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Intek H 520 PLUS Service Manual

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Model No:
3420
Customer :
H 520 PLUS
Created by:
For Stage:
Model No:
Service Manual
Approved by:
Release Date:
H 520 PLUS
Drawing No:
Rev. Date:
Rev.No:
Page:
1 Of 57

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  • Page 1 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: H 520 PLUS Service Manual Created by: Approved by: Rev.No: For Stage: Release Date: Page: 1 Of 57...
  • Page 2 Model No: 3420 Model No: Drawing No: H 520 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: 3420 Model No: Drawing No: H 520 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° / +50°C DC Input Voltage…………………………………………………..………………………..………..9.0 V DC ±15% Size………………………………………………………………….……..………..….…140(L) X 60(W) X 30(H) mm Weight………………………………………………………………………………..…………..……...……..……0.50 kg...
  • Page 4 Model No: 3420 Model No: Drawing No: H 520 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: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: THEORY OF OPERATIONS TRANSMITTER A. RF Amplification The output of double AMP Q201 is fed through tuning T203 and T204 to the base of pre driver AMP Q202. The output is then supplied to RF driver AMP Q203.
  • Page 6 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Modulation signal is fed to audio amplifier IC KIA324 and goes to TX voltage regulate circuit Q509, Q502, Q501 to make nominal signal level to achieve wanted modulation. To control incoming audio signal, R272 and corresponding ALC circuit limits the modulation shall not exceed +/-60% adjust RV702 +/-60% modulation under 1.0 KHz AF 60% mod plus 20 dB of audio signal.

  • Page 7: Troubleshooting Hints

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: TROUBLE SHOOTING HINTS Symptom Probable Cause Remedy • Defective power switch VR601. • Replace • Empty Battery. Unit does not work • Replace • Broken wire Battery.

  • Page 8: Alignment Procedure

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: ALIGNMENT PROCEDURE Step Setting Connection Adjuster Adjust for Frequency adjustment MIC : Receive Frequency counter to Volume : optional dummy load (Figure X302 27.185MHz±300Hz Squelch : optional...

  • Page 9: Transmitter Section

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: TRANSMITTER SECTION Test Equipment Required • RF power meter (RF SSVM) • DC power supply (9.0 volt, 3 amp) • 50 ohms dummy load (non-inductive) • Spectrum analyzer •...
  • Page 10 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Figure 3 Figure 4 Created by: Approved by: Rev.No: For Stage: Release Date: Page: 10 Of 57...

  • Page 11: Receiver Section

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: RECEIVER SECTION Test Equipment Required • RF Signal generator (RFSG) • SSVM • Distortion meter • DC power supply ALIGNMENT PROCEDURE Connection Adjuster Adjust for Step...
  • Page 12 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Figure 5 Figure 6 Figure 7 Created by: Approved by: Rev.No: For Stage: Release Date: Page: 12 Of 57...
  • Page 13 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Created by: Approved by: Rev.No: For Stage: Release Date: Page: 13 Of 57...
  • Page 14 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Created by: Approved by: Rev.No: For Stage: Release Date: Page: 14 Of 57...
  • Page 15 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Created by: Approved by: Rev.No: For Stage: Release Date: Page: 15 Of 57...
  • Page 16 Model No: 3420 Model No: Drawing No: H 520 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 10.240 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 17 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 2. BASIC SYNTHESIZER SCHEME The crystal frequency (10.240MHz) 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 11 of IC302.

  • Page 18: Internal Block Diagram

    Model No: 3420 Model No: Drawing No: H 520 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...
  • Page 19 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: DIVIDE RATIO, VCO RX/TX FREQUENCIES FOR EACH CHANNEL OF “EU” Frequencies Channels (MHz) Frequencies MHz Frequencies MHz 26.965 6508 16.27 5393 13.4825 26.975 6512 16.28 5395 13.4875...
  • Page 20 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: DIVIDE RATIO, VCO RX/TX FREQUENCIES FOR EACH CHANNEL OF “UK” Frequencies Channels (MHz) Frequencies MHz Frequencies MHz 27.60125 6546.5 16.90625 5412.25 13.800625 27.61125 6766.5 16.91625 5522.25 13.805625...
  • Page 21 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 3. DESCRIPTIONS OF EACH BLOCK A. Introduction The synthesizer is implemented with the following Components: - PLL IC (IC302) - X-TAL (X302) - VCO, VARICAP DOIDE (D301) IC302 is a cmos LSI that includes most of PLL block and driver, the Q301, C305, C306, C304, C301 and T302, Varicap diode D301 are clapp oscillator circuit to operate as a VCO of the IC302.

  • Page 22: Frequency Stability

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: H. Receiver local oscillator outputs First Mixer: The secondary output signals is injected to the sources of 1 mixer Q102, Q103 in the 1 IF mixer section Second Mixer: The output of 10.24 MHz oscillator circuit with X101 is injected into the IF IC internally.
  • Page 23 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Printed Circuit Board Created by: Approved by: Rev.No: For Stage: Release Date: Page: 23 Of 57...
  • Page 24 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Created by: Approved by: Rev.No: For Stage: Release Date: Page: 24 Of 57...
  • Page 25 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: FREQUENCY TABLE FOR EUROPEAN 1. Frequencies for E1 band (Italy 40CH AM / FM 4W) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.965 AM / FM 27.215 AM / FM 26.975...
  • Page 26 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 2. Frequencies for I2 band (Italy 36CH AM / FM 4W) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.965 AM / FM 27.185 AM / FM 26.975 AM / FM 27.205...
  • Page 27 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 3. Frequencies for DE band (Germany 80CH FM 4W 12CH AM 1W ) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.965 26.565 26.975 26.575 26.985 26.585 27.005 AM / FM 26.595...
  • Page 28 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 4. Frequencies for D2 band (Germany 40CH FM 4W 12CH AM 1W ) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.965 27.215 26.975 27.225 26.985 27.255 27.005 AM / FM 27.235...
  • Page 29 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 5. Frequencies for EU band (Europe 40CH FM 4W 40CH AM 1W) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.965 AM / FM 27.215 AM / FM 26.975...
  • Page 30 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 6. Frequencies for CE band (CEPT 40CH FM 4W) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.965 27.215 26.975 27.225 26.985 27.255 27.005 27.235 27.015 27.245 27.025 27.265...
  • Page 31 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 7. Frequencies for UK band (England 40CH FM 4W + CEPT 40CH FM 4W) England Frequencies CEPT Frequencies Frequency (MHz) Modulation Frequency (MHz) Modulation 27.60125 26.965 27.61125...
  • Page 32 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 8. Frequencies for PL band (Poland 40CH AM / FM 4W Polish Frequencies – 5kHz) Frequency (MHz) Modulation Frequency (MHz) Modulation 26.960 AM / FM 27.210 AM / FM 26.970...
  • Page 33 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 9. Frequencies for RU band (Russia 400CH AM / FM 4W) Freq. Freq. Freq. Freq. Freq. 25.615 26.515 27.415 28.315 29.215 25.625 26.525 27.425 28.325 29.225 25.635...
  • Page 34 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Freq. Freq. Freq. Freq. Freq. 25.965 26.865 27.765 28.665 29.565 25.975 26.875 27.775 28.675 29.575 25.985 26.885 27.785 28.685 29.585 25.995 26.895 27.795 28.695 29.595 26.005 26.905...
  • Page 35 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Freq. Freq. Freq. Freq. Freq. 27.215 26.315 28.115 29.015 29.915 27.225 26.325 28.125 29.025 29.925 27.255 26.355 28.155 29.055 29.955 27.235 26.335 28.135 29.035 29.935 27.245 26.345...
  • Page 36 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 10. Frequencies for PO band (Poland 400CH AM / FM 4W Polish Frequencies –5kHz) Freq. Freq. Freq. Freq. Freq. 25.610 26.510 27.410 28.310 29.210 25.620 26.520 27.420...
  • Page 37 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Freq. Freq. Freq. Freq. Freq. 25.960 26.860 27.760 28.660 29.560 25.970 26.870 27.770 28.670 29.570 25.980 26.880 27.780 28.680 29.580 25.990 26.890 27.790 28.690 29.590 26.000 26.900...
  • Page 38 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Freq. Freq. Freq. Freq. Freq. 27.210 26.310 28.110 29.010 29.910 27.220 26.320 28.120 29.020 29.920 27.250 26.350 28.150 29.050 29.950 27.230 26.330 28.130 29.030 29.930 27.240 26.340...
  • Page 39 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: 11. Frequencies for PC band (Private Channels AM / FM 4W) Frequency (MHz) Frequency (MHz) 25.645 AM / FM 27.895 AM / FM 25.695 AM / FM 27.945...

  • Page 40: Part List

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Part list Code No Name Description O’ty Reference No 501-900019AB 53420EA(EXT ANT CAR ADAPT ASSY H-520 PLUS 911-110037GH 0301017Z(RES. FILM) 100 1/ 2W 5% ST MINI SUB;...
  • Page 41 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Part list Code No Name Description O’ty Reference No 911-622037BF 05D2218Z(RES. CHIP) 220 1/16W 5% 1005 SMD; R710.202.207 911-622047BF 05D2229Z(RES. CHIP) 2.2K 1/16W 5% T 1005 SMD;...
  • Page 42 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Part list Code No Name Description O’ty Reference No 913-411301HG 1313127Y(CAP. CERAMIC CHIP) 13PF GRM36COG130J50V SMD; C315 913-411501HG 1315846Y(CAP. CERAMIC CHIP) 15PF GRM36 COG150J 50V SMD; C304.204 913-421801HG 1318342Y(CAP.
  • Page 43 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Part list Code No Name Description O’ty Reference No 881-883476AA 2003014(TR FET) 2SK3476 SMD; Q204 881-191504SG 2020826(TR) KTA1504ST1(G)(SOT-23) SMD; Q707.502.506 881-390101SN 2020859(TR) KRC101SNA, NPN, SOT-23 SMD; Q705.304.305.306.307.111.104.105.2...
  • Page 44 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Part list Code No Name Description O’ty Reference No 915-124707CKAM 1047660Z(CAP. ELECT) 47UF 16V 20% 6X5 SUB; C609 915-124708CKAE 1048139X(CAP. ELECT) 470UF 16V 20% 8X12 T3.5pt SUB;...

  • Page 45: Voltage Chart

    Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: VOLTAGE CHART TRANSISTOR Ref. Ref. Q601 8.42 8.65 0.04 KRA226 1.55 8.64 KRC101 0.04 8.37 0.08 0.04 4.21 Q203 0.08 Q109 0.04 4.21 2SK3078 2.32 2.95 KRA110 0.06...
  • Page 46 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: TRANSISTOR Ref. Ref. Q901 1.12 1.07 Q303 0.03 KTC3875 4.15 KTC3880 2.33 1.68 0.74 0.71 Q903 0.89 0.83 Q301 3.19 3.17 KTC3875 4.21 4.15 KTC3880 4.27 4.24...
  • Page 47 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: DIODE Ref. Ref. D302 0.03/0.00 0.00/0.00 D502 3.19/2.29 3.64/2.93 KDV251 0.03 KDS184 2.76 3.19 D301 0.03/0.00 0.00/0.00 D702 -3.5 0.09/1.36 KDV251 0.04 4.72 KDS184 0.04 0.72 D109 0.1818182...
  • Page 48 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Ref. 0.00 0.00 4.76 4.73 0.00 0.00 0.04 4.76 0.00 0.00 0.04 0.00 0.00 0.00 0.04 0.00 0.00 0.00 4.75 0.00 0.00 0.00 4.65 4.63 0.00 0.00...
  • Page 49 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Ref. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.25 1.22 0.00 0.00 0.04 0.00 0.00 0.00 0.04 0.00 2.75 2.72 0.04 0.00...
  • Page 50 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Ref. 0.04 2.92 0.00 1.19 0.11 0.28 0.00 1.19 0.11 0.29 0.04 1.19 IC102 0.05 4.18 0.04 0.00 KIA324 0.11 0.31 0.04 0.01 0.12 0.30 0.04 1.19...
  • Page 51 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Ref. 2.08 2.07 0.11 0.06 0.04 0.00 0.11 0.09 0.04 0.00 2.41 2.41 0.49 0.45 3.78 3.73 IC302 BU2630 4.31 0.46 0.50 0.45 0.04 0.00 1.11 0.94...
  • Page 52 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Ref. 0.05 0.00 IC501 5.03 4.98 LD1117 8.43 8.63 5.03 4.98 IC803 0.04 0.00 KIA7402 4.76 4.73 Created by: Approved by: Rev.No: For Stage: Release Date:...
  • Page 53 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: SEMICONDUCTOR LEAD IDENTIFICATION AND IC INTERNAL CONNECTIONS DIODES 1N4004 .1N4148 KDV251 KDS184 KDS114 .1N5232 1N5404 .1N5237 . Created by: Approved by: Rev.No: For Stage: Release Date:...
  • Page 54 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: TRANSISTORS / FET KTK211 KRC101S, KRC110, Q204: 2SK3476 KTC3876, KTC3880 KTC3875,3880 KRC101~104 IC501 : LD111750 Q203: 2SK3078 Q501 : KTA1042 V in V out Created by: Approved by: Rev.No:...
  • Page 55 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: INTERATED CIRCUITS IC801: EM78P569 IC 302: BU2630F IC102/ 4 : KIA324 IC101 : TK10931 IC802: 24LLC16 / 8 PIN IC901: DBL5020 IC601 : LM386 IC902 : 14066...
  • Page 56 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Explode view drawing Created by: Approved by: Rev.No: For Stage: Release Date: Page: 56 Of 57...
  • Page 57 Model No: 3420 Model No: Drawing No: H 520 PLUS Customer : Rev. Date: Explode view part list New Part No. PART-NO. NAME & DESCRIPTION NAME & DESCRIPTION Q'TY REFERENCE-NO 501-500024AA 518185A BOTTOM COVER ASS'Y 838-602604BL 611110 SCREW (M)2.6X4 BLK(BH)

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