Intek M-490 Plus Service Manual
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Intek M-490 Plus Service Manual

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Model No:
3390
Customer :
Created by:
For Stage:
Model No:
M-490 Plus
M-490 Plus
Service Manual
Approved by:
Release Date:
Drawring No:
Rev,Date:
Rev.No:
Page:
1
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61

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Summary of Contents for Intek M-490 Plus

  • Page 1 Model No: 3390 Model No: Drawring No: M-490 Plus Customer : Rev,Date: M-490 Plus Service Manual Created by: Approved by: Rev.No: For Stage: Release Date: Page:...
  • Page 2 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Table of Contents Page Specifications Test and Alignment Procedure Block Diagram Schematic Diagram Printed Circuit Board Channel Frequency Charts Parts List Semiconductor Voltage Chart Semiconductor Lead Assignment and Block Diagram...

  • Page 3: Specifications

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: SPECIFICATIONS 1. GENERAL Channels………………………...……………………………....400 Ch AM/FM 4W Frequency Range………………………………...……………… ..25.615 to 30.105 MHz FrequencyControl……………………………………………………..…………..………PLL Operating Temperature Range……………………..…………………………-10° / +55°C DC Input Voltage…………………………...……………………………..13.2 V DC ±15% Size………………………………………….……………….…180(L) X 50(H) X 153(D) mm Weight………………………………………………………………..……...…………0.850 kg...
  • Page 4 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: OPERATION INSTRUCTIONS Having properly installed your batteries and hooked-up the antenna, you are now ready to operate your radio for optimum reception and voice transmission. Turn the power “ON” with ON/OFF switch.

  • Page 5: Theory Of Operations

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: THEORY OF OPERATIONS TRANSMITTER A. RF Amplification The output of double AMP Q301 is fed through tuning IFT L301 and L302 to the base of pre driver AMP Q302. The output is then supplied through tuning circuit L303 to RF driver AMP Q303. The output of Q303 is supplied with tuning circuit L304 and C317,C315,C21 and goes to the base of final RF AMP Q304.

  • Page 6: Troubleshooting Hints

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: E. Receiver CB receiver is dual conversion supper-heterodyne type with the first IF 10.695 MHz and second IF 455 KHz. Receiver is separated two blocks, 1 IF section and 2 IF section.
  • Page 7 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: • Defective microphone. • Replace • Replace the defective • Poor audio output and defective modulation components. microphone amplifier components (IC103). No modulation • Defective microphone connector components. • Replace •...

  • Page 8: Alignment Procedure

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: ALIGNMENT PROCEDURE Connection Adjuster Adjust for Step Setting Frequency adjustment MIC : Receive Frequency counter Volume : optional to dummy load CT201 27.185MHz±300Hz Squelch : optional (Figure 1). CH selector : 19 EU...

  • Page 9: Transmitter Section

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: TRANSMITTER SECTION Test Equipment Required • RF power meter (RF SSVM) • DC power supply (13.2 volt, 3 amp) • 50 ohms dummy load (non-inductive) • Spectrum analyzer • RF attenuator (50 ohms non-inductive) •...
  • Page 10 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: TX power level Connect dummy load RV202 Adjust until the 5 adjustment and oscilloscope through appears on the Volume : optional Coupler to RF channel display LCD. Squelch : optional...

  • Page 11: Receiver Section

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Figure 4 RECEIVER SECTION Test Equipment Required • RF Signal generator (RFSG) • SSVM • Distortion meter • DC power supply ALIGNMENT PROCEDURE Connection Adjuster Adjust for Step Setting...
  • Page 12 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Squelch adjustment Connect RF signal Adjust until the audio MIC : Receive generator to EXT-ANT output appears. Volume : 50mW (2V) Jack. Connect SSVM Squelch : Clockwise and distortion meter to...
  • Page 13 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Figure 6 Figure 7 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 14 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 15 Model No: 3391 Model No: Drawring No: M-790 Plus Customer : Rev,Date: PLL CIRCUIT BLOCK DIAGRAM 1. INTRODUCTION The frequencies for transmitter and receiver first local frequencies are all derived from a single 4.5 MHz crystal by means of a phase locked loop. The first local oscillator frequencies are 16.270 MHz (CH 1) to 16.710 MHz (CH 40) for EU and 16.90625 MHz (CH 1) to 17.29625 MHz (CH 40) for UK .
  • Page 16 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: 2. BASIC SYNTHESIZER SCHEME The crystal frequency (4.500 MHz) is divided by 1800 times to make 2.5 KHz 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 75 of IC101.

  • Page 17: Internal Block Diagram

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: The VCO frequency goes to the double circuit, which doubles the incoming signals. Double output Frequency 26.965 MHz Transmit CH 1, 13.4825 MHz 27.60125 MHz _______ CH 1, 13.800625 MHz 27.405 MHz...
  • Page 18 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: DIVIDE RATIO, VCO RX TX FREQUENCIES FOR EACH CHANNEL OF “EU” Frequencies Channels (MHz) Frequencies Frequencies 26.965 6508 16.27 5393 13.4825 26.975 6512 16.28 5395 13.4875 26.985 6516 16.29 5397 13.4925...
  • Page 19 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: 27.375 6672 16.68 5475 13.6875 27.385 6676 16.69 5477 13.6925 27.395 6680 16.70 5479 13.6975 27.405 6684 16.71 5481 13.7025 DIVIDE RATIO, VCO RX/TX FREQUENCIES FOR EACH CHANNEL OF “UK”...
  • Page 20 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: 27.90125 6882.5 17.20625 5580.25 13.950625 27.91125 6886.5 17.21625 5582.25 13.955625 27.92125 6890.5 17.22625 5584.25 13.960625 27.93125 6844.5 17.23625 5586.25 13.965625 27.94125 6898.5 17.24625 5588.25 13.970625 27.95125 6902.5 17.25625 5590.25 13.975625...
  • Page 21 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: D. Phase detector and VCO control The detector 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 error of each signal.

  • Page 22: Frequency Stability

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: 4. FREQUENCY STABILITY LET : Fo = Crystal oscillator frequency Fr = Phase detector reference frequency Fvco = VCO frequency Ft = Transmit frequency Then : Fr = Fo/1800 And under locked conditions : Fr = Fvco / N WHERE, “N”...

  • Page 23: Printed Circuit Board

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Printed Circuit Board Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 24 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies Tables for M-790 Plus Specification LCD Display Legal Bands Italy 40CH AM / FM 4W Italy 36CH AM / FM 4W Germany 80CH FM 4W 12CH AM 1W...
  • Page 25 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for I0 band (Italy 40CH AM / FM 4W) Modulation Frequency (MHz) 26.965 AM / FM 26.975 AM / FM 26.985 AM / FM 27.005 AM / FM 27.015...
  • Page 26 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for I2 band (Italy 34CH AM / FM 4W) Modulation Frequency (MHz) 26.965 AM / FM 26.975 AM / FM 26.985 AM / FM 27.005 AM / FM 27.015...
  • Page 27 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for DE band (Germany 80CH FM 4W 12CH AM 1W) Modulation Modulation Frequency (MHz) Frequency (MHz) 26.965 26.565 26.975 26.575 26.985 26.585 27.005 AM / FM 26.595 27.015 AM / FM 26.605...
  • Page 28 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for D2 band (Germany 40CH FM 4W 12CH AM 1W) Modulation Frequency (MHz) 26.965 26.975 26.985 27.005 AM / FM 27.015 AM / FM 27.025 AM / FM 27.035...
  • Page 29 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for EU band (Europe 40CH FM 4W 40CH AM 1W) Modulation Frequency (MHz) 26.965 AM / FM 26.975 AM / FM 26.985 AM / FM 27.005 AM / FM 27.015...
  • Page 30 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for CE band (CEPT 40CH FM 4W) Modulation Frequency (MHz) 26.965 26.975 26.985 27.005 27.015 27.025 27.035 27.055 27.065 27.075 27.085 27.105 27.115 27.125 27.135 27.155 27.165 27.175 27.185...
  • Page 31 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for SP band (Spain 40CH AM / FM 4W) Modulation Frequency (MHz) 26.965 AM / FM 26.975 AM / FM 26.985 AM / FM 27.005 AM / FM 27.015...
  • Page 32 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for FR band (France 40CH FM 4W 40CH AM 1W) Modulation Frequency (MHz) 26.965 AM / FM 26.975 AM / FM 26.985 AM / FM 27.005 AM / FM 27.015...
  • Page 33 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for UK band (England 40CH FM 4W + CEPT 40CH FM 4W) England Frequencies CEPT Frequencies Modulation Modulation Frequency (MHz) Frequency (MHz) 27.60125 26.965 27.61125 26.975 27.62125 26.985 27.63125...
  • Page 34 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for PL band (Poland 40CH AM / FM 4W Polish Frequencies –5kHz) Modulation Frequency (MHz) 26.960 AM / FM 26.970 AM / FM 26.980 AM / FM 27.000 AM / FM 27.010...
  • Page 35 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Frequencies for SW band (Sweden 24 CH FM 4W 31 MHz) Modulation Frequency (MHz) 30.930 31.040 31.050 31.060 31.070 31.080 31.090 31.100 31.110 31.120 31.140 31.150 31.160 31.180 31.190 31.200...

  • Page 36: Part List

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: PART LIST Part No. Part name & Description Q’ty Ref. 1 533-90C-A COVER ASS'Y 2 420-113-6 SPEAKER 8 OHM 3.0W 77MM P-302RM-A 3 533-90E-SC ESCUTCHEON ASS'Y 4 533-90F-B FRONT BODY ASS'Y...
  • Page 37 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Part No. Part name & Description Q’ty Ref. 28 252-327-0 LCD DISPLAY IS06618P LCD1 29 431-162-1Z SW SLIDE SKS-22021T SW9.11 30 436-059-7Z SW TACT TM115AP SW1.2.3.4.5.6.7.8.10.12 31 533-90M-A MIC ASS'Y...
  • Page 38 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Part No. Part name & Description Q’ty Ref. 50 05B-104-6Z CHIP RESISTOR 100K 1/16W 5% T 1608 R7.29.141.172.173.406.409. 411.415.438.701.702.703. + 704.705.706.707.708.709.710. 711.712.713.714.715.716.717. 718.719.721.722.723.903.904. 905.720.724 51 05B-106-8Z CHIP RESISTOR 10M 1/16W 5% T 1608 R176.177...
  • Page 39 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Part No. Part name & Description Q’ty Ref. 72 05B-393-0Z CHIP RESISTOR 39K 1/16W 5% T 1608 R155.407.442 73 05B-470-6Z CHIP RESISTOR 47 1/16W 5% T 1608 R27A.128.306 74 05B-471-7Z CHIP RESISTOR 470 1/16W 5% T 1608 R1.24.25.31.112.213.311.427...
  • Page 40 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: 92 130-261-9Y CHIP CERAMIC 0.022UF GRM39 X7R223K 50V PT C27.29.36.146.306 93 130-440-4Y CHIP CERAMIC 0.047UF GRM39 Y5V473Z 25V PT C35.141.143.145.147.242.248. 314.322.323.432.455.530 94 130-620-1 CHIP CERAMIC 0.0068UF GRM39 X7R682K 50V PT C445.454...
  • Page 41 Customer : M-490 Plus Rev,Date: Part No. Part name & Description Q’ty Ref. 115 133-936-1Y CHIP CERAMIC 390PF GRM39 COG391J 50V PT C333 116 134-012-1Y CHIP CERAMIC GRM39 COG040C 50V PT C326 117 134-757-1Y CHIP CERAMIC 47PF GRM39 COG470J 50V PT C101.328.447.R901...
  • Page 42 Customer : M-490 Plus Rev,Date: Part No. Part name & Description Q’ty Ref. 140 222-018-5A KIA324F-EL 141 222-023-9A I.C DETECTOR KIA7042F 142 223-224-9 MC14066BDR2:SO14 IC602 143 242-024-6 DIODE VARIVAP CHIP KDV251S D402.403 144 243-051-5 DIODE SI CHIP KDS184S D1.2.3.4.5.6.56.101.102.103. 104.122.153.154.203.301.302. + 303.407.413.414...
  • Page 43 Customer : M-490 Plus Rev,Date: Part No. Part name & Description Q’ty Ref. 163 101-043-5Z ELECT CAPACITOR 10UF 16V SRA(M):4X7 2.5PT C7.9.32.33.38.134.232.235.238. 239.436.461.601.605.610.205. + 25.466.467.468.502 164 101-117-9 ELECT CAPACITOR 1000UF 16V 20% 10X16 C11.15 165 101-122-3 ELECT CAPACITOR 100UF 16V 20% 6.3X11 C228.237...
  • Page 44 Customer : M-490 Plus Rev,Date: Part No. Part name & Description Q’ty Ref. 188 300-024-5Y TRANSFORMER EI-28 (OPT) T201 189 300-136-3W TRANSFORMER LE119-H019 CH501 190 310-022-6Z COIL RF CHOKE 10UF CR5K-869538 L601 188 300-024-5Y TRANSFORMER EI-28 (OPT) T201 189 300-136-3W TRANSFORMER...
  • Page 45 Customer : M-490 Plus Rev,Date: Part No. Part name & Description Q’ty Ref. 213 131-529-7Y CHIP CERAMIC 150PF GRM40 COG151J 50V PT C402.404.406 214 133-306-2Y CHIP CERAMIC 33PF GRM40 COG330J 50V PT C408 215 134-722-1Y CHIP CERAMIC 47PF GRM40 COG470J 50V PT C403.405.407...
  • Page 46 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Part No. Part name & Description Q’ty Ref. 228 533-90W-MA WIRE MIC ASS'Y 229 427-023-6 WIRE 1007 AWG 24(11/0.16) RED 0.06 SW --- PCB MIC 0.5:0.5 230 427-025-8 WIRE 1007 AWG 24(11/0.16) YEL...

  • Page 47: Voltage Chart

    Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Voltage Chart TRANSISTOR Ref. Ref. Q103 KTC3876 KRC101 Q104 KRC111 KRC101 Q105 KRC104 KTK211 1.14 Q106 KRC104 KTK211 Q107 KTC3880 KTC3875 Q112 KTC3876 KTC3876 3.15 Q113 KRC112 KTC3876 Q114...
  • Page 48 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: TRANSISTOR Ref. Ref. Q202 Q303 KRC102 2SC2314 Q204 Q304 KTC3876 2SC2078 Q205 Q403 KTA1504 KRC101 Q207 Q404 KTC3876 KRC101 Q208 Q405 KTA1504 KRC101 Q211 Q406 KTC3876 11.2 12.39 KRC101...
  • Page 49 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: TRANSISTOR Ref. Ref. Q601 Q603 KTC3875 KTC3875 Q602 KRC104 DIODE Ref. Ref. D122 KDS184 KDS184 D154 KDS184 KDS184 D203 KDS184 KDS184 D301 KDS184 KDS184 D302 KDS184 KDS184 D303 KDS184...
  • Page 50 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: DIODE Ref. Ref. DZ201 D202 1N5237 1N5404 DZ401 D531 1N5232 1N4004 IC 102 TK14489 IC6 BU2630F Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 51 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: IC601 DBL5020V IC103 KIA7212 12.3 12.9 11.9 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 52 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: IC101 S3P8249XZZ-TWR9 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 53 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: IC9 24LLC02A IC2 KIA324 IC1 KIA7042F IC602 MC14066BDR2 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 54 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: SEMICONDUCTOR LEAD IDENTIFICATION AND IC INTERNAL CONNECTIONS INTERATED CIRCUITS IC101 : S3P8249XZZ-TWR9 IC102 : TK14489 IC9 : 24LLC02 8 PIN IC104 : KIA7217A KDV251 DIODES 1N4004 .1N60 .1N5232 1N5404 .1N5237...
  • Page 55 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: MC14066BDR2 BU2630F IC1 KIA7042F KDS184 KIA324 DBL5020V IC104 KIA7217A Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 56 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 57 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Model M-490 Explode view part list PART-NO. Part name & Description Q'TY REFERENCE-NO Remark 623-344 (+)TAPPING SCREW(BH)3X8-2S BLK 633-082 (+)TAP TITE SCREW BH3X6 BLK 633-152 (+)TAP TITE SCREW BH3X4-3S BLK...
  • Page 58 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: 429-078-6B FLAT WIRE 07P 88MM 2.5PITCH 429-266-9Z FLAT CABLE 03P 80MM 2.5PITCH (HH-35) 430-049-8Y SW ROTARY YPS210120SK SW105 440-020-4 MICA 0.1T:15X13 MICA FOR TR 450-609-0 50KA:K161110-5M1112 PCB TYPE VR102.108...
  • Page 59 Model No: 3390 Title Drawring No: M-490 Plus Customer : Rev,Date: Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 60 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...
  • Page 61 Created by: Approved by: Rev.No: For Stage: Release Date: Page: / 61...

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