Lens Acryl Zebra Silicone Stud bolt ABS BsBm Packing rubber NBR Ant terminal SPTC 0 21 Felt Cover 0 3t Cushion EVA sponge TX shield can 2 SPTE 0 3t Shield cover SPTE 0 3t Speaker Bracket Spk EGI 1 0t Felt Spk Dia 65 x 0 3t Mic connector Cu tape 1 Cu 49x9x0 1t Cu tape 2 Cu 77x15x0 1t TX shield can 1 SPTE 0 3t VCO shield can SPTE 0 3t White sheet 0 11 S W PCB PVC Cord stopper Washer for Ant connector Nut for Ant connector Bush Nylon66xGrass15 TR Heat sink AL Mic connector Screw Mach M2 6x5L FH po a S Se E E E e a mS 5 gt For Escutcheon Screw Mach M3x8L Taptite BH For Speaker bracket Main Screw Mach M3x10 BH For TR Nut M3 For TR Spring washer M3 For TR Screw Tap 2 6x8L BH For Key PCB Mica 0 41 gt Co
7. BUFFER Q202 GAIN MOD TRANS ALC 0233 0234 IC401 A FM AF AMP LIMITER D401 FILTER 401 TX SW 5 6V REG 0951 8 2V REG Q921 REG 0911 0913 IC amp MOD TRANS TX Q924 5 ON OFF RX 0923 DOUBLER Q701 PRE AMP Q702 RF DRIVER Q703 TITLE TTI TCB 770 BLOCK DIAGRAM S H KWON 2005 01 31 CHECKED CHECKED APPROVED SHEET 1 SECTION7 SCHEMATIC 8104 100 low 0102 0122 xF101 R108 016300 7 1 LE7IS2NM xw 0182 38755 10108 27K 103 c2 18 015 BANDI 5 125 R152 6 8K Se R200 K 6157 R157 103 10 9151 KTC38758 156 103P 155 p 103P 103 0185 KTC38758 KDS184 m 473 _ gt C201 AF V IN 0202 5 _ c214 223 8203 C203 22K 223P AF V OUT 103P D 102P
8. Descriptions of Each Block 4 3 1 Introduction The synthesizer is implemented with the following components PLL IC IC301 X TAL X301 VCO VARICAP DIODE 0301 IC1301 is CMOS LSI that includes most of PLL block The Q301 L301 C311 C312 C313 C314 variable capacitance diode D301 are clapping oscillator circuit to operate as a VCO of the IC301 Q305 is a switching transistor to connect or disconnect the tuning capacitor in the VCO oscillator tank circuit for transmitter or receiver 0302 works as a buffer amplifier for RX local frequencies 16MHz and TX carrier generating frequencies 13MHz 4 3 2 Reference Frequency The crystal X301 4 5MHz and other components at Pin 1 and 24 of IC301 can make a reference frequency oscillator with internal amplifier 4 3 3 VCO Q301 and surrounding parts are consisting a clapping oscillator works as a VCO of IC301 With appropriate control voltage on D301 the VCO can be oscillate over the required range of 13 4825MHz to 16 710MHz 4 3 4 Programmable Divider and its Control The programmable input for each channel are stetted by the PLL Clock Pin 11 PLL Data Pin 12 PLL Enable Pin 13 of IC801 Each input signal to control the PLL IC is done with provide key input Pin 18 19 25 26 27 28 29 32 33 34 35 37 For each key input an internal code converts EEPROM appropriate control to the programmable divider for that channel Since the change transmit and receive and additiona
9. 0 16t ECO 050402 01 Hankyung For Bezel 12 VOL KNOB ABS BLACK Bonso For Rf amp On off 13 DUAL KNOB ABS BLACK Bonso For Rf amp On off 14 CHKNOB ABS BLACK same as TCB880 Vol knob Bonso For Channel 15 D SPRING 5 5 0 2t Zn plating TTI For Rf amp On off 16 KEYPAD SILICONE CLEAR PU coating ECO 050328 07 Hankyung 17 LCD BRACKET SPTE 0 3 Hankyung For diffuser 18 DIFFUSER LENS ACRYL CLEAR Bonso Diffuser 19 REFLECTOR ACRYL CLEAR Bonso For diffuser 20 ZEBRA SILICONE Hankyung For diffuser 21 WINDOW ACRYL CLEAR Bonso 22 ILLUMINATIOR ACRYL CLEAR Bonso For Rf amp On off amp Channel 23 SCREW MACH M2 6 5L Black FH same as TCB880 Bonso Esc Main body mounting 24 SCREW TAP 2 6 81 25 Ni plating BH Bonso zpu mu DOR moaiintina 25 DOUBLE TAPE WINDOW 0 16t Hankyung For window 26 WHITE SHEET POLYESTER 0 1t Hankyung For diffuser 27 RING NUT BsBm same as TCB880 Hankyung For channel Rf on off 28 DOUBLE TAPE BEZEL 1 23 1 1 0 16T NEW ECO 050731 03 Bonso For Bezel 29 DOUBLE SIDE FOR DIFFUSER 29 3 5 0 2T MAIN BODY ASS Y NEW ECO 050731 03 Bonso For diffuser 30 MAIN BODY EGI 1 0
10. 2 C801 C802 26 CHIP TANTAL 10uF 16V A SMD 1 C811 27 TRANSISTOR KRA101S SOT 23 KEC SMD 1 Q803 28 CHIP TRANSISTOR KRC101S SOT 23 KEC SMD 1 Q802 29 CHIP TRANSISTOR KRC104S SOT 23 KEC SMD 1 Q801 0953 0954 0955 0957 0958 ECO050325 04 30 LED BACK LIGHT CHIP LED IWS 164 BXWF ITSWELL SMD 8 D959 D965 D966 050511 02 31 AT24C02 SOP 8 SMD 1 802 32 IC CPU TMP87PP21DF TOSHIBA SMD 1 IC801 33 LCD DISPLAY SDM8A2299A FOR TCB 770 SANTECH MAN 1 LCD801 34 SW TACT SKTS 1102A SEKWANG SEKWANG MAN 5 2 SW802 SW806 SWa07 35 RESONATOR 4 0MHz ZTA4 00MG D TRON D TRON MAN 1 X801 NAME 8 DESCRIPTION MAIN BODY ASS Y VENDOE CODE VENDOR Location NO REMARKS 36 CONNECTOR CH 239 A M SAMWOO MAN 1 J701 ECO05051 1 02 37 TRANSISTOR KTA1658 KEC MAN 1 Q911 38 TRANSISTOR 2SC2078 SANYO YANG WON MAN 1 Q704 39 KIA7217AP KEC MAN 1 201 40 2PIN PLUG ASS Y FINE FINE MAN 1 J900 MAIN PCB AUTO ASS Y 41 PCB MAIN FR 4 R 1 CAPITAL SMD 1 ECO050809 01 42 CHIP RESISTOR 0 1 16W 5 T 1608 PHILIPS SMD 3 R108 R137 R201 050412 01 43 CHIP RESISTOR 1 1 16W 595 T 1608 PHILIPS SMD 1 R706 44 CHIP RESISTOR 10 1 16W 5 T 1608 PHILIPS SMD 2 R133 R301 45 CHIP RESISTOR 100 1 16W 5 T 1608 PHILIPS SMD 6 euni RIIA R126
11. 4 5MHz by 900 times and 1800 times See Table 1 for transmitter receiver mode VCO frequencies 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 amp 27 055 3272 10 36 5411 13 5275 9 277 065 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 16 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 5469 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
12. AM IF Amplifier Q163 1025 0164 KTA1504S KEC Automatic Noise Level Control 0181 KTC3875S KEC RX RF Mute at TX Mode 0182 KTC3875S KEC AGC Q183 KTC3875S KEC AGC Q201 1015 0202 1115 AF Path Q233 KTA1504S KEC Automatic Level Control Q234 KTC3875S KEC Automatic Level Control Q301 KTC3880S KEC VCO Q302 KTC3880S KEC RX TX VCO Buffer 0303 KTC3880S KEC VCO Buffer 0305 KRCIOIS KEC TX VCO Control Q311 KRCIOIS KEC VCO Bandl Switching Q312 KRCIOIS KEC VCO 2 Switching Q313 KRCIOIS KEC VCO Band3 Switching Q502 KRCII1IS KEC FM TX AF Mute at AM TX Q701 KTC3880S KEC TX Doublers 0702 KTC3880S KEC TX Pre Amplifier 0703 KTC1006 KEC TX Driver Amplifier Q704 25 2078 SANYO TX Power Amplifier Q742 KTC3875S KEC at RX Mode Q801 1045 CPU Reset Q802 KRCIOIS KEC CPU RX TX Control Q803 KRAIOIS KEC MIC Lock Control Q911 KTA1658 KEC Main Regulator Q912 15045 Main Regulator Q913 1125 Main Regulator Control Q914 KRC102S KEC Power Low Control Q921 KTC3875S KEC 8 2V Regulator Q923 KTC3875S KEC RX B 0924 15045 0931 KTC3875S KEC Main Regulator 5 6V Q941 1115 1241 1241 1015 1015 1105 1115 Back Light LED Control Back Light LED Control Back Light LED Control Back Light LED Control TX AF Mu
13. 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 Audio Output 4 0 W or More Squelch Adjustable from 0 3 uV to 100 uV Sensitivity 20dB SINAD under 1 0 uV RF Signal or less 10 dB S N under 1 0 uV RF Signal or less Intermediate Frequency stIF 10 695 MHz 2ndIF 455 KHz Transmitter Carrier Power Conducted AM 1 W FM 4 W Current Drain 13 2 V Supply Voltage No Modulation 1 000 mA Max Modulation 1 400 mA Modulation Capabilities 90 96 1 8 KHz Dev Spurious Radiation Less then 72 dBc Antenna Impedance 50 OHM Frequency Tolerance 0 002 2 1 Technical Description General Model CB 770 is an mobile type AM FM radio transceiver for use of the Citizen Radio Service Front Panel Controls LCD Cannel and RX TX Signal Level Indicator Receiver Audio Control With Power ON OFF Control Volume Squelch Control Volume RF Gain Control Volume MIC GAIN Control Volume CHANNEL UP DOWN Rotary Switch EMG Emergency Channel Select Key AM FM Select Key Scan Key Q CHANNEL UP Key Q CHANNEL DOWN Key L2 6 6 6 6 amp 9 960 Accessorily Connectors Antenna Socket Q External Speaker Jack External Signal Meter Jack Microphone Condenser Microphone Type of emission AM A3E FM F3E 2 3 Frequency Table
14. Minimum Connect RF Power to EXT ANT connector on the set Figure 2 output power on the signal meter Frequency Counter Audio Generator RF Power Connector Meter Figure 2 RF Power Figure 3 DC Power Supply Modulation Meter 5 3 Receiver Section 5 3 1 Test Equipment Required e Standard Signal Generator SSG DC power supply 13 8V 3A AC Level Meter e Distortion Meter Oscilloscope e SINAD Meter 8 ohm Dummy Load 5 3 2 Alignment Procedure Function FM Mode CB ANL Off DX SSG 27 185MHz 1KHz 67dBm 1 5KHz Dev Volume Optional Squelch Maximum RF Gain Maximum Meter across EXT SPK jack with 8 ohm Dummy Load Figure 5 Step Setting Connection Adjuster Adjust for 1 AM Sensitivity Adj Connect RF Signal Generator L101 Audio Channel amp Frequency to EXT ANT Connector L103 Maximum 19CH 27 185MHz Connect AC Level Meter and L104 Distortion Receive Distortion Meter and SINAD L105 Minimum Function AM Mode Meter across EXT SPK jack L107 Reduce output CB ANL Off DX with 8 ohm Dummy L108 from SSG SSG 27 185MHz Load Figure 4 L112 until the audio 67dBm 30 Mod output Volume Optional becomes about Squelch Minimum 10dB S N RF Gain Maximum 2 FM Sensitivity Adj Connect RF Signal Generator 1109 Audio Channel amp Frequency to EXT ANT Connector Maximum 19CH 27 185MHz Connect AC Level Met
15. SMD 3 R172 404 R407 62 CHIP RESISTOR 3 3M 1 16W 595 T 1608 PHILIPS SMD 1 R135 63 CHIP RESISTOR 390 1 16W 5 T 1608 PHILIPS SMD 1 R156 64 CHIP RESISTOR 39K 1 16W 5 T 1608 PHILIPS SMD 2 R163 R306 65 NAME 8 DESCRIPTION CHIP RESISTOR 47 VENDOE CODE 1 16W 5 T 1608 PHILIPS VENDOR SMD Location NO R184 R705 R913 REMARKS R101 R105 R106 R165 R181 0 66 CHIP RESISTOR 470 1 16W 5 T 1608 PHILIPS SMD 7 n236 R138 R223 R406 704 R915 050412 01 67 CHIP RESISTOR 4 7K 1 16W 5 T 1608 PHILIPS SMD 6 R962 6005011835 R122 R139 R174 R176 8300 050715 02 68 RESISTOR 47K 1 16W 5 T 1608 PHILIPS SMD 9 6303 R411 R415 een 69 CHIP RESISTOR 470K 1 16W 5 T 1608 PHILIPS SMD 2 R154 R573 70 CHIP RESISTOR 5 6K 1 16W 5 T 1608 PHILIPS SMD 1 408 71 CHIP RESISTOR 56K 1 16W 5 T 1608 PHILIPS SMD 2 R103 R313 72 CHIP RESISTOR 6 8K 1 16W 5 T 1608 PHILIPS SMD 1 R152 73 CHIP RESISTOR 68K 1 16W 5 T 1608 PHILIPS SMD 1 R189 74 CHIP RESISTOR 82K 1 16 5 T 1608 PHILIPS SMD 1 R173 75 THERMISTOR 100 OHM NCP18XF101J03RB MURATA SMD 1 131 ECO050525 02 76 THERMISTOR 10K OHM NCP18XH103J03RB MURATA SMD 1 TH101 77 CHIP CERAMIC 0 001UF 1608 PHILIPS SAMSUNG SMD 4 1 181 C230 C239 C404 C111 C114 C115 C116 C117 C118 C153 C154 C155 C156 C157 C
16. ST MINI MAN 1 R713 133 FILM RESISTOR 1K 1W 5 ST MINI MAN 2 R951 R952 050418 03 134 METAL OXID RESISTOR 10 2W 5 ST BULK MAN 1 R208 135 RESISTOR SEMI 100KB PH0630NOXO0X HA1 B 104 SOUNDWELL MAN 2 RV571 RV572 136 RESISTOR SEMI 2 2KB PH0630NOXO0X HA1 B222 SOUNDWELL MAN 1 RV231 137 RESISTOR SEMI 22KB PH0630NOXO0X HA1 B223 SOUNDWELL MAN 1 RV401 138 RESISTOR SEMI 4 7KB PH0630NOXO0X HA1 B472 SOUNDWELL MAN 2 RV131 RV911 139 ELECT CAPACITOR 1UF KR1 16V010MA 5X11 DONGXIANG MAN 3 C167 C407 C408 140 ELECT CAPACITOR 10UF KR1 16V100MA 5X11 DONGXIANG MAN 7 oF 141 ELECT CAPACITOR 100UF KR3 16V101MA 5X11 DONGXIANG MAN 2 C821 C923 142 ELECT CAPACITOR 1000UF KR1 16V102MF 10X20 DONGXIANG MAN 4 C207 C213 C217 C912 143 ELECT CAPACITOR 0 22UF KR1 16VR22MA 5X11 DONGXIANG MAN 1 C124 144 ELECT CAPACITOR 2 2UF KR1 16V2R2MA 5X11 DONGXIANG MAN 1 C741 145 ELECT CAPACITOR 22UF KR1 16V220MA 5X11 DONGXIANG MAN 1 C221 050412 01 146 ELECT CAPACITOR 220UF KR1 16V221MB 6 3X20 DONGXIANG MAN 3 C210 C953 C954 147 ELECT CAPACITOR 33UF KR1 16V330MA 5X11 DONGXIANG MAN 1 C209 148 ELECT CAPACITOR 4 7UF KR1 16V4R7MA 5X11 DONGXIANG MAN 3 C208 C411 C960 149 ELECT CAPACITOR 47UF KR1 16V470MA 5X11 DONGXIANG MAN 5 C143 C185 C206 C233 C933 150 DISK 100P MAN 1 C735 151 TRIMMER 20PF KCVN620 FOKITS MAN 1 CT301 050325 04 152 TRANSFORMER CHOKE T1 FINE FINE MAN 1 T901 050509 02 153 TRANSFORMER EI 24
17. 1608 PHILIPS SAMSUNG SMD 1 315 95 CHIP CERAMIC 33PF 1608 PHILIPS SAMSUNG SMD 3 C108 C302 C318 NAME amp DESCRIPTION VENDOE CODE VENDOR Location NO REMARKS 96 CHIP CERAMIC 330PF 1608 PHILIPS SAMSUNG SMD 6 C719 C723 C725 C126 97 CHIP CERAMIC 39PF 1608 PHILIPS SAMSUNG SMD 1 C705 C103 C105 C107 C182 C328 98 CHIP CERAMIC 47 1608 PHILIPS SAMSUNG SMD 99 CHIP CERAMIC 1608 PHILIPS SAMSUNG SMD 1 1 718 100 CHIP CERAMIC 56PF 1608 PHILIPS SAMSUNG SMD 1 C130 101 CHIP CERAMIC 6PF 1608 PHILIPS SAMSUNG SMD 2 1 317 321 102 CHIP CERAMIC 68PF 1608 PHILIPS SAMSUNG SMD 3 C97 C131 C732 103 CHIP CERAMIC 680PF 1608 PHILIPS SAMSUNG SMD 1 414 104 CHIP CERAMIC 82PF 1608 PHILIPS SAMSUNG SMD 2 406 C707 105 8PF 1608 PHILIPS SAMSUNG SMD 1 1 326 106 CHIP CERAMIC 9PF 1608 PHILIPS SAMSUNG SMD 1 Ct10 107 CHIP TANTAL 2 2uF 16V A SMD 1 1 01 ECO050418 03 108 CHIP TRANSISTOR KTK211 SOT 23 KEC SMD 2 0102 0103 109 TRANSISTOR KRA102S SOT 23 KEC SMD 1 10163 _ 0104 0105 0153 0222 0305 110 TRANSISTOR KRC101S SOT 23 KEC SMD 10 811 0312 Q313 0053 FC 0050412 01 111 CHIP TRANSISTOR KRC102S SOT 23 KEC SMD 1 0914 112 CHIP TRANSISTOR 1108 SOT 23 KEC SMD 3 Q121 0960 0961 050715 02 113 CHIP TRANS
18. 161 C162 C183 C184 C201 C231 C234 C235 C323 78 CHIP CERAMIC 0 01UF 1608 PHILIPS SAMSUNG SMD 38 C442 0501 C502 C503 C504 C506 C703 C704 C708 C713 C901 C902 C903 C911 C922 C924 C932 C122 C123 C132 C134 C135 C137 C138 C168 C169 C180 79 CHIP CERAMIC 0 1UF 1608 PHILIPS SAMSUNG SMD 23 C186 C205 C236 C308 C322 050715 02 C325 C330 C401 C402 C405 C413 C571 C573 80 CHIP CERAMIC 1UF 1608 PHILIPS SAMSUNG SMD 2 C159 C961 81 CHIP CERAMIC 0 022UF 1608 PHILIPS SAMSUNG SMD 5 166 C203 C214 C238 C403 C152 C163 C164 C165 C212 82 CHIP CERAMIC 0 047UF 1608 PHILIPS SAMSUNG SMD esto C721 C814 83 CHIP CERAMIC 0 068UF 1608 PHILIPS SAMSUNG SMD 1 410 84 CHIP CERAMIC 10PF 1608 PHILIPS SAMSUNG SMD C96 C113 C324 C101 C109 C303 C304 C305 85 CHIP CERAMIC 100PF 1608 PHILIPS SAMSUNG SMD 12 1 313 C314 C711 C712 C731 050812 02 733 C736 86 CHIP CERAMIC 150PF 1608 PHILIPS SAMSUNG SMD 4 1 102 C104 C106 C311 87 CHIP CERAMIC 16PF 1608 PHILIPS SAMSUNG SMD 1 1 316 88 CHIP CERAMIC 18PF 1608 PHILIPS SAMSUNG SMD 4 98 C99 C112 C119 89 CHIP CERAMIC 180PF 1608 PHILIPS SAMSUNG SMD 2 1 701 734 90 CHIP CERAMIC 2PF 1608 PHILIPS SAMSUNG SMD 1 C730 91 CHIP CERAMIC 22PF 1608 PHILIPS SAMSUNG SMD 2 C312 C727 92 CHIP CERAMIC 220PF 1608 PHILIPS SAMSUNG SMD 6 93 1608 PHILIPS SAMSUNG SMD 1 319 94 CHIP CERAMIC 30PF
19. 311 C312 C313 and C314 When the VCO is working as a receiver Q305 becomes turn OFF So L301 and C311 D301 makes turning function When transmitting Q305 becomes ON S the 0 L301 an parallel capacitance of C316 and C311 make turning function 4 3 9 Receiver Local Oscillator Outputs FIRST MIXER The secondary output signal of L107 is injected to the sources of 1 st mixer Q102 Q103 in the 1 st IF mixer section SECOND MIXER The output of 10 24MHz oscillator circuit with X101 is injected into the IF IC IC101 internally Incoming IF signal and 10 24MHz signal are mixed inside the IF IC to extract 2 nd IF signal 455KHz FM audio Signals are recovered with the way of quadrature detector AM signals are recovered with envelope detector 4 4 Frequency Stability Let Fo Crystal oscillator frequency Fr Phase detector reference frequency Fvco VCO frequency Ft Transmit frequency Then Receiver Fr Fo 900 Transmitter Fr 2 Fo 1800 And under locked conditions Fr Fvco Where is the programmable divider divide ratio Then Fvco N X Fr From which it can be seen the percentage error in Ft is the same as 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 components of the oscillator The choice of crystal and components is such that the required frequency stability is maintained over t
20. C201 and sets the maximum level of modulation Form the center tab of RV231 and Q233 the feedback signal is rectified by diode D233 filtered by C233 and supplied the Q234 The collector of Q234 is tied directly TX audio input to control gain That is when the audio output is higher that the preset level of RV231 the information is reflected through Q233 and Q234 reducing the gain of IC201 4 5 2 Receiver Overload protection is provided to receiver s semiconductors by diode D101 These diodes have a little effect on the incoming signal from another CB station they protect the receiver from stray transmitter energy In the receiver mode of operation Q923 transistor is turned on Also bias voltage is applied to Q101 Q102 Q103 Q106 Q101 is a 27MHz RF input amplifier and any excessive input signal is limited by diode D101 CB receiver is dual conversion super heterodyne type with the first 10 605MHz the second IF 455KHz Receiver is separated to blocks 1 st IF section and 2 nd IF section The PLL synthesizer supplies 1 st local frequency 16 270MHz 16 710MHz The amplified 27MHz is mixed With the provide 1 st local frequencies Q102 Q103 mixes the incoming RF signal to generate 1 st IF signal The resulting first IF is 10 695MHz 0102 and 0103 is the first converter and 10 695MHz is sharply filtered by L108 and crystal filter CF101 The first IF is again mixed with a second local oscillator of 10 24MHz With th
21. F Gain Optional MIC Gain Max generator set to 1 KHz to the microphone Connect the modulation meter through the RF attenuator to the ANT Connector Adjust the audio signal level to obtain by 50 modulation When you increase the audio signal by 20 dB the modulation should not exceed 95 Modulation Figure 3 Function AM or FM Mode Connect RF Power Meter to transmitter CB ANL Off DX EXT ANT connector on the frequency is Mic Transmit No Mod set Figure 2 27 185MHz Volume Optional 300 Hz on Squelch Optional the Frequency RF Gain Optional Counter MIC Gain Optional 3 AM Modulation Adj Connection the audio RV231 85 9590 4 FM Deviation Adj Connection the audio RV401 1 8KHz Channel amp Frequency generator set to 1 KHz to the 2 0KHz 19CH 27 185MHz microphone MIC Transmit Connect the modulation meter Function FM Mode through the RF attenuator to CB ANL Off DX the ANT Connector Adjust Volume Optional the audio signal level to obtain Squelch Optional by 1KHz deviation RF Gain Optional When you increase the audio MIC Gain Max signal by 20 dB the deviation should not exceed 2 0KHz deviation Figure 3 5 TX Signal Meter Adj Connected through Dummy RV571 Adjust for 4 Channel amp Frequency load to RF Power Meter watts RF 19CH 27 185MHz MIC Transmit Function FM Mode CB ANL Off DX Volume Optional Squelch Optional RF Gain Optional MIC Gain
22. ISTOR KRC111S SOT 23 KEC SMD 3 10202 0502 0962 ECO050412 01 114 CHIP TRANSISTOR KRC1128 SOT 23 KEC SMD 4 0122 0152 0154 0913 115 CHIP TRANSISTOR 15045 SOT 23 KEC SMD 4 10164 0233 0912 0924 0151 0181 0182 0183 0234 116 CHIP TRANSISTOR KTC3875S SOT 23 KEC SMD B ayia 09210923 Q931 E Q101 0161 0162 Q301 Q302 117 CHIP TRANSISTOR KTC3880S SOT 23 KEC SMD 118 DIODE ZENER Z02W5 1V SOT 23 KEC SMD 1 02481 119 DIODE ZENER Z02W5 6V SOT 23 KEC SMD 1 02931 120 DIODE ZENER Z02W8 2V SOT 23 KEC SMD 1 102921 121 DIODE SI CHIP KDS181 SOT 23 KEC SMD 1 D401 D102 D103 D105 D171 D180 122 DIODE SI CHIP KDS184 SOT 23 KEC SMD 13 0181 0233 0571 0572 0741 ECO050412 01 0742 0921 0961 123 DIODE SI CHIP KDS226 SOT 23 KEC SMD 1 p101 124 DIODE VARICAP KDV251S SOT 23 KEC SMD 2 D301 D302 125 IC PLL LC7152NM SANYO YANG WON SMD 1 301 126 AMP KIA358F KEC SMD 1 C102 127 OP AMP KIA4558F KEC SMD 1 401 128 IC FM IF TK14489V TOKO SMD 1 IC101 MAIN PCB MANUAL ASS Y 129 FILM RESISTOR 2 2 1 2W 5 ST MINI MAN 1 6712 130 FILM RESISTOR 10 1 2W 5 ST MINI MAN 1 R921 NAME 8 DESCRIPTION VENDOE CODE VENDOR Location NO REMARKS 131 FILM RESISTOR 470 1 2W 5 ST MINI MAN 2 R953 R954 ECO050418 03 132 FILM RESISTOR 4 7K 1 2W 5
23. MOD T2 FINE FINE MAN 1 T201 050509 02 154 COIL RF FREE 27MHz TX1 FINE FINE MAN 2 L701 L702 155 FT COIL 37MHz TX TX2 FINE FINE MAN 1 L703 156 27MHz B RX1 FINE FINE MAN 1 L101 157 COIL 27MHz RX 7 RX2 FINE FINE MAN 1 L107 158 FT COIL 10 7MHz RX B RX3 FINE FINE MAN 1 L108 159 COIL DETECTOR 455KHz RX4 FINE FINE MAN 1 L109 160 455 2 5 FINE FINE MAN 1 L112 161 COIL 16 5MHz VCO VCO1 FINE FINE MAN 1 L301 162 15MHz TX RX VCO2 FINE FINE MAN 1 L302 163 COIL AXIAL 1 5UH LALOSTR1R5K MAN 2 L102 L106 164 COIL AXIAL 6 8UH LALO3TB6R8K MAN 1 L706 165 SPRING 2 5X0 8X7T R 0 11UH FINE FINE MAN 1 L704 166 SPRING 4X0 5X6T R FINE FINE MAN 1 L712 167 SPRING 4X0 5X7T R FINE FINE MAN 1 L713 168 SPRING 4X0 5X10T R FINE FINE MAN 1 L714 169 SPRING 6X0 8X5T R 0 225UH FINE FINE MAN 1 L711 170 COIL SPRING 5X0 6X13 5T R 0 5UH FINE FINE MAN 1 L707 171 CORE SPRING 5 5TX0 45XM5E X2 3 0 17UH FINE FINE MAN 3 L103 L104 L105 172 COIL CHOKE 6UH BOBBIN CORE FINE FINE MAN 1 L201 173 TRANSISTOR KTC1006 KEC MAN 1 Q703 174 TRANSISTOR KTA1241 KEC MAN 3 0221 0951 0952 050412 01 175 DIODE 1N4004T R 400V 1A MAN 2 D232 D901 176 DIODE 1N60 MAN 1 D161 177 CRYSTAL 10 240MHz 32PF 30PPM HC 49 U D TRON D TRON MAN 1 X101 NAME 8 DESCRIPTION CRYSTAL 4 50MHZ VENDOE CODE 12PF 30PPM HC 49U D
24. PH 2PIN TO OPEN UL1007 26 L 200mm FINE FINE MAN 1 J204 ESCUTCHEON ASS Y 3 PCB VOLUME 1LAYER CAPITAL MAN 1 4 VR B10K A10K SJ093D 15H 10F B10K SA10K SEJIN MAN 1 VR101 5 VR B50K B50K SJ093D 15H 10F B50K B50K 5 SEJIN MAN 1 VR102 6 FILM RESISTOR 10K 1 8W 5 ST MAN 1 R400 7 SW ROTARY SJ PS2101 20SK SEJIN SEJIN MAN 1 SW811 8 AXIAL 6 8UH LALO3TB6R8K MAN 4 L501 L502 L504 L506 9 16PIN PH 16A 180C FINE FINE MAN 1 J101 10 WIRE HARNESS PH 16PIN 2 UL1007 26 L 50MM FINE FINE MAN 1 J101 9102 11 WIRE HARNESS PH 6PIN TO OPEN UL1007 26 L 70MM FINE FINE MAN 1 J502 12 CONNECTOR SOCKET N 16 6 RPCB M SAMWOO MAN 1 J501 13 HEAT SINK TUBE diameter 4 mm x 15mm MAN 6 050321 01 LCD PCB ASS Y 14 PCBLED 1 LAYER CAPITAL MAN 1 15 PCB DISPLAY FR 4 R 1 CAPITAL MAN 1 050809 01 16 CHIP RESISTOR 1K 1 16W 5 T 1608 PHILIPS SMD 1 R810 17 CHIP RESISTOR 10K 1 16W 595 T 1608 PHILIPS SMD 5 R805 R806 R807 R811 R814 18 RESISTOR 100 1 16W 5 T 1608 PHILIPS SMD 1 R804 19 CHIP RESISTOR 1M 1 16W 5 T 1608 PHILIPS SMD 1 R803 20 CHIP RESISTOR 2 2K 1 16W 5 T 1608 PHILIPS SMD 5 R832 R833 R834 R835 R836 21 CHIP RESISTOR 220K 1 16W 5 T 1608 PHILIPS SMD 1 R808 R812 R816 R831 R851 R852 22 CHIP RESISTOR 47K 1 16W 5 T 1608 PHILIPS SMD 11 R853 R854 R857 R859 R862 R864 23 CHIP CERAMIC 0 01UF 1608 PHILIPS SMD 2 806 807 24 CHIP CERAMIC 1UF 1608 PHILIPS SMD 1 C805 25 CHIP CERAMIC 68PF 1608 PHILIPS SMD
25. R204 22 201 47 16 25 0221 241 C217 1000 16 R C207 1000 16 10 0155 less que 8169 220 112 5 8133 47 16 10 163 39K yo R134 100 qo R139 SQUELCH gt VCO TEST 8300 47K R304 22K 16323 R309 8305 58805 100K 22k can REG B4L8 2V 1 102 5 8164 C162 103P 0161 KTC3880S 38805 470 479 0164 15045 RIS 82K R234 C233 47 16 0233 E MOD bi 15045 R233 0233 100 0518 C231 TK 015 R2234 7K CTRL 221 C213 M INE 222 0222 722 16 1202 EXT SKIS 3518 1201 00 16 SPK201 SPEAKER 1 2 0 1205 J204 2PIN 1203 S METER 515 206 RV572 100 8 5 ADJ 39412505 oe one R316 N C TN C C506 0301 C324 Top REG B4LB 2V 25 KRCIOIS 0312 10325 er 9302 _ 7 38805 R701 0742 R742 KDS184 1 5K R313 D302 56K _KDV251S lt KRCIOI
26. RUBBER same as TCB880 Hankyung SCREW 3 81 Taptite Black BH same as TCB880 Bonso SCREW 5 121 18 ZN PLATING TH same as TCB880 Bonso STAR WASHER S 3 NI PLATING type same as TCB880 Bonso CO NI gt 5 STAR WASHER L 5 NI PLATING type same as TCB880 Bonso POWER CODE PACKING ASS Y 2PIN RECEPRACLE ASS Y FINE PM OWNER S MANUAL GIFTBOX SWIE 2 0T INNER BOX A SWIE 2 0T BROWN INNER BOX B SWIE 2 0T BROWN WARNING LABEL CODE 39 SERIAL NO STICKER OUT BOX DWIE 7 0T SILICA GEL 1g n Qo OPP TAPE 50MM SECTION4 MECHANICAL DISASSEMBLY xp 2 62 ary a x2 KF 2 e N L2 79 X S gt xx ibo Qe ee 3 69 ese 53 gt A DESCRIPTION QTY REMARK Upper cover SPC 0 75t Black Bottom cover SPC 0 75t Black Main body EGI 1 01 Bracket Set SPC 1 6t Blacke Key PCB 1 6t Main PCB 1 6t Ch knob ABS Black Vol knob ABS Black gt Nut for Mic connector Washer for Mic connector D Spring SK5 0 24 Zn plating Dual knob ABS Black Ring nut BsBm Ni plating Bezzel
27. S 0313 KRCIOIS 0305 KRCIOIS 0502 KREINS Q742 KTC38758 vco SHIELD CAN KTC3880S ure i 1 0572 RV571 Kosi84 100K8 TX S METER ADJ S METER 8573 cs73 572 0571 K 730 2 4736 C724 220P R712 220 20 1712 6L 714 1701 239 A Sw 1228 ANT 0704 2562078 67226720 727 22 725 6726 72916731 733 6734 47 T 330P 330P T330P TIOOP 11008 TIBOP R713 47K 1 24 736 00 8961 AM FM 22K D W R962 47K KREMS 0962 0961 KRCTI0S C406 B2P E R405 2M M G OUT M d IC401 A K A4558F C413 R415 104P 47K RV401 22KB REG B L5 IV 1FRONT PCB F PCB to MAIN PCB to PCB SOLDERING REG 8315107 ee 0924 15045 REG B LB 2V KTC3875S R804 100K s 10K icon 10 16 0802 C805 E IKRCIO4S 7 10K X 1 241 923 TrosP ILD Q921 38755 REG_B L5 1V 1 IC401 8 R821 10K 10K Rerum oe MAIN 8823 4 0821 C405 li 0184 KRCHOS TX_B oF MAIN_ B _ 15 1 1 RF GAIN 12 lt 50 1 oa 50 2 0 7 00 o
28. TRON VENDOR D TRON Location NO REMARKS FILTER CRYSTAL 101 08 10 695 2 49 T 3L D TRON D TRON FILTER CERAMIC LT455HTW D TRON D TRON 050525 02 JACK MINI SKJS 206 SEKWANG SEKWANG JACK DC SKJS 3518 SEKWANG SEKWANG WAFER 2PIN PH 2A 180C FINE FINE WAFER 6PIN PH 6A 180C FINE FINE WAFER Mechanical PARTS 16PIN PH 16A 180C FINE FINE COVER ASS Y 1 BOTTOM COVER COATING 0 75t Hankyung UPPER COVER SPC BLACK COATING 0 75t Hankyung BRACKET SPK EGI 1 0t COATING same as TCB880 Hankyung For speaker FELT SPK 65 0 3t BLACK Hankyung For speaker FELT COVER 8 133 0 3t BLACK Hankyung For bottom cover amp upper coveradhesive location side SCREW Mach M3 8L TAPTITE BLACK BH same as TCB880 ECO 050319 02 Bonso Bracket spk mounting mamn DOUy DUUUTITI amp U SCREW Mach M3 8L TAPTITE BLACK BH same as TCB880 same as item 6 Bonso ma ntinn CUSHION 20 24 4 0t EVA SPONGE BLACK ESCUTCHEON ASS Y same as TCB880 ECO 050328 07 Hankyung gt For upper cover adhesive location center 9 ESCUTCHEON ABS BLACK Bonso Front case plastic 10 BEZEL ACRYL CLEAR Bonso 11 DOUBLE TAPE BEZEL
29. ceive Volume Optional Squelch Optional RF Gain Optional Mic Gain Optional 2 TX VCO voltage Adj DC voltmeter to VCO L301 1 5 2 0 V DC Channel amp Frequency Test point Figure 1 1CH 26 956 MHz Mic Transmit No Mod Volume Optional Squelch Optional RF Gain Optional Mic Gain Optional DC Voltmeter amp Oscilloscope VCO TP Figure 1 5 2 Transmitter Section 5 2 1 Test Equipment Required RF Power Meter e 50 ohms load non inductive RF attenuator 30dB Oscilloscope e Audio generator DC power supply 13 2V 3A e Spectrum analyzer Frequency counter Coupler Modulation meter 5 2 2 Alignment Procedure Step Setting Connection Adjuster Adjust for 1 Power Connect dummy load and 1302 Maximum Channel 19CH Power Meter to the EXT ANT L701 indication on Function AM or FM Mode connector on set Figure 3 L702 the Power CB ANL Off DX L703 Meter 4 0W MIC Transmit If indication is Volume Optional not in 4W Squelch Optional range ACP RF Gain Optional Adjustment R MIC Gain Minimum V911 2 Frequency Adj Connect dummy load and CT302 Be sure that Channel amp Frequency 19CH 26 956 MHz Frequency Counter through Coupler to RF Power Meter the indication of the Channel amp Frequency 19CH 27 185MHz MIC Transmit Function AM Mode CB ANL Off DX Volume Optional Squelch Optional R
30. e 10 240 2 signal IC101 FM IF IC converts the incoming signals to generate 2 nd IF signal and recovered audio signals 2 nd IF is filtered by a razor sharp ceramic filter CF101 coupled The 455KHz signal from the 2 nd IF filter was amplified and limits internally After amplification the signals fed to the quardrature detector loop L109 Then could see the recovered signals Pin 11 of IC101 With the amplitude of recovered signals Q151 serves as an amplifier AM signals from the Pin 6 of IC101 were tapped with C161 and amplified two stage amplifier 0161 Q162 Q161 is a first 455KHz amplifier and the Q161 being the last amplifier D106 is detector diode witch produce audio signal as well as negative DC voltage for AGC action The negative voltage also provides forward biasing to the emitter of ANL clipping transistor Q164 The biasing voltage has a time constant determined R174 and C176 Therefore any sharp negative going pulse from D161 will back bias Q164 and clipped The way to recover the AM information audio is envelope detector 5 Test Equipment Setup and Alignment Instructions 5 1 General Section 5 1 1 Test Equipment Required DC power supply 13 2V 3A DC Voltmeter or Oscilloscope attenuator 30dB 5 1 2 Alignment Procedure Step Setting Connection Adjuster Adjust for 1 RX VCO voltage Adj DC voltmeter to VCO L301 1 5 2 0 V DC Channel amp Frequency Test point Figure 1 1CH 26 956 MHz Mic Re
31. er and Distortion MIC Receive Distortion Meter and SINAD Minimum Function FM Mode Meter across EXT SPK jack Reduce output CB ANL Off DX with 8 ohm Dummy from SSG SSG 27 185MHz Load Figure 4 until the audio 67dBm 1 5KHz Dev output Volume Optional becomes about Squelch Minimum 20dB SINAD RF Gain Maximum 3 Squelch Adj Connect RF Signal Generator RV131 Adjust until Channel amp Frequency to EXT ANT Connector the audio 19CH 27 185MHz Connect AC Level Meter and output MIC Receive Distortion Meter and SINAD appears 4 RX Signal Meter Adj Channel amp Frequency 19CH 27 185MHz MIC Receive Function FM Mode CB ANL Off DX SSG 27 185MHz 1KHz 62dBm 1 5KHz Dev Volume Optional Squelch Maximum RF Gain Maximum Connect RF Signal Generator to EXT ANT Connector Connect AC Level Meter and Distortion Meter and SINAD Meter across EXT SPK jack with 8 ohm Dummy Load Figure 4 RV572 Adjust for 5 9 on the signal meter DC Power Supply SSG 8 Ohm Dummy Load Figure 4 AC Level Meter Distortion Meter SINAD Meter SECTION3 PART LIST ELECT Parts NAME amp DESCRIPTION VENDOE CODE VENDOR Location NO REMARKS COVER ASS Y 1 SPEAKER 66mm 66AR000 8P 4K1 1 ASAHI ASAHI MAN 1 SPK201 2 WIRE HARNESS
32. es 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 9 10 of IC301 Passing the phase detector output closes the feedback loop through an active low pass filter and using the output to control the VCO frequency through varicap diode D301 Under locked conditions both of phase detector input signal must be identical at 2 5KHz The VCO frequency is then given by Receiver Fvco N 0 005 MHz OR Fvco 0 005 X N MHz Transmitter 0 0025 MHz OR Fvco 0 0025 XN MHz Since N is an integer the VCO frequency can be stepped up with in receiver mode 5KHz and transmitter mode 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 Output Frequency Doublers Output Frequency Transmit CH 1 13 4825 MHz 26 965 MHz Transmit 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 sample percentage accuracy Note that the reference frequency of 5KHz receiver and 2 5KHz transmitter is obtained by dividing the
33. he required voltage and temperature range 4 5 Description of other Circuits 4 5 1 Transmitter A RF Amplification carrier frequencies are obtained at the output of doublers amplifier Q701 and turning L701 L702 The input of VCO frequencies 13MHz is selected at the doublers output which creates the necessary 27MHz The output of doublers amplifier 0701 is fed through turning IFT coil L701 L702 to the base of pre driver amplifier 0702 It s output 27MHz is coupled to RF driver amplifier 0703 low level class C power amplifier Driver Q703 supplies the necessary power gain to operate RF final Q704 at the maximum efficient The output of Q704 is supplied to the antenna through L C turning circuit B Circuit for Suppression of Spurious Radiation The turning circuit between the output of final amplifier Q704 and antenna 4 stage network C722 C723 C724 L711 C725 C726 L712 C729 C731 L732 C732 C733 C734 L714 C735 serves as a spurious radiation suppressor This network also servers to match the impedance between TX power amplifier Q704 and the antenna C Circuits for Limiting Power After finished all alignment the constant voltage supply circuit limits the available power 4W or slightly less RV911 and corresponding three transistor control supply voltage of RF power amplifier When power low switch function Q914 changed the supply voltage Tune all the trimming parts for maximum indication of RF
34. jection 60 dB M 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 Introduction 4 2 Basic Synthesis Scheme 4 3 Descriptions of Each Block 4 3 1 Introduction 4 3 2 Reference Frequency 4 3 3 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 General Section 5 2 Transmitter Section 5 3 Receiver Section 1 1 1 1 2 OM SRS Receiver Display 40 Channels and other functions indication
35. l bit is required at Pin 8 of IC801 to allow the ROM to recognize the status TX or RX During transmit the push to talk switch makes Pin 8 ground with BRT Q802 PLL IC works under transmit status The programmable divider output fed to the phase detector for compare with the 2 5KHz reference frequency IC301 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 witch compares the phase of the reference signal with 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 low pass filter output signal of IC301 is filtered and fed to varicap D301 control the VCO frequency 4 3 6 Transmitter Receiver Buffer AMP Output signal of Q301 is fed into the buffer amplifier Q302 L302 to generate TX carrier frequency and 1 st local frequencies 4 3 7 Transmitter Doublers The output signal of Q302 L302 goes to an amplifier with tuning circuit Q701 L701 1702 which doubles incoming 13MHz signals 4 3 8 Switching of Turning Capacitor in VCO The VCO circuit must tune with a wide range of frequencies 13 4825MHz 13 7025MHz for transmitter and 16 27MHz 16 71MHz for receiver To comply above range of VCO the tuning capacitance should switch for transmission The tuning circuit consists with L301 C
36. power meter and adjust RV571 to make 4W indication of RF power meter After finishing the above adjustments check the RF power meter reading is changed 1W under LOW state The turning is adjustment so that the actual power is from 3 8W to 4 0W There are no other additional controls for adjusting the TX output power D Modulation Control Modulation of the RF is a process that begins with the audio picked up by the microphone FM The microphone input is fed to mic audio amplifier IC401 that drives modulation vricap diode D302 in the VCO circuit RV401 limits the incoming modulation audio levels to inhibit over modulation While reading the modulation factor on the modulation analyzing equipment adjustment RV401 shall not exceed 2 0KHz deviation AM Modulation signals are filtered with RC network and goes to the audio power amplifier IC201 in to make normal signal level to achieve wanted modulation IC201 drives T201 which is a combination AF output modulation transformer During transmit one of the secondary windings of T201 is tied between the 13 2V DC supply and the collectors of RF driver Q703 and RF power amplifier Q704 As the audio passes through T201 it causes the collector supplies of Q703 and Q704 to vary with audio producing an AM signal at carrier frequency To avoid over modulation of the carrier a protection of the modulating signal is fed back from the T201 through the AMC circuit Q233 and 0234 to control the gain of I
37. t Hankyung 1 31 CORDSTOPPER PP BLACK same as TCB880 Hankyung 1 Wire stopper 32 SCREW MACH M3 10L Black BH same as TCB880 ECO 050412 02 Bonso 3 TR mounting NAME 8 DESCRIPTION SCREW Mach 3 8L TAPTITE Black BH same as TCB880 same as item 6 VENDOE CODE Bonso VENDOR Location NO Main PCB Main body mounting REMARKS NUT M3 SS41 same as TCB880 Bonso TR mounting SPRING WASHER M3 same as TCB880 Bonso TR mounting HEAT SINK AL 2 0t same as TCB880 Hankyung BUSH NLLON66 GRASS 15 same as TCB880 Hankyung For TR ANT TERMINAL SPTE 0 2t same as TCB880 Hankyung For Antenna MICA 0 6t same as TCB880 Hankyung For TR TX SHIELD CAN 1 SPTE 0 3t Hankyung For Main PCB location lower TX SHIELD 2 SPTE 0 3t Hankyung For Main PCB location upper VCO SHIELD CAN SPTE 0 3t same as TCB880 Hankyung For Vco SHIELD COVER SPTE 0 3t ECO 050302 01 Hankyung For TX shield can 2 Cu Tape 1 Cu 49 9 0 1t ECO 050328 05 Bonso For TX shield can 1 Cu Tape 2 Cu 77 15 0 1t ACCESSORY ECO 050328 05 Same as TCB880 Bonso For TX shield can 1 1 MIC ASS Y same as TCB880 Hankyung BRACKET SET Hankyung STUD BOLT ABS M6 8L BLACK same as TCB880 Hankyung BRACKET MIC 505304 1 0t same as TCB880 Hankyung PACKING RUBBER _ PACKING
38. te at RX Mode MIC AF Path at AM Mode TK144889V KIA358F KIA7217AP LC7152NM KIA4558F TMP87PP21DF 24WC02 Manufacture Information SANYO TOKO TOSHIBA ATMEL KEC SANYO KEC TOSHIBA ATMEL IF IC AGC Squelch Control AF Power Amplifier PLL FM TX AF CPU EEPROM KEC Co LTD SANYO Semiconductor Co LTD TOKO Inc Toshiba Semiconductor Co LTD ATMEL Co LTD 4 Description of Frequency Determining and Stabilizing Circuit 4 1 Introduction The Frequencies for transmitter and receiver first local frequencies are all derived from a signal 4 5 crystal by means of a phase locked loop PLL 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 455KHz Transmit the VCO of the PLL operates 13 4825MHz CH1 to 13 7025MHz 40CH The VCO frequency goes to the doublers circuit 0701 L701 L702 with doubles the frequency to generate 26 965MHz CH1 to 27 405MHz 40CH Q701 Doublers To transmitter 13 4825MHz CHI 26 965MHz 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 Q102 Q103 4 2 Basic Synthesis Scheme The crystal frequency 4 5MHz is divided by 1800 tim
39. tti SERVICE MANUAL MULTI CHANNEL AM FM TRANSCEIVER TCB 770 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 A TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS SECTION 3 PARTLIST 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 96 MHz 27 99125 MHz G Operating mode Frequency Control PLL Synthersizer N Frequency Tolerance 0 002 E Operating Temperature Range 10 to 55 Microphone Plug in Type 113 2V DC 15 140 W x 186 L x 37 990 g Antenna Connector Power Output Duty cycle 10 4 Watts 13 8V DC A Modulation 85 to 95 FM 1 8KHz x 0 2KHz M Frequency Response 300 2 to 3000Hz L Output Impedance 50ohms Unbalanced T Suppression More than 36dBm R Current Drain Full Mod 1 6A Max Receiving System Dual conversion superheterodyne IF Frequencies Double Conversion 1st 10 695MHz 2nd 455KHz Sensitivity 0 7uV for 10dB S N N in AM Mode E 10 5uV for 20dB SINAD FM Mode Audio Output Power 2 0W 8 Ohm z Audio Distortion Less then 896 1KHz Image Re

TCB-770 service manual_050818

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