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Abell TH-308GB UHF, Servise Manual

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Abell TH-308GB UHF Servise Manual Download Page 6

TH-308GB UHF SERVICE MANUAL 

- 5 - 

 

 

4

．

Taking care not to cut the speaker lead

⑤

, open the chassis and case assembly. 

 

 

Seperating the chassis from the unit 

1

．

Remove the eleven screws

⑥

. 

2

．

Remove the solder from the antenna terminal using a soldering iron then lift the unit off

⑦

. 

3

．

Remove the two screws

⑧

and remove the antenna connector. 

Note: When fixing the unit in the chassis, be sure to solder the antenna terminal. 

 

Summary of Contents for TH-308GB UHF

Page 1: ...o Ltd TH 308GB UHF SERVICE MANUAL V1 0 Contents GENERAL 1 REALIGNMENT 2 DISASSEMBLY FOR REPAIR 3 CIRCUIT DESCRIPTION 4 PARTS LIST 5 EXPLODED VIEW 6 PACKING 7 ADJUSTMENT 8 PC BOARD VIEWS TX REX UNIT X57 6030 XX 9 SCHEMATIC DIAGRAM 10 SPECIFICATIONS 11 ...

Page 2: ...is applies to all parts components kits or chassis If the part number is not known include the chassis or kit number of which it is a part and a sufficient description of the required component for proper identification PERSONAL SAFETY The following precautions are recommended for personal safety DO NOT transmit until all RF connectors are verified secure and any open connectors are properly termi...

Page 3: ...tings by means of the FPU through the RS 232C port Manufacture Mode Use this mode to realign the various settings through the RS 232C port during manufacture work 2 How to enter each mode MODE PROCEDURE User Mode Power ON PC Mode Connect to the IBM PC compatible machine and controled by the FPU 3 Setting acquainted User Mode PC Mode Manufacture Mode ...

Page 4: ...Turn counterclockwise until a click sounds to switch the transceiver OFF Rotate to adjust the volume level PC MODE Preface The transceiver is programmed by using a personal computer programming interface provided by ABELL and programming software Pic 1 shows how the devices work Connection procedure 1 Connect the TH 308G to the personal computer with the interface cable CNX 02 2 When data is trans...

Page 5: ...PC If data is transferred to the transceiver from a personal computer with software provided by Abell the destination data basic radio information for each set can be modified Normally it is not necessary to modify the destination data because their values are determined automatically when the frequency range frequency type is set The values should be modified only if necessary Data can be program...

Page 6: ...ssembly Seperating the chassis from the unit 1 Remove the eleven screws 2 Remove the solder from the antenna terminal using a soldering iron then lift the unit off 3 Remove the two screws and remove the antenna connector Note When fixing the unit in the chassis be sure to solder the antenna terminal ...

Page 7: ...ICE MANUAL 6 CIRCUIT DESCRIPTION 1 Frequency configuration The receiver utilizes double conversion The first IF is 21 70MHz and the second IF is 450KHz The first local oscillator signal is supplied from the PLL circuit ...

Page 8: ...spurious signals 3 IF amplifier The first IF signal is amplified by Q48 and then enters IC10 FM prcessing IC The signal is heterodyned again with a second local oscillator signal witin IC200 to create a 450KHz second IF signal The second IF signal is then fed through a 450KHz ceramic filter CF2 to further eliminate unwanted signals before it is amplified and FM detected in IC200 4 AF amplifier The...

Page 9: ...ltered through a low pass filter and control the oscillator frequency through VCO 2 VOC The operating frequency is generated by the oscillator with Q3 The control voltage is applied to the varactor diodes D27 and D28 to rectify the oscillator frequency The RX pin is set low in transmit mode Q30 and Q20 are turned off to adjust current frequency to transmit frequency 3 UNLOCKED DETECOR If a pulse s...

Page 10: ...k and a transmit receive switching circuit before it is passed to the antenna terminal The transmit receive switching circuit is comprised of D17 D19 D1 and D19 turned on conductive in transmit mode and off isolated in receive mode 5 Terminal protection circuit When the thermistor TH2 reaches about 80 C the protection circuit turns on Q50 to protect transmitting final amplifier Q29 from the over h...

Page 11: ... R56 R75 R254 11 2 2K 0603 5 2 R03 R242 12 3K 0603 5 1 R143 13 3 3K 0603 5 1 R277 14 4 7K 0603 5 4 R01 R12 R139 R016 15 5 6K 0402 5 3 C45 C46 R73 16 5 6K 0603 5 2 R24 R43 17 6 8K 0603 5 1 R77 18 8 2K 0603 5 1 R126 19 10K 0603 5 11 R10 R19 R67 R78 R79 R118 R134 R138 R158 R165 R263 20 20K 0603 5 2 R36 R87 21 22K 0603 5 2 R41 R135 22 33K 0603 5 2 R47 R50 23 47K 0603 5 3 R63 R98 R132 23 56K 0603 5 1 R...

Page 12: ...F 0402 C0G 5 16V 1 C261 47 220PF 0402 X5R 10 16V 3 C268 C329 C331 48 470PF 0402 X5R 10 16V 6 C11 C32 C116 C241 C245 C337 49 680PF 0402 X5R 10 16V 1 C56 50 1000PF 0402 X5R 10 16V 5 C60 C70 C86 C008 C009 51 3300PF 0402 X5R 10 16V 1 C55 52 3900PF 0402 X5R 10 16V 5 C79 C80 C81 C82 C95 53 5600PF 0402 X5R 10 16V 2 C44 C47 54 0 01UF 0402 X5R 10 16V 5 C14 C98 C109 C250 C342 55 0 018UF 0603 X5R 10 16V 1 R2...

Page 13: ...d LED 1 LED1 72 ISR154 400 SOD 106 DIODE 1 D24 Triode 73 2SA1362 GR SOT 23 TRANSISTOR 1 Q39 74 2SC4617 SOT 416 TRANSISTOR 2 Q13 Q14 75 2SK1824 SOT 416 FET 2 Q15 Q002 76 DTA114YE SOT 416 TRANSISTOR 1 Q2 77 DTA114EE SOT 416 TRANSISTOR 1 Q02 78 DTC114EE SOT 416 TRANSISTOR 5 Q01 Q8 Q10 Q31 Q33 79 DTC114TE SOT 416 TRANSISTOR 1 Q50 80 FMMT717 SOT 23 TRANSISTOR 1 Q001 Fuse 81 3 0A 1206 R429003 3A 32V 1 F...

Page 14: ...23 R35 R46 R125 R249 R214 13 1 2K 0603 5 1 R240 14 1 8K 0603 5 1 R238 15 2 2K 0603 5 1 R241 16 2 7K 0603 5 1 R245 17 3K 0603 5 1 R58 18 3 3K 0603 5 7 R13 R104 R170 R172 R176 R235 R278 19 3 9K 0603 5 1 R237 20 4 7K 0603 5 3 R9 R230 R231 21 5 6K 0603 5 1 R169 22 6 8K 0603 5 1 R33 23 8 2K 0603 5 3 R55 R171 RY3 24 10K 0603 5 5 R8 R31 R93 R185 R266 25 12K 0603 5 1 RY2 26 15K 0603 5 1 R140 27 18K 0603 5...

Page 15: ...V 3 C2 C286 C350 51 9PF 0402 C0G 0 1pF 16V 2 C347 C296 52 10PF 0402 C0G 0 5pF 16V 3 C7 C37 C303 53 12PF 0402 C0G 5 16V 2 C36 C285 54 18PF 0402 C0G 5 16V 1 C69 55 20PF 0402 C0G 5 16V 1 C368 56 22PF 0402 C0G 5 16V 1 C316 57 33PF 0603 C0G 5 16V 1 C352 58 33PF 0402 C0G 5 16V 2 C9 C29 59 30PF 0402 C0G 5 16V 2 C313 CY23 60 56PF 0402 C0G 5 16V 1 C314 61 82PF 0402 C0G 5 16V 1 C369 62 100PF 0402 C0G 5 16V ...

Page 16: ...0 16V 3 C115 C321 C322 81 4 7UF Atype 20 6 3V 3 C8 C324 C325 82 10UF Atype 20 6 3V 4 C327 C332 C335 C359 83 100UF Ctype 20 6 3V 1 C334 Inductance 84 BLM11A601S BLM18AG601SN1D 0603 Bead 600R 5 L4 L40 L41 L44 L45 85 BLM21PG300SN1D 0805 Bead 3 L35 L42 LU7 86 LQG11A2N7S LQG18HN2N7SJ00 0603 High frequency Multilaminated Induction 1 LY18 87 LQG11A3N3S LQG18HN3N3S 0603 High frequency Multilaminated Induc...

Page 17: ...98 MLF1608A3R3K 0603 Low frequency Multilaminated Induction 5 L2 L8 L48 L65 L66 99 MLF1608E100K 0603 Low frequency Multilaminated Induction 1 L15 100 0 4 φ1 6 3TR P type AIR CORE COIL pin E 7 L6 L18 L20 L33 L34 L59 L60 101 0 4 φ1 6 4TR P type AIR CORE COIL pin E 3 L7 L61 L62 102 0 4 φ1 8 4TR P type AIR CORE COIL pin E 1 L63 103 0 4 φ1 6 7TR P type AIR CORE COIL pin E 1 L56 104 NC 0402 1 LY3 Diode ...

Page 18: ...IC 5V 1 IC4 124 TA31136FN TSOP16 IF SYSTEM 1 IC17 125 GP460S1 GP214D TSOP16 PLL IC 1 IC3 Crystal 126 12 8MHz 3 2 5mm NT5032SC 1 X1 127 PCB TH308GB PSM5 0 0501 072101 V30 X58 1 Remark 1 Rectification on QY4 for RD01MUS1 and Q29 for RD07MVS1 updated on 2007 1 12 Pre rectification After rectification Part Numb er Specification Package Description Specification Package Description QY4 2SK3078 SOT 89 3...

Page 19: ...6 R75 R254 12 2 2K 0603 5 2 R03 R242 13 3K 0603 5 1 R143 14 3 3K 0603 5 1 R277 15 4 7K 0603 5 4 R01 R12 R139 R016 16 5 6K 0402 5 2 C45 C46 17 5 6K 0603 5 2 R24 R43 18 6 8K 0603 5 1 R77 19 8 2K 0603 5 1 R126 20 10K 0603 5 11 R10 R19 R67 R78 R79 R118 R134 R138 R158 R165 R263 21 18K 0402 5 1 R73 22 20K 0603 5 1 R87 23 22K 0603 5 2 R41 R135 24 33K 0603 5 2 R47 R50 25 47K 0603 5 3 R63 R98 R132 26 68K 0...

Page 20: ...V 1 C261 49 220PF 0402 X5R 10 16V 2 C268 C329 50 470PF 0402 X5R 10 16V 6 C11 C32 C116 C241 C245 C337 51 680PF 0402 X5R 10 16V 1 C56 52 1000PF 0402 X5R 10 16V 5 C60 C70 C86 C008 C009 53 3300PF 0402 X5R 10 16V 1 C55 54 3900PF 0402 X5R 10 16V 5 C79 C80 C81 C82 C95 55 5600PF 0402 X5R 10 16V 2 C44 C47 56 0 01UF 0402 X5R 10 16V 5 C14 C98 C109 C250 C342 57 0 018UF 0603 X5R 10 16V 1 R29 58 0 022UF 0402 X5...

Page 21: ... LED 1 LED1 75 ISR154 400 SOD 106 DIODE 1 D24 Triode 76 2SA1362 GR SOT 23 TRANSISTOR 1 Q39 77 2SC4617 SOT 416 TRANSISTOR 2 Q13 Q14 78 2SK1824 SOT 416 FET 2 Q15 Q002 79 DTA114YE SOT 416 TRANSISTOR 1 Q2 80 DTC114EE SOT 416 TRANSISTOR 5 Q01 Q8 Q10 Q31 Q33 81 DTC114TE SOT 416 TRANSISTOR 1 Q50 82 DTA114EE SOT 416 TRANSISTOR 1 Q02 83 FMMT717 SOT 23 TRANSISTOR 1 Q001 Fuse 84 3 0A 1206 R429003 3A 32V 1 FU...

Page 22: ...8 R20 R22 R23 R35 R46 R125 R249 R214 13 1 2K 0603 5 1 R240 14 2 2K 0603 5 1 R241 15 2 7K 0603 5 1 R245 16 3K 0603 5 1 R58 17 3 3K 0603 5 8 R13 R104 R170 R172 R176 R235 R238 R278 18 3 9K 0603 5 1 R237 19 4 7K 0603 5 3 R9 R230 R231 20 5 6K 0603 5 1 R169 21 6 8K 0603 5 2 R33 R55 22 8 2K 0603 5 2 R171 RY3 23 10K 0603 5 5 R8 R31 R93 R185 R266 24 12K 0603 5 1 RY2 25 15K 0603 5 1 R140 26 18K 0603 5 1 R21...

Page 23: ...0G 0 1pF 16V 3 C164 C298 C299 51 6PF 0402 C0G 0 1pF 16V 3 C2 C147 C297 52 7PF 0402 C0G 0 1pF 16V 2 C36 C296 53 8PF 0402 C0G 0 1pF 16V 4 C285 C286 C303 C350 54 9PF 0402 C0G 0 1pF 16V 1 CY4 55 10PF 0402 C0G 0 5pF 16V 2 C7 C37 56 20PF 0402 C0G 5 16V 2 C69 C368 57 22PF 0402 C0G 5 16V 1 C316 58 30PF 0402 C0G 5 16V 2 C313 CY23 59 30PF 0603 C0G 5 16V 1 C352 60 33PF 0402 C0G 5 16V 3 C9 C29 C314 61 82PF 04...

Page 24: ... 20 16V 1 C269 80 2 2UF A type 20 16V 3 C115 C321 C322 81 4 7UF A type 20 6 3V 3 C8 C324 C325 82 10UF A type 20 6 3V 4 C327 C332 C335 C359 83 100UF C type 20 6 3V 1 C334 Inductance 84 BLM11A601S BLM18AG601SN1D 0603 Bead 600R 5 L4 L40 L41 L44 L45 85 BLM21PG300SN1D 0805 Bead 3 L35 L42 LU7 86 LQG11A2N2S LQG18HN2N2SJ00 0603 High frequecny multilaminated Inductance 1 LY18 87 LQG11A2N7S LQG18HN2N7SJ00 0...

Page 25: ... frequecny aircore coil Inductance 1 L57 98 MLF1608A3R3K 0603 Low frequecny multilaminated Inductance 5 L2 L8 L48 L65 L66 99 MLF1608E100K 0603 Low frequecny multilaminated Inductance 1 L15 100 0 4 φ1 6 3TR P type AIR CORE COIL Pin E 10 L6 L7 L18 L20 L33 L34 L59 L60 L62 L63 101 0 4 φ1 6 4TR P type AIR CORE COIL Pin E 1 L61 102 0 4 φ1 6 7TR P type AIR CORE COIL Pin E 1 L56 103 NC 0402 1 LY3 Diode 10...

Page 26: ... SOT 89 3L IC 5V 1 IC4 123 TA31136FN SSOP16 IF SYSTEM 1 IC17 124 GP460S1 GP214D SSOP16 PLL IC 1 IC3 Crystal 125 12 8MHz 3 2 5mm NT5032SC 1 X1 126 PCB TH308GB PSM5 0 0501 072101 V30 X58 1 Remark 1 Rectification on QY4 for RD01MUS1 and Q29 for RD07MVS1 updated on 2007 1 12 Pre rectification After rectification Item Specificati on Package Description Specification Package Description QY4 2SK3078 SOT ...

Page 27: ...8 Mic jack PJ 208B Silvered ST 106 gilded J4 9 Earpiece jack PJ 327 ST 016 041 PJ 3527 gilded J3 10 Speaker 4Ω 0 5W FCE Φ36mm F36M188A 11 Speaker lead One red one black and a 7 core copper wire Φ1 0 80mm PVC 12 Encoder ED08714O FE18C9 0 A16 100 VR7 13 Volume knob R09712NS FD15A7 5 B103 015 VR8 14 Anode Assembled part BAT2 Remark Assembled with anode reed M01308 004 bracket P02308 002 screw PBH2 0 ...

Page 28: ... 400 420 SMAK900 B05308 003 Outside transformer Input 220AC Output DC12V 600mA B09308 002 leash Blue B12308 002 Spring belt clip B11308 001 Transceiver TH308G D02 B01308 007 Instruction book B02308 003 Service card 1 year B04307 002 Battery packing 160 85 B04307 001 Transceiver packing 160 85 B03308 001 Packing Giftbox inner packing ...

Page 29: ...TH 308GB UHF SERVICE MANUAL 28 Exploded View ...

Page 30: ...TH 308GB UHF SERVICE MANUAL 29 Packing View ...

Page 31: ...z or blow and measurements are highly stable and accurate about 0 2ppm 4 Power Meter 1 Measurable frequency Up to 500MHz 2 Impedance 50Ω instability 3 Measuring range full scale of 10W or so 4 A standard cable 5D2W 1m must be used 5 RF Voltmeter RF V M 1 Frequency range up to 500MHz or so 6 Linear Detector 1 Frequency range up to 500MHz or so 2 Characteristics are flat CN is 60dB or more 7 Digital...

Page 32: ...10Vrms ADJUSTMENT FREQUENCY LIST Destination D57 D02 Channel TX f MHz Rx f MHz TX f MHz Rx f MHz Center 460 050 410 05 Low 450 050 400 05 High 469 950 419 95 Remark Connect the transceiver to the PC Send the channel data to the transceiver then backup the data Program the adjustment frequencies which are on the list into the transceiver Note Remember to reload the backed up date after making the a...

Page 33: ...deviation Battery level Section common to the transmitter and receiver VCO Measurement Adjustment Item Condition Test Equipment Terminal Parts Method Specification Remarks 1 Setting 1 Power supply voltage Battery terminal 7 5V 1 CH TX high 3 7V 0 2V 2 CH RX high Digital voltmeter TP1 TC2 3 7V 0 2 V 3 CH TX low 2 VCO lock voltage 4 CH RX low Check More then 1 0V ...

Page 34: ... shown in fig1 2 Audio Lever 1 CH Rx center SSG output 80dBm 501μV MOD 1KHz DEV 3 0KHz Wide 1 5KHz Narrow Check 0 63Vrms 3 Sensitivity 1 CH RX center CH RX LOW CH RX HIGH SSG output 116dBm 0 35μ V MOD 1KHz DEV 3 0KHz wide 1 5KHz narrow Check SINAD 12dB or higher 1 CH RX center MONI on 2 Level 9 SSG output 117dBm Level 9 Adjust to close the squelch The squelch must be closed 4 Squelch Level PC mode...

Page 35: ...nter AG 1KHz 12mV Modulation Analyzer or linear detector LPF 15KHz Oscilloscope Audio generator Audio voltmeter Antenna Speaker VR5 Check peak whichever is maximum 2 2KHz 3 6KHz wide 1 1KHz 1 8KHz narrow 5 QT DEV PC MODE 1 CH TX high QT 67 0Hz Modulation Analyzer or linear detector LPF 300Hz Oscilloscope Audio generator Audio voltmeter Antenna Adjust to 0 75 KHz wide Adjust to 0 35 KHz narrow 50Hz...

Page 36: ...TH 308GB UHF SERVICE MANUAL 35 BPF Wave Figure 1 ...

Page 37: ...Power control circuit ANT QY1 AMP QY4 DRIVE AMP Q29 FINAL AMP D17 ANT SW LPF ANT SW D19 RX 5T BATIN TXC TH2 SW Q50 VR1 ANTSW RF AMP ANT MCF 21 7MHz CF 450KHz IF SYST EM AF AMP SP TCXO 12 8MHz MIC MIC AMP PLL VCO RX TX TX AMP PA AMP OSC 21 25MHz ...

Page 38: ... XF1 X F2 MCF Q48 IF AM P IC 17 IF M IX DET CF2 2ndLocal OSC RF AMP Filter IC 300 B C IC 11 AF PA AMP X2 Unlocked detector circuit PLL circuit D27 D28 12 8MHz PLL DATA REF OSC I M I N PLL IC1 5KHz 6 25KHz PHASE COMPARATOR CHARGE PUMP LPF TX RXV CO Q3 BUFF AMP Q46 RF AMP Q47 T R SW D20 Q30 C295 IC3 PLL IC LOCK D7 C291 R1 5C IC2 LOCK CPU R35 ...

Page 39: ...5 0 47U C16 0 01U BATOUT Q39 2SA1362 VDD PLC C17 NC XF2 21 7M R14 NC C87 0 01U R104 3 3K C27 0 1U R125 1K R119 100K C28 0 1U C170 0 1U Q7 DTA114EE RXC L8 3 3U C26 0 01U Fin1 1 V vco 2 cp1 3 gnd 4 lock 5 clk 6 date 7 stb 8 bo 9 Xout 10 Xin 11 sw 12 gnd 13 cp2 14 V vco 15 Fin2 16 IC3 GP460S1 C30 1000P RXC RXC TXC RXCC 5V 5V TXCC TXC BATOUT BATIN BEEP CALL BATIN AFCC 5V LOCK CLK DATA STB SDA SCL RXC ...

Page 40: ...TH 308GB UHF SERVICE MANUAL 39 TH308GB Parts View Side A ...

Page 41: ...TH 308GB UHF SERVICE MANUAL 40 TH308GB Parts View Side B ...

Page 42: ...TH 308GB UHF SERVICE MANUAL 41 TH308GB PC Board View Side A ...

Page 43: ...TH 308GB UHF SERVICE MANUAL 42 TH308GB PC Board View Side B ...

Page 44: ...AL Frequency Range 450 470MHz D57 400 420MHz D02 350 370 MHz C57 370 390 MHz C79 RF power output 4W Number of channels 16CH Operating Voltage 7 5V DC 20 Temperature Range 30 to 60 22 to 140 With A 31A 7 4V 1200mAh Li ion battery 50W X 100H X 25D mm 201g ...

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