Intek M-760 PLUS Service Manual Download Page 1 | Manualshive

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Model No: M760 Plus

Customer: INTEK Rev No: A

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M-760 Plus

Service Manual

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Summary of Contents for M-760 PLUS

Page 1: ...Model No M760 Plus Customer INTEK Rev No A 1 M 760 Plus Service Manual...

Page 2: ...r INTEK Rev No A 2 Table of Contents Page Specifications 3 Test and Alignment Procedure 4 Block Diagram 13 Schematic Diagram 14 Printed Circuit Board 21 Channel Frequency Charts 23 Parts List 32 Semic...

Page 3: ...ystem Dual Conversion Super Heterodyne Intermediate Frequency 1 st IF 10 695 MHz 2 nd IF 455 MHZ Sensitivity 0 5 V for 20 db SINAD in FM mode Audio Distortion Less Than 8 1 KHz ImageRejection 65 dB Ad...

Page 4: ...wait until signals cease on your channel Then rotate the squelch control knob clockwise to a point where the background noise disappears Note When the squelch is set properly the speaker will remain...

Page 5: ...ightly less RV4 and corresponding three transistors control supply voltage of RF amplifier and other circuits Tune all the trimmer parts for maximum indication of RF power meter and adjust RV4 to make...

Page 6: ...0 Then we can see the recovered audio signals on Pin 9 for FM of IC7 With the amplitude of recovered signals Q10 serves as an audio amplifier For AM signal Will be pass filter CF1 and induced to Q6 Q7...

Page 7: ...ponents LCD meter does not work Defective D11 D22 Defective IC5 Defective RV2 RV6 Replace Replace Replace LCD display does not work Defective RED wire fuse Defective IC5 Replace Replace Channel select...

Page 8: ...E Check CH01A 0 8V CH14D 3 8V CH15D 0 8V CH21G 3 8V CH22G 0 8V CH40L 3 8V 3 Turn to AM mode and repeat above item 2 4 2 RX Section Alignment FM and AM 4 2 1 Audio Distortion Adjust 1 UUT set to FM mod...

Page 9: ...z Output level 0 5uV 9 Adjust the volume control for 2V output on distortion meter read 10 Adjust L2 L3 for more than 12dB at SINAD meter 11 Repeat as needed Check all channels sensitivity must met th...

Page 10: ...et off RF Gain set to maximum Squelch set to minimum ANL set off Noise generater pulse 1us width 100ms output level 1 0Vrms set to on and connect to the antenna socket with network combinator 8 Set au...

Page 11: ...dio distortion meter for Compander On and Off 4 3 4 PA audio output checking 1 The UUT enter PA mode after long press the ANL key Volume set maximum position for M 150 and the MIC gain set maximum pos...

Page 12: ...r DN keys 4 shortly press the EMG key to confirm 5 display will show the selected band ID code for 2 3 seconds then it will show the channel number 6 0 Factory Setting of Band for Shipment FACTORY SET...

Page 13: ...Model No M760 Plus Customer INTEK Rev No A 13 Schematic Diagram VCO CIRCUIT DIAGRAM...

Page 14: ...the phase detector The VCO output is divided by a programmable divider and fed to other side of the phase detector of IC4 The feedback loop is closed by passing the phase detector output through an ac...

Page 15: ...Model No M760 Plus Customer INTEK Rev No A 15 INTERNAL BLOCK DIAGRAM 3 DESCRIPTIONS OF EACH BLOCK A Introduction The synthesizer is implemented with the following Components PLL IC IC4 X TAL X2...

Page 16: ...or is a digital phase comparator which 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 erro...

Page 17: ...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...

Page 18: ...M FM 4W I2 Germany 80CH FM 4W 12CH AM 1W DE Germany 40CH FM 4W 12CH AM 1W D2 Europe 40CH FM 4W 40CH AM 1W EU CEPT 40CH FM 4W CE England 40CH FM 4W English Frequencies EC 40CH FM 4W CEPT U Poland 40CH...

Page 19: ...085 AM FM 12 27 105 AM FM 13 27 115 AM FM 14 27 125 AM FM 15 27 135 AM FM 16 27 155 AM FM 17 27 165 AM FM 18 27 175 AM FM 19 27 185 AM FM 20 27 205 AM FM 21 27 215 AM FM 22 27 225 AM FM 23 27 255 AM...

Page 20: ...065 AM FM 10 27 075 AM FM 11 27 085 AM FM 12 27 105 AM FM 13 27 115 AM FM 14 27 125 AM FM 15 27 135 AM FM 16 27 155 AM FM 17 27 165 AM FM 18 27 175 AM FM 19 27 185 AM FM 20 27 205 AM FM 21 27 215 AM...

Page 21: ...FM 14 27 125 AM FM 54 26 695 FM 15 27 135 AM FM 55 26 705 FM 16 27 155 FM 56 26 715 FM 17 27 165 FM 57 26 725 FM 18 27 175 FM 58 26 735 FM 19 27 185 FM 59 26 745 FM 20 27 205 FM 60 26 755 FM 21 27 21...

Page 22: ...M 9 27 065 AM FM 10 27 075 AM FM 11 27 085 AM FM 12 27 105 AM FM 13 27 115 AM FM 14 27 125 AM FM 15 27 135 AM FM 16 27 155 FM 17 27 165 FM 18 27 175 FM 19 27 185 FM 20 27 205 FM 21 27 215 FM 22 27 225...

Page 23: ...1 27 085 AM FM 12 27 105 AM FM 13 27 115 AM FM 14 27 125 AM FM 15 27 135 AM FM 16 27 155 AM FM 17 27 165 AM FM 18 27 175 AM FM 19 27 185 AM FM 20 27 205 AM FM 21 27 215 AM FM 22 27 225 AM FM 23 27 255...

Page 24: ...27 065 FM 10 27 075 FM 11 27 085 FM 12 27 105 FM 13 27 115 FM 14 27 125 FM 15 27 135 FM 16 27 155 FM 17 27 165 FM 18 27 175 FM 19 27 185 FM 20 27 205 FM 21 27 215 FM 22 27 225 FM 23 27 255 FM 24 27 23...

Page 25: ...5 FM 14 27 125 FM 15 27 74125 FM 15 27 135 FM 16 27 75125 FM 16 27 155 FM 17 27 76125 FM 17 27 165 FM 18 27 77125 FM 18 27 175 FM 19 27 78125 FM 19 27 185 FM 20 27 79125 FM 20 27 205 FM 21 27 80125 FM...

Page 26: ...AM FM 11 27 080 AM FM 12 27 100 AM FM 13 27 110 AM FM 14 27 120 AM FM 15 27 130 AM FM 16 27 150 AM FM 17 27 160 AM FM 18 27 170 AM FM 19 27 180 AM FM 20 27 200 AM FM 21 27 210 AM FM 22 27 220 AM FM 2...

Page 27: ...CAP ELECT 16V M 22UF 2 C134 C158 17 KEC E227ERMU CAP ELECT 16V M 220UF 3 C120 C155 C60 18 KEC E227FRMU CAP ELECT 25V M 220UF 1 C102 19 KEC E476ERMKS CAP ELECT 16V M 47UF 1 C157 20 KEC E476ERMU CAP EL...

Page 28: ...KE EI19KY 226 1 CH1 66 KETR 067 BW 0903 BAN WO TRA NSFORMER 1 T1 67 KEX 0318 CRYSTAL 10 24DMHZ CL 30PF 1 X1 68 KEX 0474 CRTAL 4MZ 20PPM HC 1 X2 69 M 760B1S BASE MAIN PCB SMT 1 70 M 760B1SB BASE MAIN P...

Page 29: ...8 C25 C45 C47 C91 C106 C167C170 114 KCC 103FRKBB CAP CER CHIP 50V B K 0 01UF 27 C19 C20 C24 C27 C34 C36 C58 C110 C135 C145 C146 C120A C173 C203 C212 C39 C149 C503 C175 C119 C86 C89 C97 C63 C424 C174...

Page 30: ...72 R175 R176 150 KCR 102B RES CHIP 1 16W 1K 16 R3 R4 R35 R69 R80 R99 R114 R412 R416 R207 R91 R163 R156 R157 R197 R129 151 KCR 103B RES CHIP 1 16W 10K 22 R9 R23 R53 R82 R124 R134 R211 R182 R184 R185 R1...

Page 31: ...R 823B RES CHIP 1 16W 82 K 2 R31 R167 196 KCR 824B RES CHIP 1 16W 82 0K 1 R25 197 KCT KTA1504S TR CHIP PNP KTA15 04S SOT 23 6 Q8 Q11 Q13 Q19 Q22 Q40 198 KCT KTC3875S TR CHIP NPN KTC38 75S GR 5 Q1 Q54...

Page 32: ...R333 R334 R341 230 KEPC 1050 A PCB 149 44 1 6MM D S FR 4 1 231 KEPC 1054 A PCB 65 25 1 6MM SS 94V 0 1 232 KER D103B502A RD12BF 20C2 38 5K 042 1 ALPHA 1 233 KER 103RD123SF RD123SF 20BC 29K B 10K 1002 A...

Page 33: ...0 0 Q37 G 0 0 2SK211 Y C 0 0 8 MMBTRC104SS S 0 5 7 9 B 0 6 7 D 2 8 0 Q14 E 1 2 0 Q40 G 0 7 0 9 KCT3880S C 8 0 0 KTA1504S S 0 0 B 2 0 0 D 0 6 1 Q16 E 0 0 E 2SC2314F C 8 5 3 0 C B 1 0 0 B Q17 E 0 0 E C...

Page 34: ...1 K D5 A 0 0 A 1K261 K 0 0 K D6 A 10 6 2 8 A 1N4004 K 9 7 2 8 K D10 A 0 0 A 1N4004 K 12 8 13 2 K D14 A 7 9 0 A KDS160 K 7 2 0 6 K D16 A 2 5 0 A KDS160 K 2 2 2 2 K D19 A 7 9 0 A KDS160 K 7 3 0 K IC4 TB...

Page 35: ...5 3 7 3 7 12 0 0 6 3 9 3 9 13 0 1 7 7 3 9 3 9 14 0 0 IC8 TDA2003 PIN TX RX PIN TX RX 1 1 0 1 0 4 6 3 6 3 2 0 8 0 8 5 13 2 13 2 3 0 0 IC6 KIA78L05F PIN TX RX PIN TX RX 1 5 5 3 13 2 13 2 2 0 0 IC7 SL501...

Page 36: ...10 5 00 5 0 42 1 5 1 5 11 0 0 43 1 5 1 5 12 0 0 44 2 6 2 6 13 0 0 45 2 6 2 6 14 4 9 0 46 2 6 2 6 15 0 0 47 2 6 2 6 16 5 0 5 0 48 2 6 2 6 17 5 0 5 0 49 2 6 2 6 18 5 0 5 0 50 2 6 2 6 19 5 0 5 0 51 2 6...

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